CN221508430U - Battery monomer, battery and power-consuming device - Google Patents

Abstract

The application discloses a battery monomer, a battery and an electric device. The battery monomer provided by the application comprises a shell, a first pole, a second pole and a sampling assembly, wherein the shell comprises a wall part; the first pole is arranged on the wall part and is provided with a first connecting part; the second pole is arranged on the wall part and is spaced from the first pole in the first direction, and the second pole is provided with a second connecting part; the sampling assembly is located outside the shell and comprises a sampling element, a first lead and a second lead, the first lead is connected with the sampling element and the first connecting portion, the second lead is connected with the sampling element and the second connecting portion, the first connecting portion and the second connecting portion are asymmetrically arranged on a reference plane, and the reference plane is perpendicular to the first direction and passes through the midpoint between the first pole and the second pole. Compared with other types of battery cells, the battery cell sampling element has higher installation efficiency and accuracy.

Description

Battery cell, battery and power-consuming device

Technical Field

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

Background Art

Energy conservation and emission reduction are the key to sustainable development, which has promoted the adjustment of energy structure and the development and application of battery technology. The key to the development of battery technology lies in electrochemical energy storage technology, which has been widely used in portable electronics, electric vehicles and energy storage systems due to its high energy density, good cycle capacity, high operating voltage, environmental protection and low self-discharge.

During use, the battery needs to be sampled and monitored through a sampling module to monitor its working status. However, during the installation of existing sampling modules, there is a risk of confusion between the relative positions of the sampling modules and the positive and negative poles, resulting in low installation efficiency and other problems.

Utility Model Content

The main purpose of the present application is to provide a battery cell, a battery and an electrical device, aiming to solve the above-mentioned technical problems existing in the prior art.

In order to solve the above problems, the present application provides a battery cell, which includes a shell, a first pole, a second pole and a sampling assembly, wherein the shell includes a wall; the first pole is arranged on the wall, and the first pole has a first connection portion; the second pole is arranged on the wall, and the second pole is arranged spaced apart from the first pole in a first direction, and the second pole has a second connection portion; the sampling assembly is located outside the shell, and the sampling assembly includes a sampling element, a first wire and a second wire, the first wire connects the sampling element and the first connection portion, the second wire connects the sampling element and the second connection portion, and the first connection portion and the second connection portion are asymmetrically arranged with a reference plane, and the reference plane is perpendicular to the first direction and passes through the midpoint between the first pole and the second pole. Thus, the first wire of the sampling assembly connects the first connection portion of the first pole, the second wire connects the second connection portion of the second pole, and the first connection portion and the second connection portion are asymmetrically arranged with a reference plane, so that the first pole and the second pole can be easily distinguished through the first connection portion and the second connection portion, and the risk of confusion between the sampling element and the first pole and the second pole is alleviated, thereby improving the installation efficiency and accuracy of the sampling element.

In some embodiments, the first connection portion is located on the side of the first pole facing the second pole, and the second connection portion is located on the side of the second pole in a second direction perpendicular to the first direction. Thus, the difference between the position of the first connection portion on the first pole and the position of the second connection portion on the second pole is increased, which can further alleviate the risk of confusion between the sampling element and the first pole and the second pole, thereby improving the installation efficiency and precision of the sampling element.

In some embodiments, the first wire includes a first wire segment, a second wire segment, and a third wire segment connected in sequence, the first wire segment connects the sampling element, the third wire segment connects the first connection portion, wherein the first wire segment and the third wire segment extend along a first direction, and the second wire segment extends along a direction intersecting the first direction. Thus, the first wire segment and the third wire segment extend along the first direction, which facilitates connecting the sampling element and the first connection portion in the first direction, and can shorten the length of the first wire, and the second wire segment extends along a direction intersecting the first direction, which facilitates the second wire segment to avoid other components outside the housing, thereby alleviating the risk of interference between the first wire and other components.

In some embodiments, the second wire includes a fourth wire segment, a fifth wire segment, a sixth wire segment, and a seventh wire segment connected in sequence, the fourth wire segment connects the sampling element, the seventh wire segment connects the second connection portion, the fourth wire segment and the sixth wire segment extend along the first direction, the fifth wire segment extends along the direction intersecting the first direction, and the seventh wire segment extends along the second direction. Thus, the fourth wire segment and the sixth wire segment extend along the first direction to reduce the length of the second wire, the fifth wire segment extends along the direction intersecting the first direction to avoid other components outside the housing, and reduce the risk of interference between the second wire and other components, and the seventh wire segment extends along the second direction to facilitate the corresponding connection between the seventh wire segment and the second connection portion.

In some embodiments, the sampling assembly further includes a first connector, and the first wire is connected to the sampling element through the first connector; and/or the sampling assembly further includes a second connector, and the second wire is connected to the sampling element through the second connector. Thus, the first wire and the second wire can be connected to the sampling element through the first connector and the second connector, respectively, which improves the reliability of the connection between the first wire and the second wire and the sampling element.

In some embodiments, the end surface of the first pole away from the inside of the housing is recessed to form a first connection portion in the shape of a groove; and/or the end surface of the second pole away from the inside of the housing is recessed to form a second connection portion in the shape of a groove. Thus, the first wire can be inserted into the first connection portion in the shape of a groove, and the second wire can be inserted into the second connection portion in the shape of a groove, thereby improving the stability of the connection between the first wire and the first pole and the second wire and the second pole.

In some embodiments, the sampling element is located between the first pole and the second pole in the first direction. Thus, the extension length of the first wire and the second wire in the first direction can be reduced, production costs can be saved, and the complexity of the wiring harness can be reduced.

