Battery cell, battery device, and electric device

Abstract

The present disclosure relates to the technical field of batteries. Disclosed are a battery cell, a battery assembly, and an electric device. The battery cell comprises a housing, a first electrode terminal and a second electrode terminal, an electrode assembly, and a first insulating member. The housing comprises a first wall. The first electrode terminal and the second electrode terminal are disposed on the first wall and are spaced apart in a first direction. The first insulating member covers at least part of an outer surface of the first wall. The first wall has a first edge and a second edge that are opposite each other in the first direction, and the first insulating member is provided with a first hollowed-out region and a second hollowed-out region, such that a first exposed region is formed on the outer surface of the first wall corresponding to the first hollowed-out region, and a second exposed region is formed on the outer surface of the first wall corresponding to the second hollowed-out region. In the first direction, the first exposed region and the second exposed region are respectively located on two sides of the centerline of the first wall in the first direction. An electric device comprising the battery cell has a relatively high energy density.

Description

Battery cells, battery packs and electrical devices Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery cell, battery device, and power consumption device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] Improving the energy density of battery devices is a pressing issue in battery technology. Summary of the Invention

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device that can improve the energy density of the battery device.

[0005] In a first aspect, this application provides a battery cell, which includes a casing, a first electrode terminal and a second electrode terminal, an electrode assembly, and a first insulating member. The casing includes a first wall. The first electrode terminal and the second electrode terminal are disposed on the first wall and arranged at intervals along a first direction. The electrode assembly is housed within the casing. The first insulating member covers at least a portion of the outer surface of the first wall. The first insulating member has a first hollow area and a second hollow area. The outer surface of the first wall forms a first exposed area at a position corresponding to the first hollow area and a second exposed area at a position corresponding to the second hollow area. The first exposed area and the second exposed area are respectively located on both sides of the centerline of the first wall in the first direction.

[0006] In the technical solution of this application embodiment, during the assembly of the battery device, if the first electrode terminal of one of two adjacent battery cells is to be located on the same side of a first direction as the second electrode terminal of the other, since the first exposed area and the second exposed area are respectively located on both sides of the centerline of the first wall in the first direction, the first sampling member and the second sampling member corresponding to these two adjacent battery cells can be connected to the first exposed area of ​​one and the second exposed area of ​​the other, respectively, thereby making the first sampling member and the second sampling member located on the same side of the battery device in the first direction. With this arrangement, the first sampling member and the second sampling member can share some space, thereby improving the energy density of the battery device.

[0007] In one or more embodiments of the first aspect, the first insulating member is provided with a third hollow area and a fourth hollow area, which are respectively located on both sides of the center line. A first electrode terminal passes through the third hollow area, and a second electrode terminal passes through the fourth hollow area. Along the first direction, the first hollow area is located between the third hollow area and the center line, and the second hollow area is located between the fourth hollow area and the center line.

[0008] In the above scheme, the cooperation between the third hollow area and the first electrode terminal, and the cooperation between the second electrode terminal and the fourth hollow area, can position the assembly of the first insulating component, reducing the assembly difficulty of the first insulating component. Since the first hollow area is located between the third hollow area and the center line along the first direction, and the second hollow area is located between the fourth hollow area and the center line, the sampling component can utilize the space formed by the spaced first and second electrode terminals in the thickness direction of the first wall, which is beneficial to improving the energy density of the battery device.

[0009] In one or more embodiments of the first aspect, the first wall has a first edge and a second edge disposed opposite to each other in a first direction; along the first direction, the distance between the first exposed area and the first edge is L1, and the distance between the second exposed area and the second edge is L2, satisfying: |L2-L1|≤1mm.

[0010] In the above scheme, during the assembly of the battery device, if the first electrode terminal of one of two adjacent battery cells is to be located on the same side of the first direction as the second electrode terminal of the other, since the absolute value of the difference between the distance between the first exposed area and the first edge and the distance between the second exposed area and the second edge along the first direction is less than or equal to 1 mm, the first sampling element and the second sampling element corresponding to these two adjacent battery cells can be connected to the first exposed area of ​​one of the two adjacent battery cells and the second exposed area of ​​the other adjacent battery cell, respectively, and the first sampling element and the second sampling element can be arranged approximately in a straight line. This layout can further improve the energy density of the battery device.

[0011] In one or more embodiments of the first aspect, the first exposed area and the second exposed area are symmetrical about the center line.

[0012] In the above scheme, since the first exposed area and the second exposed area are symmetrical about the center, the design and processing difficulty of the first exposed area and the second exposed area is reduced, and the information deviation of different battery cells collected by the sampling component is smaller, thereby improving the accuracy of information collection of different battery cells in the battery device.

[0013] In one or more embodiments of the first aspect, the first wall has a first edge and a second edge disposed opposite to each other in a first direction, and along the first direction, the distance between the first exposed area and the first edge is less than the distance between the first exposed area and the second edge, and the distance between the second exposed area and the second edge is less than the distance between the second exposed area and the first edge.

[0014] In the above scheme, since the distance between the first exposed area and the first edge is less than the distance between the first exposed area and the second edge along the first direction, and the distance between the second exposed area and the second edge is less than the distance between the second exposed area and the first edge, when the two sampling components of the battery device corresponding to two adjacent battery cells need to be arranged eccentrically, the two sampling components can also be located on the same side of the battery device in the first direction, thereby enabling the battery cells to have high versatility and adaptability when corresponding to different battery devices.

[0015] In one or more embodiments of the first aspect, the first wall has a third edge and a fourth edge disposed opposite to each other in the second direction, and the second direction, the first direction and the thickness direction of the first wall are perpendicular to each other; along the second direction, the distance between the first exposed area and the third edge is L3, and the distance between the second exposed area and the fourth edge is L4, satisfying: |L4-L3|≤1mm.

[0016] In the above scheme, since the absolute value of the difference between the distance between the first exposed area and the third edge and the distance between the second exposed area and the fourth edge along the second direction is less than or equal to 1 mm, when two adjacent sampling elements along the second direction are located on the same side of the battery device in the first direction, the spacing between the two adjacent sampling elements along the second direction can be made basically consistent. This setting can make the information deviation of different battery cells collected by the sampling elements smaller, thereby improving the accuracy of information collection of different battery cells in the battery device.

[0017] In one or more embodiments of the first aspect, along the second direction, the distance between the first exposed area and the fourth edge is L5, satisfying: |L5-L3|≤1mm.

[0018] In the above scheme, since the sterilization value of the difference between the distance between the first exposed area and the fourth edge and the distance between the first exposed area and the third edge along the second direction is less than or equal to 1 mm, the information collection of the sampling piece has a small deviation for a single battery cell, thus improving the accuracy of information collection of different battery cells in the battery device.

[0019] In one or more embodiments of the first aspect, the first insulating member is provided with a fifth hollow area, and the outer surface of the first wall forms a third exposed area at the position corresponding to the fifth hollow area. The third exposed area is provided with a marking part, which is used to record information of the battery cell.

[0020] In the above solution, the marking section can record information about individual battery cells, facilitating quality monitoring and promoting automated assembly. Because the marking section is located in the third exposed area, it allows users or equipment to easily access battery cell information while ensuring high insulation performance.

[0021] In one or more embodiments of the first aspect, the first wall has a first edge and a second edge disposed opposite to each other in a first direction, and the distance between the third exposed area and the first edge is less than the distance between the third exposed area and the second edge along the first direction.

[0022] In the above scheme, since the distance between the third exposed area and the first edge is less than the distance between the third exposed area and the second edge along the first direction, and the first exposed area and the second exposed area are located on opposite sides of the centerline of the first wall in the first direction, even when the third exposed area is eccentrically arranged, the two sampling elements can be located on the same side of the battery device in the first direction, thereby enabling the battery device to meet different production needs while also possessing a high energy density.

[0023] In one or more embodiments of the first aspect, a marking portion is provided in the first exposed area or the second exposed area, the marking portion being used to record information of the battery cell.

[0024] In the above scheme, since the first exposed area or the second exposed area is provided with a marking part, the marking part can be exposed through the first exposed area or the second exposed area. At the same time, the sampling component can also be connected to the first exposed area or the second exposed area. The sampling component and the marking part share a single exposed area, which is beneficial to improving the energy density of the battery device. At the same time, it also simplifies the processing flow of the first insulating component.

[0025] In one or more embodiments of the first aspect, the identification part is a barcode or a QR code.

[0026] In the above scheme, barcodes or QR codes can record more information while occupying less space, which helps to reduce the exposed area of ​​battery cells and enable battery cells to have higher insulation performance.

[0027] In one or more embodiments of the first aspect, the housing further includes a second wall and a sidewall, wherein the second wall is disposed opposite to the first wall along the thickness direction of the first wall, and the sidewall surrounds the first wall and the second wall. The battery cell further includes a second insulating member covering at least a portion of the outer surface of the second wall and at least a portion of the outer surface of the sidewall.

[0028] In the above solution, by setting the first insulating member to cover the first wall and the second insulating member to cover the side wall and the second wall, the first insulating member and the second insulating member are respectively set to correspond to the first wall of the outer shell and the second wall and the side wall of the outer shell, which helps to reduce the assembly difficulty between the first insulating member and the second insulating member and the outer shell.

