Battery cell, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device, the battery monomer comprises: a housing, a cavity is formed in the housing, and at least one wall of the housing in a first direction is a first wall; the first insulating part is arranged in the cavity; and the high-temperature-resistant insulating part is arranged between the first wall and the first insulating part, and the heat-resistant temperature of the high-temperature-resistant insulating part is higher than that of the first insulating part. According to the technical scheme, the high-temperature-resistant insulating part is arranged between the first wall and the first insulating part, the heat-resistant temperature of the high-temperature-resistant insulating part is higher than that of the first insulating part, and the high-temperature-resistant insulating part can be isolated between the first wall and the switching piece in the cavity, so that the insulating property between the first wall and the switching piece is improved; the risk of short circuit between the adapter sheet and the first wall is reduced, the probability of thermal runaway test failure during thermal runaway test of the single battery is reduced, and the risk of fire and explosion during thermal runaway test of the single battery is reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, a battery device, and an electrical device. Background Technology

[0002] With the booming development of the new energy industry, battery cells, as the core component of various battery systems, are widely used in electric vehicles, energy storage power stations, and other fields. Ensuring the safety and stability of battery cells is crucial, and thermal runaway testing is a key means of evaluating their safety performance under extreme operating conditions.

[0003] During thermal runaway testing of individual battery cells, it was found that failures were typically due to internal short circuits within the cell, which could lead to fire or explosion. Therefore, reducing the risk of internal short circuits within battery cells is a pressing technical problem that needs to be addressed. Utility Model Content

[0004] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a battery cell, and a battery device and an electrical device including the battery cell, wherein the battery cell can reduce the risk of short circuit between the adapter and the first wall, and reduce the probability of thermal runaway test failure of the battery cell during thermal runaway test.

[0005] In a first aspect, embodiments of this application provide a battery cell, comprising: a housing having a cavity formed therein, at least one wall of the housing in a first direction being a first wall; a first insulating member disposed within the cavity; and a high-temperature resistant insulating member disposed between the first wall and the first insulating member, wherein the heat resistance temperature of the high-temperature resistant insulating member is greater than the heat resistance temperature of the first insulating member.

[0006] In the above technical solution, by setting a high-temperature resistant insulating component between the first wall and the first insulating component, and making the heat resistance temperature of the high-temperature resistant insulating component greater than that of the first insulating component, the high-temperature resistant insulating component can isolate the first wall from the adapter piece in the cavity, thereby improving the insulation performance between the first wall and the adapter piece, reducing the risk of short circuit between the adapter piece and the first wall, reducing the probability of thermal runaway test failure of the battery cell during thermal runaway test, and reducing the risk of fire and explosion of the battery cell during thermal runaway test.

[0007] In some embodiments of this application, the heat resistance temperature of the high-temperature resistant insulating component is greater than or equal to 240°C.

[0008] In the above technical solution, the heat resistance temperature of the high-temperature resistant insulating component is greater than or equal to 240℃, which can improve the heat resistance temperature of the high-temperature resistant insulating component, reduce the probability of the high-temperature resistant insulating component being heated and melted, further reduce the risk of short circuit between the adapter piece and the first wall, and reduce the probability of thermal runaway test failure of the battery cell during thermal runaway test.

[0009] In some embodiments of this application, the heat resistance temperature of the high-temperature resistant insulating component is greater than or equal to 280°C.

[0010] In the above technical solution, the heat resistance temperature of the high-temperature resistant insulating component is greater than or equal to 280℃, which can further improve the heat resistance temperature of the high-temperature resistant insulating component, further reduce the probability of the high-temperature resistant insulating component being heated and melted, further reduce the risk of short circuit between the adapter and the first wall, and reduce the probability of thermal runaway test failure of the battery cell during thermal runaway test.

[0011] In some embodiments of this application, the high-temperature resistant insulating component is an insulating heat-resistant adhesive.

[0012] In the above technical solution, the high-temperature resistant insulating component is made of heat-resistant insulating adhesive, which can be easily glued directly into the battery cell, reducing assembly difficulty, improving assembly efficiency, and enhancing the reliability of the fixed connection of the high-temperature resistant insulating component.

[0013] In some embodiments of this application, the high-temperature resistant insulating component is a polyimide adhesive layer, a polyimide tape, a polyester film tape, or a silicone tape.

[0014] In the above technical solution, the high-temperature resistant insulating component is a polyimide adhesive layer, polyimide tape, polyester film tape, or silicone tape. This not only enables the high-temperature resistant insulating component to withstand high temperatures for a longer period of time, but also gives it good adhesion, making it easy to reliably attach the high-temperature resistant insulating component to the first wall or the first insulating component, thereby improving assembly efficiency.

[0015] In some embodiments of this application, the high-temperature resistant insulating member is fixed to the surface of the first wall facing the first insulating member; and / or, the high-temperature resistant insulating member is fixed to the surface of the first insulating member facing the first wall.

[0016] In the above technical solution, the high-temperature resistant insulating component is fixed to the surface of the first wall facing the first insulating component. The high-temperature resistant insulating component can directly cover and shield the first wall, reducing the probability of the adapter piece overlapping with the first wall. Fixing the high-temperature resistant insulating component to the surface of the first insulating component facing the first wall can prevent the adapter piece from passing through the first insulating component and overlapping with the first wall, reducing the probability of the adapter piece overlapping with the first wall. In addition, it can also improve the stability of the internal structure of the battery cell, and the structural layout is reasonable.

[0017] In some embodiments of this application, the battery cell further includes: a terminal post, an adapter plate, and an electrode assembly. The terminal post is disposed through the first wall, and the adapter plate and the electrode assembly are both disposed in the cavity. The terminal post is connected to the electrode assembly through the adapter plate. The high-temperature resistant insulating component is directly opposite the adapter plate in the first direction.

[0018] In the above technical solution, the high-temperature resistant insulating component and the adapter plate are directly opposite each other in the first direction, which can effectively block the high-temperature resistant insulating component between the adapter plate and the first wall, further reducing the probability of the adapter plate overlapping with the first wall and improving the overall stability and service life of the battery cell.

[0019] In some embodiments of this application, the projection of the high-temperature resistant insulating member on the first wall completely covers the projection of the adapter plate on the first wall.

[0020] In the above technical solution, the projection of the high-temperature resistant insulating component on the first wall completely covers the projection of the adapter plate on the first wall. As a result, the high-temperature resistant insulating component can always block the connection between the adapter plate and the first wall, further effectively preventing the adapter plate from overlapping with the first wall and reducing the probability of internal short circuits in the battery cell.

[0021] In some embodiments of this application, the width dimension of the high-temperature resistant insulating member is less than or equal to the width dimension of the first wall in the width direction of the first wall.

[0022] In the above technical solution, the width of the high-temperature resistant insulating component is less than or equal to the width of the first wall. This not only effectively isolates the high-temperature resistant insulating component between the adapter piece and the first wall, thus reducing the risk of short circuit due to overlap between the adapter piece and the first wall, but also controls the size of the high-temperature resistant insulating component, avoiding space waste or installation inconvenience caused by the high-temperature resistant insulating component being too large.

[0023] In some embodiments of this application, the ratio of the width dimension of the high-temperature resistant insulating member to the width dimension of the first wall is greater than or equal to 0.8 and less than or equal to 0.99.

[0024] In the above technical solution, by making the ratio of the width of the high-temperature resistant insulating component to the width of the first wall greater than or equal to 0.8 and less than or equal to 0.99, the width of the high-temperature resistant insulating component can be kept within a suitable range. Under the premise of effectively isolating the adapter plate from the first wall and improving the overall stability of the battery cell, the structure of the high-temperature resistant insulating component is made compact and reasonable, reducing the space occupied by the high-temperature resistant insulating component in the battery cell housing, increasing the energy density of the battery cell, and reducing costs.

[0025] In some embodiments of this application, the length of the high-temperature resistant insulating member is greater than or equal to the length of the adapter piece in the length direction of the first wall.

[0026] In the above technical solution, the length of the high-temperature resistant insulating component is greater than or equal to the length of the adapter piece. On the one hand, this allows the high-temperature resistant insulating component to cover the adapter piece more comprehensively. No matter how the adapter piece changes in the length direction, the high-temperature resistant insulating component can effectively protect the adapter piece, reduce the risk of short circuit caused by the adapter piece contacting the first wall, improve the stability and reliability of the battery cell, reduce potential faults, and thus extend the service life of the battery cell.

