Battery cell, battery device, and electric device

Abstract

A battery cell (12), a battery device (100), and an electric device, relating to the technical field of batteries. The battery cell (12) comprises a casing (121), an electrolyte, an electrode assembly (122), a pressure relief component (125), and a blocking member (127). The casing (121) comprises a first wall (1210). The first wall (1210) is provided with a pressure relief hole (126). The electrolyte is arranged in the casing (121). The electrode assembly (122) is arranged in the casing (121). The pressure relief component (125) covers the pressure relief hole (126). The pressure relief component (125) is sealingly connected to the first wall (1210) to form a connection portion (130). The blocking member (127) is connected to the first wall (1210) and the pressure relief component (125) and covers the connection portion (130). The battery cell (12) has high reliability.

Description

Battery monomer, battery device and electric device TECHNICAL FIELD

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

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] How to improve the reliability of the battery monomer is a problem to be solved in the battery technology.

[0004] SUMMARY

[0005] In view of the above problems, the present application provides a battery monomer, a battery device and an electric device, which can improve the reliability of the battery monomer.

[0006] In a first aspect, the present application provides a battery monomer, which comprises a shell, an electrolyte, an electrode assembly, a pressure relief component and a blocking piece. The shell comprises a first wall, and the first wall is provided with a pressure relief hole. The electrolyte is arranged in the shell. The electrode assembly is arranged in the shell. The pressure relief component covers the pressure relief hole, and the pressure relief component is sealingly connected with the first wall to form a connecting portion. The blocking piece is connected with the first wall and the pressure relief component and covers the connecting portion.

[0007] In the technical scheme of the present application, by arranging the blocking piece connected with the first wall and the pressure relief component and covering the connecting portion, the risk of electrolyte leakage can be reduced, and the reliability of the battery monomer can be improved.

[0008] In one or more embodiments of the first aspect, the battery monomer further comprises an insulating piece, which is located between the first wall and the electrode assembly in the thickness direction of the first wall. The blocking piece is connected to the insulating piece.

[0009] In the above scheme, the insulating piece can serve as an attachment interface for the blocking piece, reducing the difficulty of arranging the blocking piece. Since the insulating piece is located inside the battery monomer, the corrosion problem of the connecting portion by the electrolyte inside the battery monomer is alleviated, thereby improving the reliability of the connecting portion and reducing the risk of electrolyte leakage.

[0010] In one or more embodiments of the first aspect, the insulating piece has a receiving groove, the receiving groove is arranged opposite to the connecting portion, and at least part of the blocking piece is arranged in the receiving groove.

[0011] In the above solution, the receiving groove can limit the setting position of the blocking component, reducing the risk that the blocking component will block the pressure relief component and cause the pressure relief component to fail to be actuated in time. On the other hand, the setting of the receiving groove can facilitate the assembly of the blocking component.

[0012] In one or more embodiments of the first aspect, the receiving groove is an annular groove extending circumferentially along the pressure relief hole.

[0013] In the above scheme, since the receiving tank is a ring structure extending circumferentially along the pressure relief hole, it is beneficial to arrange ring-shaped blocking components, which can block the electrolyte in all directions, reduce the probability of electrolyte contact with the connection, and thus reduce the risk of electrolyte flowing to the pressure relief hole, causing electrolyte corrosion of the connection and failure of the connection.

[0014] In one or more embodiments of the first aspect, along the thickness direction of the first wall, the receiving groove includes a first groove segment, a second groove segment, and a third groove segment connected sequentially. The width of the second groove segment is smaller than the width of the first groove segment and smaller than the width of the third groove segment.

[0015] In the above solution, the "I"-shaped shape of the receiving tank helps to increase the contact area between the blocking component and the inner wall of the receiving tank, thereby improving the adhesion of the blocking component and the connection stability between the blocking component and the insulating component. On the one hand, it can reduce the risk that the blocking component will fail to block the electrolyte due to misalignment; on the other hand, it can reduce the risk that the moving blocking component will block the pressure relief component, causing the pressure relief component to fail to activate in time.

[0016] In one or more embodiments of the first aspect, the insulating member includes a boss having a first end face facing the connection portion, and a receiving groove is disposed on the first end face.

[0017] In the above scheme, the boss of the insulating component is provided with a receiving groove, which enables the insulating component to accommodate the blocking component, while also helping to reduce the mass of the insulating component and increase the energy density of the battery cell.

[0018] In one or more embodiments of the first aspect, the boss abuts against the pressure relief component along the thickness direction of the first wall, and there is a gap between the boss and the first wall.

[0019] In the above solution, since the boss abuts against the pressure relief component and there is a gap between the boss and the first wall, when the blocking component moves, it is easier for it to move away from the pressure relief component through the gap, which helps to reduce the risk that the pressure relief component cannot be opened in time due to the blocking component blocking the pressure relief component.

[0020] In one or more embodiments of the first aspect, the orthographic projection of the boss falls within the orthographic projection range of the first wall in the same projection plane perpendicular to the thickness direction of the first wall.

[0021] In the above scheme, the insulating piece can be supported by the first wall, which can reduce the risk that the force of the insulating piece acting on the pressure relief component is too large to cause the pressure relief component to deform and abnormally open.

[0022] In one or more embodiments of the first aspect, in the same projection plane perpendicular to the thickness direction of the first wall, the projection of the inner circumferential surface of the pressure relief hole is located inside the projection of the surface of the boss facing the pressure relief hole. Along the radial direction of the pressure relief hole, the minimum distance between the surface of the boss and the inner circumferential surface of the pressure relief hole is D, which satisfies: 0.5mm≤D≤4mm.

[0023] In the above scheme, when D≥0.5mm, the minimum distance between the surface of the boss and the inner circumferential surface of the pressure relief hole along the radial direction of the pressure relief hole is relatively large, thereby reducing the risk that the blocking piece moves to the vicinity of the pressure relief hole and blocks the pressure relief component, causing the pressure relief component to fail to open in time. When D≤4mm, it is beneficial to arrange a larger space accommodating groove, thereby increasing the volume of the blocking piece that can be arranged, and further reducing the risk of contact between the electrolyte and the connecting portion, thereby improving the reliability of the battery monomer. Therefore, when 0.5mm≤D≤4mm, the risk that the pressure relief component fails to open in time is reduced while the reliability of the battery monomer is improved.

[0024] In one or more embodiments of the first aspect, a plurality of bosses are provided, and the plurality of bosses are arranged at intervals around the circumference of the pressure relief hole.

[0025] In the above scheme, when the pressure relief component is actuated, the discharge can flow to the pressure relief hole through the gap between different bosses, making the pressure relief of the battery monomer more smooth.