[0029] In one or more embodiments of the first aspect, the first wall has adjacent first edges and third edges. The second insulating member includes a main body portion, a first flange portion and a second flange portion, the main body portion covering the outer surface of the sidewall, the first flange portion and the second flange portion being disposed on the outer surface of the first wall, the first flange portion being disposed along the first edge, the second flange portion being disposed along the third edge, and the first insulating member covering at least a portion of the first flange portion and at least a portion of the second flange portion.

[0030] In the above solution, by covering at least a portion of the first flange and at least a portion of the second flange with the first insulating member, the risk of insulation failure of the battery cell due to the lifting of the first flange and / or the second flange can be reduced, which is beneficial to improving the reliability of the battery cell.

[0031] In one or more embodiments of the first aspect, the second wall and the side wall are integrally formed structures. Along the thickness direction of the first wall, one end of the side wall is connected to the second wall, and the other end is enclosed to form an opening. The first wall is an end cap that closes the opening.

[0032] In the above scheme, since the second wall and the side wall are integrally formed, there are fewer seams between the second wall and the side wall, the assembly difficulty of the second insulating component is lower, and the flatness after assembly is higher.

[0033] Secondly, this application provides a battery device, which includes a battery cell, a busbar, a first sampling element, and a second sampling element as described in one or more embodiments of the first aspect. Multiple battery cells are arranged along a second direction, including adjacent first and second battery cells. The first electrode terminal of the first battery cell and the second electrode terminal of the second battery cell are located on the same side of the first direction. The busbar is used to electrically connect the first electrode terminal of the first battery cell and the second electrode terminal of the second battery cell. The first sampling element is at least partially disposed in a first hollow area of ​​the first battery cell and connected to a first exposed area of ​​the first battery cell. The second sampling element is at least partially disposed in a second hollow area of ​​the second battery cell and connected to a second exposed area of ​​the second battery cell.

[0034] In the above scheme, since the first exposed area and the second exposed area are located on opposite sides of the centerline of the first wall in the first direction, the first sampling element corresponding to the first battery cell and the second sampling element corresponding to the second battery cell can be connected to the first exposed area of ​​the first battery cell and the second exposed area of ​​the second battery cell, respectively, thereby making the first sampling element and the second sampling element located on the same side of the battery device in the first direction. With this arrangement, the first sampling element and the second sampling element can share some space, thereby improving the energy density of the battery device.

[0035] In one or more embodiments of the second aspect, the first battery cell and the second battery cell are alternately arranged along the second direction.

[0036] In the above scheme, even if the first battery cell and the second battery cell are arranged alternately, since the first exposed area and the second exposed area are located on both sides of the center line of the first wall in the first direction, the first sampling element and the second sampling element can also be distributed on the same side of the battery device in the first direction, thereby enabling the battery device to have a high energy density.

[0037] In one or more embodiments of the second aspect, both the first sampling element and the second sampling element are thermistors.

[0038] In the above scheme, the temperature information of the battery cells can be collected by the thermistor, which can provide early warning of thermal runaway of the battery cells or adjust the temperature of the battery cells in a targeted manner to improve the reliability of the battery device during use.

[0039] In one or more embodiments of the second aspect, the battery cell is a square battery cell, and the surface of the battery cell perpendicular to the second direction is the surface with the largest area in the battery cell.

[0040] In the above scheme, since the battery cells are arranged in the second direction, and the surface of the battery cell perpendicular to the second direction is the largest surface area in the battery cell, it means that the size of the first wall in the first direction is larger than the size of the first wall in the second direction. By setting the first sampling element and the second sampling element on the same side of the battery device in the first direction, the information deviation of the first sampling element and the second sampling element in collecting different battery cells can be significantly reduced.

[0041] Thirdly, this application provides an electrical device that includes a battery cell as described in one or more embodiments of the first aspect or a battery device as described in one or more embodiments of the second aspect, wherein the battery cell or battery device is used to provide electrical energy.

[0042] In the above scheme, since the battery device including the battery cell in one or more embodiments of the first aspect has a high energy density, the power device including the battery cell in one or more embodiments of the first aspect also has a high energy density, or the power device including the battery device in one or more embodiments of the second aspect also has a high energy density.

[0043] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0044] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0045] Figure 1 is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0046] Figure 2 is an exploded view of a battery device according to some embodiments of this application;

[0047] Figure 3 is an exploded view of a battery cell according to some embodiments of this application;

[0048] Figure 4 is an isometric view of a portion of the structure of a battery device according to some embodiments of this application;

[0049] Figure 5 is an isometric view of a battery cell according to some embodiments of this application;

[0050] Figure 6 is an exploded view of a portion of the structure of a battery device according to some embodiments of this application, showing the first insulating member and the second insulating member;

[0051] Figure 7 is a schematic diagram of a portion of the structure of a battery device according to some embodiments of this application, showing the first insulating member and the first wall;

[0052] Figure 8 is a structural schematic diagram of a portion of the battery device according to some embodiments of this application, showing the first insulating member and the first wall;

[0053] Figure 9 is a structural schematic diagram of a portion of the battery device according to some embodiments of this application, showing the first insulating member and the first wall;

[0054] Figure 10 is a schematic diagram of a portion of the structure of a battery device according to some other embodiments of this application, showing the first insulating member and the first wall.

[0055] The reference numerals in the detailed embodiments are as follows:

[0056] 1000 - Vehicle; 200 - Controller; 300 - Motor; 100 - Battery Unit; 11 - Housing; 111 - First Housing; 112 - Second Housing; 12 - Battery Cell; 1201 - First Battery Cell; 1202 - Second Battery Cell; 121 - Housing; 1210 - First Wall; 12101 - First Edge; 12102 - Second Edge; 12103 - First Exposed Area; 12104 - Second Exposed Area; 12105 - Third Edge; 12106 - Fourth Edge; 1213 - Second Wall; 1214 - Side Wall; 1211 - End Cap; 1212 - Housing; 122 - Electrode Assembly ; 123-First electrode terminal; 124-Second electrode terminal; 125-Adapter; 126-Pressure relief mechanism; 13-Bulk assembly; 14-First insulating component; 141-First hollow area; 142-Second hollow area; 143-Fifth hollow area; 144-Third hollow area; 145-Fourth hollow area; 146-Sixth hollow area; 147-Seventh hollow area; 15-Second insulating component; 151-First flange; 152-Second flange; 153-Main body; 16-First sampling component; 17-Second sampling component; 18-Identification component; X-First direction; Y-Second direction; Z-Thickness direction of the first wall. Detailed Implementation

[0057] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0059] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0060] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0061] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0062] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0063] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0064] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0065] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0066] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative current collector.

[0067] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0068] In some embodiments, the separator is a separator membrane. The separator membrane can be any known porous structure separator membrane with good chemical and mechanical stability.

[0069] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0070] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0071] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0072] In some implementations, the electrode assembly is a stacked structure.

[0073] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0074] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0075] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0076] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0077] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0078] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0079] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0080] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0081] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0082] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0083] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0084] The following discussion will primarily focus on rectangular battery cells. It should be understood that the embodiments described below are also applicable in some respects to cylindrical battery cells, pouch cell cells, or blade cell cells.

[0085] The development of battery technology must take into account multiple design factors, such as reliability, cycle life, discharge capacity, charge / discharge rate and other performance parameters. In addition, the energy density of the battery device also needs to be considered.

[0086] Typical battery devices generally include a sampling element used to collect information from individual battery cells, such as temperature and voltage. The outer surface of a typical battery cell is usually insulated to reduce the risk of short circuits due to insulation failure between the cell and other components within the battery device. To improve the accuracy of the information collected by the sampling element, it typically passes through the insulator and comes into contact with the battery cell.

[0087] A typical battery cell includes a positive terminal and a negative terminal spaced apart along a first direction. During the assembly of multiple battery cells to form a battery device, to simplify the series connection between adjacent cells, the positive terminal of one of the two cells to be connected in series and the negative terminal of the other are usually designed on the same side of the battery device along the first direction; that is, adjacent battery cells are centrally symmetrical. When the sampling components corresponding to these battery cells are eccentrically configured (e.g., when the sampling components are all arranged close to the positive terminal), the sampling components corresponding to these two series-connected battery cells will be spaced apart along the first direction. This arrangement of the sampling components occupies more space inside the battery device, which is detrimental to improving the energy density of the battery device.

[0088] In view of this, this application provides a battery cell, which includes a casing, a first electrode terminal and a second electrode terminal, an electrode assembly, and a first insulating member. The casing includes a first wall. The first electrode terminal and the second electrode terminal are disposed on the first wall and arranged at intervals along a first direction. The electrode assembly is housed within the casing. The first insulating member covers at least a portion of the outer surface of the first wall. The first wall has a first edge and a second edge disposed opposite to each other in the first direction. The first insulating member has a first hollow area and a second hollow area. The outer surface of the first wall forms a first exposed area at a position corresponding to the first hollow area, and a second exposed area at a position corresponding to the first hollow area. The first exposed area and the second exposed area are respectively located on both sides of the centerline of the first wall in the first direction. During the assembly of the battery device, if it is desired that the first electrode terminal of one of two adjacent battery cells and the second electrode terminal of the other are located on the same side of the first direction, the first exposed area and the second exposed area are respectively located on both sides of the centerline of the first wall in the first direction. Therefore, the first and second sampling elements corresponding to these two adjacent battery cells can be connected to the first exposed area of ​​one and the second exposed area of ​​the other, respectively, so that the first and second sampling elements are located on the same side of the battery device in the first direction. With this arrangement, the first and second sampling elements can share some space, thereby increasing the energy density of the battery device.