[0027] In some embodiments of this application, the ratio of the length of the high-temperature resistant insulating component to the length of the adapter piece is less than or equal to 1.1.

[0028] In the above technical solution, by making the ratio of the length of the high-temperature resistant insulating component to the length of the adapter piece less than or equal to 1.1, the length of the high-temperature resistant insulating component can be kept within a suitable range, allowing it to fully cover the adapter piece. Under conditions such as high-temperature operation or thermal runaway testing of the battery cell, it can reliably prevent the adapter piece from colliding and short-circuiting with the first wall due to abnormal movement of the adapter piece, thereby improving the operational stability of the battery cell. It can also reduce the amount of material used for the high-temperature resistant insulating component and reduce the space occupied by the high-temperature resistant insulating component in the length direction of the first wall, making the internal structure of the battery cell more compact and reasonable.

[0029] In some embodiments of this application, in the first direction, the thickness of the high-temperature resistant insulating element is greater than or equal to 20 μm and less than or equal to 100 μm.

[0030] In the above technical solution, the thickness of the high-temperature resistant insulating component is greater than or equal to 20μm, which enables it to have sufficient insulation barrier performance. When the battery cell operates in a high-temperature environment, such as during thermal runaway testing, it can effectively prevent the adapter plate from accidentally contacting the first wall, reducing the risk of short circuits inside the battery cell. Meanwhile, the thickness of the high-temperature resistant insulating component is less than or equal to 100μm, which reduces the space occupied by the insulating component, making the internal structure of the battery cell more compact and reasonable, and also reducing costs.

[0031] In some embodiments of this application, the thickness of the high-temperature resistant insulating component is less than or equal to 50 μm.

[0032] In the above technical solution, the thickness of the high-temperature resistant insulating component is less than or equal to 50μm. This allows the high-temperature resistant insulating component to have sufficient insulation barrier performance while further reducing the amount of material used, lowering costs, reducing the space occupied by the high-temperature resistant insulating component in the battery cell, and improving the energy density of the battery cell.

[0033] In some embodiments of this application, one of the walls of the housing in a first direction is formed as a first wall, and two pole posts are provided on the first wall at intervals along the length direction of the first wall. The number of high-temperature resistant insulating parts and the number of adapter pieces are both two, and they correspond one-to-one with the two pole posts.

[0034] In the above technical solution, two poles are arranged at intervals on the first wall, and two high-temperature resistant insulating components are arranged one-to-one with the two poles and two adapter pieces. This allows each high-temperature resistant insulating component to specifically block the corresponding adapter piece, effectively reducing the risk of short circuit caused by abnormal movement of the adapter piece and contact with other components.

[0035] In some embodiments of this application, a pressure relief structure is provided on the first wall, and two high-temperature resistant insulating components are respectively arranged on both sides of the pressure relief structure along the length direction of the first wall.

[0036] In the above technical solution, a pressure relief structure is provided on the first wall. The pressure relief structure can release pressure in time to ensure the safe operation of the battery cell. Two high-temperature resistant insulating components are respectively arranged on both sides of the pressure relief structure along the length of the first wall. This can reduce the probability of high-temperature gas and splashes impacting the adapter, terminal post and high-temperature resistant insulating components during the pressure relief process, reduce the risk of short circuit and other faults, and help improve the stability and reliability of the battery cell under extreme operating conditions.

[0037] In some embodiments of this application, the housing includes a main shell and an end cap, the main shell being open on at least one side in a first direction, the end cap sealing the open side of the main shell and cooperating with the main shell to define a cavity, and at least one end cap being formed as a first wall.

[0038] In the above technical solution, by opening at least one side of the main casing in the first direction and sealing the main casing with an end cap, the casing is divided into two parts. This facilitates the installation and layout of the internal components of the battery cell, and makes it easier to repair, replace, or upgrade the internal components, thereby reducing maintenance costs and difficulty. At the same time, forming the end cap as the first wall facilitates the installation of terminals, pressure relief structures, and high-temperature resistant insulating components, optimizing the positional relationship between the various components of the battery cell, simplifying installation, and resulting in a compact structure.

[0039] Secondly, embodiments of this application provide a battery device comprising a battery cell according to the first aspect of this application.

[0040] In the above-described embodiments, since the battery device is equipped with the aforementioned battery cells, and since a high-temperature resistant insulating component is provided between the first wall and the first insulating component of the battery cells, and the heat resistance temperature of the high-temperature resistant insulating component is greater than that of the first insulating component, the high-temperature resistant insulating component can be isolated between the first wall and the adapter piece in the cavity, thereby improving the insulation performance between the first wall and the adapter piece, reducing the risk of short circuit between the adapter piece and the first wall, reducing the probability of thermal runaway test failure of the battery cells during thermal runaway test, reducing the risk of fire and explosion of the battery cells during thermal runaway test, and improving the overall performance of the battery device.

[0041] Thirdly, embodiments of this application provide an electrical device, including a battery device according to the second aspect of this application.

[0042] In the above-described embodiments, by providing the battery device of the second aspect, a high-temperature resistant insulating component is provided between the first wall and the first insulating component of the battery cell, and the heat resistance temperature of the high-temperature resistant insulating component is greater than that of the first insulating component. The high-temperature resistant insulating component can be isolated between the first wall and the adapter piece in the cavity, thereby improving the insulation performance between the first wall and the adapter piece, reducing the risk of short circuit between the adapter piece and the first wall, reducing the probability of thermal runaway test failure of the battery cell during thermal runaway test, and reducing the risk of fire and explosion of the battery cell during thermal runaway test, thereby improving the overall performance of the electrical device.

[0043] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0044] Figure 1 This is a structural schematic diagram of a vehicle according to an embodiment of this application;

[0045] Figure 2 This is an exploded view of a battery device according to an embodiment of this application;

[0046] Figure 3 This is a cross-sectional view of a battery cell according to an embodiment of this application;

[0047] Figure 4 This is an exploded view of a battery cell according to an embodiment of this application;

[0048] Figure 5 This is an exploded view of the top cover assembly of a battery cell according to some embodiments of this application;

[0049] Figure 6 yes Figure 5 The diagram shows the structure of the end cap and the high-temperature resistant insulating component.

[0050] Figure 7 yes Figure 6 Front view of the end cap and high-temperature resistant insulation shown;

[0051] Figure 8 yes Figure 6 Left view of the end cap and high-temperature resistant insulation shown;

[0052] Figure 9 These are exploded views of a battery cell according to other embodiments of this application;

[0053] Figure 10 yes Figure 9The diagram shows the structure of the first insulating component and the high-temperature resistant insulating component shown in the figure.

[0054] Figure 11 yes Figure 10 Front view of the first insulating component and the high-temperature resistant insulating component shown in the figure;

[0055] Figure 12 yes Figure 10 The left view of the first insulating component and the high-temperature resistant insulating component shown.

[0056] Figure label:

[0057] 1. Electrical appliances;

[0058] 100. Battery assembly; 200. Controller; 300. Motor;

[0059] 10. Battery cell; A. Top cover assembly;

[0060] 11. Shell; 101. Cavity;

[0061] 111. First wall; 1111. Pole mounting hole; 1112. Explosion-proof valve mounting hole; 1113. Liquid injection hole;

[0062] 112. Main shell;

[0063] 12. First insulating element; 121. First through hole; 122. First through hole;

[0064] 13. High-temperature resistant insulating components;

[0065] 14. Terminal post; 15. Adapter plate; 16. Electrode assembly;

[0066] 171. Sealing ring; 172. Second insulating component; 173. Riveting block;

[0067] 174. Pressure relief structure; 175. Protective plate; 176. Sealing nail; 177. Insulating film;

[0068] 20. Box body; 21. Box main body; 22. Lid;

[0069] Z, first direction; Y, second direction; X, third direction. Detailed Implementation

[0070] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0071] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0072] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0073] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0074] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0075] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two).

[0076] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0077] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0078] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include one or more battery cells, and when there are multiple battery cells, they are connected in series, parallel, or mixed connections via a busbar.

[0079] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0080] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0081] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0082] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0083] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0084] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0085] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0086] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0087] The battery cells mentioned in the embodiments of this application may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited to these. Battery cells may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to these shapes either. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these types either.

[0088] For example, a single battery cell typically includes a housing, a cell assembly, and an electrolyte. The housing is used to house the cell assembly and the electrolyte, and the housing has at least one positive electrode post and at least one negative electrode post. The cell assembly includes one or more electrode assemblies, which are formed by stacking or winding positive electrode sheets, negative electrode sheets, and separators.

