Battery monomer, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises a shell, an end cover, electrolyte, an electrode assembly, a first insulating part, a second insulating part and a blocking part, wherein the shell is provided with an opening; the end cover covers the opening. The electrolyte is arranged in the shell. The electrode assembly is arranged in the shell. The first insulating part is located between the end cover and the electrode assembly in the thickness direction of the end cover. At least part of the second insulating part is arranged between the electrode assembly and the shell, at least part of the electrode assembly is wrapped by the second insulating part, and the second insulating part comprises a first part connected with the first insulating part. The blocking piece is arranged in the shell, and the blocking piece is arranged at the free end of the first part. According to the scheme, the reliability of the single battery is relatively high.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly relates to a battery cell, a battery device and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

[0003] How to improve the reliability of battery cells is an urgent problem to be solved in battery technology. Summary of the Utility Model

[0004] In view of the above problems, the present application provides a battery cell, a battery device and an electrical device, which can improve the reliability of the battery cell.

[0005] In a first aspect, the present application provides a battery cell. The battery cell includes a housing, an end cap, an electrolyte, an electrode assembly, a first insulating member, a second insulating member and a blocking member. The housing has an opening. The end cap covers the opening. The electrolyte is disposed in the housing. The electrode assembly is disposed in the housing. Along the thickness direction of the end cap, the first insulating member is located between the end cap and the electrode assembly. At least a part of the second insulating member is disposed between the electrode assembly and the housing. The second insulating member wraps at least a part of the electrode assembly. The second insulating member includes a first part connected to the first insulating member. The blocking member is disposed in the housing and is disposed at the free end of the first part.

[0006] In the technical solution of the embodiment of the present application, since the blocking member is disposed at the free end of the first part, the risk of the electrolyte leaking from between the first part and the first insulating member to the outside of the battery cell can be reduced, thereby improving the reliability of the battery cell.

[0007] In one or more embodiments of the first aspect, the second insulating member further includes a second part that wraps the electrode assembly. The outer peripheral surface of the first insulating member includes a first region and a second region. Along the thickness direction of the end cap, the first region is located on the side of the second region away from the end cap. The first part is connected to the first region. The blocking member covers the second region and at least a part of the first part.

[0008] In the above solution, the blocking member covers the second region and at least a part of the first part at the same time, increasing its coverage area, further reducing the risk of the electrolyte leaking from between the first part and the first insulating member to the outside of the battery cell, and further improving the reliability of the battery cell.

[0009] In one or more embodiments of the first aspect, the first insulating member has a first surface facing the end cap, the end cap has a second surface facing the inside of the battery cell, and a part of the blocking member is located between the first surface and the second surface.

[0010] In the above solution, since a part of the blocking member is located between the first surface and the second surface, the risk of electrolyte leakage from between the first surface and the second surface to the outside of the battery cell is reduced, and the reliability of the battery cell is further improved.

[0011] In one or more embodiments of the first aspect, the end cap and the housing are sealingly connected to form a connection portion, the blocking member connects the end cap and the housing, and is located on the side of the connection portion facing the inside of the battery cell.

[0012] In the above solution, the setting of the blocking member can reduce the risk of electrolyte corroding the connection portion and causing electrolyte leakage to the outside of the battery cell, and further improve the reliability of the battery cell.

[0013] In one or more embodiments of the first aspect, the end cap has a first connection surface, the housing has a second connection surface, the first connection surface and the second connection surface are arranged opposite to each other and connected to form a connection portion, and at least a part of the blocking member is arranged between the first connection surface and the second connection surface.

[0014] In the above solution, a part of the blocking member is arranged between the first connection surface and the second connection surface, reducing the probability of electrolyte entering between the first connection surface and the second connection surface, alleviating the corrosion problem of the connection portion by the electrolyte, thereby improving the reliability of the connection portion, reducing the risk of electrolyte leakage, and further improving the reliability of the battery cell.

[0015] In one or more embodiments of the first aspect, the end cap has a second surface facing the inside of the battery cell and a third surface facing away from the inside of the battery cell, and an outer peripheral surface of the end cap connecting the third surface and the second surface, the first connection surface is the outer peripheral surface of the end cap; a part of the inner peripheral surface of the housing forms the second connection surface.

[0016] In the above solution, at least a part of the end cap extends into the housing, so that the outer peripheral surface of the end cap can be connected and fixed to the inner peripheral surface of the housing, thereby forming a connection portion. At this time, the first connection surface is the outer peripheral surface of the end cap, and the second connection surface is a part of the inner peripheral surface of the housing.

[0017] In one or more embodiments of the first aspect, the housing has an end surface connecting the inner peripheral surface and the outer peripheral surface of the housing, the second connection surface is the end surface, the end cap has a second surface facing the inside of the battery cell, and a part of the second surface forms the first connection surface.

[0018] In the above solution, at least the part of the end cap connected to the housing does not extend into the housing, but is directly connected and fixed to the end face of the housing, thereby forming a connection part. At this time, the end face of the housing close to the opening is the second connection face, and a part of the side face of the end cap close to the inside of the housing in the thickness direction (i.e., the second surface of the end cap facing the inside of the battery cell) is the first connection face.

[0019] In one or more embodiments of the first aspect, the end cap has a second surface facing the inside of the battery cell, and at least part of the edge region of the second surface is configured as a guiding inclined surface.

[0020] In the above solution, when the end cap is located on the lower side of the battery cell and after the battery cell is heated, the blocking material is prevented from melting, and the molten blocking material can flow downward through the guiding inclined surface under the action of gravity and move to between the first connection face and the second connection face.

[0021] In one or more embodiments of the first aspect, the end cap further has a third surface facing away from the inside of the battery cell, and an outer peripheral surface connecting the third surface and the second surface. The included angle formed between the guiding inclined surface and the outer peripheral surface of the end cap is an obtuse angle.

[0022] In the above solution, since the included angle formed between the guiding inclined surface and the outer peripheral surface of the end cap is an obtuse angle, on the one hand, the molten blocking material can flow more gently, so that the blocking member can more fully fill the gap between the first connection face and the second connection face. On the other hand, the molten blocking material has sufficient flow velocity, which improves the efficiency of the blocking member flowing to between the first connection face and the second connection face, that is, improves the assembly efficiency of the blocking member.