In some embodiments, the sampling assembly further comprises an insulating member, which is disposed on the side of the wall away from the interior of the housing, and the sampling element, the first wire and the second wire are disposed on the insulating member. Thus, the insulating member can provide support for the sampling assembly and reduce the risk of short circuit of the sampling assembly through the insulating member.

In some embodiments, the first wire and the second wire are at least partially buried in the insulating member. Thus, the first wire and the second wire can be fixed by the insulating member, and the insulating member can also protect the first wire and the second wire, further reducing the risk of short circuit of the sampling component.

In some embodiments, the insulating member is provided with a first avoidance hole penetrating the two opposite surfaces of the insulating member, the first pole is at least partially disposed in the first avoidance hole, and the first wire extends from the side wall of the first avoidance hole into the first avoidance hole to connect with the first connecting portion; and/or, the insulating member is provided with a second avoidance hole penetrating the two opposite surfaces of the insulating member, the second pole is at least partially disposed in the second avoidance hole, and the second wire extends from the side wall of the second avoidance hole into the second avoidance hole to connect with the second connecting portion. Thus, the first avoidance hole and the second avoidance hole can avoid the first pole and the second pole respectively, alleviating the risk of interference between the insulating member and the first pole and the second pole, thereby improving the stability of the insulating member installed on the wall, and at the same time facilitating the first wire and the second wire buried in the insulating member to be connected to the first pole and the second pole respectively.

In some embodiments, the insulating member is provided with a third avoidance hole penetrating through the surfaces of the two opposite sides of the insulating member, the wall is provided with an explosion-proof valve, the explosion-proof valve is located between the first pole and the second pole, and the third avoidance hole corresponds to the explosion-proof valve. Thus, the explosion-proof valve can release the internal pressure when the internal pressure or temperature of the battery cell reaches a threshold value, thereby improving the safety of the battery cell, and at the same time, the third avoidance hole alleviates the risk of interference between the insulating member and the explosion-proof valve.

In some embodiments, the insulating member is provided with a receiving groove, the sampling element is installed in the receiving groove, and the sampling assembly further comprises a packaging cover plate, which is covered in the notch of the receiving groove. Thus, the receiving groove and the packaging cover plate can provide support and protection for the sampling assembly, alleviate the risk of damage to the sampling assembly, and improve the reliability of the sampling assembly.

In some embodiments, the sampling assembly further includes a data transmission line, which is fixed to the package cover plate and is communicatively connected to the sampling element, thereby facilitating the transmission of the data signal collected by the sampling element through the data transmission line.

In some embodiments, the housing includes a shell and an end cover, the shell is provided with an open end, the end cover is provided on the open end, and the first pole and the second pole are provided on the end cover. Thus, the end cover can cooperate with the shell to isolate the internal environment of the battery cell from the external environment, and at the same time, the first pole and the second pole are provided on the end cover, which can facilitate the installation and fixation of the first pole and the second pole.

In order to solve the above problems, the present application provides a battery, which includes the above battery cell.

In order to solve the above problems, the present application also provides an electrical device, which includes the above battery.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic structural diagram of a vehicle according to one or more embodiments of the present application;

FIG2 is a schematic diagram of an exploded structure of a battery according to one or more embodiments of the present application;

FIG3 is a schematic diagram of an exploded structure of a battery cell according to one or more embodiments of the present application;

FIG4 is a schematic diagram of the structure of a battery cell according to one or more embodiments of the present application;

FIG5 is a first structural schematic diagram of a sampling assembly of a battery cell according to one or more embodiments of the present application;

FIG6 is a second structural schematic diagram of a sampling assembly of a battery cell according to one or more embodiments of the present application;

FIG. 7 is an exploded view of a sampling assembly of a battery cell according to one or more embodiments of the present application.

Figure numbers: vehicle 1; battery 2; controller 3; motor 4; housing 20; first part 21; second part 22; battery cell 10; housing 100; wall 110; explosion-proof valve 111; shell 120; end cover 130; first pole 200; first connecting portion 210; second pole 300; second connecting portion 310; sampling assembly 400; sampling element 410; first wire 420; first line segment 421; second line segment 422; third line segment 423; second wire 430; fourth line segment 431; fifth line segment 432; sixth line segment 433; seventh line segment 434; reference plane 440; first connector 450; second connector 460; insulating member 470; first avoidance hole 471; second avoidance hole 472; third avoidance hole 473; accommodating groove 474; packaging cover plate 480; data transmission line 490; first direction x1; second direction x2.

DETAILED DESCRIPTION

The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

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

Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character "/" in this article generally indicates that the associated objects before and after are in an "or" relationship.

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

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

In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

At present, from the perspective of market development, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of battery application areas, its market demand is also constantly expanding.

Batteries mentioned in this field can be divided into disposable batteries and rechargeable batteries according to whether they are rechargeable or not. Disposable batteries (Primary Battery) are also called "disposable" batteries and original batteries, because after they are exhausted, they can no longer be recharged and can only be discarded. Rechargeable batteries are also called secondary batteries (Secondary Battery) or secondary batteries, storage batteries. The manufacturing materials and processes of rechargeable batteries are different from those of primary batteries. Its advantage is that it can be recycled many times after charging, and the output current load capacity of rechargeable batteries is higher than that of most disposable batteries. The common types of rechargeable batteries at present are: lead-acid batteries, nickel-metal hydride batteries and lithium-ion batteries. Lithium-ion batteries have the advantages of light weight, large capacity (the capacity is 1.5 to 2 times that of nickel-metal hydride batteries of the same weight), no memory effect, and have a very low self-discharge rate. Therefore, even though the price is relatively high, they are still widely used. Lithium-ion batteries are currently also widely used in pure electric vehicles and hybrid vehicles. The capacity of lithium-ion batteries used for this purpose is relatively low, but they have a larger output and charging current, and also have a longer service life, but the cost is higher.