[0089] The positive electrode generally includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated on the positive current collector. The positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as a positive electrode tab. Multiple positive electrode tabs are stacked together and form an electrical connection with the positive electrode post. For example, the multiple stacked positive electrode tabs can be directly soldered to the positive electrode post to form an electrical connection; or, the battery cell assembly can also include a positive electrode adapter piece. The multiple stacked positive electrode tabs are soldered to one end of the positive electrode adapter piece, and the other end of the positive electrode adapter piece is soldered to the positive electrode post, so that the positive electrode tabs and the positive electrode post form an electrical connection.

[0090] The negative electrode generally includes a negative current collector and a negative active material layer. The negative active material layer is directly or indirectly coated on the negative current collector. The negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer. The negative current collector without the negative active material layer serves as a negative electrode tab. Multiple negative electrode tabs are stacked together and form an electrical connection with the negative electrode post. For example, the stacked negative electrode tabs can be directly welded to the negative electrode post to form an electrical connection; alternatively, the battery cell assembly may also include a negative electrode adapter piece. The stacked negative electrode tabs are welded to one end of the negative electrode adapter piece, and the other end of the negative electrode adapter piece is welded to the negative electrode post, so that the negative electrode tabs and the negative electrode post form an electrical connection. The material of the separator is not limited; for example, it can be polypropylene or polyethylene.

[0091] Meanwhile, individual battery cells primarily function by the movement of metal ions between the positive and negative electrode plates. Taking lithium-ion batteries as an example, the positive electrode current collector can be made of aluminum, and the positive electrode active material layer can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode current collector can be made of copper, and the negative electrode active material layer can be made of carbon or silicon, etc. During charging and discharging, Li+ ions repeatedly insert and extract between the two electrodes: during charging, Li+ ions extract from the positive electrode, pass through the electrolyte, and insert into the negative electrode, leaving the negative electrode in a lithium-rich state; the reverse occurs during discharging.

[0092] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0093] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, battery devices, as the power source, play an irreplaceable and crucial role. Among them, battery devices, as core components of new energy vehicles, have high requirements in terms of both energy density and reliability.

[0094] As the core component of various battery devices, ensuring the safety and stability of battery cells is of paramount importance. Thermal runaway testing is a key means of evaluating the safety performance of battery cells under extreme operating conditions.

[0095] In related technologies, battery cells are prone to thermal runaway test failures during thermal runaway testing. The failure is usually caused by a short circuit inside the battery cell during testing, which can lead to the battery cell catching fire or exploding.

[0096] Based on the above considerations, in order to reduce the risk of internal short circuits in battery cells during thermal runaway testing, this application designs a battery cell in which a high-temperature resistant insulating component is installed between the first insulating component and the first wall. The heat resistance temperature of the high-temperature resistant insulating component is greater than that of the first insulating component. During the thermal runaway test of the battery cell, even if the first insulating component melts and deforms due to excessive temperature during the heating process, the high-temperature resistant insulating component can still maintain good shape and insulation performance, isolating between the first wall and the adapter piece. This ensures the insulation performance between the first wall and the adapter piece, reduces the probability of overlap between the first wall and the adapter piece, reduces the risk of short circuit between the adapter piece and the first wall, reduces the probability of thermal runaway test failure of the battery cell, and reduces the risk of fire and explosion of the battery cell during thermal runaway testing. As a result, the battery cell can complete the thermal runaway test more smoothly, and the data obtained from the thermal runaway test is more accurate and reliable.

[0097] This application provides an electrical device that uses the battery cell disclosed herein as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0098] For ease of explanation, the following embodiments use a vehicle as an example to describe in detail the structure of the electrical device 1, battery device 100, and battery cell 10 of this application.

[0099] Please refer to Figure 1 , Figure 1 The electrical device 1 provided in some embodiments of this application is a schematic diagram of a vehicle structure. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle is equipped with a battery device 100, which can be located at the bottom, front, or rear of the vehicle. The battery device 100 can be used to supply power to the vehicle; for example, the battery device 100 can serve as the vehicle's operating power source. The vehicle may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of starting, navigation, and driving the vehicle. In some embodiments of this application, the battery device 100 can not only serve as the vehicle's operating power source but also as the vehicle's driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle.

[0100] Please refer to Figure 2 , Figure 2This is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 20 and a plurality of battery cells 10. The housing 20 provides assembly space for the battery cells 10, which are housed within the housing 20. Figure 3 This is a cross-sectional view of the battery cell 10 according to an embodiment of this application; Figure 4 This is an exploded view of a battery cell 10 according to an embodiment of this application; Figure 5 This is an exploded view of the top cover assembly A of the battery cell 10 according to some embodiments of this application; Figure 6 yes Figure 5 A schematic diagram of the structure of the end cap and the high-temperature resistant insulating component 13 shown in the figure; Figure 7 yes Figure 6 The front view of the end cap and high-temperature resistant insulation component 13 shown; Figure 8 yes Figure 6 Left view of the end cap and high-temperature resistant insulation component 13 shown; Figure 9 This is an exploded view of a battery cell 10 according to other embodiments of this application; Figure 10 yes Figure 9 A schematic diagram of the structure of the first insulating component 12 and the high-temperature resistant insulating component 13 shown in the figure; Figure 11 yes Figure 10 Front view of the first insulating member 12 and the high-temperature resistant insulating member 13 shown in the figure; Figure 12 yes Figure 10 The left view of the first insulating member 12 and the high-temperature resistant insulating member 13 shown.

[0101] The following is for reference. Figures 3-12 A battery cell 10 according to an embodiment of the first aspect of this application is described.

[0102] This application provides an embodiment of a battery cell 10, such as Figure 4 As shown, the battery cell 10 includes: a housing 11, a first insulating member 12, and a high-temperature resistant insulating member 13. A cavity 101 is formed inside the housing 11, and at least one wall of the housing 11 in the first direction Z is a first wall 111. The first insulating member 12 is disposed in the cavity 101 and stacked with the first wall 111. The high-temperature resistant insulating member 13 is disposed between the first wall 111 and the first insulating member 12, and the heat resistance temperature of the high-temperature resistant insulating member 13 is greater than the heat resistance temperature of the first insulating member 12.

[0103] The housing 11 has a cavity 101 for providing a housing space for the electrode assembly 16, and the cavity 101 of the housing 11 is filled with electrolyte. The housing 11 has two sidewalls arranged opposite to each other in the first direction Z, and only one of the two sidewalls may be formed as the first wall 111, or both sidewalls may be formed as the first wall 111.

[0104] The first wall 111 is used to lead out the electrodes of the battery cell 10. Specifically, the first wall 111 is provided with a terminal mounting hole 1111. One end of the terminal 14 of the battery cell 10 passes through the terminal mounting hole 1111 and extends into the cavity 101 to connect with the electrode assembly 16 in the cavity 101. When the housing 11 has one first wall 111, the positive terminal 14 and the negative terminal 14 of the battery cell 10 are located on the same side of the housing 11 in the first direction Z. When the housing 11 has two first walls 111 arranged opposite to each other, the positive terminal 14 and the negative terminal 14 of the battery cell 10 are respectively arranged on opposite sides of the housing 11 in the first direction Z.

[0105] The first insulating member 12 is disposed in the cavity 101 and arranged between the electrode assembly 16 and the first wall 111. The first insulating member 12 is used to fix the electrode assembly 16 and isolate the electrode assembly 16 from the first wall 111.

[0106] In some examples, the first insulating element 12 is a plastic element, for example, the first insulating element 12 is a polyvinyl chloride element or a polypropylene element.

[0107] The first insulating member 12 is adapted to abut against the first wall 111 and the electrode assembly 16 in the first direction Z. At the same time, the first insulating member 12 and the electrode assembly 16 also define an arrangement space for the electrode tab of the electrode assembly 16 to connect with the adapter piece 15.

[0108] The high-temperature resistant insulating component 13 is a component that can maintain good insulation performance even in high-temperature environments. In this embodiment, the heat resistance temperature of the high-temperature resistant insulating component 13 is greater than that of the first insulating component 12. For example, the melting point of the high-temperature resistant insulating component 13 is greater than that of the first insulating component 12.

[0109] In some examples, the difference between the heat resistance temperature of the high-temperature resistant insulating component 13 and the heat resistance temperature of the first insulating component 12 can be greater than or equal to 5°C. For example, the heat resistance temperature of the high-temperature resistant insulating component 13 can be 5°C, 10°C, 15°C, 20°C, 25°C, 30°C, 40°C, 50°C, 60°C, 70°C, 80°C, 100°C or more higher than the heat resistance temperature of the first insulating component 12.