[0089] The technical solutions described in the embodiments of this application are applicable to battery cells, battery devices, and electrical devices using battery devices.

[0090] Electrical devices include, but are not limited to: electric vehicles, electric cars, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0091] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0092] For example, Figure 1 is a structural schematic diagram of a vehicle 1000 according to some embodiments of this application. The vehicle 1000 can be a fuel-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle 1000 may have a motor 300, a controller 200, and a battery device 100 installed inside. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be installed at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000. For example, the battery device 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000. In another embodiment of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle 1000.

[0093] To meet different power demands, the battery device 100 may include multiple battery cells 12, which can be connected in series, parallel, or a combination thereof. The battery device 100 may also be referred to as a battery pack. Optionally, the multiple battery cells 12 can first be connected in series, parallel, or a combination thereof to form a battery cell assembly, and then the battery cell assemblies can be connected in series, parallel, or a combination thereof to form the battery device 100. In other words, the multiple battery cells 12 can directly form the battery device 100, or they can first be assembled into battery cell assemblies, and then the battery cell assemblies can be assembled into the battery device 100.

[0094] For example, please refer to Figure 2, which is an exploded view of a battery device 100 according to some embodiments of this application. The battery device 100 may include a plurality of battery cells 12. The battery device 100 may also include a housing 11, which has a hollow internal structure, and the plurality of battery cells 12 are housed within the housing 11. As shown in Figure 2, these are referred to here as a first housing 111 and a second housing 112, which are fastened together. The shapes of the first housing 111 and the second housing 112 can be determined according to the shape of the combination of the plurality of battery cells 12. Both the first housing 111 and the second housing 112 may have an open surface. For example, both the first housing 111 and the second housing 112 may be hollow cuboids with only one open surface each. The open surfaces of the first housing 111 and the second housing 112 are arranged opposite to each other, and the first housing 111 and the second housing 112 are fastened together to form a housing 11 with a closed cavity. Multiple battery cells 12 are connected in parallel, series, or mixed and placed inside the housing 11 formed by the first housing 111 and the second housing 112 being fastened together.

[0095] Optionally, the battery device 100 may also include other structures, which will not be described in detail here. For example, the battery device 100 may also include a busbar component 13, which is used to realize electrical connection between multiple battery cells 12, such as parallel, series, or mixed connection. Specifically, the busbar component 13 can realize electrical connection between battery cells 12 by connecting the electrode terminals of the battery cells 12. Further, the busbar component 13 can be fixed to the electrode terminals of the battery cells 12 by welding. The electrical energy of the multiple battery cells 12 can be further led out through the housing 11 through a conductive mechanism.

[0096] The number of battery cells 12 can be set to any value depending on different power requirements. Multiple battery cells 12 can be connected in series, parallel, or mixed connection to achieve a larger capacity or power. Since each battery device 100 may include a large number of battery cells 12, for ease of installation, the battery cells 12 can be grouped, with each group of battery cells 12 forming a battery cell assembly. The number of battery cells 12 included in a battery cell assembly is unlimited and can be set according to requirements. The battery device 100 may include multiple battery cell assemblies, which can be connected in series, parallel, or mixed connection.

[0097] Please refer to Figure 3, which is an exploded view of a battery cell 12 according to some embodiments of this application. The battery cell 12 includes one or more electrode assemblies 122 and a housing 121. The housing 121 may include a shell 1212, and multiple walls of the shell 1212 form a cavity that can be used to accommodate the electrode assemblies 122. The shape of the shell 1212 depends on the combined shape of the one or more electrode assemblies 122. For example, the shell 1212 may be a hollow cuboid, cube, or regular polyhedron, and one face of the shell 1212 has an opening so that one or more electrode assemblies 122 can be placed inside the shell 1212. The shell 1212 is filled with an electrolyte, such as an electrolyte solution.

[0098] The battery cell 12 may also include two electrode terminals, which can be disposed on an end cap 1211. The end cap 1211 is typically flat, and the two electrode terminals are fixed to the flat surface of the end cap 1211. The two electrode terminals are respectively a positive electrode terminal and a negative electrode terminal. Each electrode terminal is provided with a corresponding adapter 125, which is located between the end cap 1211 and the electrode assembly 122, for electrically connecting the electrode assembly 122 and the electrode terminal. In this battery cell 12, depending on actual usage requirements, the electrode assembly 122 can be configured as a single unit or multiple units, and multiple independent electrode assemblies 122 are disposed within the battery cell 12.

[0099] According to some embodiments of this application, referring to Figures 4-7, this application provides a battery cell 12. The battery cell 12 includes a housing 121, a first electrode terminal 123 and a second electrode terminal 124, an electrode assembly 122, and a first insulating member 14. The housing 121 includes a first wall 1210. The first electrode terminal 123 and the second electrode terminal 124 are disposed on the first wall 1210 and arranged at intervals along a first direction X. The electrode assembly 122 is accommodated within the housing 121. The first insulating member 14 covers at least a portion of the outer surface of the first wall 1210. The first insulating member 14 is provided with a first hollow area 141 and a second hollow area 142. The outer surface of the first wall 1210 forms a first exposed area 12103 at a position corresponding to the first hollow area 141, and a second exposed area 12104 at a position corresponding to the second hollow area 142. The first exposed area 12103 and the second exposed area 12104 are respectively located on both sides of the centerline a in the first direction X of the first wall 1210.

[0100] In some embodiments, the first electrode terminal 123 and the second electrode terminal 124 have opposite polarities; for example, the first electrode terminal 123 is the positive terminal and the second electrode terminal 124 is the negative terminal.

[0101] The material of the first insulating element 14 may include, but is not limited to, rubber or silicone.

[0102] The first insulating element 14 can be connected to the outer surface of the first wall 1210 by means of bonding or hot-melt connection.

[0103] In some embodiments, the housing 121 may include an end cap 1211 and a housing 1212, the housing 1212 having an opening and the end cap 1211 closing the opening. The first wall 1210 may be the end cap 1211 or any wall portion of the housing 1212.

[0104] In some embodiments, the first hollow area 141 is formed by a through hole through which the first insulating member 14 extends along its thickness direction.

[0105] In some embodiments, the second hollow area 142 is formed by a through hole through which the first insulating member 14 extends along its thickness direction.

[0106] In some embodiments, the housing 121 further includes a second wall 1213 and a side wall 1214. Along the thickness direction Z of the first wall, the second wall 1213 is disposed opposite to the first wall 1210, and the side wall 1214 surrounds the first wall 1210 and the second wall 1213. The battery cell 12 also includes a second insulating member 15, which covers at least a portion of the outer surface of the second wall 1213 and at least a portion of the outer surface of the side wall 1214. The first wall 1210 has adjacent first edges 12101 and third edges 12105. The second insulating member 15 includes a main body 153, a first flange 151, and a second flange 152. The main body 153 covers the outer surface of the side wall 1214. The first flange 151 and the second flange 152 are disposed on the outer surface of the first wall 1210. The first flange 151 is disposed along the first edge 12101, and the second flange 152 is disposed along the third edge 12105. The first insulating member 14 covers at least a portion of the first flange 151 and at least a portion of the second flange 152. The first hollow area 141 can be formed by the first insulating member 14 and the first flange 151 and / or the second flange. The second hollow area 142 can be formed by the first insulating member 14 and the first flange 151 and / or the second flange. With this arrangement, the stress distribution of the first insulating member 14 is more uniform, and the risk of excessive deformation is lower.

[0107] The first exposed area 12103 is the area where the first wall 1210 is exposed by the first hollow area 141 when viewed along the thickness direction Z of the first wall.

[0108] The second exposed area 12104 is the area where the first wall 1210 is exposed from the first hollow area 141 when viewed along the thickness direction Z of the first wall.

[0109] In some embodiments, the first cutout area 141 is connected to the second cutout area 142.

[0110] In some embodiments, the battery cell 12 further includes a pressure relief mechanism 126, which is used to release the internal pressure of the battery cell 12 when the internal pressure or temperature of the battery cell 12 reaches a predetermined value. The pressure relief mechanism 126 may be disposed on any wall of the housing 121.

[0111] Optionally, the pressure relief mechanism 126 is disposed on the first wall 1210, and the first insulating member 14 is provided with a sixth hollow area 146. In the same projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the pressure relief mechanism 126 is located within the sixth hollow area 146. The first hollow area 141 communicates with the sixth hollow area 146, and / or, the second hollow area 142 communicates with the sixth hollow area 146.

[0112] Optionally, the sixth cutout area 146 is spaced apart from the first cutout area 141, and the sixth cutout area 146 is spaced apart from the second cutout area 142.

[0113] For example, the pressure relief mechanism 126 may be a pressure relief component such as an explosion-proof valve, an explosion-proof disc, a gas valve, a pressure relief valve, or a safety valve.

[0114] For example, the pressure relief mechanism 126 may also refer to the first wall 1210 with grooves.

[0115] In some embodiments, the housing 121 is made of metal, such as copper, iron, aluminum, steel, or aluminum alloy.