The battery described in the embodiments of the present application refers to a rechargeable battery or a disposable battery. The embodiments disclosed in the present application will be described below mainly by taking a lithium-ion battery as an example. It should be understood that the embodiments disclosed in the present application are applicable to any other appropriate type of rechargeable battery. The battery mentioned in the embodiments disclosed in the present application can be directly or indirectly applied to an appropriate device to power the device.

The present application provides an electric device, which may include but is not limited to mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles and spacecraft, etc. Among them, the electric device may include a battery, and the electric device may provide electric energy through the battery to realize the corresponding function.

The present application also provides an electric vehicle, which may include a battery.

Please refer to FIG. 1 , which is a schematic structural diagram of a vehicle according to one or more embodiments of the present application.

The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 2 is provided inside the vehicle 1, and the battery 2 may be provided at the bottom, the head or the tail of the vehicle 1. The battery 2 may be used to power the vehicle 1, for example, the battery 2 may be used as an operating power source for the vehicle 1. The vehicle 1 may also include a controller 3 and a motor 4, and the controller 3 is used to control the battery 2 to power the motor 4, for example, for starting, navigating and operating power requirements of the vehicle 1 during driving.

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

In order to improve the performance of electrical devices, the present application also provides a battery, see FIG2 , which is a schematic diagram of the exploded structure of a battery according to one or more embodiments of the present application.

The shape of the battery 2 may include but is not limited to a square cylindrical shape or other arbitrary shapes.

In some embodiments, the battery 2 may include a box 20 and a battery cell 10, and the battery cell 10 is accommodated in the box 20. The box 20 is used to provide a storage space for the battery cell 10, and the box 20 may adopt a variety of structures. In some embodiments, the box 20 may include a first part 21 and a second part 22, and the first part 21 and the second part 22 cover each other, and the first part 21 and the second part 22 jointly define a storage space for accommodating the battery cell 10. The second part 22 may be a hollow structure with one end open, and the first part 21 may be a plate-like structure, and the first part 21 covers the open side of the second part 22, so that the first part 21 and the second part 22 jointly define a storage space; the first part 21 and the second part 22 may also be hollow structures with one side open, and the open side of the first part 21 covers the open side of the second part 22.

In the battery 2, there can be multiple battery cells 10, and the multiple battery cells 10 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple battery cells 10 are both connected in series and in parallel. The multiple battery cells 10 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 10 is accommodated in the box 20; of course, the battery 2 can also be a battery module formed by connecting multiple battery cells 10 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 20. The battery 2 can also include other structures, for example, the battery 2 can also include a busbar component for realizing electrical connection between the multiple battery cells 10.

The manufacturing methods of the battery cell 10 include stacking and winding, that is, the battery cell 10 is divided into stacking cells and winding cells. The stacking battery has a uniform current collection effect, a small internal resistance of the battery, and a large specific power, but in order to improve the precision, the mold precision is extremely high, the equipment investment is high, and the process is relatively complex, and the production efficiency is low. The winding battery is simple to make, and the equipment precision requirements for the production and assembly process are general, the production efficiency is high, and the cost is low. In terms of performance, the winding battery has excellent high and low temperature performance, charges very quickly, has an ultra-long life, a stable high output voltage, a solid structure, and strong shock resistance.

Referring to FIG. 3 , FIG. 3 is a schematic diagram of an exploded structure of a battery cell according to one or more embodiments of the present application.

The battery cell 10 refers to the smallest unit constituting the battery 2 . The battery cell 10 may include a housing 100 , an electrode assembly, and other functional components. The housing 100 includes an end cap 130 and a shell 120 .

The end cap 130 refers to a component that covers the opening of the shell 120 to isolate the internal environment of the battery cell 10 from the external environment. Without limitation, the shape of the end cap 130 can be adapted to the shape of the shell 120 to match the shell 120. Optionally, the end cap 130 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 130 is not easily deformed when it is squeezed and collided, so that the battery cell 10 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals can be provided on the end cap 130. The electrode terminal can be used to electrically connect to the electrode assembly for outputting or inputting electrical energy of the battery cell 10. In some embodiments, the electrode terminal may include a pole. The pole may include a positive pole and a negative pole for outputting current and connecting to an external circuit. In some embodiments, the end cap 130 may also be provided with an explosion-proof component for releasing the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold. The material of the end cap 130 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the present embodiment. In some embodiments, an insulating member can be provided inside the end cap 130, and the insulating member can be used to isolate the electrical connection components in the housing 120 from the end cap 130 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

The shell 120 is a component used to cooperate with the end cap 130 to form the internal environment of the battery cell 10, wherein the formed internal environment can be used to accommodate the electrode assembly, electrolyte and other components. The shell 120 and the end cap 130 can be independent components, and an opening can be set on the shell 120, and the internal environment of the battery cell 10 is formed by covering the opening with the end cap 130 at the opening. Without limitation, the end cap 130 and the shell 120 can also be integrated. Specifically, the end cap 130 and the shell 120 can form a common connection surface before other components are put into the shell, and when the interior of the shell 120 needs to be encapsulated, the end cap 130 covers the shell 120. The shell 120 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 120 can be determined according to the specific shape and size of the electrode assembly. The material of the shell 120 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

The electrode assembly is a component in the battery cell 10 where electrochemical reactions occur. One or more electrode assemblies may be included in the housing 120. The electrode assembly is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

In some embodiments, the electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell 10, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing the active ions to pass through.

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

As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate, a composite material of lithium iron phosphate and carbon, lithium manganese phosphate, a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, at least one of lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, and their modified compounds.