[0110] In some examples, the heat resistance temperature of the high-temperature insulating component 13 is greater than the highest temperature that the battery cell 10 is heated to during thermal runaway testing.

[0111] It should be noted that during the thermal runaway test of the battery cell 10, a heating device is usually used to externally heat the battery cell 10, and the temperature of the battery cell 10 is gradually increased according to the set heating rate. During the heating process, the battery temperature, voltage, and whether there are any external changes such as smoke or bulging are recorded in real time.

[0112] However, the first insulating element 12 in the battery cell 10 has a low melting point. During the heating process of the battery cell 10, the first insulating element 12 is prone to melting and deformation. During the heating process of the battery cell 10, the electrode assembly 16 will expand, and a large amount of gas will be generated inside the battery cell 10. When the battery cell 10 is depressurized, the electrode assembly 16 and the adapter piece 15 will jump up at the moment of depressurization. Since the first insulating element 12 melts and deforms, the adapter piece 15 and the first wall 111 are prone to overlap at the melted and deformed position of the first insulating element 12, causing a short circuit inside the battery cell 10, which in turn causes the thermal runaway test of the battery cell 10 to fail.

[0113] In this embodiment, a high-temperature resistant insulating component 13 is provided between the first insulating component 12 and the first wall 111, and the heat resistance temperature of the high-temperature resistant insulating component 13 is greater than that of the first insulating component 12. When the battery cell 10 is subjected to thermal runaway testing, even if the first insulating component 12 melts and deforms due to excessive temperature during the heating process of the battery cell 10, the high-temperature resistant insulating component 13 can still maintain good shape and insulation performance. It also isolates the first wall 111 and the adapter piece 15 to ensure the insulation performance between the first wall 111 and the adapter piece 15, reduce the probability of the first wall 111 and the adapter piece 15 overlapping, reduce the risk of short circuit between the adapter piece 15 and the first wall 111, reduce the probability of thermal runaway test failure of the battery cell 10 during thermal runaway testing, and reduce the risk of fire and explosion of the battery cell 10 during thermal runaway testing. As a result, the battery cell 10 can complete the thermal runaway test more smoothly, and the data obtained from the thermal runaway test is more accurate and reliable.

[0114] In addition, when the battery cell 10 is operating normally, the high-temperature resistant insulation component 13 can also enhance the stability and safety of the internal structure of the battery cell 10. When the battery cell 10 faces extreme conditions such as high temperature, it can reduce the risk of internal short circuit of the battery cell 10, extend the service life of the battery cell 10, and improve the reliability and stability of the battery cell 10 and the battery device 100.

[0115] In some embodiments of this application, the heat resistance temperature of the high-temperature resistant insulating component 13 is greater than or equal to 240°C.

[0116] For example, the heat resistance temperature of the high-temperature resistant insulating component 13 can be 240℃, 245℃, 250℃, 255℃, 260℃, 265℃, 270℃, 275℃, 280℃, 285℃, 295℃, 305℃, 315℃ and above, etc.

[0117] In some examples, the high-temperature resistant insulation component 13 can be a ceramic insulation component, a mica insulation component, a polyimide insulation component, a glass fiber insulation component, a quartz insulation component, a silicone rubber insulation component, or a polytetrafluoroethylene insulation component.

[0118] In the above technical solution, the heat resistance temperature of the high-temperature resistant insulating component 13 is greater than or equal to 240°C, which can improve the heat resistance temperature of the high-temperature resistant insulating component 13, reduce the probability of the high-temperature resistant insulating component 13 being heated and melted, further reduce the risk of short circuit between the adapter piece 15 and the first wall 111, and reduce the probability of thermal runaway test failure of the battery cell 10 during thermal runaway test.

[0119] In some embodiments of this application, the heat resistance temperature of the high-temperature resistant insulating component 13 is greater than or equal to 280°C.

[0120] For example, the heat resistance temperature of the high-temperature resistant insulating component 13 can be 280℃, 300℃, 320℃, 340℃, 360℃, 380℃, 400℃, 450℃, 500℃, 550℃, 600℃, 700℃, 800℃ and above, etc.

[0121] In the above technical solution, the heat resistance temperature of the high-temperature resistant insulating component 13 is greater than or equal to 280°C, which can further improve the heat resistance temperature of the high-temperature resistant insulating component 13, further reduce the probability of the high-temperature resistant insulating component 13 being heated and melted, further reduce the risk of short circuit between the adapter piece 15 and the first wall 111, and reduce the probability of thermal runaway test failure of the battery cell 10 during thermal runaway test.

[0122] In some embodiments of this application, the high-temperature resistant insulating component 13 is an insulating heat-resistant adhesive.

[0123] Insulating heat-resistant adhesive is an adhesive material that possesses both excellent insulation properties and high-temperature resistance. The high-temperature resistant insulating component 13, made of insulating heat-resistant adhesive, can be easily bonded directly to the battery cell 10. For example, utilizing the adhesive properties of the high-temperature resistant insulating component 13, it can be directly bonded to the first wall 111 or the first insulating component 12. This facilitates the installation and fixation of the high-temperature resistant insulating component 13, reduces assembly difficulty, improves assembly efficiency, and enhances the reliability of the fixed connection of the high-temperature resistant insulating component 13.

[0124] In the above technical solution, the high-temperature resistant insulating component 13 is an insulating heat-resistant adhesive, which can be easily glued directly to the battery cell 10, reducing assembly difficulty, improving assembly efficiency, and improving the reliability of the fixed connection of the high-temperature resistant insulating component 13.

[0125] In some embodiments of this application, the high-temperature resistant insulating component 13 is a polyimide adhesive layer, a polyimide tape, a polyester film tape, or a silicone tape.

[0126] In some examples, the high-temperature resistant insulating component 13 is a polyimide adhesive layer, which is an adhesive layer formed with polyimide as the main component. The polyimide adhesive layer not only withstands high temperatures for a longer period but also has good adhesion, thus enabling the high-temperature resistant insulating component 13 to be reliably bonded to the first wall 111 or the first insulating component 12. In some examples, during assembly, the polyimide adhesive layer can be directly coated onto the surface of the first wall 111 or the first insulating component 12 to form the high-temperature resistant insulating component 13. Alternatively, the adhesive properties of the polyimide adhesive layer can be used to bond a pre-made polyimide adhesive layer sheet to the surface of the first wall 111 or the first insulating component 12. Furthermore, the polyimide adhesive layer can be hot-pressed and fixed to the surface of the first wall 111 or the first insulating component 12 using a hot-pressing process.

[0127] In some examples, the high-temperature resistant insulating component 13 is a polyimide tape, which is a tape made by coating one or both sides of a polyimide film with a high-performance silicone pressure-sensitive adhesive. The polyimide tape not only withstands higher temperatures for longer periods, but also allows the high-temperature resistant insulating component 13 to be reliably adhered to the first wall 111 and / or the first insulating component 12 using single-sided or double-sided tape, improving assembly efficiency and the reliability of the fixed connection of the high-temperature resistant insulating component 13.

[0128] In some examples, the high-temperature resistant insulating component 13 is a polyester film tape, which is a tape made by coating one or both sides of a polyester film as a substrate with an adhesive. The polyester film tape can withstand certain high temperatures and, through single-sided or double-sided tape, can reliably adhere the high-temperature resistant insulating component 13 to the first wall 111 and / or the first insulating component 12, improving assembly efficiency and the reliability of the fixed connection of the high-temperature resistant insulating component 13.

[0129] In some examples, the high-temperature resistant insulating component 13 is a silicone tape, which is a strip material made primarily of silicone. Silicone tape has good heat resistance, can withstand high temperatures, and also possesses excellent insulation properties, effectively blocking current.

[0130] In the above technical solution, the high-temperature resistant insulating component 13 is a polyimide adhesive layer, polyimide tape, polyester film tape or silicone tape. This not only enables the high-temperature resistant insulating component 13 to withstand high temperatures for a longer period of time, but also gives it good adhesion, making it easy to reliably attach the high-temperature resistant insulating component 13 to the first wall 111 or the first insulating component 12, thereby improving assembly efficiency.

[0131] In some embodiments of this application, the high-temperature resistant insulating member 13 is fixed to the surface of the first wall 111 facing the first insulating member 12; and / or, the high-temperature resistant insulating member 13 is fixed to the surface of the first insulating member 12 facing the first wall 111.