[0026] In one or more embodiments of the first aspect, the boss is an annular boss, and the annular boss is provided with a channel, which penetrates the peripheral wall of the annular boss along the radial direction of the annular boss.

[0027] In the above scheme, when the pressure relief component is actuated, the discharge can flow to the pressure relief hole through the channel, making the pressure relief of the battery monomer more smooth.

[0028] In one or more embodiments of the first aspect, the first wall includes a body portion and a protruding portion, the protruding portion protruding from one side of the body portion facing the electrode assembly, the pressure relief hole penetrating the body portion and the protruding portion, and the pressure relief component is connected with the protruding portion to form the connecting portion. Along the thickness direction of the first wall, the connecting portion is closer to the electrode assembly than the body portion.

[0029] In the above scheme, since the connecting portion is closer to the electrode assembly than the body portion, when the battery monomer is arranged in an inverted manner, part of the electrolyte needs to flow in the opposite direction of the gravitational direction for a certain distance to contact the connecting portion. Such an arrangement can further reduce the probability of contact between the electrolyte and the connecting portion, thereby reducing the risk of corrosion of the connecting portion by the electrolyte and improving the reliability of the battery monomer.

[0030] In one or more embodiments of the first aspect, the convex part has a first surface facing the electrode assembly, the first surface is provided with a groove, at least part of the pressure relief component is arranged in the groove, and an outer circumferential surface of the pressure relief component is connected with an inner circumferential surface of the groove to form a connection part.

[0031] In the above scheme, the groove can serve as an assembly reference for the pressure relief component, thereby reducing the assembly difficulty of the pressure relief component.

[0032] In one or more embodiments of the first aspect, the pressure relief component is provided with a weak part, and a projection of the blocking piece does not overlap with a projection of the weak part in the same projection plane perpendicular to the thickness direction of the first wall.

[0033] In the above scheme, since the projection of the blocking piece does not overlap with the projection of the weak part, the arrangement of the blocking piece does not affect the actuation of the pressure relief component, and the battery monomer has high reliability.

[0034] In one or more embodiments of the first aspect, the blocking piece is made of an insulating material.

[0035] In the above scheme, since the blocking piece is made of an insulating material, the risk of short circuit of the battery monomer caused by the arrangement of the blocking piece can be reduced.

[0036] In one or more embodiments of the first aspect, the melting point of the blocking piece is greater than or equal to 85℃ and less than or equal to 120℃.

[0037] In the above scheme, on the one hand, the blocking piece can melt when the battery monomer is heated, so that the molten blocking material can perform secondary sealing on the first wall and the pressure relief component, and on the other hand, the blocking piece does not melt due to too low melting point when the battery monomer is used normally, thereby improving the stability of the blocking piece.

[0038] In one or more embodiments of the first aspect, the blocking piece includes one of paraffin, rosin, PE wax, polyolefin, stearic acid, and white oil.

[0039] In the above scheme, the blocking piece can melt after the battery monomer is heated, and the molten blocking material can flow to the vicinity of the first wall and the pressure relief component to perform secondary sealing on the connection part formed by the first wall and the pressure relief component.

[0040] In a second aspect, the application provides a battery device including the battery monomer in one or more embodiments.

[0041] In the above scheme, since the battery monomer in one or more embodiments has high reliability, the battery device including the battery monomer in one or more embodiments also has high reliability.

[0042] In one or more embodiments of the second aspect, the first wall is located below the electrode assembly along a direction of gravity.

[0043] In the above solution, since the first wall is located below the electrode assembly along a direction of gravity, the risk of the electrolyte flowing to the connecting portion under the action of gravity and corroding the connecting portion is high, that is, the risk of electrolyte leakage is high, and the blocking piece can significantly reduce the risk of electrolyte leakage, thereby making the battery monomer have higher reliability.

[0044] In a third aspect, the application provides a power consumption device, which comprises the battery monomer in one or more embodiments described above, or the battery device in one or more embodiments described above; the battery monomer or the battery device is used to provide electric energy.

[0045] In the above solution, since the battery monomer or the battery device in one or more embodiments described above has higher reliability, the power consumption device comprising the battery monomer or the battery device in one or more embodiments described above also has higher reliability.

[0046] The above description is only a summary of the technical solutions of the application. In order to enable the technical means of the application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable other purposes, features and advantages of the application to be more apparent and easy to understand, the following specific embodiments of the application are described in detail. BRIEF DESCRIPTION OF DRAWINGS

[0047] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the scope of the application. Moreover, the same reference numerals in different drawings represent the same or similar elements. In the drawings:

[0048] FIG. 1 is a structural schematic diagram of a vehicle according to some embodiments of the application;

[0049] FIG. 2 is an exploded view of a battery device according to some embodiments of the application;

[0050] FIG. 3 is an exploded view of a battery monomer according to some embodiments of the application;

[0051] FIG. 4 is an isometric view of a battery monomer according to some embodiments of the application;

[0052] FIG. 5 is a sectional view of a battery monomer according to some embodiments of the application;

[0053] FIG. 6 is a partial enlarged view of A in FIG. 5;

[0054] FIG. 7 is a partial enlarged view of B in FIG. 6;

[0055] FIG. 8 is a schematic diagram of a partial structure of a battery cell according to some embodiments of the present application;

[0056] FIG. 9 is a schematic diagram of a partial structure of a battery cell according to some other embodiments of the present application;

[0057] FIG. 10 is a schematic diagram of a structure of an insulating member according to some embodiments of the present application.

[0058] In the detailed description of implementations, reference has been made to the accompanying drawings, in which: 1000 - vehicle; 200 - controller; 300 - motor; 100 - battery device; 11 - case; 111 - first case; 112 - second case; 12 - battery cell; 121 - outer shell; 1211 - end cap; 1212 - housing; 122 - electrode assembly; 123 - electrode terminal; 124 - adapter tab; 125 - pressure relief component; 1251 - weak portion; 1210 - first wall; 12101 - body portion; 12102 - protrusion; 12103 - first surface; 12104 - groove; 126 - pressure relief hole; 127 - barrier; 128 - insulating member; 1281 - receiving groove; 12811 - first groove segment; 12812 - second groove segment; 12813 - third groove segment; 1282 - first end face; 1283 - boss; 12831 - passage; 129 - gap; 130 - connecting portion. DETAILED DESCRIPTION

[0059] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "include" and "have" and any variations thereof used in the specification and the claims and the above description of drawings are intended to cover not exclusive inclusion.

[0061] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0062] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated in to another embodiment.

[0063] In the description of embodiments of the present application, the term“a plurality of” means two or more (including two), and the same applies to“a plurality of groups” and“a plurality of pieces”.