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

As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The foamed metal may be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

As an example, the negative electrode sheet may include a negative electrode collector and a negative electrode active material disposed on at least one surface of the negative electrode collector.

As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

As an example, the negative electrode active material may adopt the negative electrode active material for the battery cell 10 known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes.

In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

In some embodiments, the battery cell 10 further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

The liquid electrolyte includes an electrolyte salt and a solvent.

In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be selected from ether solvents. Ether solvents can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, and the like.

As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

Among them, the battery cell 10 needs to sample and monitor the working status of the battery through a sampling module during use. However, during the installation of the existing sampling module, there is a risk of confusion between the relative positions of the sampling module and the positive and negative poles, resulting in low installation efficiency and other problems.

Referring to Figures 4-7, Figure 4 is a schematic diagram of the structure of a battery cell according to one or more embodiments of the present application; Figure 5 is a first schematic diagram of the structure of a sampling assembly of a battery cell according to one or more embodiments of the present application; Figure 6 is a second schematic diagram of the structure of a sampling assembly of a battery cell according to one or more embodiments of the present application; and Figure 7 is an exploded view of a sampling assembly of a battery cell according to one or more embodiments of the present application.

The present application provides a battery cell 10, The battery cell 10 includes a shell 100, a first pole 200, a second pole 300 and a sampling assembly 400. The shell 100 includes a wall 110. The first pole 200 is arranged on the wall 110, and the first pole 200 has a first connection portion 210. The second pole 300 is arranged on the wall 110, and the second pole 300 is spaced apart from the first pole 200 in the first direction x1, and the second pole 300 has a second connection portion 310. The sampling assembly 400 is located outside the shell 100, and the sampling assembly 400 includes a sampling element 410, a first wire 420 and a second wire 430. The first wire 420 connects the sampling element 410 and the first connection portion 210, and the second wire 430 connects the sampling element 410 and the second connection portion 310. The first connection portion 210 and the second connection portion 310 are asymmetrically arranged with a reference plane 440. The reference plane 440 is perpendicular to the first direction x1 and passes through the midpoint between the first pole 200 and the second pole 300.

The housing 100 can be used as a carrier of the sampling assembly 400 so that the sampling assembly 400 is directly or indirectly relatively fixed to the housing 100. The housing 100 can isolate the internal environment of the battery cell 10 from the external environment. The housing 100 can have a certain hardness and strength, so that the housing 100 is not easily deformed when squeezed and collided, thereby improving the safety performance of the battery cell 10. The housing 100 can be in any shape. For example, the shape of the housing 100 includes but is not limited to square, cylindrical, prismatic, etc. The housing 100 can be an internal hollow structure, and the interior of the housing 100 can be used to accommodate objects such as electrode assemblies and electrolytes. The housing 100 includes a wall 110, and the wall 110 can be any side wall of the housing 100. For example, when the housing 100 is square, the parts corresponding to the six sides of the square housing 100 can all be used as the wall 110 of this embodiment.

The first pole 200 and the second pole 300 are arranged on the wall 110, wherein the first pole 200 can be any one of a positive pole and a negative pole, and the second pole 300 is the other of the positive pole and the negative pole. For example, when the first pole 200 is a positive pole, the second pole 300 can be a negative pole; or when the first pole 200 is a negative pole, the second pole 300 can be a positive pole. The first pole 200 has a first connecting portion 210, and the second pole 300 has a second connecting portion 310. The first connecting portion 210 and the second connecting portion 310 are respectively used to connect with the first wire 420 and the second wire 430 of the sampling assembly 400.

The sampling component 400 includes a sampling element 410, a first wire 420 and a second wire 430. The sampling element 410 may refer to a device for collecting the status signal of the battery cell 10, that is, a device that can receive the status signal on the battery cell 10 and has the functions of storing and processing the status signal. Among them, the status signal refers to the status information displayed on the battery cell 10, such as the temperature signal, voltage signal, pressure signal, etc. on the battery cell 10. The sampling element 410 can be connected to the first pole 200 and the second pole 300 respectively through the first wire 420 and the second wire 430, and collect the status information inside the battery cell 10, so as to monitor the working state of the battery cell 10. The first wire 420 and the second wire 430 can transmit the status signal on the battery cell 10 to the sampling element 410 in the form of current or voltage.

The first connection portion 210 and the second connection portion 310 are asymmetrically arranged with respect to a reference plane 440, and the reference plane 440 is perpendicular to the first direction x1 and passes through the midpoint between the first pole 200 and the second pole 300. Exemplarily, with the reference plane 440 as the symmetry plane, the mirror image of the first connection portion 210 on the other side of the symmetry plane is different from the second connection portion 310, wherein the mirror image of the first connection portion 210 is different from the second connection portion 310 may mean that the mirror image of the first connection portion 210 is different from the second connection portion 310 in at least one of shape and position, for example, the mirror image of the first connection portion 210 may be the same in shape as the second connection portion 310 but in a different position, that is, the mirror image of the first connection portion 210 does not overlap with the second connection portion 310; or the mirror image of the first connection portion 210 may be different in shape from the second connection portion 310 but in the same position; or the mirror image of the first connection portion 210 is different in shape and position from the second connection portion 310. It is understandable that the first connection part 210 and the second connection part 310 are arranged asymmetrically with respect to the reference plane 440, so that the operator can accurately connect the sampling element 410 to the first pole 200 and the second pole 300 in a conductive manner. Exemplarily, the sampling element 410 can be accurately connected to the first pole 200 and the second pole 300 in a conductive manner, including but not limited to the shape of the first wire 420 does not match the shape of the second connection part 310, the first wire 420 cannot correspond to the position of the second connection part 310 when mirror-mounted, the shape of the second wire 430 does not match the shape of the first connection part 210, and the second wire 430 cannot correspond to the position of the first connection part 210 when mirror-mounted, etc. Therefore, the operator can easily distinguish the first pole 200 and the second pole 300 through the first connection part 210 and the second connection part 310, and reduce the risk of confusion in the connection between the sampling element 410 and the first pole 200 and the second pole 300.