[0023] In one or more embodiments of the first aspect, the guiding inclined surface surrounds the end cap and forms an annular region.

[0024] In the above solution, when the battery cell is heated, the blocking material initially located in the first part can move more uniformly to between the first connection face and the second connection face, thereby forming the blocking member of the present application and improving the sealing performance between the end cap and the housing.

[0025] In one or more embodiments of the first aspect, the end cap further includes a third surface facing away from the inside of the battery cell, and an outer peripheral surface of the end cap connecting the second surface and the third surface. A first groove is provided in the edge region of the second surface, one end of the first groove extends to the outer peripheral surface of the end cap, and at least part of the groove bottom wall of the first groove is configured as a guiding inclined surface.

[0026] In the above solution, the first groove can introduce the molten blocking material between the first connection surface and the second connection surface. The first groove can store a certain amount of molten blocking material. Therefore, the height of the area coated with the blocked material in the area on the inner circumferential surface of the housing opposite to the first groove is greater than that of other areas where the blocking material coats the inner circumferential surface of the housing, thereby improving the sealing effect between the end cap and the housing to at least a certain extent.

[0027] In one or more embodiments of the first aspect, there are multiple first grooves, and the multiple first grooves are arranged at intervals along the circumferential direction of the end cap.

[0028] In the above solution, after the blocking material melts, the molten material can flow evenly between the first connection surface and the second connection surface, improving the sealing uniformity between the end cap and the inner circumferential surface of the housing. Of course, by arranging multiple first grooves on the edge area of the first surface, the material used for the end cap can be further reduced, and the manufacturing cost of the end cap can be reduced.

[0029] In one or more embodiments of the first aspect, the second surface is further provided with a second groove, and the second groove is arranged at one end of the first groove away from the outer circumferential surface of the end cap and is communicated with the first groove.

[0030] In the above solution, the initial blocking material can also be stored in the second groove, and the thickness of the blocking material in the second groove is greater than that of the blocking material in other areas of the second surface. Therefore, after the battery cell is heated, the amount of the molten material in the second groove can support its flow to between the first connection surface and the second connection surface, so that the end cap and the housing have good sealing performance.

[0031] Of course, by arranging the second groove, the material used for the end cap can be further reduced, and the manufacturing cost of the end cap can be reduced.

[0032] In one or more embodiments of the first aspect, the second groove is an annular groove extending along the circumferential direction of the third surface.

[0033] In the above solution, the part of the initial blocking material in the second groove can have enough material amount after melting and can then flow circumferentially to between the first connection surface and the second connection surface, further improving the sealing performance between the end cap and the housing.

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

[0035] In the above solution, since the blocking member is made of an insulating material, the risk of short - circuiting the battery cell caused by setting the blocking member can be reduced.

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

[0037] In the above solution, on the one hand, the blocking member can be melted when the battery cell is heated, so that the melted blocking material can seal the end cap and the housing. On the other hand, the blocking member will not be melted due to too low melting point during the normal use of the battery cell, which improves the stability of the blocking member.

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

[0039] In the above solution, the blocking member can be melted after the battery cell is heated, and the melted blocking material can flow to seal the end cap and the housing, improving the reliability of the battery cell.

[0040] In the second aspect, the present application provides a battery device, which includes the battery cell in one or more of the above embodiments.

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

[0042] In one or more embodiments of the second aspect, the end cap is located below the housing along the direction of gravity.

[0043] In the above solution, since the end cap is located below the housing along the direction of gravity, the risk that the electrolyte flows to the connection part under the action of gravity and corrodes the connection part is relatively high, that is, the risk of electrolyte leakage is relatively high. Setting the blocking member can significantly reduce the risk of electrolyte leakage, so that the battery cell has high reliability.

[0044] In the third aspect, the present application provides an electrical device, which includes the battery cell in one or more of the above embodiments, or the battery device in one or more of the above embodiments; the battery cell or the battery device is used to provide electric energy.

[0045] In the above solution, since the battery cell or the battery device in one or more of the above embodiments has high reliability, the electrical device including the battery cell or the battery device in one or more of the above embodiments also has high reliability.

[0046] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make other purposes, features and advantages of the present application more obvious and understandable, the following specifically describes the specific embodiments of the present application. Description of the Drawings

[0047] Upon reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

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

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

[0050] Figure 3 is an exploded view of a battery cell according to some embodiments of the present application;

[0051] Figure 4 is a cross-sectional view of a battery cell according to some embodiments of the present application;

[0052] Figure 5 is Figure 4 a partial enlarged view of the position A in

[0053] Figure 6 is a schematic structural diagram of a blocking member according to some embodiments of the present application;

[0054] Figure 7 is a cross-sectional view of a partial structure of a battery cell according to some other embodiments of the present application;

[0055] Figure 8 is an axonometric view of an end cap according to some embodiments of the present application;

[0056] Figure 9 is Figure 8 a partial enlarged view of the position B in

[0057] The reference numerals in the specific embodiments are as follows:

[0058] 1000 - Vehicle; 200 - Controller; 300 - Motor; 100 - Battery device; 11 - Box; 111 - First box; 112 - Second box; 12 - Battery cell; 121 - Outer shell; 1211 - End cap; 12111 - Second surface; 12112 - Third surface; 12113 - Outer peripheral surface of the end cap; 12114 - Guide inclined surface; 1212 - Housing; 12121 - End face; 122 - Electrode assembly; 123 - Electrode terminal; 124 - Adapter piece; 125 - First insulating member; 1251 - First region; 1252 - Second region; 1253 - First surface; 126 - Blocking member; 127 - Second insulating member; 1271 - First part; 12711 - Free end; 1272 - Second part; 128 - First connection surface; 129 - Second connection surface; 130 - Connection portion; 131 - First groove; 132 - Second groove. Detailed implementation manner

[0059] The embodiments of the technical solution of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to 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 those of ordinary skill 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" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

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

[0062] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0063] In the description of the embodiments of the present application, the term "a plurality" 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).