[0064] In the present application, the shape of the battery cell can include, but is not limited to, a cylinder, a flat body, a cuboid, or other shapes, etc. The battery cell can include, but is not limited to, a cylindrical battery cell, a square battery cell, a soft-pack battery cell, and a blade battery cell according to the packaging method.

[0065] In some high-power applications such as electric vehicles, the application of battery devices includes three levels: battery cells, battery modules, and battery devices. A battery module is formed by electrically connecting a certain number of battery cells together and placing them in a frame in order to protect the battery cells from external impacts, heat, vibration, etc. A battery device refers to the final state of the battery device system installed in an electric vehicle. The battery device referred to in the embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. The battery device generally includes a box for packaging one or more battery cells. The box can reduce the risk of liquid or other foreign matter affecting the charging or discharging of the battery cells.

[0066] The battery device (Battery Apparatus) referred to in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) can include a plurality of battery cells connected in series, parallel, or mixed connection through busbar components.

[0067] In some embodiments, the battery cell assembly (Battery Cell Assembly) is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module (Battery Module) formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0068] In some embodiments, the battery device can be a battery pack including a case and one or more battery cell assemblies housed in the case.

[0069] As an example, the battery cell assembly can be a battery module, which can be housed in the case by fixing the battery module in the case.

[0070] As an example, the battery cell assembly can also be housed in the case by fixing a plurality of battery cells directly in the case.

[0071] Hereinafter, the embodiments described below will mainly be described with respect to a cuboid battery cell. It should be understood that the embodiments described below are also applicable to cylindrical battery cells or pouch battery cells or blade battery cells in some aspects.

[0072] In a general battery cell structure, the battery cell includes a housing, an electrode assembly, and an electrolyte. The housing includes an end cap and a case, and the end cap closes an opening of the case to define a receiving space for receiving the electrode assembly.

[0073] The development of battery technology needs to consider various design factors, such as performance parameters such as energy density, cycle life, discharge capacity, and charge / discharge rate, in addition to the reliability of the battery device.

[0074] For a battery cell, there are generally at least three protective measures. Specifically, the protective measures include at least a switching element, selection of an appropriate separator material, and a pressure relief component.

[0075] The pressure relief component refers to an element or component that is actuated to release the internal pressure or temperature of the battery cell when the internal pressure or temperature or other conditions of the battery cell reaches a predetermined threshold. The threshold is designed differently according to different design requirements. The threshold can depend on the material of one or more of the positive electrode sheet, the negative electrode sheet, the electrolyte, and the separator in the battery cell. The pressure relief component can take the form of a pressure relief valve, a gas valve, a pressure relief valve, or a safety valve, and can specifically take the form of a pressure-sensitive or temperature-sensitive element or structure, i.e., when the internal pressure or temperature or other conditions of the battery cell reaches a predetermined threshold, the pressure relief component performs an action or a weak structure provided in the pressure relief component is broken, thereby forming an opening or passage for the internal pressure or temperature to be released. The melting point and / or thickness of the weak structure is generally lower than that of other regions of the pressure relief component. For example, the weak structure can be a notch groove provided on the surface of the pressure relief component, etc.

[0076] The term "actuation" as used herein refers to the action or activation of the pressure relief component to a state, so that the internal pressure and temperature of the battery cell can be released. The action of the pressure relief component can include, but is not limited to, at least one of the following: cracking, breaking, tearing, melting or opening of the pressure relief component. The actuation of the pressure relief component can also be referred to as the opening of the pressure relief component. When the pressure relief component is actuated, the high-temperature and high-pressure substances inside the battery cell can be discharged as exhaust from the actuated part. In this way, the battery cell can be pressure released and temperature released in a controllable pressure or temperature, thereby reducing the risk of a more serious accident. For example, when a short circuit, overcharge or the like occurs, it can cause thermal runaway inside the battery cell, resulting in a sudden increase in pressure or temperature. In this case, the internal pressure and temperature can be released outwardly by the pressure relief component to reduce the probability of explosion or fire of the battery cell.

[0077] The exhaust from the battery cell as used herein includes, but is not limited to, electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gas generated by the reaction, flame, and the like.

[0078] The development of battery technology needs to consider various design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters, and the reliability of the battery device.

[0079] In a general battery cell, a connection part is formed between the pressure relief component and the pressure relief hole of the shell, so that the shell is in a sealed state. When the battery cell is in thermal runaway, the exhaust inside the shell is discharged through the pressure relief component to release the pressure inside the battery cell. However, when the above connection part fails, the risk of electrolyte leakage is high, and the reliability of the battery device is poor.

[0080] In view of this, the present application provides a battery cell, which comprises a shell, an electrolyte, an electrode assembly, a pressure relief component and a blocking piece. The shell comprises a first wall provided with a pressure relief hole. The electrolyte is arranged in the shell. The electrode assembly is arranged in the shell. The pressure relief component covers the pressure relief hole and is sealingly connected with the first wall to form a connection part. The blocking piece is connected with the first wall and the pressure relief component and covers the connection part. By arranging the blocking piece connected with the first wall and the pressure relief component and covering the connection part, the risk of electrolyte leakage can be reduced, and the reliability of the battery cell can be improved.

[0081] The technical solutions described in the embodiments of the present application are applicable to battery cells, battery devices and electric devices using the battery devices.

[0082] The electric device includes, but is not limited to, a battery car, an electric vehicle, a ship and a spacecraft, etc. The spacecraft includes, but is not limited to, an airplane, a rocket, a space shuttle and a spacecraft, etc.

[0083] The following embodiments are described by taking a vehicle 1000 as an example for convenience of description.

[0084] For example, FIG. 1 is a structural schematic diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile. The new energy automobile can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc. The vehicle 1000 can be provided with a motor 300, a controller 200, and a battery device 100. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be arranged at the bottom, the front, or the rear of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. For example, the battery device 100 can be used as an operating power source of the vehicle 1000, and can be used for the circuit system of the vehicle 1000, for example, for the power demand of starting, navigation, and operation of the vehicle 1000. In another embodiment of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also can be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0085] In order to meet different power demands, the battery device 100 can include a plurality of battery monomers 12. The plurality of battery monomers 12 can be connected in series, in parallel, or in a mixed connection. The mixed connection refers to a mixture of series connection and parallel connection. The battery device 100 can also be referred to as a battery pack. Alternatively, the plurality of battery monomers 12 can be connected in series, in parallel, or in a mixed connection to form a battery module, and the plurality of battery modules can be connected in series, in parallel, or in a mixed connection to form the battery device 100. That is, the plurality of battery monomers 12 can be directly connected to form the battery device 100, or can be connected to form a battery module, and the battery module can be connected to form the battery device 100.