Through the above embodiment, the first wire 420 of the sampling component 400 is connected to the first connection portion 210 of the first pole 200, and the second wire 430 is connected to the second connection portion 310 of the second pole 300. The first connection portion 210 and the second connection portion 310 are asymmetrically arranged with respect to the reference plane 440. The first pole 200 and the second pole 300 can be easily distinguished through the first connection portion 210 and the second connection portion 310, thereby alleviating the risk of connection confusion between the sampling element 410 and the first pole 200 and the second pole 300, thereby improving the installation efficiency and accuracy of the sampling element 410.

In some embodiments, the housing 100 includes a shell 120 and an end cap 130, the shell 120 is provided with an open end, the end cap 130 is covered at the open end, and the first pole 200 and the second pole 300 are provided on the end cap 130. The end cap 130 refers to a component that covers the opening of the shell 120 to isolate the internal environment of the battery cell 10 from the external environment. Without limitation, the shape of the end cap 130 can be adapted to the shape of the shell 120 to match the shell 120. Optionally, the end cap 130 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 130 is not easily deformed when it is squeezed and collided, so that the battery cell 10 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals can be provided on the end cap 130. The electrode terminal can be used to electrically connect to the electrode assembly for outputting or inputting the electrical energy of the battery cell 10. In some embodiments, the electrode terminal can include a pole. The poles may include positive poles and negative poles for output of current and connection with external circuits. The material of the end cap 130 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. The shell 120 is a component used to cooperate with the end cap 130 to form the internal environment of the battery cell 10, wherein the formed internal environment can be used to accommodate the electrode assembly, electrolyte and other components. The shell 120 and the end cap 130 can be independent components, and an opening can be set on the shell 120, and the end cap 130 is closed at the opening to form the internal environment of the battery cell 10. Without limitation, the end cap 130 and the shell 120 can also be integrated. Specifically, the end cap 130 and the shell 120 can form a common connection surface before other components are put into the shell, and when the interior of the shell 120 needs to be encapsulated, the end cap 130 is closed to the shell 120. The shell 120 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 120 can be determined according to the specific shape and size of the electrode assembly. The shell 120 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. Thus, the end cover 130 can cooperate with the shell 120 to isolate the internal environment of the battery cell 10 from the external environment. At the same time, the first pole 200 and the second pole 300 are arranged on the end cover 130, which can facilitate the installation and fixation of the first pole 200 and the second pole 300.

In some embodiments, the first connection portion 210 is located on the side of the first pole 200 facing the second pole 300, and the second connection portion 310 is located on the side of the second pole 300 in the second direction x2 perpendicular to the first direction x1. It can be understood that, with the reference plane 440 as the symmetry plane, the mirror image of the first connection portion 210 on the other side of the symmetry plane can be located on the side of the second pole 300 facing the first pole 200, which is offset from the position of the second connection portion 310. Similarly, the mirror image of the second connection portion 310 on the other side of the symmetry plane is located on the side of the first pole 200 in the second direction x2, which is offset from the position of the first connection portion 210. This further reduces the risk that the first wire 420 can be connected to the second connection portion 310 and the second wire 430 can be connected to the first connection portion 210 in correspondence during incorrect installation. Thus, the difference between the position of the first connection portion 210 on the first pole 200 and the position of the second connection portion 310 on the second pole 300 is increased, which can further alleviate the risk of connection confusion between the sampling element 410 and the first pole 200 and the second pole 300, thereby improving the installation efficiency and accuracy of the sampling element 410.

In some embodiments, the first wire 420 includes a first line segment 421, a second line segment 422, and a third line segment 423 connected in sequence, wherein the first line segment 421 connects the sampling element 410, and the third line segment 423 connects the first connection portion 210, wherein the first line segment 421 and the third line segment 423 extend along the first direction x1, and the second line segment 422 extends along the direction intersecting the first direction x1. It can be understood that there may be other components, such as a fixing, between the sampling element 410 and the first connection portion 210 in the first direction x1, and the second line segment 422 can be used to avoid the above components; or the first wire 420 is connected to the pin of the sampling element 410, and the pin of the sampling element 410 is not arranged directly opposite to the first connection portion 210 in the first direction x1, that is, the first wire 420 is extended in the direction intersecting the first direction x1 through the second line segment 422, so as to be connected to the first connection portion 210 through the third line segment 423. When the first connection portion 210 is located on the side of the first pole 200 facing the second pole 300, that is, the first connection portion 210 is located on the side of the first pole 200 in the first direction x1, the first line segment 421 and the third line segment 423 extend along the first direction x1, so that the third line segment 423 can be connected to the first connection portion 210 from the first direction x1, thereby improving the stability of the connection between the first wire 420 and the first connection portion 210, and at the same time, the sampling element 410 and the first connection portion 210 can be connected on the shortest path in the first direction x1, thereby reducing the extension length of the first wire 420. Thus, the first line segment 421 and the third line segment 423 extend along the first direction x1, thereby facilitating the connection between the sampling element 410 and the first connection portion 210 in the first direction x1, thereby shortening the length of the first wire 420, and the second line segment 422 extends along the direction intersecting with the first direction x1, thereby facilitating the second line segment 422 to avoid other components outside the housing 100, thereby alleviating the risk of the first wire 420 interfering with other components.