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

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

[0066] The battery device (Battery Apparatus) mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel, or in a hybrid connection through a busbar component.

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

[0068] In some embodiments, the battery device may be a battery pack, and the battery pack includes a box and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box.

[0069] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0070] As an example, the battery cell assembly may also be accommodated in the box by directly fixing a plurality of battery cells to the box.

[0071] The following will mainly focus on the cuboid battery cell. It should be understood that the embodiments described below are also applicable to cylindrical battery cells, pouch battery cells, or blade battery cells in some aspects.

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

[0073] The development of battery technology needs to consider multiple design factors simultaneously. For example, performance parameters such as energy density, cycle life, discharge capacity, charge-discharge rate, etc. In addition, the reliability of the battery device also needs to be considered.

[0074] In a typical battery cell, a first insulating member is used to insulate and isolate the end cap and the electrode assembly, and a second insulating member is provided to wrap the electrode assembly. The risk of failure at the connection position between the second insulating member and the first insulating member is relatively high. Once the above position fails, the risk of electrolyte leakage will increase significantly, and the reliability of the battery device will decrease.

[0075] In view of this, the present application provides a battery cell. The battery cell includes a housing body, an end cap, an electrolyte, an electrode assembly, a first insulating member, a second insulating member, and a blocking member. The housing body has an opening. The end cap covers the opening. The electrolyte is disposed in the housing body. The electrode assembly is disposed in the housing body. Along the thickness direction of the end cap, the first insulating member is located between the end cap and the electrode assembly. At least a part of the second insulating member is disposed between the electrode assembly and the housing body. The second insulating member wraps at least a part of the electrode assembly. The second insulating member includes a first part connected to the first insulating member. The blocking member is disposed in the housing body and is disposed at the free end of the first part. Since the blocking member is disposed at the free end of the first part, the risk of electrolyte leaking from between the first part and the first insulating member to the outside of the battery cell can be reduced, thereby improving the reliability of the battery cell.

[0076] The technical solutions described in the embodiments of the present application are applicable to battery cells, battery devices, and electrical devices using battery devices.

[0077] Electrical devices include but are not limited to: battery-powered vehicles, electric vehicles, ships, spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecrafts, etc.

[0078] For the convenience of description in the following embodiments, a vehicle is taken as an example of an electrical device according to an embodiment of the present application.

[0079] For example, Figure 1Schematic diagram of the structure of vehicle 1000 according to some embodiments of the present application. Vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A motor 300, a controller 200, and a battery device 100 can be arranged inside vehicle 1000. The controller 200 is used to control the power supply of the battery device 100 to the motor 300. For example, the battery device 100 can be arranged at the bottom, the front end, or the rear end of vehicle 1000. The battery device 100 can be used for the power supply of vehicle 1000. For example, the battery device 100 can be used as the operating power source of vehicle 1000 and be used for the circuit system of vehicle 1000, such as for the working power requirements during the start-up, navigation, and operation of vehicle 1000. In another embodiment of the present application, the battery device 100 can not only be used as the operating power source of vehicle 1000 but also be used as the driving power source of vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for vehicle 1000.

[0080] To meet different power usage requirements, the battery device 100 can include a plurality of battery cells 12. Among them, the plurality of battery cells 12 can be connected in series, in parallel, or in a series-parallel combination. The series-parallel combination means a combination of series and parallel. The battery device 100 can also be referred to as a battery pack. Optionally, the plurality of battery cells 12 can be first connected in series, in parallel, or in a series-parallel combination to form battery modules, and then the plurality of battery modules can be connected in series, in parallel, or in a series-parallel combination to form the battery device 100. That is to say, the plurality of battery cells 12 can directly form the battery device 100, or can first form battery modules, and then the battery modules form the battery device 100.

[0081] For example, please refer to Figure 2 , Figure 2 Explosion diagram of the 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 body 11. The inside of the box body 11 is a hollow structure, and the plurality of battery cells 12 are accommodated in the box body 11. As Figure 2 shown, here they are respectively referred to as the first box body 111 and the second box body 112. The first box body 111 and the second box body 112 are snapped together. The shapes of the first box body 111 and the second box body 112 can be determined according to the shape of the combination of the plurality of battery cells 12. The first box body 111 and the second box body 112 can both have an opening surface. For example, the first box body 111 and the second box body 112 can both be hollow cuboids and each have only one surface as the opening surface. The opening surfaces of the first box body 111 and the second box body 112 are arranged opposite to each other, and the first box body 111 and the second box body 112 are snapped together to form the box body 11 with a closed chamber. The plurality of battery cells 12 are connected in parallel, in series, or in a series-parallel combination and then placed in the box body 11 formed after the first box body 111 and the second box body 112 are snapped together.

[0082] Optionally, the battery device 100 may further include other structures, which will not be elaborated here one by one. For example, the battery device 100 may further include a busbar component for realizing electrical connection between multiple battery cells 12, such as in parallel, series, or a combination of both. Specifically, the busbar component can achieve electrical connection between the battery cells 12 by connecting the electrode terminals 123 of the battery cells 12. Further, the busbar component can be fixed to the electrode terminals 123 of the battery cells 12 by welding. The electrical energy of multiple battery cells 12 can be further led out through a conductive mechanism passing through the box body 11.

[0083] According to different power requirements, the number of battery cells 12 can be set to any value. Multiple battery cells 12 can be connected in series, parallel, or in a combination of both to achieve a larger capacity or power. Since the number of battery cells 12 included in each battery device 100 may be relatively large, for ease of installation, the battery cells 12 can be grouped, 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 multiple battery modules, and these battery modules can be connected in series, parallel, or in a combination of both.

[0084] Please refer to the figure shown. Figure 3 It is an exploded view of the 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 may include a housing body 1212, and multiple wall portions of the housing body 1212, i.e., multiple wall portions of the housing 121, enclose a cavity for accommodating the electrode assemblies 122. The housing body 1212 is determined according to the shape after combination of one or more electrode assemblies 122. For example, the housing body 1212 can be a hollow cuboid, cube, or regular polyhedron, and one of the faces of the housing body 1212 has an opening so that one or more electrode assemblies 122 can be placed inside the housing body 1212. The housing body 1212 is filled with an electrolyte, such as an electrolyte solution.