[0116] In some embodiments, the shape of the first cutout area 141 may include, but is not limited to, polygons, circles, semicircles, ellipses, etc.

[0117] In some embodiments, the shape of the second cutout area 142 may include, but is not limited to, polygons, circles, semicircles, ellipses, etc.

[0118] In some embodiments, the first cutout area 141 is symmetrical about the symmetry line b. The first wall 1210 has a third edge 12105 and a fourth edge 12106 disposed opposite to each other along the second direction Y, and the distance between the symmetry line b and the third edge 12105 and the distance between the symmetry line b and the fourth edge 12106 are equal.

[0119] In some embodiments, the second cutout area 142 is symmetrical about the symmetry line b. The first wall 1210 has a third edge 12105 and a fourth edge 12106 disposed opposite to each other along the second direction Y, and the distance between the symmetry line b and the third edge 12105 and the distance between the symmetry line b and the fourth edge 12106 are equal.

[0120] In some embodiments, along the first direction X, the first cutout area 141 is located on the side of the first electrode terminal 123 away from the second electrode terminal 124, and the second cutout area 142 is located on the side of the second electrode terminal 124 away from the first electrode terminal 123.

[0121] In some embodiments, along the first direction X, the minimum distance between the first insulating member 14 and the first edge 12101 is less than the minimum distance between the first insulating member 14 and the second edge 12102.

[0122] Along the first direction X, the distance between the first exposed area 12103 and the first edge 12101 can be understood as the minimum distance between the first exposed area 12103 and the first edge 12101 along the first direction X, or it can be understood as the distance between the center of the circumcircle of the first exposed area 12103 and the first edge 12101 along the first direction X.

[0123] Along the first direction X, the distance between the second exposed area 12104 and the second edge 12102 can be understood as the minimum distance between the second exposed area 12104 and the second edge 12102 along the first direction X, or it can be understood as the distance between the center of the circumcircle of the second exposed area 12104 and the second edge 12102 along the first direction X.

[0124] In some embodiments, the first insulating member 14 is provided with a third hollow area 144 and a fourth hollow area 145, which are located on both sides of the center line a. A first electrode terminal 123 passes through the third hollow area 144, and a second electrode terminal 124 passes through the fourth hollow area 145. Along the first direction X, the third hollow area 144 is located between the first hollow area 141 and the center line a, and the fourth hollow area 145 is located between the second hollow area 142 and the center line a.

[0125] The centerline a of the first wall 1210 in the first direction X is equidistant from the first edge 12101 and the second edge 12102. The term "equidistant" in this document refers to distances within the allowable error range, and will not be elaborated further below. In some embodiments, the first wall 1210 is an end cap 1211, and the centerline a is the centerline along the length of the end cap 1211.

[0126] Along the first direction X, a portion of the first exposed area 12103 and a portion of the second exposed area 12104 are located on both sides of the centerline a of the first wall 1210 in the first direction X. It can also be understood that the first exposed area 12103 and the second exposed area 12104 are located on both sides of the centerline a of the first wall 1210 in the first direction X.

[0127] Referring to Figures 4 and 7-9, along the first direction X, the first exposed area 12103 and the second exposed area 12104 are located on both sides of the centerline a of the first wall 1210 in the first direction X. This means that during the assembly of the battery device 100, when the first electrode terminal 123 of one of two adjacent battery cells 12 and the second electrode terminal 124 of the other are located on the same side of the first direction X, the first sampling element 16 and the second sampling element 17 corresponding to these two adjacent battery cells 12 can be connected to the first exposed area 12103 of one and the second exposed area 12104 of the other, respectively, so that the first sampling element 16 and the second sampling element 17 are located on the same side of the battery device 100 in the first direction X (as shown in Figure 4). That is, the first sampling element 16 and the second sampling element 17 can share some space, which is beneficial to improving the energy density of the battery cell 12. For example, the saved space can be used to arrange components such as circuit boards, making the battery device 100 more compact and with a higher energy density.

[0128] In the above scheme, since the first exposed area 12103 and the second exposed area 12104 are located on both sides of the centerline a of the first wall 1210 in the first direction X, the first sampling element 16 and the second sampling element 17 corresponding to the two adjacent battery cells 12 can be connected to the first exposed area 12103 of one and the second exposed area 12104 of the other, respectively, so that the first sampling element 16 and the second sampling element 17 are located on the same side of the battery device 100 in the first direction X. With this arrangement, the first sampling element 16 and the second sampling element 17 can share part of the space, thereby improving the energy density of the battery device 100.

[0129] Furthermore, after the battery cells 12 are grouped into the box, since the first exposed area 12103 and the second exposed area 12104 are located on both sides of the center line a of the first wall 1210 in the first direction X, the first sampling component 16 and the second sampling component 17 can be assembled on the same side of the battery device 100 along the first direction X, which reduces the assembly difficulty of the sampling components and is conducive to the automated production of the battery device 100.

[0130] According to some embodiments of this application, referring to Figures 4-7, the first insulating member 14 is provided with a third hollow area 144 and a fourth hollow area 145, which are located on both sides of the center line a. A first electrode terminal 123 passes through the third hollow area 144, and a second electrode terminal 124 passes through the fourth hollow area 145. Along the first direction X, the first hollow area 141 is located between the third hollow area 144 and the center line a, and the second hollow area 142 is located between the fourth hollow area 145 and the center line a.

[0131] In some embodiments, the first electrode terminal 123 is a positive terminal and the second electrode terminal 124 is a negative terminal. The resistivity of the first electrode terminal 123 is greater than that of the negative terminal of the second electrode terminal 124. For example, the first electrode terminal 123 is made of aluminum and the second electrode terminal 124 is made of copper. Along the first direction X, the size of the first electrode terminal 123 is larger than the size of the second electrode terminal 124. Along the first direction X, the size of the third cutout area 144 is larger than the size of the fourth cutout area 145. Of course, in some other embodiments, along the first direction X, the size of the third cutout area 144 may be equal to the size of the fourth cutout area 145.

[0132] In some embodiments, the first electrode terminal 123 and / or the second electrode terminal 124 may be copper-aluminum composite electrode terminals.

[0133] In some embodiments, the third hollow area 144 is formed by a through hole through which the first insulating member 14 extends along its thickness direction.

[0134] In some embodiments, the fourth hollow area 145 is formed by a through hole through which the first insulating member 14 extends along its thickness direction.

[0135] In some embodiments, the housing 121 further includes a second wall 1213 and a side wall 1214. Along the thickness direction Z of the first wall, the second wall 1213 is disposed opposite to the first wall 1210, and the side wall 1214 surrounds the first wall 1210 and the second wall 1213. The battery cell 12 also includes a second insulating member 15, which covers at least a portion of the outer surface of the second wall 1213 and at least a portion of the outer surface of the side wall 1214. The first wall 1210 has adjacent first edges 12101 and third edges 12105. The second insulating member 15 includes a main body 153, a first flange 151, and a second flange 152. The main body 153 covers the outer surface of the side wall 1214. The first flange 151 and the second flange 152 are disposed on the outer surface of the first wall 1210. The first flange 151 is disposed along the first edge 12101, and the second flange 152 is disposed along the third edge 12105. The first insulating member 14 covers at least a portion of the first flange 151 and at least a portion of the second flange 152. The third hollow area 144 can be formed by the edge of the first insulating member 14 enclosing the first flange 151 and / or the second flange. The fourth hollow area 145 can be formed by the edge of the first insulating member 14 enclosing the first flange 151 and / or the second flange. With this arrangement, the stress distribution of the first insulating member 14 is more uniform, and the risk of excessive deformation is lower.

[0136] In some embodiments, along the first direction X, the first cutout area 141 and the third cutout area 144 are spaced apart, the second cutout area 142 and the third cutout area 144 are spaced apart, the first cutout area 141 and the fourth cutout area 145 are spaced apart, and the second cutout area 142 and the fourth cutout area 145 are spaced apart.

[0137] Along the first direction X, the first cutout area 141 is located between the third cutout area 144 and the center line a, and the second cutout area 142 is located between the fourth cutout area 145 and the center line a. This means that after the sampling element is connected to the first wall 1210, along the first direction X, at least a portion of the sampling element is located between the first electrode terminal 123 and the second electrode terminal 124.

[0138] In the above scheme, the cooperation between the third hollow area 144 and the first electrode terminal 123, and the cooperation between the second electrode terminal 124 and the fourth hollow area 145, can position the assembly of the first insulating member 14, reducing the assembly difficulty of the first insulating member 14. Since the first hollow area 141 is located between the third hollow area 144 and the center line a along the first direction X, and the second hollow area 142 is located between the fourth hollow area 145 and the center line a, the sampling element can utilize the space formed by the spaced first electrode terminals 123 and second electrode terminals 124 in the thickness direction of the first wall 1210, which is beneficial to improving the energy density of the battery device 100.

[0139] According to some embodiments of this application, please refer to Figures 4-7. The first wall 1210 has a first edge 12101 and a second edge 12102 disposed opposite to each other in the first direction X. Along the first direction X, the distance between the first exposed area 12103 and the first edge 12101 is L1, and the distance between the second exposed area 12104 and the second edge 12102 is L2, satisfying: |L2-L1|≤1mm.