In some embodiments, the second conductive wire 430 includes a fourth line segment 431, a fifth line segment 432, a sixth line segment 433, and a seventh line segment 434 connected in sequence, the fourth line segment 431 is connected to the sampling element 410, the seventh line segment 434 is connected to the second connection portion 310, the fourth line segment 431 and the sixth line segment 433 extend along the first direction x1, the fifth line segment 432 extends along a direction intersecting the first direction x1, and the seventh line segment 434 extends along the second direction x2. It is understandable that there may be other components, such as fixings, between the sampling element 410 and the second connection portion 310 in the first direction x1, and the fifth line segment 432 may be used to avoid the above components; or the second wire 430 is connected to the pin of the sampling element 410, and the pin of the sampling element 410 is not arranged directly opposite to the second connection portion 310 in the first direction x1, that is, the second wire 430 is extended in a direction intersecting the first direction x1 through the fifth line segment 432, and is connected to the second connection portion 310 through the sixth line segment 433 and the seventh line segment 434. When the second connection portion 310 is located at one side of the second pole 300 in the second direction x2, the seventh line segment 434 extends in the second direction x2, so that the seventh line segment 434 is connected to the second connection portion 310 from the second direction x2, so as to improve the stability of the connection between the second wire 430 and the second connection portion 310. At the same time, the fourth line segment 431 and the sixth line segment 433 extend in the first direction x1, and can connect the sampling unit and the second connection part 310 on the shortest path in the first direction x1, thereby reducing the extension length of the second wire 430. Therefore, the fourth line segment 431 and the sixth line segment 433 extend along the first direction x1, which is convenient for reducing the length of the second wire 430, and the fifth line segment 432 extends in a direction intersecting with the first direction x1, which is convenient for the fifth line segment 432 to avoid other components outside the housing 100, thereby alleviating the risk of the second wire 430 interfering with other components, and the seventh line segment 434 extends along the second direction x2, which is convenient for the seventh line segment 434 to be connected to the second connection part 310 accordingly.

In some embodiments, the sampling assembly 400 further includes a first connector 450, through which the first wire 420 is connected to the sampling element 410; and/or, the sampling assembly 400 further includes a second connector 460, through which the second wire 430 is connected to the sampling element 410. The first connector 450 and the second connector 460 may refer to components that realize electrical conduction between the first wire 420 and the first connection portion 210 and electrical conduction between the second wire 430 and the second connection portion 310. Taking the first connector 450 as an example, there are many ways to connect the first connector 450 and the first wire 420, for example, the connection between the two may be crimping, welding, plugging, bolting, winding, etc. Similarly, the connection between the first connector 450 and the sampling element 410 may also be crimping, welding, plugging, bolting, winding, etc. The connection between the second connector 460 and the sampling element 410 and the second wire 430 is similar to that of the first connector 450, and will not be repeated here. Thus, the first wire 420 and the second wire 430 can be connected to the sampling element 410 through the first connector 450 and the second connector 460 , respectively, thereby improving the reliability of the connection between the first wire 420 and the second wire 430 and the sampling element 410 .

In some embodiments, the end surface of the first pole 200 away from the inside of the housing 100 is recessed to form a first connection portion 210 in the shape of a groove; and/or the end surface of the second pole 300 away from the inside of the housing 100 is recessed to form a second connection portion 310 in the shape of a groove. Exemplarily, the shape of one end of the first wire 420 connected to the first connection portion 210 can match the groove, so that the first wire 420 is inserted into the first connection portion 210 in the shape of a groove. Similarly, the second wire 430 can also be inserted into the second connection portion 310 in the shape of a groove. Thus, the first wire 420 can be inserted into the first connection portion 210 in the shape of a groove, and the second wire 430 can be inserted into the second connection portion 310 in the shape of a groove, which improves the stability of the connection between the first wire 420 and the first pole 200 and the second wire 430 and the second pole 300.

In some embodiments, the sampling element 410 is located between the first pole 200 and the second pole 300 in the first direction x1. For example, the sampling element 410 may be located on the side of the reference plane 440 close to the first pole 200; or the sampling element 410 may be located on the side of the reference plane 440 close to the second pole 300; or the geometric center of the sampling element 410 may also be located on the reference plane 440. Thus, the extension length of the first wire 420 and the second wire 430 in the first direction x1 can be reduced, the production cost can be saved, and the complexity of the wiring harness can be reduced.

In some embodiments, the sampling assembly 400 further includes an insulating member 470, which is disposed on the side of the wall 110 away from the inside of the housing 100, and the sampling element 410, the first wire 420 and the second wire 430 are disposed on the insulating member 470. The insulating member 470 can be used to isolate the electrical connection components in the housing 120 from the first wire 420, the second wire 430 and the sampling element 410 outside the housing 120. Exemplarily, the insulating member 470 can be plastic, rubber, etc. In some application scenarios, the insulating member 470 can extend along the first direction x1, and the first wire 420, the sampling element 410 and the second wire 430 can be arranged in sequence on the insulating member 470 along the first direction x1. As a result, the insulating member 470 can provide support for the sampling assembly 400, and the risk of short circuit of the sampling assembly 400 can be reduced by the insulating member 470.

In some embodiments, the first wire 420 and the second wire 430 are at least partially buried in the insulating member 470. The first wire 420 and the second wire 430 may be partially or completely buried in the insulating member 470. Taking the first wire 420 as an example, for example, the first wire 420 may be buried in the insulating member 470 except for one end connected to the first connection part 210, and connected to the first connection part 210 through the exposed end. In some application scenarios, the first wire 420 and the second wire 430 are completely buried in the insulating member 470, and the first wire 420, the second wire 430 and the insulating member 470 form an integrated structure, thereby improving the stability of the sampling assembly 400. Thus, the first wire 420 and the second wire 430 can be fixed by the insulating member 470, and the first wire 420 and the second wire 430 can also be protected by the insulating member 470, further reducing the risk of short circuit of the sampling assembly 400.