[0085] The battery cell 12 may further include two electrode terminals 123, and the two electrode terminals 123 can be arranged on the end cap 1211. The end cap 1211 is generally in a flat plate shape, and the two electrode terminals 123 are fixed on the flat plate 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 correspondingly provided with a transition piece 124, which is located between the end cap 1211 and the electrode assembly 122 for realizing electrical connection between the electrode assembly 122 and the electrode terminal 123. In this battery cell 12, according to actual usage requirements, the electrode assembly 122 can be set to be single or multiple, and multiple independent electrode assemblies 122 are arranged in the battery cell 12.

[0086] According to some embodiments of the present application, with reference to Figures 4 - 6 , the present application provides a battery cell 12, which includes a housing 1212, an end cap 1211, an electrolyte, an electrode assembly 122, a first insulating member 125, a second insulating member 127, and a blocking member 126. The housing 1212 has an opening. The end cap 1211 covers the opening. The electrolyte is disposed inside the housing 1212. The electrode assembly 122 is disposed inside the housing 1212. Along the thickness direction of the end cap 1211, the first insulating member 125 is located between the end cap 1211 and the electrode assembly 122. At least a part of the second insulating member 127 is disposed between the electrode assembly 122 and the housing 1212. The second insulating member 127 wraps at least a part of the electrode assembly 122. The second insulating member 127 includes a first part 1271 connected to the first insulating member 125. The blocking member 126 is disposed inside the housing 1212 and is disposed at the free end 12711 of the first part 1271.

[0087] The outer shell 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.

[0088] 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 back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the short circuit between the positive and negative electrodes and allow the active ions to pass through at the same time.

[0089] In some embodiments, the positive electrode can be a positive electrode sheet, and the positive electrode sheet 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.

[0090] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0091] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as the metal foil, aluminum with silver plating on the surface, stainless steel with silver plating on the surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. can be used. 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 (such as 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.).

[0092] 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 conventional materials that can be used as the positive electrode active material of the battery device 100 may also be used.

[0093] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0094] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, titanium, etc. may be used.

[0095] In some embodiments, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0096] As an example, the negative electrode active material may be a negative electrode active material for the battery device 100 well-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, and lithium titanate, etc. The silicon-based materials may be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials may be selected from at least one of elemental tin, tin oxides, and tin alloys. 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 may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0097] In some embodiments, the separator is a separator membrane. The present application has no particular limitation on the type of the separator membrane, and any well-known porous structure separator membrane with good chemical stability and mechanical stability may be selected.

[0098] As an example, the main material of the separator membrane may be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator membrane may be a single-layer film or a multi-layer composite film, without particular limitation. When the separator membrane is a multi-layer composite film, the materials of each layer may be the same or different, without particular limitation. The separator may be a single component located between the positive and negative electrodes, or may be attached to the surfaces of the positive and negative electrodes.

[0099] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0100] In some embodiments, the battery cell 12 further includes an electrolyte, which functions to conduct ions between the positive and negative electrodes. The electrolyte can be liquid, gel or solid. Among them, the liquid electrolyte includes an electrolyte salt and a solvent. The liquid electrolyte can also be referred to as an electrolytic solution.

[0101] In some embodiments, the electrolyte salt can include 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 difluoro(oxalato)borate, lithium bis(oxalato)borate, lithium difluoro(bis(oxalato))phosphate, and lithium tetrafluoro(oxalato)phosphate.

[0102] In some embodiments, the solvent can include 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, lactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether solvent. The ether 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, methyltetrahydrofuran, diphenyl ether, and crown ether.

[0103] Among them, the gel electrolyte includes a polymer as the skeleton network of the electrolyte, combined with an ionic liquid-lithium salt.

[0104] Among them, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0105] As an example, the polymer solid electrolyte can be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single-ion polymer, poly(ionic liquid)-lithium salt, cellulose, etc.

[0106] As an example, the inorganic solid electrolyte can include oxide solid electrolytes (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), sulfide solid electrolytes (crystalline lithium superionic conductor (lithium germanium phosphorus sulfur, argyrodite), amorphous sulfide), and one or more of halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0107] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to the polymer solid electrolyte.

[0108] In some embodiments, the electrode assembly 122 has a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0109] In some embodiments, the electrode assembly 122 has a laminated structure.

[0110] The material of the first insulating member 125 may include, but is not limited to, rubber, plastic, or plastic, etc.

[0111] The first portion 1271 is connected to the remaining portion of the second insulating member 127, and the end that is not connected to the remaining portion of the second insulating member 127 is called the free end 12711. In some embodiments, please refer to Figure 5 , Figure 5 where the upper end of the first portion 1271 in

[0112] The second insulating member 127 can prevent the diaphragm from being scratched by the outer casing 121 when the electrode assembly 122 is inserted into the casing, and at the same time play the role of insulating the electrode assembly 122 and the casing 1212.

[0113] In some embodiments, the second insulating member 127 is a polyester film made of a polymer material and has high reflectivity and heat insulation properties.

[0114] The first portion 1271 and the first insulating member 125 can be connected by bonding or heat melting, etc.

[0115] In the technical solution of the embodiment of the present application, since the blocking member 126 is disposed at the free end 12711 of the first portion 1271, the risk of electrolyte leakage from between the first portion 1271 and the first insulating member 125 to the outside of the battery cell 12 can be reduced, thereby improving the reliability of the battery cell 12.

[0116] According to some embodiments of the present application, please refer to Figures 4 - 6 , the second insulating member 127 further includes a second portion 1272 that wraps the electrode assembly 122. The outer peripheral surface of the first insulating member 125 includes a first region 1251 and a second region 1252. Along the thickness direction of the end cap 1211, the first region 1251 is located on the side of the second region 1252 away from the end cap 1211. The first portion 1271 is connected to the first region 1251, and the blocking member 126 covers at least a part of the second region 1252 and the first portion 1271.