[0086] For example, please refer to FIG. 2, which is an exploded view of a battery device 100 according to some embodiments of the present application. The battery device 100 can include a plurality of battery cells 12. The battery device 100 can also include a box 11, which is hollow inside, and the plurality of battery cells 12 are contained in the box 11. As shown in FIG. 2, there are two boxes, a first box 111 and a second box 112, which are buckled together. The shapes of the first box 111 and the second box 112 can be determined according to the shape of the combination of the plurality of battery cells 12. The first box 111 and the second box 112 can each have one open face. For example, the first box 111 and the second box 112 can each be a hollow cuboid and each have only one face as an open face. The open face of the first box 111 and the open face of the second box 112 are arranged opposite to each other, and the first box 111 and the second box 112 are buckled together to form the box 11 with a closed cavity. The plurality of battery cells 12 are combined in parallel, in series, or in a hybrid manner and then placed in the box 11 formed by buckling the first box 111 and the second box 112.

[0087] Optionally, the battery device 100 can also include other structures, which will not be described one by one here. For example, the battery device 100 can also include a current collecting component for realizing the electrical connection between the plurality of battery cells 12, such as parallel connection, series connection, or hybrid connection. Specifically, the current collecting component can realize the electrical connection between the battery cells 12 by connecting the electrode terminals 123 of the battery cells 12. Further, the current collecting component can be fixed to the electrode terminals 123 of the battery cells 12 by welding. The electrical energy of the plurality of battery cells 12 can be further led out through the box 11 by a conductive mechanism.

[0088] According to different power requirements, the number of battery cells 12 can be set to any value. The plurality of battery cells 12 can be connected in series, in parallel, or in a hybrid manner to achieve a larger capacity or power. Since the number of battery cells 12 included in each battery device 100 can be large, in order to facilitate installation, the battery cells 12 can be arranged in groups, and each group of battery cells 12 forms a battery module. The number of battery cells 12 included in the battery module is not limited and can be set according to requirements. The battery device 100 can include a plurality of battery modules, and these battery modules can be connected in series, in parallel, or in a hybrid manner.

[0089] Referring to FIG. 3, which is an exploded view of a battery cell 12 according to some embodiments of the present application, the battery cell 12 includes one or more electrode assemblies 122 and a housing 121. The housing 121 can include a shell 1212, which has a plurality of walls that enclose a cavity for receiving the electrode assembly 122. The shell 1212 can be shaped according to the shape of the one or more electrode assemblies 122 combined together, for example, the shell 1212 can be a hollow cuboid or a square or a regular polyhedron, and one of the faces of the shell 1212 has an opening so that the one or more electrode assemblies 122 can be placed inside the shell 1212. The shell 1212 is filled with an electrolyte, such as an electrolytic solution.

[0090] The battery cell 12 can also include two electrode terminals 123, which can be disposed on an end cap 1211. The end cap 1211 is generally a flat plate, and the two electrode terminals 123 are fixed on the flat surface of the end cap 1211. The two electrode terminals 123 are respectively a positive electrode terminal and a negative electrode terminal. Each electrode terminal 123 is respectively provided with a transition piece 124, which is located between the end cap 1211 and the electrode assembly 122, for electrically connecting the electrode assembly 122 and the electrode terminal 123. In the battery cell 12, the electrode assembly 122 can be provided as a single electrode assembly or multiple electrode assemblies according to actual use requirements, and the battery cell 12 is provided with multiple independent electrode assemblies 122.

[0091] According to some embodiments of the present application, referring to FIGS. 4-6, a battery cell 12 is provided, which includes a housing 121, an electrolyte, an electrode assembly 122, a pressure relief component 125, and a blocking piece 127. The housing 121 includes a first wall 1210, which is provided with a pressure relief hole 126. The electrolyte is disposed in the housing 121. The electrode assembly 122 is disposed in the housing 121. The pressure relief component 125 covers the pressure relief hole 126, and the pressure relief component 125 is sealingly connected with the first wall 1210 to form a connection portion 130. The blocking piece 127 is connected with the first wall 1210 and the pressure relief component 125 and covers the connection portion 130.

[0092] The housing 121 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0093] The battery cell 12 generally includes an electrode assembly 122. The electrode assembly 122 includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell 12, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time, the active ions can pass through.

[0094] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0095] As an example, the positive electrode current collector has two surfaces opposite in the thickness direction thereof, and the positive electrode active material is disposed on either one or both of the two opposite surfaces of the positive electrode current collector.

[0096] As an example, the positive electrode current collector can employ a metal foil or a composite current collector. For example, as a metal foil, silver-plated aluminum, silver-plated stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, or the like can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, or the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0097] As an example, the positive electrode active material can include at least one of lithium-containing phosphates, lithium transition metal oxides, and modified compounds thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as the positive electrode active material of the battery device 100 can also be used.

[0098] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0099] As an example, the negative electrode current collector can employ a metal foil or a composite current collector. For example, as a metal foil, silver-plated aluminum, silver-plated stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, or the like can be employed.

[0100] In some embodiments, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is disposed on either one or both of the two opposite surfaces of the negative electrode current collector.

[0101] As an example, the negative electrode active material can employ a negative electrode active material known in the art for use in the battery device 100. As an example, the negative electrode active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, lithium titanate, or the like. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as the negative electrode active material of the battery device 100 can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0102] In some embodiments, the separator is a separator film. The type of the separator film is not particularly limited in the present application, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0103] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different, and are not particularly limited. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes.

[0104] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is provided between the positive and negative electrodes, and functions to transport ions and separate the positive and negative electrodes.

[0105] In some embodiments, the battery cell 12 further includes an electrolyte that functions to conduct ions between the positive and negative electrodes. The electrolyte can be in a liquid state, a gel state, or a solid state. Among them, the liquid electrolyte includes an electrolyte salt and a solvent. The liquid electrolyte can also be referred to as an electrolyte solution.

[0106] In some embodiments, the electrolyte salt can include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoroboric oxalate, lithium boric oxalate, lithium difluoroboric dioxalate, and lithium tetrafluorophosphoric oxalate.

[0107] In some embodiments, the solvent can include at least one of ethylene carbonate, propylene carbonate, methyl ethyl 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, lactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether-based solvent. The ether-based solvent 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, dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ether.

[0108] Among them, the gel-state electrolyte includes a polymer as a skeleton network of the electrolyte, in combination with an ionic liquid-lithium salt.

[0109] Among them, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, and a composite solid-state electrolyte.

[0110] As an example, the polymer solid-state electrolyte can be a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid-lithium salt, a cellulose, or the like.