In some embodiments, the insulating member 470 is provided with a first avoidance hole 471 penetrating the opposite surfaces of the insulating member 470, the first pole 200 is at least partially disposed in the first avoidance hole 471, and the first wire 420 extends from the side wall of the first avoidance hole 471 into the first avoidance hole 471 to connect with the first connecting portion 210; and/or, the insulating member 470 is provided with a second avoidance hole 472 penetrating the opposite surfaces of the insulating member 470, the second pole 300 is at least partially disposed in the second avoidance hole 472, and the second wire 430 extends from the side wall of the second avoidance hole 472 into the second avoidance hole 472 to connect with the second connecting portion 310. It can be understood that the radial dimension of the first avoidance hole 471 can be greater than the radial dimension of the first pole 200, so that the first pole 200 can be at least partially disposed in the first avoidance hole 471. The radial dimension of the second avoidance hole 472 may be greater than the radial dimension of the second pole 300, so that the second pole 300 can be at least partially disposed in the second avoidance hole 472. In some application scenarios, at least a portion of the first pole 200 may be exposed through the first avoidance hole 471, and at least a portion of the second pole 300 may be exposed through the second avoidance hole 472, reducing the risk of interference between the first pole 200 and the second pole 300 and the insulating member 470. The first wire 420 extends from the side wall of the first avoidance hole 471 into the first avoidance hole 471 to connect with the first connecting portion 210, which facilitates the partial embedding of the first wire 420 in the insulating member 470, and at the same time facilitates the connection between the first wire 420 and the first connecting portion 210, reducing the risk of crosstalk or short circuit when the first wire 420 is connected to the first connecting portion 210, and improving the reliability of the connection between the first wire 420 and the first connecting portion 210. The second wire 430 is similar to the first wire 420, and will not be described in detail here. Thus, the first avoidance hole 471 and the second avoidance hole 472 can avoid the first pole 200 and the second pole 300 respectively, alleviating the risk of interference between the insulating member 470 and the first pole 200 and the second pole 300, thereby improving the stability of the installation of the insulating member 470 on the wall 110, and at the same time facilitating the first wire 420 and the second wire 430 buried in the insulating member 470 to be connected to the first pole 200 and the second pole 300 respectively.

In some embodiments, the insulating member 470 is provided with a third avoidance hole 473 penetrating through the opposite surfaces of the insulating member 470, and the wall portion 110 is provided with an explosion-proof valve 111, the explosion-proof valve 111 is located between the first pole 200 and the second pole 300, and the third avoidance hole 473 corresponds to the explosion-proof valve 111. The explosion-proof valve 111 may refer to a component for releasing the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold value. It can be understood that when the internal pressure or temperature of the battery cell 10 is within a normal range, the explosion-proof valve 111 remains closed, so that the internal environment of the battery cell 10 is isolated from the external environment. When the internal pressure or temperature of the battery cell 10 reaches a dangerous threshold, the explosion-proof valve 111 can be opened and connect the internal environment of the battery cell 10 with the external environment, thereby balancing the pressure inside and outside the battery cell 10 and reducing the risk of the battery cell 10 exploding due to excessive pressure. The third avoidance hole 473 can be used to expose the explosion-proof valve 111, allowing the explosion-proof valve 111 to communicate with the external environment through the third avoidance hole 473, while reducing the risk of interference between the explosion-proof valve 111 and the insulating member 470. As a result, the explosion-proof valve 111 can release the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold, thereby improving the safety of the battery cell 10, and the third avoidance hole 473 alleviates the risk of interference between the insulating member 470 and the explosion-proof valve 111.

In some embodiments, the insulating member 470 is provided with a receiving groove 474, and the sampling element 410 is installed in the receiving groove 474. The sampling assembly 400 further includes a packaging cover plate 480, and the packaging cover plate 480 is covered in the notch of the receiving groove 474. The shape of the receiving groove 474 can match the shape of the sampling element 410, so that the sampling element 410 can be installed in the receiving groove 474. The shape of the packaging cover plate 480 can also match the shape of the notch of the receiving groove 474. Optionally, the packaging cover plate 480 can be made of a material with a certain hardness and strength, so that the packaging cover plate 480 is not easy to deform when it is squeezed and collided, thereby improving the safety of the sampling element 410. In some application scenarios, the receiving groove 474 can be located between the first pole 200 and the second pole 300. Therefore, the receiving groove 474 and the packaging cover plate 480 can provide support and protection for the sampling assembly 400, alleviate the risk of damage to the sampling assembly 400, and improve the reliability of the sampling assembly 400.

In some embodiments, the sampling assembly 400 further includes a data transmission line 490, which is fixed to the package cover plate 480 and is communicatively connected to the sampling element 410. The data transmission line 490 can be used to communicate with the sampling element 410, so as to transmit the battery 2 data collected by the sampling element 410. The communication method of the data transmission line 490 can be, but not limited to, infrared communication, Bluetooth transmission, ZigBee (ZigBee protocol), etc. The data transmission line 490 can be fixed to the package cover plate 480 by methods including but not limited to binding, clamping, bonding, etc. In some other embodiments, the package cover plate 480 is provided with at least one clamping groove, and optionally, the number of the clamping grooves is two, and the data transmission line 490 bundle can be clamped in the clamping groove, so as to be fixedly connected to the package cover plate 480. As a result, it is convenient to transmit the data signal collected by the sampling element 410 through the data transmission line 490.