[0140] Along the first direction X, the absolute value of the difference between the distance between the first exposed area 12103 and the first edge 12101 and the distance between the second exposed area 12104 and the second edge 12102 can be any value less than or equal to 1 mm, such as any point value or a range between any two of the following: 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm.

[0141] Along the first direction X, the absolute value of the difference between the distance between the first exposed area 12103 and the first edge 12101 and the distance between the second exposed area 12104 and the second edge 12102 is less than or equal to 1 mm. This can also be understood as the distance between the first exposed area 12103 and the first edge 12101 and the distance between the second exposed area 12104 and the second edge 12102 being equal along the first direction X.

[0142] In the above scheme, during the assembly of the battery device 100, if the first electrode terminal 123 of one of two adjacent battery cells 12 is to be located on the same side of the first direction as the second electrode terminal 124 of the other, since the absolute value of the difference between the distance between the first exposed area 12103 and the first edge 12101 and the distance between the second exposed area 12104 and the second edge 12102 along the first direction X is less than or equal to 1 mm, the first sampling element and the second sampling element corresponding to the two adjacent battery cells 12 can be connected to the first exposed area of ​​one of them and the second exposed area of ​​the other, respectively, and the first sampling element 16 and the second sampling element 17 can be arranged approximately in a straight line. This layout can further improve the energy density of the battery device 100.

[0143] According to some embodiments of this application, please refer to Figures 4-7 and Figure 9, the first exposed area 12103 and the second exposed area 12104 are symmetrical about the center line a.

[0144] The first exposed area 12103 and the second exposed area 12104 are symmetrical about the center line a, which means that after adjacent battery cells 12 are stacked, the position of the sampling device relative to the first wall 1210 on different battery cells 12 is basically the same.

[0145] In the above scheme, since the first exposed area 12103 and the second exposed area 12104 are symmetrical about the center, the design and processing difficulty of the first exposed area 12103 and the second exposed area 12104 is reduced, and the information deviation of different battery cells 12 collected by the sampling component is smaller, thereby improving the accuracy of information collection of different battery cells 12 in the battery device 100.

[0146] According to some embodiments of this application, please refer to Figures 4-10. The first wall 1210 has a first edge 12101 and a second edge 12102 disposed opposite to each other in the first direction X. Along the first direction X, the distance between the first exposed area 12103 and the first edge 12101 is less than the distance between the first exposed area 12103 and the second edge 12102, and the distance between the second exposed area 12104 and the second edge 12102 is less than the distance between the second exposed area 12104 and the first edge 12101.

[0147] In some embodiments, referring to FIG9, the first wall 1210 has a third edge 12105 and a fourth edge 12106 disposed opposite to each other in the second direction Y, and the second direction Y, the first direction X and the thickness direction Z of the first wall are perpendicular to each other; along the second direction Y, the distance between the first exposed area 12103 and the third edge 12105 is greater than the distance between the second exposed area 12104 and the fourth edge 12106.

[0148] The distance between the first exposed area 12103 and the first edge 12101 is less than the distance between the first exposed area 12103 and the second edge 12102, and the distance between the second exposed area 12104 and the second edge 12102 is less than the distance between the second exposed area 12104 and the first edge 12101. This means that the first exposed area 12103 is eccentrically positioned in the first direction X, and the second exposed area 12104 is eccentrically positioned in the first direction X. The first exposed area 12103 and the second exposed area 12104 are located on both sides of the center line of the battery cell 12 in the first direction X. For example, referring to Figures 6-9, the first exposed area 12103 and the second exposed area 12104 are located on both sides of the center line a of the battery cell 12 in the first direction X.

[0149] In the above scheme, since the distance between the first exposed area 12103 and the first edge 12101 is less than the distance between the first exposed area 12103 and the second edge 12102 along the first direction X, and the distance between the second exposed area 12104 and the second edge 12102 is less than the distance between the second exposed area 12104 and the first edge 12101, when the two sampling elements of the battery device 100 corresponding to two adjacent battery cells 12 need to be arranged eccentrically, the two sampling elements can also be located on the same side of the battery device 100 in the first direction X, thereby enabling the battery cells 12 to have high versatility and adaptability when corresponding to different battery devices 100.

[0150] According to some embodiments of this application, please refer to Figures 4-8. The first wall 1210 has a third edge 12105 and a fourth edge 12106 disposed opposite to each other in the second direction Y. The second direction Y, the first direction X and the thickness direction Z of the first wall are perpendicular to each other. Along the second direction Y, the distance between the first exposed area 12103 and the third edge 12105 is L3, and the distance between the second exposed area 12104 and the fourth edge 12106 is L4, satisfying: |L4-L3|≤1mm.

[0151] Along the second direction Y, the absolute value of the difference between the distance between the first exposed area 12103 and the third edge 12105 and the distance between the second exposed area 12104 and the fourth edge 12106 can be any value less than or equal to 1 mm, such as any point value or a range between any two of the following: 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm.

[0152] Along the second direction Y, the absolute value of the difference between the distance between the first exposed area 12103 and the third edge 12105 and the distance between the second exposed area 12104 and the fourth edge 12106 is less than or equal to 1 mm. This can also be understood as the distance between the first exposed area 12103 and the third edge 12105 and the distance between the second exposed area 12104 and the fourth edge 12106 being equal in the second direction Y.

[0153] Along the second direction Y, the distance between the first exposed area 12103 and the third edge 12105 can be understood as the minimum distance between the first exposed area 12103 and the third edge 12105 along the second direction Y, or it can be understood as the distance between the center of the circumcircle of the first exposed area 12103 and the third edge 12105 along the second direction Y.

[0154] Along the second direction Y, the distance between the second exposed area 12104 and the fourth edge 12106 can be understood as the minimum distance between the second exposed area 12104 and the fourth edge 12106 along the second direction Y, or it can be understood as the distance between the center of the circumcircle of the second exposed area 12104 and the fourth edge 12106 along the second direction Y.

[0155] In the above scheme, since the absolute value of the difference between the distance between the first exposed area 12103 and the third edge 12105 and the distance between the second exposed area 12104 and the fourth edge 12106 along the second direction Y is less than or equal to 1 mm, when two adjacent sampling elements along the second direction Y are located on the same side of the battery device 100 in the first direction X, the spacing between the two adjacent sampling elements along the second direction Y can be made basically consistent. This setting can make the information deviation of different battery cells 12 collected by the sampling elements smaller, thereby improving the accuracy of information collection of different battery cells 12 in the battery device 100.

[0156] According to some embodiments of this application, please refer to Figures 4-7. Along the second direction Y, the distance between the first exposed area and the fourth edge is L5, which satisfies: |L5-L3|≤1mm.

[0157] Along the second direction Y, the absolute value of the difference between the distance between the first exposed area 12103 and the fourth edge 12106 and the distance between the first exposed area 12103 and the third edge 12105 can be any value less than or equal to 1 mm, such as any point value or a range between any two of the following: 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm.

[0158] Along the second direction Y, the absolute value of the difference between the distance between the first exposed area 12103 and the fourth edge 12106 and the distance between the first exposed area 12103 and the third edge 12105 is less than or equal to 1 mm. This can also be understood as the distance between the first exposed area 12103 and the fourth edge 12106 and the distance between the first exposed area 12103 and the third edge 12105 being equal in the second direction Y.

[0159] In the above scheme, since the sterilization value of the difference between the distance between the first exposed area 12103 and the fourth edge 12106 and the distance between the first exposed area 12103 and the third edge 12105 along the second direction Y is less than or equal to 1 mm, the information collection of the sampling element has a small deviation from the single battery cell 12, thus improving the accuracy of information collection of different battery cells 12 in the battery device 100.

[0160] According to some embodiments of this application, please refer to Figures 4-7. The first insulating member 14 is provided with a fifth hollow area 143. The outer surface of the first wall 1210 forms a third exposed area at the position corresponding to the fifth hollow area 143. The third exposed area is provided with a marking part 18, which is used to record information of the battery cell 12.

[0161] In some embodiments, the fifth hollow area 143 is formed by a through hole through which the first insulating member 14 extends along its thickness direction.

[0162] In some embodiments, the housing 121 further includes a second wall 1213 and a side wall 1214. Along the thickness direction Z of the first wall, the second wall 1213 is disposed opposite to the first wall 1210, and the side wall 1214 surrounds the first wall 1210 and the second wall 1213. The battery cell 12 also includes a second insulating member 15, which covers at least a portion of the outer surface of the second wall 1213 and at least a portion of the outer surface of the side wall 1214. The first wall 1210 has adjacent first edges 12101 and third edges 12105. The second insulating member 15 includes a main body 153, a first flange 151, and a second flange 152. The main body 153 covers the outer surface of the side wall 1214. The first flange 151 and the second flange 152 are disposed on the outer surface of the first wall 1210. The first flange 151 is disposed along the first edge 12101, and the second flange 152 is disposed along the third edge 12105. The first insulating member 14 covers at least a portion of the first flange 151 and at least a portion of the second flange 152. The fifth hollow area 143 can be formed by the first insulating member 14 and the first flange 151 and / or the second flange. With this arrangement, the stress distribution of the first insulating member 14 is more uniform, and the risk of excessive deformation is lower.