[0111] As an example, the inorganic solid-state electrolyte can include one or more of an oxide solid-state electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid-state electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorous sulfur, argyrodite), amorphous sulfide), a halide solid-state electrolyte, a nitride solid-state electrolyte, and a hydride solid-state electrolyte.

[0112] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0113] In some embodiments, the electrode assembly 122 is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are rolled into the jelly-roll structure.

[0114] In some embodiments, the electrode assembly 122 is in a stack structure.

[0115] The first wall 1210 can be any wall portion of the housing 121. For example, in some embodiments, the housing 121 includes a shell 1212 having an opening and an end cap 1211 closing the opening, and the first wall 1210 can be the end cap 1211. The first wall 1210 can also be any wall portion of the shell 1212.

[0116] The housing 121 is used to accommodate the electrolyte and the electrode assembly 122, and the housing 121 can be in various shapes and sizes. Specifically, the shape of the housing 121 can be determined according to the specific shape and size of the electrode assembly 122.

[0117] In some embodiments, the pressure relief component 125 has a weakened portion 1251 that ruptures to form a passage 12831 for the discharge to exit the inside of the battery monomer 12 after the pressure relief component 125 reaches an opening threshold. In other embodiments, the weakened portion 1251 is a score groove.

[0118] The barrier 127 can be made of an insulating material, and of course the barrier 127 can also be made of other materials as long as it can at least block the electrolyte to some extent.

[0119] The blocking piece 127 is connected with the first wall 1210 and the pressure relief component 125 and covers the connecting portion 130, meaning that in some cases, the blocking piece 127 can block the electrolyte inside the battery monomer 12 to a certain extent to reduce the probability of the electrolyte contacting the connecting portion 130, thereby reducing the risk of corrosion of the connecting portion 130. In other cases, the blocking piece 127 can be located outside the battery monomer 12, and the electrolyte can only leak outside the battery monomer 12 through the blocking piece 127 after the connecting portion 130 is defective, and the arrangement of the blocking piece 127 can also reduce the risk of electrolyte leakage.

[0120] In the technical solutions of the embodiments of the present application, by arranging the blocking piece 127 connected with the first wall 1210 and the pressure relief component 125 and covering the connecting portion 130, the risk of electrolyte leakage can be reduced, and the reliability of the battery monomer 12 can be improved.

[0121] According to some embodiments of the present application, please refer to FIGS. 4-6, the battery monomer 12 further includes an insulating piece 128, which is located between the first wall 1210 and the electrode assembly 122 along the thickness direction of the first wall 1210. The blocking piece 127 is connected to the insulating piece 128.

[0122] The blocking piece 127 is connected to the insulating piece 128, meaning that the insulating piece 128 can serve as an attachment interface of the blocking piece 127, reducing the difficulty of arranging the blocking piece 127.

[0123] The material of the insulating piece 128 can include but is not limited to plastic or rubber, etc.

[0124] In some embodiments, the shape of the insulating piece 128 can be plate-shaped.

[0125] In the above scheme, since the insulating piece 128 is located inside the battery monomer 12, the corrosion problem of the electrolyte inside the battery monomer 12 to the connecting portion 130 is alleviated, thereby improving the reliability of the connecting portion 130 and reducing the risk of electrolyte leakage.

[0126] According to some embodiments of the present application, please refer to FIGS. 4-6, the insulating piece 128 has a receiving groove 1281, which is arranged opposite to the connecting portion 130, and at least part of the blocking piece 127 is arranged in the receiving groove 1281.

[0127] The receiving groove 1281 can serve as an assembly reference of the blocking piece 127, in some embodiments, the blocking piece 127 can be completely located inside the receiving groove 1281, and in other embodiments, the blocking piece 127 can be partially located inside the receiving groove 1281, and the other part of the blocking piece 127 is located outside the receiving groove 1281.

[0128] The receiving groove 1281 can be a groove 12104 formed by recessing, or can be a through hole.

[0129] In some cases, a portion of the blocking piece 127 is in contact with the inner circumferential wall of the accommodation groove 1281, and another portion of the blocking piece 127 is in contact with the bottom wall of the blocking piece 127. In other cases, a portion of the blocking piece 127 is in contact with the inner circumferential wall of the accommodation groove 1281, and another portion of the blocking piece 127 is in contact with the remaining surface of the insulation piece 128. In the above cases, the accommodation groove 1281 can increase the adhesion of the blocking piece 127.

[0130] In the above scheme, the accommodation groove 1281 can define the setting position of the blocking piece 127, reduce the risk that the blocking piece 127 blocks the pressure relief component 125 and causes the pressure relief component 125 to fail to act in time, and on the other hand, the accommodation groove 1281 can facilitate the assembly of the blocking piece 127.

[0131] According to some embodiments of the present application, referring to FIGS. 4-6, the accommodation groove 1281 is an annular groove extending along the circumference of the pressure relief hole 126.

[0132] In the above scheme, since the accommodation groove 1281 is an annular structure extending along the circumference of the pressure relief hole 126, it is beneficial to arrange the annular blocking piece 127, which can block the electrolyte in all directions and reduce the probability of contact between the electrolyte and the connecting portion 130, thereby reducing the risk that the electrolyte flows to the pressure relief hole 126 and corrodes the connecting portion 130 to cause the connecting portion 130 to fail.

[0133] According to some embodiments of the present application, referring to FIGS. 4-8, along the thickness direction of the first wall 1210, the accommodation groove 1281 includes a first groove segment 12811, a second groove segment 12812, and a third groove segment 12813 connected in sequence. The width of the second groove segment 12812 is smaller than the width of the first groove segment 12811 and smaller than the width of the third groove segment 12813.

[0134] In some embodiments, referring to FIG. 8, the width of the first groove segment 12811 is smaller than the width of the third groove segment 12813, and the third groove segment 12813 is arranged opposite to the connecting portion 130. When the same volume of the blocking piece 127 is arranged and the adhesion of the blocking piece 127 is increased, the blocking piece 127 in the third groove segment 12813 can cover a larger area, which can further reduce the probability of contact between the electrolyte and the blocking piece 127 and further reduce the risk of failure of the connecting portion 130.

[0135] In the above solution, since the receiving groove 1281 is I-shaped, it is beneficial to increase the contact area between the blocking member 127 and the inner wall of the receiving groove 1281, thereby improving the adhesion of the blocking member 127 and the connection stability between the blocking member 127 and the insulating member 128. On the one hand, it can reduce the risk that the blocking member 127 will fail to block the electrolyte due to misalignment; on the other hand, it can reduce the risk that the pressure relief member 125 will fail to activate in time due to the movement of the blocking member 127 blocking the pressure relief member 125.