In summary, the battery cell 10 provided in the present application includes a housing 100, a first pole 200, a second pole 300 and a sampling assembly 400, wherein the housing 100 includes a wall portion 110; the first pole 200 is disposed on the wall portion 110, and the first pole 200 has a first connecting portion 210; the second pole 300 is disposed on the wall portion 110, and the second pole 300 is spaced apart from the first pole 200 in the first direction x1, and the second pole 300 has a second connecting portion 310; the sampling assembly 400 Located outside the housing 100, the sampling assembly 400 includes a sampling element 410, a first wire 420, and a second wire 430. The first wire 420 connects the sampling element 410 and the first connection portion 210, and the second wire 430 connects the sampling element 410 and the second connection portion 310. The first connection portion 210 and the second connection portion 310 are asymmetrically arranged with a reference plane 440, and the reference plane 440 is perpendicular to the first direction x1 and passes through the midpoint between the first pole 200 and the second pole 300. As a result, the first pole 200 and the second pole 300 can be easily distinguished through the first connection portion 210 and the second connection portion 310, and the risk of confusion between the sampling element 410 and the first pole 200 and the second pole 300 is alleviated, thereby improving the installation efficiency and accuracy of the sampling element 410. Compared with other types of battery cells, the installation efficiency and accuracy of the sampling element 410 of the battery cell 10 of the present application are higher.

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

Claims (16)

1. A battery cell, characterized in that the battery cell comprises: a housing, including a wall portion; A first pole, disposed on the wall portion, wherein the first pole has a first connecting portion; A second pole, arranged on the wall portion, the second pole being spaced apart from the first pole in a first direction, and the second pole having a second connecting portion; A sampling assembly is located outside the housing, the sampling assembly includes a sampling element, a first wire and a second wire, the first wire connects the sampling element and the first connecting portion, the second wire connects the sampling element and the second connecting portion, the first connecting portion and the second connecting portion are asymmetrically arranged with respect to a reference plane, and the reference plane is perpendicular to the first direction and passes through a midpoint between the first pole and the second pole. 2 . The battery cell according to claim 1 , wherein the first connection portion is located on a side of the first pole facing the second pole, and the second connection portion is located on a side of the second pole in a second direction perpendicular to the first direction. 3. The battery cell according to claim 2, characterized in that the first wire comprises a first line segment, a second line segment and a third line segment connected in sequence, the first line segment is connected to the sampling element, the third line segment is connected to the first connection portion, wherein the first line segment and the third line segment extend along the first direction, and the second line segment extends along a direction intersecting the first direction. 4. The battery cell according to claim 2, characterized in that the second conductive wire comprises a fourth line segment, a fifth line segment, a sixth line segment and a seventh line segment connected in sequence, the fourth line segment is connected to the sampling element, the seventh line segment is connected to the second connecting portion, the fourth line segment and the sixth line segment extend along the first direction, the fifth line segment extends along a direction intersecting the first direction, and the seventh line segment extends along the second direction. 5. The battery cell according to any one of claims 1 to 4, characterized in that: The sampling assembly further includes a first connector, and the first wire is connected to the sampling element through the first connector; And/or, the sampling component further includes a second connector, and the second wire is connected to the sampling element via the second connector. 6. The battery cell according to any one of claims 1 to 4, characterized in that: The end surface of the first pole away from the interior of the housing is recessed to form the first connecting portion in a groove shape; And/or the end surface of the second pole away from the interior of the housing is recessed to form the second connecting portion in a groove shape. 7 . The battery cell according to claim 1 , wherein the sampling element is located between the first pole and the second pole in the first direction. 8. The battery cell according to any one of claims 1 to 4, characterized in that the sampling assembly further comprises an insulating member, the insulating member is arranged on a side of the wall away from the interior of the housing, and the sampling element, the first wire and the second wire are arranged on the insulating member. 9 . The battery cell according to claim 8 , wherein the first conductive wire and the second conductive wire are at least partially buried in the insulating member. 10. The battery cell according to claim 9, characterized in that: The insulating member is provided with a first avoidance hole penetrating two opposite surfaces of the insulating member, the first pole is at least partially disposed in the first avoidance hole, and the first wire extends from the side wall of the first avoidance hole into the first avoidance hole to be connected with the first connecting portion; And/or, the insulating member is provided with a second avoidance hole penetrating the opposite side surfaces of the insulating member, the second pole is at least partially arranged in the second avoidance hole, and the second wire extends from the side wall of the second avoidance hole into the second avoidance hole to be connected to the second connecting part. 11. The battery cell according to claim 8 is characterized in that the insulating member is provided with a third avoidance hole penetrating the opposite surfaces of the insulating member, the wall portion is provided with an explosion-proof valve, the explosion-proof valve is located between the first pole and the second pole, and the third avoidance hole corresponds to the explosion-proof valve. 12 . The battery cell according to claim 8 , wherein the insulating member is provided with a receiving groove, the sampling element is installed in the receiving groove, and the sampling assembly further comprises a packaging cover plate, the packaging cover plate is covered on a notch of the receiving groove. 13 . The battery cell according to claim 12 , wherein the sampling assembly further comprises a data transmission line, the data transmission line is fixed to the packaging cover plate, and the data transmission line is communicatively connected with the sampling element. 14 . The battery cell according to claim 1 , wherein the outer shell comprises a shell and an end cover, the shell is provided with an open end, the end cover is provided on the open end, and the first pole and the second pole are provided on the end cover. 15. A battery, characterized in that the battery comprises the battery cell according to any one of claims 1 to 14. 16. An electrical device, characterized in that the electrical device comprises the battery as claimed in claim 15.