[0163] The marking unit 18 can be used for quality traceability. For example, by identifying the marking unit 18, information such as the production date, production batch, and manufacturer of the battery cell 12 can be obtained. For example, after the battery cell 12 is processed and before it is assembled into the housing 11 of the battery assembly 100, the marking unit 18 can be used to confirm whether the battery cell 12 corresponds to the battery assembly 100. In addition, the marking unit 18 also facilitates the automation of the assembly of the battery assembly 100.

[0164] In some embodiments, the marking portion 18 may be etched onto the outer surface of the first wall 1210.

[0165] In some embodiments, the battery cell 12 further includes a pressure relief mechanism 126. Optionally, the pressure relief mechanism 126 is disposed on the first wall 1210, and the first insulating member 14 has a sixth hollow area 146. In the same projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the pressure relief mechanism 126 is located within the sixth hollow area 146. The fifth hollow area 143 communicates with the sixth hollow area 146. Optionally, the sixth hollow area 146 and the fifth hollow area 143 are spaced apart.

[0166] In the above scheme, the marking unit 18 can record information about the battery cell 12, which facilitates quality monitoring of the battery cell 12 and is beneficial for the automated assembly of the battery cell 12. Since the marking unit 18 is located in the third exposed area, it allows users or equipment to easily obtain information about the battery cell 12 while ensuring that the battery cell 12 has high insulation performance.

[0167] According to some embodiments of this application, please refer to Figures 4-7. The first wall 1210 has a first edge 12101 and a second edge 12102 disposed opposite to each other in the first direction X. Along the first direction X, the distance between the third exposed area and the first edge 12101 is less than the distance between the third exposed area and the second edge 12102.

[0168] Along the first direction X, the distance between the third exposed area and the first edge 12101 is less than the distance between the third exposed area and the second edge 12102, which means that the third exposed area is eccentrically set in the first direction X. For example, referring to Figures 6-9, the third exposed area is located on one side of the center line a of the battery cell 12 in the first direction X.

[0169] In the above scheme, since the distance between the third exposed area and the first edge 12101 along the first direction X is less than the distance between the third exposed area and the second edge 12102, and the first exposed area 12103 and the second exposed area 12104 are located on both sides of the centerline a of the first wall 1210 in the first direction X, the two sampling elements can be located on the same side of the battery device 100 in the first direction X when the third exposed area is eccentrically arranged, thereby enabling the battery device 100 to have a high energy density while meeting different production needs.

[0170] According to some embodiments of this application, please refer to FIG10, a marking portion 18 is provided in the first exposed area 12103 or the second exposed area 12104, and the marking portion 18 is used to record information of the battery cell 12.

[0171] The marking portion 18 is provided in the first exposed area 12103 or the second exposed area 12104, which means that the marking portion 18 can be exposed before the sampling component is assembled, in addition to allowing the sampling component to be connected to the first wall 1210.

[0172] In the above scheme, since the first exposed area 12103 or the second exposed area 12104 is provided with the marking part 18, the marking part 18 can be exposed from the first exposed area 12103 or the second exposed area 12104. At the same time, the sampling component can also be connected to the first exposed area 12103 or the second exposed area 12104. The sampling component and the marking part 18 share a single exposed area, which is beneficial to improving the energy density of the battery device 100. At the same time, it also simplifies the processing flow of the first insulating component 14.

[0173] According to some embodiments of this application, the identification part 18 is a barcode or a QR code.

[0174] In the above scheme, barcodes or QR codes can record more information while occupying less space, which helps to reduce the exposed area of ​​the battery cell 12 and enable the battery cell 12 to have higher insulation performance.

[0175] According to some embodiments of this application, referring to Figures 4-6, the outer casing 121 further includes a second wall 1213 and a side wall 1214. Along the thickness direction Z of the first wall, the second wall 1213 is disposed opposite to the first wall 1210, and the side wall 1214 surrounds the first wall 1210 and the second wall 1213. The battery cell 12 further includes a second insulating member 15, which covers at least a portion of the outer surface of the second wall 1213 and at least a portion of the outer surface of the side wall 1214.

[0176] In some embodiments, the material of the second insulating member 15 may include, but is not limited to, rubber or silicone.

[0177] The second insulating element 15 can be connected to the outer surface of the second wall 1213 and the side wall 1214 by means of bonding or hot-melt connection.

[0178] In the above solution, by setting the first insulating member 14 to cover the first wall 1210 and the second insulating member 15 to cover the side wall 1214 and the second wall 1213, the first insulating member 14 and the second insulating member 15 are respectively corresponding to the first wall 1210 of the outer shell 121 and the second wall 1213 and the side wall 1214 of the outer shell 121, which helps to reduce the assembly difficulty between the first insulating member 14 and the second insulating member 15 and the outer shell 121.

[0179] According to some embodiments of this application, referring to Figures 4-6, the first wall 1210 has adjacent first edges 12101 and third edges 12105. The second insulating member 15 includes a main body 153, a first flange 151, and a second flange 152. The main body 153 covers the outer surface of the side wall 1214. The first flange 151 and the second flange 152 are disposed on the outer surface of the first wall 1210. The first flange 151 is disposed along the first edge 12101, and the second flange 152 is disposed along the third edge 12105. The first insulating member 14 covers at least a portion of the first flange 151 and at least a portion of the second flange 152.

[0180] The first wall 1210 has an adjacent first edge 12101 and a second edge 12102, which means that the first edge 12101 and the second edge 12102 are not two parallel edges, but have an intersection point or a partial intersection point.

[0181] The main body 153, the first flange 151, and the second flange 152 can be integrally formed or separately formed. Any two of them can be integrally formed or separately formed.

[0182] The first insulating member 14 covers at least a portion of the first flange 151 and at least a portion of the second flange 152, which means that the risk of the first flange 151 and / or the second flange 152 lifting is low, and the risk of insufficient electrical clearance between the battery cell 12 and the rest of the battery device 100 is low.

[0183] In some embodiments, the first flange 151 and the second flange 152 form an overlapping area at the corner of the first edge 12101 and the second edge 12102, and the first insulating member 14 covers the overlapping area. Since the overlapping area has a high risk of warping, the first insulating member 14 covering the overlapping area can significantly reduce the risk of insulation failure of the battery cell 12 due to warping of the first flange 151 and / or the second flange 152. This is beneficial for improving the reliability of the battery cell 12.

[0184] In some embodiments, the first flange 151 has a first side away from the main body 153, and the second flange 152 has a second side away from the main body 153. The first insulating member 14 covers the first and second sides. By covering the first and second sides with the first insulating member 14, most of the first flange 151 and the second flange 152 can be covered by the first insulating member 14, which can further reduce the risk of the first flange 151 and / or the second flange 152 lifting, and is beneficial to further improve the reliability of the battery cell 12.

[0185] In some embodiments, the sidewall 1214 includes two third walls disposed opposite each other along a first direction X and two fourth walls disposed opposite each other along a second direction Y. The third walls connect the first wall 1210 and the second wall 1213, and the fourth walls connect the first wall 1210 and the second wall 1213. The outer surface of the fourth wall is the surface with the largest area in the battery cell 12. The main body 153 includes a first part and a second part. The first part covers at least a portion of the third wall, and the second part covers at least a portion of the fourth wall. The first part is provided with a seventh hollow area 147. The outer surface of the third wall forms a seventh exposed area at the position corresponding to the seventh hollow area 147. The seventh exposed area is used to connect with the housing 11 component. The housing 11 component can be a wall of the housing 11 or a panel surrounding the battery cell assembly.

[0186] In the above solution, by covering at least a portion of the first flange 151 and at least a portion of the second flange 152 with the first insulating member 14, the risk of insulation failure of the battery cell 12 due to the lifting of the first flange 151 and / or the second flange 152 can be reduced, which is beneficial to improving the reliability of the battery cell 12.

[0187] According to some embodiments of this application, please refer to Figures 4-6. The second wall 1213 and the side wall 1214 are integrally formed structures. Along the thickness direction Z of the first wall, one end of the side wall 1214 is connected to the second wall 1213, and the other end is enclosed to form an opening. The first wall 1210 is an end cap 1211 that closes the opening.

[0188] The second wall 1213 and the side wall 1214 enclose a hollow structure with one end open in the thickness direction Z of the first wall, and the first wall 1210 covers the opening to form a housing 121 for accommodating the electrode assembly 122.

[0189] The second wall 1213 and the side wall 1214 are integrally formed structures, that is, the second wall 1213 and the side wall 1214 of the outer shell 121 are made by integral forming process, such as stamping or casting.

[0190] In the above scheme, since the second wall 1213 and the side wall 1214 are integrally formed, there are fewer seams between the second wall 1213 and the side wall 1214, the assembly difficulty of the second insulating component 15 is lower, and the flatness after assembly is higher.

[0191] According to some embodiments of this application, referring to Figures 4-7, this application provides a battery device 100. The battery device 100 includes a battery cell 12, a busbar 13, a first sampling element 16, and a second sampling element 17 as described in one or more of the above embodiments. Multiple battery cells 12 are arranged along a second direction Y. Each battery cell 12 includes adjacent first battery cells 1201 and second battery cells 1202. The first electrode terminal 123 of the first battery cell 1201 and the second electrode terminal 124 of the second battery cell 1202 are located on the same side in the first direction X. The busbar 13 is used to electrically connect the first electrode terminal 123 of the first battery cell 1201 and the second electrode terminal 124 of the second battery cell 1202. The first sampling element 16 is at least partially disposed in the first hollow area 141 of the first battery cell 1201 and connected to the first exposed area 12103 of the first battery cell 1201. The second sampling element 17 is at least partially disposed in the second hollow area 142 of the second battery cell 1202 and connected to the second exposed area 12104 of the second battery cell 1202.