[0132] In other words, the high-temperature resistant insulating component 13 can be fixed only on the surface of the first wall 111 facing the first insulating component 12, or it can be fixed only on the surface of the first insulating component 12 facing the first wall 111, or it can be provided on both the surface of the first wall 111 facing the first insulating component 12 and the surface of the first insulating component 12 facing the first wall 111.

[0133] In the above technical solution, the high-temperature resistant insulating component 13 is fixed to the surface of the first wall 111 facing the first insulating component 12. The high-temperature resistant insulating component 13 can directly cover and shield the first wall 111, reducing the probability of the adapter piece 15 overlapping with the first wall 111. Fixing the high-temperature resistant insulating component 13 to the surface of the first insulating component 12 facing the first wall 111 can prevent the adapter piece 15 from passing through the first insulating component 12 and overlapping with the first wall 111, reducing the probability of the adapter piece 15 overlapping with the first wall 111. In addition, it can also improve the stability of the internal structure of the battery cell 10, and the structural layout is reasonable.

[0134] In some embodiments of this application, the battery cell 10 further includes: a terminal post 14, an adapter plate 15, and an electrode assembly 16. The terminal post 14 is disposed through the first wall 111, and the adapter plate 15 and the electrode assembly 16 are both disposed in the cavity 101. The terminal post 14 is connected to the electrode assembly 16 through the adapter plate 15. The high-temperature resistant insulating member 13 is directly opposite the adapter plate 15 in the first direction Z.

[0135] The electrode assembly 16 includes an electrode body and a tab connected to the electrode body. The tab is connected between the adapter plate 15 and the electrode body, and the tab and the adapter plate 15 can be welded together.

[0136] In some examples, the high-temperature resistant insulating component 13 is a sheet-like structure perpendicular to the first direction Z, and the adapter piece 15 is also a sheet-like structure perpendicular to the first direction Z. In the first direction Z, the adapter piece 15 and the high-temperature resistant insulating component 13 are arranged opposite to each other so that the high-temperature resistant insulating component 13 can effectively block the connection between the adapter piece 15 and the first wall 111, further reducing the probability of the adapter piece 15 overlapping with the first wall 111 and improving the overall stability and service life of the battery cell 10.

[0137] In the above technical solution, the high-temperature resistant insulating component 13 and the adapter piece 15 are directly opposite each other in the first direction Z, which can effectively block the high-temperature resistant insulating component 13 between the adapter piece 15 and the first wall 111, further reducing the probability of the adapter piece 15 and the first wall 111 overlapping, and improving the overall stability and service life of the battery cell 10.

[0138] In some embodiments of this application, the projection of the high-temperature resistant insulating member 13 on the first wall 111 completely covers the projection of the adapter piece 15 on the first wall 111.

[0139] In other words, both the high-temperature resistant insulating component 13 and the adapter piece 15 are projected onto the surface of the first wall 111 along the first direction Z, and the projection of the adapter piece 15 onto the first wall 111 is completely within the projection of the high-temperature resistant insulating component 13. In this way, no matter how the adapter piece 15 moves, the high-temperature resistant insulating component 13 can block the connection between the adapter piece 15 and the first wall 111, further effectively preventing the adapter piece 15 from overlapping with the first wall 111 and reducing the probability of internal short circuits in the battery cell 10.

[0140] In the above technical solution, the projection of the high-temperature resistant insulating component 13 on the first wall 111 completely covers the projection of the adapter piece 15 on the first wall 111. Thus, the high-temperature resistant insulating component 13 can always block the adapter piece 15 and the first wall 111, further effectively preventing the adapter piece 15 from overlapping with the first wall 111 and reducing the probability of internal short circuit in the battery cell 10.

[0141] In some embodiments of this application, in the width direction of the first wall 111 (e.g.) Figure 5 and Figure 6 In the second direction (Y) shown, the width of the high-temperature resistant insulating member 13 is less than or equal to the width of the first wall 111.

[0142] The width dimension of the high-temperature resistant insulating component 13 refers to the maximum distance between its two edges in the second direction Y. The width dimension of the first wall 111 refers to the maximum distance between its two edges in the second direction Y. For example, if the first wall 111 is a rectangular plate, then the width dimension of the first wall 111 is simply the width of the first wall 111.

[0143] In some examples, the first direction Z intersects the second direction Y; in some specific examples, the first direction Z and the second direction Y are perpendicular to each other.

[0144] In the above technical solution, the width of the high-temperature resistant insulating component 13 is less than or equal to the width of the first wall 111. This not only effectively isolates the high-temperature resistant insulating component 13 between the adapter piece 15 and the first wall 111, effectively reducing the risk of short circuit due to overlap between the adapter piece 15 and the first wall 111, but also controls the size of the high-temperature resistant insulating component 13, avoiding space waste or installation inconvenience caused by the high-temperature resistant insulating component 13 being too large.

[0145] In some embodiments of this application, the ratio of the width of the high-temperature resistant insulating member 13 to the width of the first wall 111 is greater than or equal to 0.8 and less than or equal to 0.99.

[0146] For example, the ratio of the width of the high-temperature resistant insulating component 13 to the width of the first wall 111 can be 0.8, 0.81, 0.82, 0.84, 0.85, 0.87, 0.88, 0.9, 0.92, 0.93, 0.95, 0.96, 0.97 or 0.98, etc.

[0147] It should be noted that when the ratio of the width of the high-temperature resistant insulating component 13 to the width of the first wall 111 is too small, for example, less than 0.8, the high-temperature resistant insulating component 13 cannot effectively cover the first wall 111 or the adapter piece 15. When the ratio of the width of the high-temperature resistant insulating component 13 to the width of the first wall 111 is too large, for example, greater than 1, the width of the high-temperature resistant insulating component 13 is too large, which will increase the amount of material used in the high-temperature resistant insulating component 13 and increase the installation space of the high-temperature resistant insulating component 13, increase the space occupied in the battery cell 10, and affect the energy density of the battery cell 10.

[0148] In the above technical solution, by making the ratio of the width of the high-temperature resistant insulating component 13 to the width of the first wall 111 greater than or equal to 0.8 and less than or equal to 0.99, the width of the high-temperature resistant insulating component 13 can be kept within a suitable range. Under the premise of effectively isolating the adapter piece 15 from the first wall 111 and improving the overall stability of the battery cell 10, the structure of the high-temperature resistant insulating component 13 is made compact and reasonable, reducing the space occupied by the high-temperature resistant insulating component 13 in the housing 11 of the battery cell 10, increasing the energy density of the battery cell 10, and reducing the cost.

[0149] In some embodiments of this application, in the length direction of the first wall 111 (e.g.) Figure 5 and Figure 6 On the third direction X shown, the length of the high-temperature resistant insulating component 13 is greater than or equal to the length of the adapter piece 15.

[0150] The length dimension of the high-temperature resistant insulating component 13 refers to the distance between its two ends in the third direction X. The length dimension of the adapter piece 15 refers to the maximum distance between the two ends of a single adapter piece 15 in the third direction X.

[0151] In some examples, the third direction X intersects both the first direction Z and the second direction Y. In some specific examples, the third direction X, the first direction Z, and the second direction Y are all perpendicular to each other.

[0152] In the above technical solution, the length of the high-temperature resistant insulating component 13 is greater than or equal to the length of the adapter piece 15. On the one hand, this allows the high-temperature resistant insulating component 13 to more fully cover the adapter piece 15. Regardless of how the adapter piece 15 changes in the length direction, the high-temperature resistant insulating component 13 can effectively protect the adapter piece 15, reduce the risk of short circuit caused by the adapter piece 15 contacting the first wall 111, improve the stability and reliability of the battery cell 10, reduce potential faults, and thus extend the service life of the battery cell 10.

[0153] In some embodiments of this application, the ratio of the length of the high-temperature resistant insulating member 13 to the length of the adapter piece 15 is less than or equal to 1.1.

[0154] For example, the ratio of the length of the high-temperature resistant insulating component 13 to the length of the adapter piece 15 can be 1.01, 1.02, 1.03, 1.04, 1.05, 1.06, 1.07, 1.08, 1.09 or 1.1, etc.