[0136] According to some embodiments of this application, referring to Figures 4-8 and 10, the insulating member 128 includes a boss 1283, the boss 1283 having a first end face 1282 facing the connecting portion 130, and a receiving groove 1281 disposed on the first end face 1282.

[0137] Compared to the other surfaces of the boss 1283 where the receiving groove 1281 is provided, when the blocking member 127 moves (for example, when the internal temperature of the battery cell 12 rises and part of the blocking member 127 is in a molten state), the molten blocking member 127 will flow through the connecting part 130 and be in a state of covering the connecting part 130. When the blocking member 127 solidifies, it is more likely that the blocking member 127 will still cover the connecting part 130, and the risk of sealing failure of the blocking member 127 is low.

[0138] When the space occupied by the insulating member 128 is fixed, compared with the flat insulating member 128, by providing a receiving groove 1281 on the boss 1283 of the insulating member 128, the blocking member 127 can cover the connecting part 130 while reducing the overall mass of the insulating member 128.

[0139] In the above scheme, the boss 1283 of the insulating member 128 is provided with a receiving groove 1281, which enables the insulating member 128 to have the ability to receive the blocking member 127, while also helping to reduce the mass of the insulating member 128 and improve the energy density of the battery cell 12.

[0140] According to some embodiments of this application, please refer to Figures 4-8 and Figure 10. Along the thickness direction of the first wall 1210, the boss 1283 abuts against the pressure relief component 125, and there is a gap 129 between the boss 1283 and the first wall 1210.

[0141] Please refer to Figures 7 and 8. In Figure 7, the left side of the boss 1283 abuts against the pressure relief component 125, and there is a gap 129 between the right side and the first wall 1210. When the blocking component 127 moves, it is easier for it to move to the right along the gap 129. That is, the risk of the blocking component 127 flowing to the pressure relief component 125 and blocking the component, causing the pressure relief component 125 to fail to open in time, is low.

[0142] In the above solution, since the boss 1283 abuts against the pressure relief component 125 and there is a gap 129 between the boss 1283 and the first wall 1210, when the blocking piece 127 moves, it is easier to move away from the pressure relief component 125 in the direction of the gap 129, thereby facilitating the reduction of the risk that the blocking piece 127 blocks the pressure relief component 125, causing the pressure relief component 125 to fail to open in time.

[0143] According to some embodiments of the present application, referring to FIGS. 4-8 and 10, in the same projection plane perpendicular to the thickness direction of the first wall 1210, the orthographic projection of the boss 1283 falls within the orthographic projection range of the first wall 1210.

[0144] After the insulation piece 128 is assembled, since in the same projection plane perpendicular to the thickness direction of the first wall 1210, the orthographic projection of the boss 1283 falls within the orthographic projection range of the first wall 1210, the force exerted by the insulation piece 128 on the pressure relief component 125 can be borne by the first wall 1210, thereby reducing the risk of excessive deformation of the pressure relief component 125 and abnormal opening of the pressure relief component 125.

[0145] In the above solution, the insulation piece 128 can be supported by the first wall 1210, thereby facilitating the reduction of the risk that the force exerted by the insulation piece 128 on the pressure relief component 125 is too large, causing the pressure relief component 125 to deform and abnormally open.

[0146] According to some embodiments of the present application, referring to FIG. 7, in the same projection plane perpendicular to the thickness direction of the first wall 1210, the projection of the inner circumferential surface of the pressure relief hole 126 is located inside the projection of the surface of the boss 1283 facing the pressure relief hole 126. Along the radial direction of the pressure relief hole 126, the minimum distance between the surface of the boss 1283 and the inner circumferential surface of the pressure relief hole 126 is D, satisfying: 0.5mm≤D≤4mm.

[0147] Along the radial direction of the pressure relief hole 126, the minimum distance between the surface of the boss 1283 and the inner circumferential surface of the pressure relief hole 126 can be any value between greater than or equal to 0.5mm and less than or equal to 4mm, for example, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm.

[0148] In the above scheme, when D is greater than or equal to 0.5 mm, the minimum distance between the surface of the radial protrusion 1283 along the pressure relief hole 126 and the inner circumferential surface of the pressure relief hole 126 is relatively large, thereby reducing the risk that the blocking piece 127 moves to the vicinity of the pressure relief hole 126 and blocks the pressure relief component 125, causing the pressure relief component 125 to fail to open in time; when D is less than or equal to 4 mm, the accommodating groove 1281 with a larger space is beneficial to be arranged, thereby increasing the volume of the blocking piece 127 that can be arranged, and further reducing the risk that the electrolyte contacts the connecting portion 130, thereby improving the reliability of the battery monomer 12; therefore, when 0.5 mm≤D≤4 mm, the risk that the pressure relief component 125 fails to open in time is reduced, and the reliability of the battery monomer 12 is improved at the same time.

[0149] According to some embodiments of the present application, the protrusion 1283 is provided in a plurality, and the plurality of protrusions 1283 are arranged at intervals around the circumference of the pressure relief hole 126.

[0150] In the above scheme, when the pressure relief component 125 is actuated, the discharge can flow to the pressure relief hole 126 through the gap 129 between different protrusions 1283, so that the pressure relief of the battery monomer 12 is more smooth.

[0151] According to some embodiments of the present application, please refer to FIG. 10, the protrusion 1283 is a ring-shaped protrusion 1283, and the ring-shaped protrusion 1283 is provided with a channel 12831, which penetrates the peripheral wall of the ring-shaped protrusion 1283 along the radial direction of the ring-shaped protrusion 1283.

[0152] In the above scheme, when the pressure relief component 125 is actuated, the discharge can flow to the pressure relief hole 126 through the channel 12831, so that the pressure relief of the battery monomer 12 is more smooth.

[0153] According to some embodiments of the present application, please refer to FIG. 6 and FIG. 7, the first wall 1210 includes a body portion 12101 and a protruding portion 12102, the protruding portion 12102 protrudes from the side of the body portion 12101 facing the electrode assembly 122, the pressure relief hole 126 penetrates the body portion 12101 and the protruding portion 12102, and the pressure relief component 125 is connected with the protruding portion 12102 to form the connecting portion 130. Along the thickness direction of the first wall 1210, the connecting portion 130 is closer to the electrode assembly 122 than the body portion 12101.

[0154] After the battery monomer 12 is assembled in an inverted manner, if the blocking piece 127 is displaced, please refer to FIG. 6, the blocking piece 127 tends to flow to the right and downward, and flows to the part of the body portion 12101 of the first wall 1210, and is less likely to flow to the pressure relief component 125. At the same time, if the electrolyte needs to climb the height of the protruding portion 12102 to contact the connecting portion 130.