[0117] In some embodiments, the first portion 1271 may be a protrusion extending from the edge of the second portion 1272 in a direction away from the second portion 1272. In other embodiments, there may be a plurality of second portions 1272, and the plurality of second portions 1272 are arranged at intervals along the circumferential direction of the electrode assembly 122.

[0118] Please refer to Figure 5, since the blocking member 126 covers at least a part of the second region 1252 and the first portion 1271, the attachment area of the blocking member 126 is increased, which can improve the connection stability of the blocking member 126 and reduce the risk of seal failure of the battery cell 12 caused by the connection failure of the blocking member 126.

[0119] In the above solution, the blocking member 126 covers at least a part of the second region 1252 and the first portion 1271 at the same time, increasing its coverage area, further reducing the risk of electrolyte leakage from the first portion 1271 to the outside of the battery cell 12 between the first insulating member 125, and further improving the reliability of the battery cell 12.

[0120] According to some embodiments of the present application, referring to Figures 4 - 6 , the end cap 1211 and the housing 1212 are hermetically connected to form a connection portion 130, and the blocking member 126 connects the end cap 1211 and the housing 1212 and is located on the side of the connection portion 130 facing the inside of the battery cell 12.

[0121] The connection portion 130 can be formed by bonding, hot melting, welding, etc.

[0122] In some embodiments, the side facing the inside of the battery cell 12 can be understood as the side facing the electrode assembly 122.

[0123] In some embodiments, the end cap 1211 and the housing 1212 are welded to form a connection portion 130, and the weld seam is the connection portion 130.

[0124] In the above solution, the setting of the blocking member 126 can reduce the risk of electrolyte leakage to the outside of the battery cell 12 caused by the electrolyte corroding the connection portion 130, and further improve the reliability of the battery cell 12.

[0125] According to some embodiments of the present application, referring to Figures 4 - 6 , the end cap 1211 has a first connection surface 128, the housing 1212 has a second connection surface 129, the first connection surface 128 and the second connection surface 129 are disposed opposite to each other and connected to form a connection portion 130, and at least a part of the blocking member 126 is disposed between the first connection surface 128 and the second connection surface 129.

[0126] At least a part of the blocking member 126 is disposed between the first connection surface 128 and the second connection surface 129 and is located on the side of the connection portion 130 facing the inside of the battery cell 12. That is to say, there is inevitably a gap between the first connection surface 128 and the second connection surface 129 (even if the gap is small, the gap still exists). Therefore, at least a part of the blocking member 126 is disposed between the first connection surface 128 and the second connection surface 129, which can block the contact between the electrolyte and the connection portion 130 to a certain extent, thereby reducing the risk of corrosion of the connection portion 130.

[0127] In the above solution, a part of the blocking member 126 is disposed between the first connection surface 128 and the second connection surface 129, reducing the probability of electrolyte entering between the first connection surface 128 and the second connection surface 129, alleviating the corrosion problem of the connection portion 130 by the electrolyte, thereby improving the reliability of the connection portion 130, reducing the risk of electrolyte leakage, and further improving the reliability of the battery cell 12.

[0128] According to some embodiments of the present application, referring to Figures 4 - 6 , the end cap 1211 has a second surface 12111 facing the inside of the battery cell 12 and a third surface 12112 facing away from the inside of the battery cell 12, and an outer peripheral surface 12113 of the end cap connecting the third surface 12112 and the second surface 12111. The first connection surface 128 is the outer peripheral surface 12113 of the end cap; a part of the inner peripheral surface of the housing 1212 forms the second connection surface 129.

[0129] Along the thickness direction of the end cap 1211, the end cap 1211 has a second surface 12111 and a third surface 12112. The second surface 12111 faces the inside of the housing 1212, and the third surface 12112 faces away from the inside of the housing 1212. That is, after the battery cell 12 is assembled, the second surface 12111 is the inner side surface of the end cap 1211, and the third surface 12112 is the outer side surface of the end cap 1211.

[0130] Please refer to Figure 5 , in the embodiment where the first connection surface 128 is the outer peripheral surface 12113 of the end cap and a part of the inner peripheral surface of the housing 1212 forms the second connection surface 129, the connection portion 130 can be formed from the side of the third surface 12112.

[0131] In the above solution, at least a part of the end cap 1211 extends into the housing 1212, so that the outer peripheral surface 12113 of the end cap can be connected and fixed to the inner peripheral surface of the housing 1212, thereby forming the connection portion 130. At this time, the first connection surface 128 is the outer peripheral surface 12113 of the end cap, and the second connection surface 129 is a part of the inner peripheral surface of the housing 1212.

[0132] According to some embodiments of the present application, referring to Figure 7 , the housing 1212 has an end face 12121 connecting the inner peripheral surface and the outer peripheral surface of the housing 1212. The second connection surface 129 is the end face 12121, and the end cap 1211 has a second surface 12111 facing the inside of the battery cell 12. A part of the second surface 12111 forms the first connection surface 128.

[0133] Please refer to Figure 7, in the embodiment where the end face 12121 is the second connection face 129 and a part of the second surface 12111 is the first connection face 128, the connection part 130 can be formed from the outer peripheral side of the housing 1212.

[0134] In the above solution, at least the part of the end cap 1211 connected to the housing 1212 does not extend into the housing 1212, but is directly connected and fixed to the end face 12121 of the housing 1212, thereby forming the connection part 130. At this time, the end face 12121 of the housing 1212 close to the opening is the second connection face 129, and a part of the side face of the end cap 1211 close to the inside of the housing 1212 in the thickness direction (that is, the second surface 12111 of the end cap 1211 facing the inside of the battery cell 12) is the first connection face 128.

[0135] According to some embodiments of the present application, referring to Figures 8 - 9 , the end cap 1211 has a second surface 12111 facing the inside of the battery cell 12, and at least part of the edge area of the second surface 12111 is configured as a guiding inclined surface 12114.

[0136] That at least part of the edge area of the second surface 12111 is configured as the guiding inclined surface 12114 means that the guiding inclined surface 12114 is not on the same plane as other areas of the second surface 12111, and the guiding inclined surface 12114 is not parallel to other areas on the second surface 12111 either, but the guiding inclined surface 12114 is inclined compared with other areas on the second surface 12111.