[0155] It should be noted that when the ratio of the length of the high-temperature resistant insulating component 13 to the length of the adapter piece 15 is too small, for example, less than 1, the high-temperature resistant insulating component 13 cannot effectively cover the adapter piece 15. When the ratio of the length of the high-temperature resistant insulating component 13 to the length of the adapter piece 15 is too large, for example, greater than 1.1, the length of the high-temperature resistant insulating component 13 is too large, which will increase the amount of material used in the high-temperature resistant insulating component 13 and increase the installation space of the high-temperature resistant insulating component 13, thus increasing the space occupied within the battery cell 10.

[0156] In the above technical solution, by making the ratio of the length of the high-temperature resistant insulating component 13 to the length of the adapter piece 15 less than or equal to 1.1, the length of the high-temperature resistant insulating component 13 can be within a suitable range, so that the high-temperature resistant insulating component 13 can fully cover the adapter piece 15. Under conditions such as high temperature operation or thermal runaway testing of the battery cell 10, it can reliably prevent the adapter piece 15 from short-circuiting with the first wall 111 due to abnormal movement, thereby improving the operational stability of the battery cell 10. It can also reduce the amount of material used in the high-temperature resistant insulating component 13 and reduce the space occupied by the high-temperature resistant insulating component 13 in the length direction of the first wall 111, making the internal structure of the battery cell 10 more compact and reasonable.

[0157] In some embodiments of this application, the thickness of the high-temperature resistant insulating member 13 in the first direction Z is greater than or equal to 20 μm and less than or equal to 100 μm.

[0158] For example, the thickness of the high-temperature resistant insulating component 13 in the first direction Z can be 20μ, 25μ, 30μ, 35μ, 40μ, 45μ, 50μ, 55μ, 60μ, 65μ, 70μ, 75μ, 80μ, 85μ, 90μ, 95μ or 100μ, etc.

[0159] It should be noted that when the thickness of the high-temperature resistant insulation component 13 is too thin, for example, less than 20 μm, its insulation and barrier capabilities will be insufficient. When the battery cell 10 operates in a high-temperature environment, the high-temperature resistant insulation component 13 will be unable to effectively block the adapter piece 15 from the first wall 111, which may easily lead to a short circuit risk and fail to ensure the safety of the internal circuitry of the battery cell 10. When the thickness of the high-temperature resistant insulation component 13 is too thick, for example, greater than 100 μm, it will occupy too much space inside the battery cell 10, affecting the energy density of the battery cell 10, and will also increase costs and affect the size and normal assembly of other components inside the battery cell 10.

[0160] In the above technical solution, the thickness of the high-temperature resistant insulating component 13 is greater than or equal to 20 μm, which enables it to have sufficient insulation barrier performance. When the battery cell 10 operates in a high-temperature environment, such as during thermal runaway testing, it can effectively prevent the adapter piece 15 from accidentally contacting the first wall 111, reducing the risk of short circuits inside the battery cell 10. Simultaneously, the thickness of the high-temperature resistant insulating component 13 is less than or equal to 100 μm, which reduces the space occupied by the high-temperature resistant insulating component 13, making the internal structure of the battery cell 10 more compact and reasonable, and also reducing costs.

[0161] In some embodiments of this application, the thickness of the high-temperature resistant insulating element 13 is less than or equal to 50 μm.

[0162] For example, the thickness of the high-temperature resistant insulating component 13 in the first direction Z can be 20μ, 22μ, 26μ, 28μ, 32μ, 34μ, 36μ, 38μ, 42μ, 44μ, 46μ, 48μ or 50μ, etc.

[0163] In the above technical solution, the thickness of the high-temperature resistant insulating component 13 is less than or equal to 50μm. This allows the high-temperature resistant insulating component 13 to have sufficient insulation barrier performance while further reducing the amount of material used, lowering the cost, reducing the space occupied by the high-temperature resistant insulating component 13 in the battery cell 10, and improving the energy density of the battery cell 10.

[0164] In some embodiments of this application, one of the walls of the housing 11 in the first direction Z is formed as a first wall 111. The first wall 111 is provided with two pole posts 14 arranged at intervals along the length direction of the first wall 111. The number of high temperature resistant insulating parts 13 and the number of adapter pieces 15 are both two and correspond one-to-one with the two pole posts 14.

[0165] In other words, the two terminals 14 of the battery cell 10 are arranged on the same side of the housing 11. This facilitates external wiring connections, makes the wiring neater and simpler, and reduces the risk of failure caused by messy wiring. At the same time, it helps to unify the planning of the installation space of the battery cell 10 in the equipment, optimizes the overall layout, and makes the use, maintenance, and subsequent inspection of the battery cell 10 more convenient.

[0166] Two terminals 14, two adapter pieces 15, and two high-temperature resistant insulating components 13 are arranged in a one-to-one correspondence. When the battery cell 10 is operating, especially under high temperature conditions, each high-temperature resistant insulating component 13 can specifically block the corresponding adapter piece 15, effectively reducing the risk of short circuit caused by abnormal movement of the adapter piece 15 and contact with other components, ensuring the stability of the internal circuit of the battery cell 10, and achieving precise protection for the corresponding adapter piece 15.

[0167] In the above technical solution, two pole posts 14 are arranged at intervals on the first wall 111, and two high-temperature resistant insulating components 13 are arranged in a one-to-one correspondence with the two pole posts 14 and the two adapter pieces 15. This allows each high-temperature resistant insulating component 13 to specifically block the corresponding adapter piece 15, effectively reducing the risk of short circuit caused by abnormal movement of the adapter piece 15 and contact with other components.

[0168] In some embodiments of this application, a pressure relief structure 174 is provided on the first wall 111, and two high-temperature resistant insulating members 13 are respectively arranged on both sides of the pressure relief structure 174 in the length direction of the first wall 111.

[0169] When an abnormal situation such as thermal runaway occurs in the battery cell 10, causing a sudden increase in internal pressure, the pressure relief structure 174 can release the pressure in time to ensure the safe operation of the battery cell 10.

[0170] Two high-temperature resistant insulating components 13 are respectively arranged on both sides of the pressure relief structure 174 along the length of the first wall 111. Two terminals 14 are respectively arranged on both sides of the pressure relief structure 174 along the length of the first wall 111. Two adapter plates 15 are respectively arranged on both sides of the pressure relief structure 174 along the length of the first wall 111. In this way, during the pressure relief process of the pressure relief structure 174, the probability of high-temperature gas, splashes, etc. impacting the adapter plates 15, terminals 14, and high-temperature resistant insulating components 13 can be reduced, thereby reducing the risk of short circuits and other faults. This helps to improve the stability and reliability of the battery cell 10 under extreme operating conditions, reduce safety hazards, and extend the service life of the battery cell 10.

[0171] In addition, by concentrating the two pole posts 14 and the pressure relief structure 174 on the first wall 111, the internal space of the battery device 100 can be utilized more compactly and rationally.

[0172] In the above technical solution, a pressure relief structure 174 is provided on the first wall 111. The pressure relief structure 174 can release pressure in time to ensure the safe operation of the battery cell 10. Two high-temperature resistant insulating components 13 are respectively arranged on both sides of the pressure relief structure 174 along the length of the first wall 111. This can reduce the probability of high-temperature gas and splashes impacting the adapter plate 15, the terminal post 14 and the high-temperature resistant insulating component 13 during the pressure relief process, reduce the risk of short circuits and other faults, and help improve the stability and reliability of the battery cell 10 under extreme operating conditions.

[0173] In some embodiments of this application, the housing 11 includes a main housing 112 and an end cap, the main housing 112 being open on at least one side in a first direction Z, the end cap sealing the open side of the main housing 112 and cooperating with the main housing 112 to define a cavity 101, and at least one end cap being formed as a first wall 111.

[0174] In some examples, the housing 11 can be cuboid in shape, or it can be cylindrical in shape.

[0175] In some examples, the main housing 112 can be formed with one end open and the other end closed in the first direction Z, with one end cap sealing the open end of the main housing 112. The main housing 112 can also be formed with both ends open in the first direction Z, with two end caps sealing the two open ends of the main housing 112 respectively. This embodiment, by making at least one side of the main housing 112 open in the first direction Z, facilitates the installation and layout of the internal components of the battery cell 10, and makes it easier to repair, replace, or upgrade the internal components, thereby reducing maintenance costs and difficulty.

[0176] In some examples, the electrode assembly 16 is disposed within the housing 11. The electrode assembly 16 may include multiple electrodes arranged in layers, or the electrode assembly 16 may be formed by winding a positive electrode, a negative electrode, and a separator. The wound electrode assembly 16 may be cylindrical, and the cross-section of the wound electrode assembly 16 may be rectangular with rounded corners.