[0155] In the above scheme, since the connecting portion 130 is closer to the electrode assembly 122 than the body portion 12101, when the battery monomer 12 is arranged in an inverted manner, part of the electrolyte needs to flow in the opposite direction of the gravity direction for a certain distance before it can contact the connecting portion 130. Such an arrangement can further reduce the probability of the electrolyte contacting the connecting portion 130, thereby reducing the risk of the electrolyte corroding the connecting portion 130 and improving the reliability of the battery monomer 12.

[0156] According to some embodiments of the present application, referring to FIGS. 6, 7 and 9, the convex portion 12102 has a first surface 12103 facing the electrode assembly 122, the first surface 12103 is provided with a groove 12104, at least part of the pressure relief component 125 is arranged in the groove 12104, and the outer circumferential surface of the pressure relief component 125 is connected with the inner circumferential surface of the groove 12104 to form the connecting portion 130.

[0157] Due to the presence of the groove 12104, the pressure relief component 125 can be pre-assembled in the groove 12104 during assembly, and then the connecting portion 130 is formed by bonding, hot melting or welding. The assembly difficulty of the pressure relief component 125 is relatively low.

[0158] In the above scheme, the groove 12104 can serve as an assembly reference for the pressure relief component 125, thereby reducing the assembly difficulty of the pressure relief component 125.

[0159] According to some embodiments of the present application, referring to FIGS. 6 and 7, the pressure relief component 125 is provided with a weak portion 1251, and in the same projection plane perpendicular to the thickness direction of the first wall 1210, the projection of the blocking piece 127 does not overlap with the projection of the weak portion 1251.

[0160] In some embodiments, the weak portion 1251 is a score groove arranged on the pressure relief component 125.

[0161] In the above scheme, since the projection of the blocking piece 127 does not overlap with the projection of the weak portion 1251, the arrangement of the blocking piece 127 will not affect the actuation of the pressure relief component 125, and the battery monomer 12 has higher reliability.

[0162] According to some embodiments of the present application, the blocking piece 127 is made of an insulating material.

[0163] Since the blocking piece 127 is made of an insulating material, the risk of the blocking piece 127 being short-circuited with other components in the battery device 100, such as the gasket, is relatively low, and the risk of being short-circuited with other components in the battery monomer 12, such as the first wall 1210 and the sealing nail, is also relatively low.

[0164] In the above scheme, since the blocking piece 127 is made of an insulating material, the risk of the battery monomer 12 being short-circuited due to the arrangement of the blocking piece 127 can be reduced.

[0165] According to some embodiments of the present application, the melting point of the blocking member 127 is greater than or equal to 85°C and less than or equal to 120°C.

[0166] The melting point of the blocking member 127 can be any value greater than or equal to 85°C and less than or equal to 120°C, such as 85°, 90°, 95°, 100°, 105°, 110°, 115°, or 120°, etc.

[0167] It should be noted that the melting point of the blocking member 127 described above is only some specific embodiments of the present application, as long as the melting point of the blocking member 127 meets the above range, it is within the scope of the present application.

[0168] In the above scheme, on the one hand, the blocking member 127 can melt when the battery monomer 12 is heated, so that the molten blocking material can perform secondary sealing on the first wall 1210 and the pressure relief component 125, on the other hand, the blocking member 127 will not melt due to too low melting point when the battery monomer 12 is used normally, which improves the stability of the blocking member 127.

[0169] According to some embodiments of the present application, the blocking member 127 includes one of paraffin, rosin, PE wax, polyolefin, stearic acid, and white oil.

[0170] It can be understood that the blocking member 127 can be composed of a single material, which can be any of the above materials; of course, the blocking member 127 can also be composed of two or more of the above materials.

[0171] In the above scheme, the blocking member 127 can melt after the battery monomer 12 is heated, and the molten blocking material can flow to the vicinity of the first wall 1210 and the pressure relief component 125 to perform secondary sealing on the connecting portion 130.

[0172] According to some embodiments of the present application, please refer to FIG. 2, the present application provides a battery device 100, which includes the battery monomer 12 in one or more embodiments described above.

[0173] The battery device 100 mentioned in the embodiments of the present application refers to a single physical module including one or more battery monomers 12 to provide higher voltage and capacity.

[0174] In some embodiments, the battery device 100 includes a box 11.

[0175] In some embodiments, the battery device 100 can be a battery module, and when there are multiple battery monomers 12, the multiple battery monomers 12 are arranged and fixed to form a battery module.

[0176] In some embodiments, the battery device 100 can be a battery pack, which includes the box 11 and the battery cell 12 or battery module contained in the box 11.

[0177] In some embodiments, the box 11 can be part of the chassis structure of the vehicle 1000. For example, part of the box 11 can be at least part of the floor of the vehicle 1000, or part of the box 11 can be at least part of the cross beam and longitudinal beam of the vehicle 1000.

[0178] In some embodiments, the battery device 100 can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0179] In the above scheme, since the battery cell 12 in one or more embodiments described above has high reliability, the battery device 100 including the battery cell 12 in one or more embodiments described above also has high reliability.

[0180] According to some embodiments of the present application, referring to FIG. 10, the first wall 1210 is located below the electrode assembly 122 along the direction of gravity.

[0181] In some embodiments, when the battery cell 12 is inverted and subjected to high-temperature baking, the molten barrier material can flow to the side of the connecting portion 130 facing the inside of the battery cell 12 under the action of gravity, thereby reducing the probability of contact between the electrolyte and the connecting portion 130.

[0182] In the above scheme, since the first wall 1210 is located below the electrode assembly 122 along the direction of gravity, the electrolyte flows to the connecting portion 130 under the action of gravity and corrodes the connecting portion 130, which has a high risk of electrolyte leakage. The barrier 127 can significantly reduce the risk of electrolyte leakage, thereby making the battery cell 12 have high reliability.

[0183] According to some embodiments of the present application, referring to FIG. 1, the present application provides a power-consuming device, which includes the battery cell 12 in one or more embodiments described above, or the battery device 100 in one or more embodiments described above; the battery cell 12 or the battery device 100 is used to provide electrical energy.

[0184] In the above scheme, since the battery cell 12 or the battery device 100 in one or more embodiments described above has high reliability, the power-consuming device including the battery cell 12 or the battery device 100 in one or more embodiments described above also has high reliability.