[0137] For example, the guiding inclined surface 12114 has a first side away from the outer peripheral surface 12113 of the end cap and a second side close to the outer peripheral surface 12113 of the end cap. If the third surface 12112 is a relatively flat plane as a whole, then from the first side to the second side, the distance between the guiding inclined surface 12114 and the third surface 12112 gradually decreases. In some embodiments of the present application, the guiding inclined surface 12114 can be a plane, and of course it can also be an arc surface, as long as the distance between the guiding inclined surface 12114 and the third surface 12112 gradually decreases from the first side to the second side.

[0138] In the above solution, when the end cap 1211 is located on the lower side of the battery cell 12 and after the battery cell 12 is heated, the blocking material is prevented from melting, and the melted blocking material can flow downward through the guiding inclined surface 12114 under the action of gravity and move to between the first connection face 128 and the second connection face 129.

[0139] According to some embodiments of the present application, referring to Figures 8 - 9, the end cap 1211 further has a third surface 12112 facing away from the inside of the battery cell 12, and an outer peripheral surface connecting the third surface 12112 and the second surface 12111. The included angle formed between the guiding inclined surface 12114 and the outer peripheral surface 12113 of the end cap is an obtuse angle.

[0140] It should be noted that, in the embodiment where the outer peripheral surface 12113 of the end cap is configured as the first connection surface 128 and is connected to a part of the inner peripheral surface of the housing 1212 to form a connection portion 130, the molten blocking material can flow to the first connection surface 128 and the second connection surface 129 through the guiding inclined surface 12114; in the embodiment where the end surface 12121 of the housing 1212 is configured as the second connection surface 129 and a part of the second surface 12111 is the first connection surface 128 that cooperates with the second connection surface 129, at least a part of the second surface 12111 protrudes towards the inside of the battery cell 12 to form a protruding portion, and the guiding inclined surface 12114 can be the peripheral surface of the protruding portion.

[0141] In the above solution, since the included angle formed between the guiding inclined surface 12114 and the outer peripheral surface 12113 of the end cap is an obtuse angle, on the one hand, the molten blocking material can flow more gently, so that the blocking member 126 can more fully fill the gap between the first connection surface 128 and the second connection surface 129. On the other hand, the molten blocking material has sufficient flow velocity, which improves the efficiency of the blocking member 126 flowing to between the first connection surface 128 and the second connection surface 129, that is, improves the assembly efficiency of the blocking member 126.

[0142] According to some embodiments of the present application, referring to Figures 8 - 9 , the guiding inclined surface 12114 is arranged around the end cap 1211 and forms an annular region.

[0143] The guiding inclined surface 12114 can be arranged around the end cap 1211, and can further reduce the amount of material of the end cap 1211 and reduce the manufacturing cost of the end cap 1211.

[0144] In the above solution, when the battery cell 12 is heated, the blocking material initially located in the first part 1271 can move more uniformly to between the first connection surface 128 and the second connection surface 129, thereby forming the blocking member 126 of the present application and improving the sealing performance between the end cap 1211 and the housing 1212.

[0145] According to some embodiments of the present application, referring to Figures 8 - 9, the end cap 1211 further includes a third surface 12112 facing away from the interior of the battery cell 12, and an outer peripheral surface 12113 of the end cap connecting the second surface 12111 and the third surface 12112. A first groove 131 is provided in the edge region of the second surface 12111. One end of the first groove 131 extends to the outer peripheral surface 12113 of the end cap, and at least a part of the bottom wall of the first groove 131 is configured as a guiding inclined surface 12114.

[0146] It can be understood that in the area on the inner peripheral surface of the housing 1212 that is not directly opposite to the first groove 131, there is a gap communicating with the first groove 131 between it and the end cap 1211. The molten material flowing out of the first groove 131 coats the area on the inner peripheral surface of the housing 1212 that is not directly opposite to the first groove 131 through this gap.

[0147] Since the edge region of the second surface 12111 is not entirely an inclined surface, the flow of the molten material is more concentrated, and the molten material is more likely to reach between the first connection surface 128 and the second connection surface 129 through the first groove 131. The probability of the situation where the molten material is not easily flowing between the first connection surface 128 and the second connection surface 129 due to the overall excessive edge region of the second surface 12111 is reduced.

[0148] In the above solution, the first groove 131 can introduce the molten blocking material between the first connection surface 128 and the second connection surface 129, and the first groove 131 can store a certain amount of molten blocking material. Therefore, the height of the area coated with the blocking material on the inner peripheral surface of the housing 1212 directly opposite to the first groove 131 is larger than that of other areas on the inner peripheral surface of the housing 1212 coated with the blocking material, thereby improving the sealing effect between the end cap 1211 and the housing 1212 to at least a certain extent.

[0149] According to some embodiments of the present application, referring to Figures 8 - 9 , there are a plurality of first grooves 131, and the plurality of first grooves 131 are arranged at intervals along the circumferential direction of the end cap 1211.

[0150] In the above solution, after the blocking material melts, the molten material can flow evenly between the first connection surface 128 and the second connection surface 129, improving the sealing uniformity between the end cap 1211 and the inner peripheral surface of the housing 1212. Of course, by providing a plurality of first grooves 131 in the edge region of the first surface 1253, the material used for the end cap 1211 can be further reduced, and the manufacturing cost of the end cap 1211 can be reduced.

[0151] According to some embodiments of the present application, referring to Figures 8 - 9, the second surface 12111 is also provided with a second groove 132. The second groove 132 is provided at one end of the first groove 131 away from the outer peripheral surface 12113 of the end cap and communicates with the first groove 131.

[0152] In some embodiments, the bottom surface of the first groove 131 is connected to the bottom surface of the second groove 132 and the first connection surface 128. Thus, when the blocking material located in the second groove 132 is heated and melted in the battery cell 12, it can very easily flow through the bottom surface of the first groove 131 and reach between the first connection surface 128 and the second connection surface 129.

[0153] The molten blocking material can flow from the first surface 1253 to the inner peripheral surface of the housing 1212, and even the molten blocking material can flow between the first connection surface 128 and the second connection surface 129.