[0177] In some embodiments, the battery cell 10 includes a top cover assembly A, a main housing 112, an electrode assembly 16, and an insulating film 177. The main housing 112 defines a cavity 101 that is open on one side in a first direction Z. The top cover assembly A covers the open side of the main housing 112. The electrode assembly 16 is disposed within the cavity 101. The insulating film 177 covers the outside of the electrode assembly 16. An adapter piece 15 is disposed on the side of the electrode assembly 16 facing the top cover assembly A and is connected to the tab of the electrode assembly 16.

[0178] like Figure 5As shown, the top cover assembly A includes: an end cover, a first insulating component 12, a high-temperature resistant insulating component 13, an electrode post 14, an adapter piece 15, a second insulating component 172, a sealing ring 171, a riveting block 173, a pressure relief structure 174, a protective piece 175, and a sealing pin 176. Specifically, the end cover is arranged perpendicular to the first direction Z, and the end cover has two electrode post mounting holes 1111 and one explosion-proof valve mounting hole 1112 arranged at intervals along the third direction X. The explosion-proof valve mounting hole 1112 is arranged between the two electrode post mounting holes 1111, and an injection hole 1113 is also formed on the end cover.

[0179] The first insulating member 12 is arranged on the side of the end cap facing the electrode assembly 16. Two first through holes 121 are formed on the first insulating member 12 at intervals. The two first through holes 121 are respectively opposite to and connected to the two electrode mounting holes 1111. The first insulating member 12 also has a first through hole 122, which is opposite to and connected to the liquid injection hole 1113.

[0180] There are two poles 14, one for the positive pole and one for the negative pole. There are also two adapter pieces 15, two riveting blocks 173, and two second insulating components 172, each corresponding to one pole 14. The pole 14 is located within the pole mounting hole 1111. The riveting block 173 is located on the side of the end cap away from the electrode assembly 16. The riveting block 173 is annular and is fitted onto the outside of the pole 14, providing a fixed connection. The second insulating component 172 is also annular and located on the side of the end cap away from the electrode assembly 16, positioned between the pole 14 and the end cap. Furthermore, a sealing ring 171 is provided between the pole 14 and the periphery of the pole mounting hole 1111.

[0181] The adapter piece 15 has a protruding structure that protrudes towards the electrode post 14. The protruding structure passes through the first through hole 121 and extends into the electrode post mounting hole 1111, where it is connected and fixed to the electrode post 14. Furthermore, a sealing ring 171 is provided around the periphery of the first through hole 121. The sealing ring 171 is located on the side of the first insulating member 12 facing the electrode assembly 16 and abuts against the first insulating member 12 and the adapter piece 15.

[0182] The pressure relief structure 174 is installed at the explosion-proof valve mounting hole 1112. The protective plate 175 is located on the side of the pressure relief structure 174 away from the electrode assembly 16 and covers the pressure relief structure 174. At least a portion of the sealing pin 176 is sealed in the injection hole 1113.

[0183] In the above technical solution, by making the main shell 112 open on at least one side in the first direction Z and sealing the main shell 112 with an end cap, the shell 11 is divided into two parts. This facilitates the installation and layout of the internal components of the battery cell 10, and makes it easier to repair, replace or upgrade the internal components, thereby reducing maintenance costs and difficulty. At the same time, forming the end cap as the first wall 111 facilitates the installation of components such as the terminal post 14, the pressure relief structure 174 and the high-temperature resistant insulating component 13, optimizing the positional relationship between the various components of the battery cell 10, facilitating installation, and resulting in a compact structure.

[0184] Secondly, embodiments of this application also provide a battery device 100, including a battery cell 10 from any of the above embodiments.

[0185] In some examples, the battery device 100 further includes a housing 20, which includes a main body 21 and a cover 22. The main body 21 is a cuboid shape with an open top, and the cover 22 covers the top of the main body 21. The periphery of the cover 22 is fastened to the periphery of the main body 21 by fasteners. Specifically, the periphery of the open opening of the main body 21 has a plurality of first connecting holes, which are spaced apart circumferentially along the main body 21. The periphery of the cover 22 has an outwardly extending flange, which can extend into a ring shape circumferentially along the cover 22. The flange has a plurality of second connecting holes, which are directly opposite each other in the first direction Z. The cover 22 is fastened to the main body 21 by fasteners passing through the first and second connecting holes.

[0186] Furthermore, a sealing element is provided between the cover 22 and the box body 21. The sealing element extends in a ring shape along the circumference of the cover 22 and abuts against the cover 22 and the box body 21.

[0187] In some examples, the enclosure 20 is equipped with a partition beam that divides the space within the enclosure 20 into a battery cavity and an electrical cavity. Multiple battery cells 10 are arranged within the battery cavity, for example, by stacking multiple battery cells 10 along the length and width directions of the enclosure 20. Other electrical components, such as high- and low-voltage distribution boxes, are arranged within the electrical cavity.

[0188] In some examples, the battery device 100 also includes a heat exchanger disposed within the housing 20 and between the inner wall of the housing 20 and the battery cell 10, for heat exchange through contact with the battery cell 10. The heat exchanger may also be disposed on the outside of the housing 20, allowing heat exchange through contact with the battery cell 10 via the bottom wall of the housing 20. Additionally, the heat exchanger may be disposed between adjacent battery cells 10.

[0189] In the above technical solution, since the battery device 100 is provided with the aforementioned battery cell 10, and since the battery cell 10 is provided with a high-temperature resistant insulating member 13 between the first wall 111 and the first insulating member 12, and the heat resistance temperature of the high-temperature resistant insulating member 13 is greater than that of the first insulating member 12, the high-temperature resistant insulating member 13 can be isolated between the first wall 111 and the adapter piece 15 in the cavity 101, thereby improving the insulation performance between the first wall 111 and the adapter piece 15, reducing the risk of short circuit between the adapter piece 15 and the first wall 111, reducing the probability of thermal runaway test failure of the battery cell 10 during thermal runaway test, reducing the risk of fire and explosion of the battery cell 10 during thermal runaway test, and improving the overall performance of the battery device 100.

[0190] Thirdly, embodiments of this application also provide an electrical device 1, including the battery device 100 of any of the above embodiments.

[0191] In the above technical solution, since the power device 1 is equipped with the battery device 100, a high-temperature resistant insulating component 13 is provided between the first wall 111 and the first insulating component 12 of the battery cell 10, and the heat resistance temperature of the high-temperature resistant insulating component 13 is greater than that of the first insulating component 12. The high-temperature resistant insulating component 13 can be isolated between the first wall 111 and the adapter piece 15 in the cavity 101, so as to improve the insulation performance between the first wall 111 and the adapter piece 15, reduce the risk of short circuit between the adapter piece 15 and the first wall 111, reduce the probability of thermal runaway test failure of the battery cell 10 during thermal runaway test, and reduce the risk of fire and explosion of the battery cell 10 during thermal runaway test, thereby improving the overall performance of the power device 1.

[0192] The following will refer to Figures 2-12 This application describes a battery device 100 according to a specific embodiment.

[0193] Reference Figure 2 The battery assembly 100 includes a housing 20 and multiple battery cells 10. The housing 20 includes a main body 21 and a cover 22. The main body 21 is a rectangular parallelepiped with an open top. The cover 22 covers the top of the main body 21, and the periphery of the cover 22 is fastened to the periphery of the main body 21 by fasteners. The multiple battery cells 10 are stacked along the length of the housing 20 to form a battery cell assembly, and the multiple battery cell assemblies are arranged sequentially along the width of the housing 20.

[0194] like Figures 3-5As shown, the battery cell 10 includes a main shell 112, a top cover assembly A, and an electrode assembly 16. The top cover assembly A includes an end cap. The main shell 112 and the end cap constitute the housing 11 of the battery cell 10. The housing 11 is a cuboid box shape. The main shell 112 is open on one side in the first direction Z. The end cap covers the open side of the main shell 112. Furthermore, the main shell 112 and the end cap can both be made of aluminum to reduce the weight of the housing 11.

[0195] like Figure 4 As shown, the electrode assembly 16 is a wound cell, meaning that the electrode assembly 16 is formed by winding a positive electrode plate, a negative electrode plate, and a separator. The outer side of the electrode assembly 16 is wrapped with an insulating film 177. Two tabs are formed on the side of the electrode assembly 16 facing the end cap, and the two tabs are respectively connected to two adapter pieces 15.