[0192] In some embodiments, multiple battery cells 12 can be connected in series via a busbar 13.

[0193] In some embodiments, multiple battery cells 12 can be connected in series via a busbar 13.

[0194] The first electrode terminal 123 of the first battery cell 1201 and the second electrode terminal 124 of the second battery cell 1202 are located on the same side in the first direction X. The busbar 13 is used to electrically connect the first electrode terminal 123 of the first battery cell 1201 and the second electrode terminal 124 of the second battery cell 1202. Referring to Figure 4, this means that when the first battery cell 1201 and the second battery cell 1202 are connected in series, the busbar 13 can extend along the second direction Y. The busbar 13 occupies less space, is easier to arrange, and has a lower risk of interference with other components of the battery device 100 (e.g., pressure relief mechanism 126, sampling element, etc.) during assembly.

[0195] In some embodiments, the battery device 100 further includes a circuit board and a battery management system. One end of the sampling device is electrically connected to the circuit board, and the other end is connected to the first wall 1210. The circuit board is electrically connected to the battery management system. The information collected by the sampling device from the battery cells 12 is transmitted to the battery management system, which processes the information.

[0196] Alternatively, the circuit board can be a flexible circuit board.

[0197] In some embodiments, the sampling element can be a voltage sampling element, such as a voltage sampling resistor. It can also be a temperature sampling element, such as a thermistor or thermocouple.

[0198] In some embodiments, the sampling element may also refer to a conductive element, such as a nickel sheet, used to connect the battery cell 12 to the sampling circuit. One end of the conductive element is connected to the first wall 1210, and the other end of the conductive element is electrically connected to the sampling circuit.

[0199] In the above scheme, since the first exposed area 12103 and the second exposed area 12104 are located on both sides of the centerline a of the first wall 1210 in the first direction X, the first sampling element 16 corresponding to the first battery cell 1201 and the second sampling element 17 corresponding to the second battery cell 1202 can be connected to the first exposed area 12103 of the first battery cell 1201 and the second exposed area 12104 of the second battery cell 1202, respectively, so that the first sampling element 16 and the second sampling element 17 are located on the same side of the battery device 100 in the first direction X. With this layout, the first sampling element 16 and the second sampling element 17 can share part of the space, thereby improving the energy density of the battery device 100.

[0200] According to some embodiments of this application, please refer to Figures 4-7, along the second direction Y, the first battery cell 1201 and the second battery cell 1202 are alternately arranged.

[0201] Along the second direction Y, the first battery cell 1201 and the second battery cell 1202 are alternately arranged. This means that adjacent battery cells 12 in the plurality of battery cells 12 are arranged in a centrally symmetrical manner. It can also be understood that in the battery cell assembly composed of the plurality of battery cells 12, all battery cells 12 are connected in series through the busbar 13.

[0202] In the above scheme, even if the first battery cell 1201 and the second battery cell 1202 are arranged alternately, since the first exposed area 12103 and the second exposed area 12104 are located on both sides of the center line a of the first wall 1210 in the first direction X, the first sampling element 16 and the second sampling element 17 can also be distributed on the same side of the battery device 100 in the first direction X, thereby enabling the battery device 100 to have a higher energy density.

[0203] According to some embodiments of this application, please refer to Figures 4-7. The first sampling element 16 and the second sampling element 17 are both thermistors.

[0204] In the above scheme, the temperature information of the battery cell 12 can be collected by the thermistor, so as to provide early warning of thermal runaway of the battery cell 12 or to adjust the temperature of the battery cell 12 in a targeted manner, thereby improving the reliability of the battery device 100 during use.

[0205] According to some embodiments of this application, please refer to Figures 4-7. The battery cell 12 is a square battery cell 12, and the surface of the battery cell 12 perpendicular to the second direction Y is the surface with the largest area in the battery cell 12.

[0206] Since the battery cells 12 are arranged in the second direction Y, and the surface of the battery cell 12 perpendicular to the second direction Y is the largest surface area among the battery cells 12, it means that the size of the first wall 1210 in the first direction X is larger than the size of the first wall 1210 in the second direction Y. Therefore, the information difference between different positions of the first wall 1210 in the first direction X is large, such as temperature information. By setting the first sampling element 16 and the second sampling element 17 on the same side of the battery device 100 in the first direction X in a linear arrangement, the reference corresponding to the information of different battery cells 12 collected can be basically consistent, which has high reference value.

[0207] In the above scheme, the first sampling element 16 and the second sampling element 17 are set on the same side of the battery device 100 in the first direction X, which can significantly reduce the information deviation of the first sampling element 16 and the second sampling element 17 in collecting different battery cells 12.

[0208] According to some embodiments of this application, please refer to FIG1, this application provides an electrical device, which includes a battery cell 12 or a battery device 100 in one or more of the above embodiments, wherein the battery cell 12 or the battery device 100 is used to provide electrical energy.

[0209] In the above scheme, since the battery device 100 including the battery cell 12 in one or more of the above embodiments has a high energy density, the power device including the battery cell 12 in one or more of the above embodiments also has a high energy density, or the power device including the battery device 100 in one or more of the above embodiments also has a high energy density.

[0210] According to some embodiments of this application, referring to Figures 4-7, this application provides a battery cell 12. The battery cell 12 includes a housing 121, a first electrode terminal 123 and a second electrode terminal 124, an electrode assembly 122, and a first insulating member 14. The housing 121 includes an end cap 1211. The first electrode terminal 123 and the second electrode terminal 124 are disposed on the end cap 1211 and arranged at intervals along a first direction X. The electrode assembly 122 is accommodated within the housing 121. The first insulating member 14 covers at least a portion of the outer surface of the end cap 1211. The end cap 1211 has a first edge 12101 and a second edge 12102 disposed opposite to each other in the first direction X. The first insulating member 14 is provided with a first hollow area 141 and a second hollow area 142. A first exposed area 12103 is formed on the outer surface of the end cap 1211 at the position corresponding to the first hollow area 141, and a second exposed area 12104 is formed on the outer surface of the end cap 1211 at the position corresponding to the first hollow area 141. The first exposed area 12103 and the second exposed area 12104 are located on both sides of the centerline a in the first direction X of the first wall 1210. The distance between the first exposed area 12103 and the first edge 12101 is less than the distance between the first exposed area 12103 and the second edge 12102, and the distance between the second exposed area 12104 and the second edge 12102 is less than the distance between the second exposed area 12104 and the first edge 12101. The end cap 1211 has a third edge 12105 and a fourth edge 12106 disposed opposite to each other in the second direction Y. The second direction Y, the first direction X, and the thickness direction of the end cap 1211 are perpendicular to each other. Along the second direction Y, the distance between the first exposed area 12103 and the third edge 12105 is equal to the distance between the second exposed area 12104 and the fourth edge 12106. The distance between the first exposed area 12103 and the third edge 12105 is equal to the distance between the first exposed area 12103 and the fourth edge 12106. The first insulating member 14 is provided with a fifth hollow area 143. The outer surface of the end cap 1211 forms a third exposed area at the position corresponding to the fifth hollow area 143. The third exposed area is provided with a marking portion 18 for recording information about the battery cell 12. Along the first direction X, the distance between the third exposed area and the first edge 12101 is less than the distance between the third exposed area and the second edge 12102. The first insulating member 14 is provided with a third hollow area 144 and a fourth hollow area 145. The first electrode terminal 123 passes through the third hollow area 144, and the second electrode terminal 124 passes through the fourth hollow area 145. Along the first direction X, both the first hollow area 141 and the second hollow area 142 are located between the third hollow area 144 and the fourth hollow area 145.

[0211] The housing 121 also includes a second wall 1213 and a side wall 1214. Along the thickness direction of the end cap 1211, the second wall 1213 is disposed opposite to the end cap 1211, and the side wall 1214 surrounds the end cap 1211 and the second wall 1213. The battery cell 12 also includes a second insulating member 15, which covers at least a portion of the outer surface of the second wall 1213 and at least a portion of the outer surface of the side wall 1214. The end cap 1211 has adjacent first edges 12101 and third edges 12105. The second insulating member 15 includes a main body 153, a first flange 151, and a second flange 152. The main body 153 covers the outer surface of the side wall 1214. The first flange 151 and the second flange 152 are disposed on the outer surface of the end cap 1211. The first flange 151 is disposed along the first edge 12101, and the second flange 152 is disposed along the third edge 12105. The first insulating member 14 covers at least a portion of the first flange 151 and at least a portion of the second flange 152.