[0154] In the above solution, the initial blocking material can also be stored in the second groove 132, and the thickness of the blocking material in the second groove 132 is larger than the thickness of the blocking material in other areas of the second surface 12111. Therefore, after the battery cell 12 is heated, the amount of the material after melting the blocking material in the second groove 132 can support its flow between the first connection surface 128 and the second connection surface 129, so as to have good sealing performance between the end cap 1211 and the housing 1212.

[0155] Of course, by providing the second groove 132, the material used for the end cap 1211 can be further reduced, and the manufacturing cost of the end cap 1211 can be reduced.

[0156] According to some embodiments of the present application, referring to Figures 8 - 9 , the second groove 132 is an annular groove extending along the circumference of the third surface 12112.

[0157] In the above solution, the part of the initial blocking material in the second groove 132 can have a sufficient amount of material after melting and can then flow circumferentially between the first connection surface 128 and the second connection surface 129, so that the sealing performance between the end cap 1211 and the housing 1212 is further improved.

[0158] According to some embodiments of the present application, the blocking member 126 is made of an insulating material.

[0159] Since the blocking member 126 is made of an insulating material, the risk of short circuit between the blocking member 126 and other components in the battery cell 12 is also relatively low, such as components like the end cap 1211, the adapter plate 124, and the electrode terminal 123.

[0160] In the above solution, since the blocking member 126 is made of an insulating material, the risk of short circuit of the battery cell 12 caused by setting the blocking member 126 can be reduced.

[0161] According to some embodiments of the present application, the melting point of the barrier member 126 is greater than or equal to 85 °C and less than or equal to 120 °C.

[0162] The melting point of the barrier member 126 can be any value greater than or equal to 85 °C and less than or equal to 120 °C. For example, 85 °C, 90 °C, 95 °C, 100 °C, 105 °C, 110 °C, 115 °C or 120 °C, etc.

[0163] It should be noted that the above melting points of the barrier member 126 are only some specific embodiments of the present application. As long as the melting point of the barrier member 126 meets the above range, it is within the protection scope of the present application.

[0164] In the above solution, on the one hand, the barrier member 126 can be melted when the battery cell 12 is heated, so that the melted barrier material can seal the end cap 1211 and the housing 1212. On the other hand, the barrier member 126 will not be melted due to too low a melting point during the normal use of the battery cell 12, improving the stability of the barrier member 126.

[0165] According to some embodiments of the present application, the barrier member 126 includes one of paraffin wax, rosin, PE wax, polyolefin, stearic acid and white oil.

[0166] It can be understood that the barrier member 126 can be composed of a single material, and the single material can be any one of the above materials; of course, the barrier member 126 can also be jointly composed of two or more of the above multiple materials.

[0167] In the above solution, the barrier member 126 can be melted after the battery cell 12 is heated, and the melted barrier material can flow to seal the end cap 1211 and the housing 1212, improving the reliability of the battery cell 12.

[0168] According to some embodiments of the present application, please refer to Figure 2 , the present application provides a battery device 100, which includes the battery cell 12 in one or more of the above embodiments.

[0169] The battery device 100 mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells 12 to provide higher voltage and capacity.

[0170] In some embodiments, the battery device 100 includes a box body 11.

[0171] In some embodiments, the battery device 100 can be a battery module. When there are multiple battery cells 12, the multiple battery cells 12 are arranged and fixed to form a battery module.

[0172] In some embodiments, the battery device 100 may be a battery pack, which includes a box body 11 and battery cells 12, and the battery cells 12 or battery modules are accommodated in the box body 11.

[0173] In some embodiments, the box body 11 may be part of the chassis structure of the vehicle 1000. For example, a part of the box body 11 may form at least a part of the floor of the vehicle 1000, or a part of the box body 11 may form at least a part of the cross beams and longitudinal beams of the vehicle 1000.

[0174] In some embodiments, the battery device 100 may be an energy storage device. The energy storage device includes an energy storage container, an energy storage electrical cabinet, etc.

[0175] In the above solution, since the battery cells 12 in the above one or more embodiments have high reliability, the battery device 100 including the battery cells 12 in the above one or more embodiments also has high reliability.

[0176] According to some embodiments of the present application, the end cover 1211 is located below the housing 1212 in the direction of gravity.

[0177] In some embodiments, when the battery cell 12 is inverted and baked at a high temperature, the molten blocking 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 chance of the electrolyte contacting the connecting portion 130.

[0178] The end cover 1211 of the battery cell 12 in any of the above embodiments can be located below the housing 1212 in the direction of gravity.

[0179] In the above solution, since the end cover 1211 is located below the housing 1212 in the direction of gravity, the risk that the electrolyte flows to the connecting portion 130 and corrodes the connecting portion 130 is relatively high, that is, the risk of electrolyte leakage is relatively high. Setting the blocking member 126 can significantly reduce the risk of electrolyte leakage, thereby making the battery cell 12 have high reliability.

[0180] According to some embodiments of the present application, please refer to Figure 1 , the present application provides an electrical device, which includes the battery cell 12 in the above one or more embodiments, or, the battery device 100 in the above one or more embodiments; the battery cell 12 or the battery device 100 is used to provide electric energy.

[0181] In the above solution, since the battery cell 12 or the battery device 100 in the above one or more embodiments has high reliability, the electrical device including the battery cell 12 or the battery device 100 in the above one or more embodiments also has high reliability.

[0182] According to some embodiments of the present application, please refer to Figures 4 - 6 Figures 4 - 6 , the present application provides a battery cell 12, which includes a housing 1212, an end cap 1211, an electrolyte, an electrode assembly 122, a first insulating member 125, a second insulating member 127, and a barrier member 126. The housing 1212 has an opening. The end cap 1211 covers the opening. The electrolyte is disposed within the housing 1212. The electrode assembly 122 is disposed within the housing 1212. The end cap 1211 is located below the outer shell 121 in the direction of gravity. The barrier member is made of paraffin.