[0196] like Figure 5 As shown, the end cap has two pole mounting holes 1111 and one explosion-proof valve mounting hole 1112 arranged at intervals along the third direction X. The explosion-proof valve mounting hole 1112 is arranged between the two pole mounting holes 1111. The positive pole 14 and the negative pole 14 are respectively inserted into the two pole mounting holes 1111. The pressure relief structure 174 is located at the explosion-proof valve mounting hole 1112. The protective plate 175 covers the side of the pressure relief structure 174 that is away from the electrode assembly 16.

[0197] The first insulating member 12 is arranged on the side of the end cap facing the electrode assembly 16. Two first through holes 121 are formed on the first insulating member 12 at intervals. The two first through holes 121 are respectively aligned with and connected to the two electrode mounting holes 1111. The adapter piece 15 has a protruding structure that protrudes towards the electrode 14. The protruding structure passes through the first through holes 121 and extends into the electrode mounting holes 1111, and is connected and fixed to the electrode 14.

[0198] Furthermore, the top cover assembly A also includes two high-temperature resistant insulating components 13 arranged at intervals along the length of the end cover, with each of the two high-temperature resistant insulating components 13 corresponding to one of the two adapter pieces 15.

[0199] The high-temperature resistant insulating component 13 can be disposed on the surface of the end cap facing the first insulating component 12, and can also be disposed on the surface of the first insulating component 12 facing the end cap. The heat resistance temperature of the high-temperature resistant insulating component 13 is greater than or equal to 240℃. The high-temperature resistant insulating component 13 can be an insulating heat-resistant adhesive, specifically, it can be a polyimide adhesive, or a tape or silicone tape whose main components are polyimide adhesive and polyester film. In this way, the high-temperature resistant insulating component 13 can be adhered and fixed to the surface of the end cap or the first insulating component 12 by adhesive application.

[0200] Furthermore, the projection of the adapter piece 15 onto the end cap is entirely inside the projection of the high-temperature resistant insulating member 13. Specifically, in the length direction of the end cap (e.g., Figure 5 In the third direction (X) shown, the length of the high-temperature resistant insulating component 13 is greater than or equal to the length of the adapter piece 15, and the ratio of the length of the high-temperature resistant insulating component 13 to the length of the adapter piece 15 is less than or equal to 1.1. In the width direction of the end cap (e.g.) Figure 5 In the second direction (Y) shown, the width of the high-temperature resistant insulating member 13 is smaller than the width of the end cap, and the ratio of the width of the high-temperature resistant insulating member 13 to the width of the end cap is greater than or equal to 0.8 and less than or equal to 0.99. In the thickness direction of the end cap (first direction Z), the projection on the first wall 111 can completely cover the projection of the adapter piece 15 on the first wall 111.

[0201] Furthermore, in the thickness direction of the end cap (e.g.) Figure 5 As shown in the first direction Z), the thickness of the high-temperature resistant insulating component 13 is greater than or equal to 20 μm and less than or equal to 100 μm, so that the battery cell 10 can ensure good insulation and protection under various operating conditions.

[0202] In the above embodiment, a high-temperature resistant insulating component 13 is provided between the first insulating component 12 and the end cap of the battery cell 10. The heat resistance temperature of the high-temperature resistant insulating component is greater than or equal to 240°C. When the battery cell 10 is operating in a high-temperature environment, for example, when the battery cell 10 is subjected to a thermal runaway test, when the first insulating component 12 melts and deforms due to excessive temperature, the high-temperature resistant insulating component 13 can still maintain good shape and insulation performance. It is also isolated between the end cap and the adapter piece 15 to ensure the insulation performance between the end cap and the adapter piece 15, reduce the probability of overlap between the end cap and the adapter piece 15, reduce the risk of short circuit between the adapter piece 15 and the end cap, reduce the probability of thermal runaway test failure of the battery cell 10 during the thermal runaway test, reduce the risk of fire and explosion of the battery cell 10 during the thermal runaway test, and thus increase the probability that the battery cell 10 can successfully complete the thermal runaway test.

[0203] In short, the battery cell 10 of the above embodiment can reduce the risk of fire and explosion of the battery cell 10 when the battery cell 10 is subjected to thermal runaway test because the first insulating member 12 melts, causing the adapter piece 15 to overlap with the end cover, resulting in a short circuit inside the battery cell 10.

[0204] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell (10), characterized in that, include: A housing (11) having a cavity (101) formed therein, and at least one wall of the housing (11) in a first direction (Z) being a first wall (111); The first insulating element (12) is disposed in the cavity (101) and stacked with the first wall (111); A high-temperature resistant insulating component (13) is disposed between the first wall (111) and the first insulating component (12), and the heat resistance temperature of the high-temperature resistant insulating component (13) is greater than that of the first insulating component (12).

2. The battery cell (10) according to claim 1, characterized in that, The heat resistance temperature of the high-temperature resistant insulating component (13) is greater than or equal to 240°C.

3. The battery cell (10) according to claim 2, characterized in that, The heat resistance temperature of the high-temperature resistant insulating component (13) is greater than or equal to 280°C.

4. The battery cell (10) according to claim 1, characterized in that, The high-temperature resistant insulating component (13) is an insulating heat-resistant adhesive.

5. The battery cell (10) according to claim 4, characterized in that, The high-temperature resistant insulating component (13) is a polyimide adhesive layer, polyimide tape, polyester film tape, or silicone tape.

6. The battery cell (10) according to claim 1, characterized in that, The high-temperature resistant insulating component (13) is fixed to the surface of the first wall (111) facing the first insulating component (12); and / or, The high-temperature resistant insulating component (13) is fixed to the side surface of the first insulating component (12) facing the first wall (111).

7. The battery cell (10) according to any one of claims 1-6, characterized in that, Also includes: The device comprises an electrode post (14), an adapter plate (15), and an electrode assembly (16). The electrode post (14) is inserted through the first wall (111). The adapter plate (15) and the electrode assembly (16) are both disposed within the cavity (101), and the electrode post (14) is connected to the electrode assembly (16) through the adapter plate (15). The high-temperature resistant insulating component (13) and the adapter piece (15) are directly opposite each other in the first direction (Z).

8. The battery cell (10) according to claim 7, characterized in that, The projection of the high-temperature resistant insulating component (13) on the first wall (111) completely covers the projection of the adapter piece (15) on the first wall (111).

9. The battery cell (10) according to claim 8, characterized in that, In the width direction of the first wall (111), the width dimension of the high-temperature resistant insulating member (13) is less than or equal to the width dimension of the first wall (111).

10. The battery cell (10) according to claim 9, characterized in that, The ratio of the width of the high-temperature resistant insulating component (13) to the width of the first wall (111) is greater than or equal to 0.8 and less than or equal to 0.

99.

11. The battery cell (10) according to claim 8, characterized in that, In the length direction of the first wall (111), the length dimension of the high temperature resistant insulating member (13) is greater than or equal to the length dimension of the adapter piece (15).

12. The battery cell (10) according to claim 11, characterized in that, The ratio of the length of the high-temperature resistant insulating component (13) to the length of the adapter piece (15) is less than or equal to 1.

1.

13. The battery cell (10) according to any one of claims 1-6, characterized in that, In the first direction (Z), the thickness of the high-temperature resistant insulating component (13) is greater than or equal to 20 μm and less than or equal to 100 μm.

14. The battery cell (10) according to claim 13, characterized in that, The thickness of the high-temperature resistant insulating component (13) is less than or equal to 50 μm.

15. The battery cell (10) according to claim 7, characterized in that, One of the walls of the housing (11) in the first direction (Z) is formed as the first wall (111). The first wall (111) is provided with two pole posts (14) arranged at intervals along the length direction of the first wall (111). The number of the high-temperature resistant insulating parts (13) and the number of the adapter pieces (15) are both two and correspond one-to-one with the two pole posts (14).

16. The battery cell (10) according to claim 15, characterized in that, The first wall (111) is provided with a pressure relief structure (174), and the two high-temperature resistant insulating components (13) are respectively arranged on both sides of the pressure relief structure (174) in the length direction of the first wall (111).

17. The battery cell (10) according to claim 1, characterized in that, The housing (11) includes a main housing (112) and an end cap, the main housing (112) being open on at least one side in the first direction (Z), the end caps covering the open side of the main housing (112) and cooperating with the main housing (112) to define the cavity (101), and at least one of the end caps being formed as the first wall (111).

18. A battery device (100), characterized in that, Includes the battery cell (10) according to any one of claims 1-17.

19. An electrical appliance (1), characterized in that, Includes the battery device (100) as described in claim 18.

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