[0185] According to some embodiments of the present application, referring to FIGS. 5-10, the present application provides a battery cell 12, which comprises a shell 121, an electrolyte, an electrode assembly 122, an insulating piece 128, a pressure relief component 125, and a barrier 127 made of paraffin wax. The shell 121 comprises an end cover 1211 provided with a pressure relief hole 126. The electrolyte is arranged in the shell 121. The electrode assembly 122 is arranged in the shell 121. The pressure relief component 125 covers the pressure relief hole 126, and is sealingly connected with the end cover 1211 to form a connecting portion 130. The barrier 127 is connected with the end cover 1211 and the pressure relief component 125 and covers the connecting portion 130. In the thickness direction of the end cover 1211, the insulating piece 128 is located between the end cover 1211 and the electrode assembly 122. The barrier 127 is connected with the insulating piece 128. The insulating piece 128 has a receiving groove 1281, which is arranged opposite the connecting portion 130, and at least part of the barrier 127 is arranged in the receiving groove 1281. The receiving groove 1281 is an annular groove extending in the circumferential direction of the pressure relief hole 126. In the thickness direction of the end cover 1211, the receiving groove 1281 comprises a first groove segment 12811, a second groove segment 12812, and a third groove segment 12813 connected in sequence. The width of the second groove segment 12812 is smaller than the width of the first groove segment 12811 and the width of the third groove segment 12813. The insulating piece 128 comprises a boss 1283 having a first end face 1282 facing the connecting portion 130, and the receiving groove 1281 is arranged on the first end face 1282. In the thickness direction of the end cover 1211, the boss 1283 abuts against the pressure relief component 125, and a gap 129 exists between the boss 1283 and the end cover 1211. In the same projection plane perpendicular to the thickness direction of the end cover 1211, the orthographic projection of the boss 1283 falls within the orthographic projection range of the end cover 1211. The boss 1283 is an annular boss 1283 provided with a channel 12831 penetrating the peripheral wall of the annular boss 1283 in the radial direction of the annular boss 1283. The end cover 1211 comprises a body portion 12101 and a protruding portion 12102 protruding from one side of the body portion 12101 facing the electrode assembly 122, and the pressure relief hole 126 penetrates the body portion 12101 and the protruding portion 12102, and the pressure relief component 125 is connected with the protruding portion 12102 to form the connecting portion 130. In the thickness direction of the end cover 1211, the connecting portion 130 is closer to the electrode assembly 122 than the body portion 12101. The protruding portion 12102 has a first surface 12103 facing the electrode assembly 122, and the first surface 12103 is provided with a groove 12104, and at least part of the pressure relief component 125 is arranged in the groove 12104, and the outer peripheral surface of the pressure relief component 125 is connected with the inner peripheral surface of the groove 12104 to form the connecting portion 130.The pressure relief component 125 is provided with a weak portion 1251, and in the same projection plane perpendicular to the thickness direction of the end cover 1211, the projection of the blocking piece 127 does not overlap the projection of the weak portion 1251.

[0186] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery monomer comprises: a shell comprising a first wall, the first wall being provided with a pressure relief hole; an electrolyte arranged in the shell; an electrode assembly arranged in the shell; a pressure relief component covering the pressure relief hole, the pressure relief component being sealingly connected with the first wall to form a connecting portion; a barrier connected with the first wall and the pressure relief component and covering the connecting portion.

2. The battery cell of claim 1, wherein, The battery monomer further comprises an insulating member between the first wall and the electrode assembly along the thickness direction of the first wall. The barrier is connected to the insulating member.

3. The battery cell of claim 2, wherein, The insulating member has a receiving groove opposite the connecting portion, and at least part of the barrier is arranged in the receiving groove.

4. The battery cell of claim 3, wherein, The receiving groove is an annular groove extending along the circumferential direction of the pressure relief hole.

5. The battery cell according to claim 3 or 4, characterized in that The receiving groove comprises, along the thickness direction of the first wall, a first groove segment, a second groove segment and a third groove segment connected in sequence. The width of the second groove segment is smaller than the width of the first groove segment and the width of the third groove segment.

6. The battery cell of any one of claims 3-5, wherein, The insulating member comprises a boss having a first end face facing the connecting portion, and the receiving groove is arranged on the first end face.

7. The battery cell of claim 6, wherein, Along the thickness direction of the first wall, the boss abuts against the pressure relief component, and a gap exists between the boss and the first wall.

8. The battery cell according to claim 6 or 7, characterized in that In the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the boss falls within the orthographic projection range of the first wall.

9. The battery cell of any one of claims 6-8, wherein, In the same projection plane perpendicular to the thickness direction of the first wall, the projection of the inner circumferential surface of the pressure relief hole is located inside the projection of the surface of the boss facing the pressure relief hole. Along the radial direction of the pressure relief hole, the minimum distance between the surface of the boss and the inner circumferential surface of the pressure relief hole is D, which satisfies 0.5mm≤D≤4mm.

10. The battery cell of any one of claims 6-9, wherein, The boss is provided with a plurality of bosses arranged at intervals along the circumferential direction of the pressure relief hole.

11. The battery cell of any one of claims 6-10, wherein, The boss is an annular boss provided with a channel, which penetrates the peripheral wall of the annular boss along the radial direction of the annular boss.

12. The battery cell of any one of claims 1-11, wherein, The first wall comprises a body portion and a protruding portion protruding from the side of the body portion facing the electrode assembly, and the pressure relief hole penetrates the body portion and the protruding portion, and the pressure relief component is connected with the protruding portion to form the connecting portion. Along the thickness direction of the first wall, the connecting portion is closer to the electrode assembly than the body portion.

13. The battery cell of claim 12, wherein, The protruding portion has a first surface facing the electrode assembly, and the first surface is provided with a groove, and at least part of the pressure relief component is arranged in the groove, and the outer circumferential surface of the pressure relief component is connected with the inner circumferential surface of the groove to form the connecting portion.

14. The battery cell of any one of claims 1-13, wherein, The pressure relief component is provided with a weak portion, and in the same projection plane perpendicular to the thickness direction of the first wall, the projection of the barrier does not overlap with the projection of the weak portion.

15. The battery cell of any one of claims 1-14, wherein, The barrier is an insulating material.

16. The battery cell of any one of claims 1-15, wherein, The melting point of the barrier is greater than or equal to 85℃ and less than or equal to 120℃.

17. The battery cell of any one of claims 1-16, wherein, The barrier comprises at least one of paraffin, rosin, PE wax, polyolefin, stearic acid and white oil.

18. A battery device characterized by comprising: The battery monomer comprises any one of claims 1-17.

19. The battery device of claim 18, wherein, The first wall is located below the electrode assembly in a direction of gravity.

20. An electrical device, comprising: comprising a battery cell as defined in any one of claims 1 to 17, or a battery device of claim 18 or 19; The battery cell or the battery device is used for providing electrical energy.

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