[0183] In the thickness direction of the end cap 1211, the first insulating member 125 is located between the end cap 1211 and the electrode assembly 122. At least a part of the second insulating member 127 is disposed between the electrode assembly 122 and the housing 1212. The second insulating member 127 wraps at least a part of the electrode assembly 122. The second insulating member 127 includes a first part 1271 connected to the first insulating member 125. The barrier member 126 is disposed within the housing 1212 and is disposed at the free end 12711 of the first part 1271. The second insulating member 127 further includes a second part 1272 that wraps the electrode assembly 122. The outer peripheral surface of the first insulating member 125 includes a first region 1251 and a second region 1252. In the thickness direction of the end cap 1211, the first region 1251 is located on the side of the second region 1252 away from the end cap 1211. The first part 1271 is connected to the first region 1251. The barrier member 126 covers the second region 1252 and at least a part of the first part 1271. The first insulating member 125 has a first surface 1253 facing the end cap 1211. The end cap 1211 has a second surface 12111 facing the interior of the battery cell 12. A part of the barrier member 126 is located between the first surface 1253 and the second surface 12111. The end cap 1211 and the housing 1212 are hermetically connected to form a connection portion 130. The barrier member 126 connects the end cap 1211 and the housing 1212 and is located on the side of the connection portion 130 facing the interior of the battery cell 12. The end cap 1211 has a first connection surface 128, and the housing 1212 has a second connection surface 129. The first connection surface 128 and the second connection surface 129 are disposed opposite to each other and are connected to form the connection portion 130. At least a part of the barrier member 126 is disposed between the first connection surface 128 and the second connection surface 129. The end cap 1211 has a second surface 12111 facing the interior of the battery cell 12 and a third surface 12112 facing away from the interior of the battery cell 12, and an outer peripheral surface 12113 of the end cap connecting the third surface 12112 and the second surface 12111. The first connection surface 128 is the outer peripheral surface 12113 of the end cap; a part of the inner peripheral surface of the housing 1212 forms the second connection surface 129.

[0184] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that, Comprising: A housing having an opening; An end cap covering the opening; An electrolyte disposed within the housing; An electrode assembly disposed within the housing; A first insulating member, along the thickness direction of the end cap, the first insulating member is located between the end cap and the electrode assembly; A second insulating member, at least partially disposed between the electrode assembly and the housing, and wrapping at least part of the electrode assembly, the second insulating member includes a first part connected to the first insulating member; A barrier member disposed within the housing, the barrier member is disposed at the free end of the first part.

2. The battery cell according to claim 1, wherein The second insulating member further includes a second part that wraps the electrode assembly; The outer peripheral surface of the first insulating member includes a first region and a second region. Along the thickness direction of the end cap, the first region is located on the side of the second region away from the end cap. The first part is connected to the first region, and the barrier member covers at least a part of the second region and the first part.

3. The battery cell according to claim 1, characterized in that, The first insulating member has a first surface facing the end cap, the end cap has a second surface facing the interior of the battery cell, and a part of the barrier member is located between the first surface and the second surface.

4. The battery cell according to claim 1, characterized in that, The end cap and the housing are sealingly connected to form a connection portion, the barrier member connects the end cap and the housing, and is located on the side of the connection portion facing the interior of the battery cell.

5. The battery cell according to claim 4, wherein The end cap has a first connection surface, the housing has a second connection surface, the first connection surface and the second connection surface are oppositely arranged and connected to form the connection portion, and at least a part of the barrier member is disposed between the first connection surface and the second connection surface.

6. The battery cell according to claim 5, characterized in that, The end cap has a second surface facing the interior of the battery cell and a third surface facing away from the interior of the battery cell, and the outer peripheral surface of the end cap connecting the third surface and the second surface. The first connection surface is the outer peripheral surface of the end cap; a part of the inner peripheral surface of the housing forms the second connection surface.

7. The battery cell according to claim 5, wherein The housing has an end surface connecting the inner peripheral surface and the outer peripheral surface of the housing, the second connection surface is the end surface, the end cap has a second surface facing the interior of the battery cell, and a part of the second surface forms the first connection surface.

8. The battery cell according to claim 5, wherein The end cap has a second surface facing the interior of the battery cell, and at least a part of the edge region of the second surface is configured as a guiding inclined surface.

9. The battery cell according to claim 8, characterized in that, The end cap further has a third surface facing away from the interior of the battery cell, and an outer peripheral surface connecting the third surface and the second surface; The included angle formed between the guiding inclined surface and the outer peripheral surface of the end cap is an obtuse angle.

10. The battery cell according to claim 8, characterized in that, The guiding inclined surface surrounds the end cap and forms an annular region.

11. The battery cell according to claim 8, wherein, The end cap further includes a third surface facing away from the interior of the battery cell, and the outer peripheral surface of the end cap connecting the second surface and the third surface; A first groove is provided in the edge region of the second surface, one end of the first groove extends to the outer peripheral surface of the end cap, and at least a part of the bottom wall of the first groove is configured as the guiding inclined surface.

12. The battery cell according to claim 11, wherein, There are a plurality of the first grooves, and the plurality of first grooves are arranged at intervals along the circumferential direction of the end cap.

13. The battery cell according to claim 11, wherein, The second surface is further provided with a second groove, which is arranged at one end of the first groove away from the outer peripheral surface of the end cover and communicates with the first groove.

14. The battery cell according to claim 13, characterized in that, The second groove is an annular groove extending circumferentially along the third surface.

15. The battery cell according to claim 1, wherein, The blocking member is made of an insulating material.

16. The battery cell according to claim 1, characterized in that, The melting point of the blocking member is greater than or equal to 85 °C and less than or equal to 120 °C.

17. The battery cell according to claim 1, characterized in that The blocking member includes one of paraffin wax, rosin, PE wax, polyolefin, stearic acid, and white oil.

18. A battery device, characterized in that, It includes the battery cell according to any one of claims 1-17.

19. The battery device according to claim 18, characterized in that, The end cover is located below the housing in the direction of gravity.

20. An electrical device, characterized in that, It includes the battery cell according to any one of claims 1-17, or the battery device according to claim 18 or 19; The battery cell or the battery device is used to provide electric energy.

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