[0212] According to some embodiments of this application, referring to Figures 4-7, this application provides a battery device 100. The battery device 100 includes a battery cell 12, a busbar component 13, a first sampling element 16, and a second sampling element 17. Multiple battery cells 12 are provided, arranged along a second direction Y. Each battery cell 12 includes adjacent first battery cells 1201 and second battery cells 1202, which are alternately arranged along the second direction Y. The battery cell 12 is a square battery cell 12, and the surface of the battery cell 12 perpendicular to the second direction Y is the surface with the largest area among the battery cells 12. The battery cell 12 includes a housing 121, a first electrode terminal 123 and a second electrode terminal 124, an electrode assembly 122, and a first insulating element 14. The housing 121 includes an end cap 1211. The first electrode terminal 123 and the second electrode terminal 124 are disposed on the end cap 1211 and arranged at intervals along the first direction X. The electrode assembly 122 is housed within the housing 121. The first insulating member 14 covers at least a portion of the outer surface of the end cap 1211. The end cap 1211 has a first edge 12101 and a second edge 12102 disposed opposite each other in a first direction X. The first insulating member 14 has a first hollow area 141 and a second hollow area 142. A first exposed area 12103 is formed on the outer surface of the end cap 1211 at a position corresponding to the first hollow area 141, and a second exposed area 12104 is formed on the outer surface of the end cap 1211 at a position corresponding to the first hollow area 141. Along the first direction X, the distance between the first exposed area 12103 and the first edge 12101 is equal to the distance between the second exposed area 12104 and the second edge 12102. The distance between the first exposed area 12103 and the first edge 12101 is less than the distance between the first exposed area 12103 and the second edge 12102, and the distance between the second exposed area 12104 and the second edge 12102 is less than the distance between the second exposed area 12104 and the first edge 12101. The end cap 1211 has a third edge 12105 and a fourth edge 12106 disposed opposite each other in the second direction Y. The second direction Y, the first direction X, and the thickness direction of the end cap 1211 are perpendicular to each other. Along the second direction Y, the distance between the first exposed area 12103 and the third edge 12105 is equal to the distance between the second exposed area 12104 and the fourth edge 12106. The first insulating member 14 is provided with a fifth hollow area 143. The outer surface of the end cap 1211 forms a third exposed area at the position corresponding to the fifth hollow area 143. The third exposed area is provided with a marking part 18, which is used to record information of the battery cell 12. Along the first direction X, the distance between the third exposed area and the first edge 12101 is less than the distance between the third exposed area and the second edge 12102.The first insulating member 14 is provided with a third hollow area 144 and a fourth hollow area 145. A first electrode terminal 123 passes through the third hollow area 144, and a second electrode terminal 124 passes through the fourth hollow area 145. Along the first direction X, the first hollow area 141 and the second hollow area 142 are both located between the third hollow area 144 and the fourth hollow area 145. The outer casing 121 also includes a second wall 1213 and a side wall 1214. Along the thickness direction of the end cap 1211, the second wall 1213 is disposed opposite to the end cap 1211, and the side wall 1214 surrounds the end cap 1211 and the second wall 1213. The battery cell 12 also includes a second insulating member 15, which covers at least a portion of the outer surface of the second wall 1213 and at least a portion of the outer surface of the side wall 1214. The end cap 1211 has adjacent first edges 12101 and third edges 12105. The second insulating member 15 includes a main body 153, a first flange 151, and a second flange 152. The main body 153 covers the outer surface of the side wall 1214. The first flange 151 and the second flange 152 are disposed on the outer surface of the end cap 1211. The first flange 151 is disposed along the first edge 12101, and the second flange 152 is disposed along the third edge 12105. The first insulating member 14 covers at least a portion of the first flange 151 and at least a portion of the second flange 152.

[0213] The first electrode terminal 123 of the first battery cell 1201 and the second electrode terminal 124 of the second battery cell 1202 are located on the same side in the first direction X. The busbar 13 is used to electrically connect the first electrode terminal 123 of the first battery cell 1201 and the second electrode terminal 124 of the second battery cell 1202. A first sampling element 16 is at least partially disposed in the first hollow area 141 of the first battery cell 1201 and connected to the first exposed area 12103 of the first battery cell 1201. A second sampling element 17 is at least partially disposed in the second hollow area 142 of the second battery cell 1202 and connected to the second exposed area 12104 of the second battery cell 1202. Both the first sampling element 16 and the second sampling element 17 are thermistors.

[0214] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer shell, including the first wall; A first electrode terminal and a second electrode terminal are disposed on the first wall and arranged at intervals along a first direction. Electrode assembly, housed within the housing; A first insulating element covers at least a portion of the outer surface of the first wall; The first insulating member is provided with a first hollow area and a second hollow area, the outer surface of the first wall forms a first exposed area at the position corresponding to the first hollow area, and the outer surface of the first wall forms a second exposed area at the position corresponding to the second hollow area. The first exposed area and the second exposed area are located on both sides of the center line of the first wall in the first direction.

2. The battery cell according to claim 1, characterized in that, The first insulating component is provided with a third hollow area and a fourth hollow area, the third hollow area and the fourth hollow area are respectively located on both sides of the center line, the first electrode terminal passes through the third hollow area, and the second electrode terminal passes through the fourth hollow area; Along the first direction, the first hollow area is located between the third hollow area and the center line, and the second hollow area is located between the fourth hollow area and the center line.

3. The battery cell according to claim 1 or 2, characterized in that, The first wall has a first edge and a second edge that are disposed opposite to each other in the first direction; Along the first direction, the distance between the first exposed area and the first edge is L1, and the distance between the second exposed area and the second edge is L2, satisfying: |L2-L1|≤1mm.

4. The battery cell according to any one of claims 1-3, characterized in that, The first exposed area and the second exposed area are symmetrical about the center line.

5. The battery cell according to any one of claims 1-4, characterized in that, The first wall has a first edge and a second edge disposed opposite to each other in the first direction; along the first direction, the distance between the first exposed area and the first edge is less than the distance between the first exposed area and the second edge, and the distance between the second exposed area and the second edge is less than the distance between the second exposed area and the first edge.

6. The battery cell according to any one of claims 1-5, characterized in that, The first wall has a third edge and a fourth edge that are disposed opposite to each other in the second direction, and the second direction, the first direction and the thickness direction of the first wall are perpendicular to each other; Along the second direction, the distance between the first exposed area and the third edge is L3, and the distance between the second exposed area and the fourth edge is L4, satisfying: |L4-L3|≤1mm.

7. The battery cell according to claim 6, characterized in that, Along the second direction, the distance between the first exposed area and the fourth edge is L5, which satisfies: |L5-L3|≤1mm.

8. The battery cell according to any one of claims 1-7, characterized in that, The first insulating member is provided with a fifth hollow area, and the outer surface of the first wall forms a third exposed area at the position corresponding to the fifth hollow area. The third exposed area is provided with a marking part, which is used to record the information of the battery cell.

9. The battery cell according to claim 8, characterized in that, The first wall has a first edge and a second edge disposed opposite to each other in the first direction; along the first direction, the distance between the third exposed area and the first edge is less than the distance between the third exposed area and the second edge.

10. The battery cell according to claim 8 or 9, characterized in that, The first exposed area or the second exposed area is provided with a marking part, which is used to record information of the battery cell.

11. The battery cell according to any one of claims 8-10, characterized in that, The identification part is a barcode or a QR code.

12. The battery cell according to any one of claims 1-11, characterized in that, The outer casing also includes a second wall and a side wall. Along the thickness direction of the first wall, the second wall is disposed opposite to the first wall, and the side wall surrounds the first wall and the second wall. The battery cell further includes a second insulating member, which covers at least a portion of the outer surface of the second wall and at least a portion of the outer surface of the sidewall.

13. The battery cell according to claim 12, characterized in that, The first wall has an adjacent first edge and a third edge; The second insulating member includes a main body, a first flange, and a second flange. The main body covers the outer surface of the sidewall. The first flange and the second flange are disposed on the outer surface of the first wall. The first flange is disposed along the first edge, and the second flange is disposed along the third edge. The first insulating member covers at least a portion of the first flange and at least a portion of the second flange.

14. The battery cell according to claim 12 or 13, characterized in that, The second wall and the side wall are integrally formed. Along the thickness direction of the first wall, one end of the side wall is connected to the second wall, and the other end is enclosed to form an opening. The first wall is an end cap that closes the opening.

15. A battery device, characterized in that, include: The battery cell as described in any one of claims 1-14 is provided in a plurality of battery cells, the plurality of battery cells are arranged along a second direction, the plurality of battery cells include adjacent first battery cells and second battery cells, the first electrode terminal of the first battery cell and the second electrode terminal of the second battery cell are located on the same side of the first direction. A busbar component for electrically connecting the first electrode terminal of the first battery cell to the second electrode terminal of the second battery cell; The first sampling element is at least partially disposed in the first hollow area of ​​the first battery cell and connected to the first exposed area of ​​the first battery cell. The second sampling element is at least partially disposed in the second hollow area of ​​the second battery cell and connected to the second exposed area of ​​the second battery cell.

16. The battery device according to claim 15, characterized in that, Along the second direction, the first battery cell and the second battery cell are alternately arranged.

17. The battery device according to claim 15 or 16, characterized in that, Both the first sampling device and the second sampling device are thermistors.

18. The battery device according to any one of claims 15-17, characterized in that, The battery cell is a square battery cell, and the surface of the battery cell perpendicular to the second direction is the surface with the largest area in the battery cell.

19. An electrical appliance, characterized in that, Includes a battery cell as described in any one of claims 1-14 or a battery device as described in any one of claims 15-18, wherein the battery cell or the battery device is used to provide electrical energy.

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