Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device.The battery device comprises a box body, a battery module and a pressing strip assembly, the battery module comprising a plurality of battery monomers is located in a containing cavity of the box body, and at least part of the battery monomers are arranged in the first direction and arranged on the outer sides of the battery monomers arranged in the first direction; a belt body in the pressing strip assembly is connected to an insulating pressing strip, the insulating pressing strip is located between the belt body and the single battery, and an insulating layer covers the belt body and is connected with the belt body and the insulating pressing strip. In the structure, the insulating layer covers the belt body and is connected with the belt body and the insulating pressing strip, so that the belt body is not easy to be directly exposed in the accommodating cavity, the creepage distance between the belt body and the battery monomer is increased, cooling liquid, electrolyte and the like leaked from the box body are not easy to flow onto the belt body, the possibility of short circuit between the belt body and the battery monomer is reduced, and the service life of the battery is prolonged. And the reliability of the battery device is improved.

Description

Technical Field

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

[0002] Battery devices have advantages such as high specific energy and high power density, and are widely used in electronic devices and transportation vehicles, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships and power tools.

[0003] As the application fields of battery devices continue to expand, how to improve the reliability of battery devices is receiving increasing attention from those skilled in the art. Utility Model Content

[0004] In view of the above problems, this application provides a battery device and an electrical device, the battery device having good reliability.

[0005] In a first aspect, some embodiments of this application provide a battery device, which includes a housing, a pressure strip assembly, and a plurality of battery cells. The housing forms a cavity; the plurality of battery cells are located in the cavity, and at least some of the battery cells are arranged along a first direction; the pressure strip assembly extends along the first direction and is disposed outside the plurality of battery cells arranged along the first direction. The pressure strip assembly includes a strip body, an insulating pressure strip, and an insulating layer. The strip body is connected to the insulating pressure strip, the insulating pressure strip is located between the strip body and the battery cells, and the insulating layer covers the strip body and is connected to the strip body and the insulating pressure strip.

[0006] In the above structure, since the insulating layer covers the belt and is connected to the belt and the insulating strip, the belt is not easily exposed directly in the cavity. This not only increases the creepage distance between the belt and the battery cell, but also makes it difficult for leaked coolant, electrolyte, etc. in the box to flow onto the belt, reducing the possibility of short circuit between the belt and the battery cell, which is beneficial to improving the reliability of the battery device.

[0007] According to some embodiments of the present application, the battery device has an insulating strip with a groove, and at least a portion of the strip is located in the groove. By positioning at least a portion of the strip in the groove, the strip can be positioned on the insulating strip by the groove, which improves the reliability of the connection between the strip and the insulating strip, reduces the possibility of misalignment between the strip and the insulating strip, and improves the stability of the strip assembly in use.

[0008] According to some embodiments of the present application, the battery device includes an insulating layer comprising a cover portion and a connecting portion connected to each other. A strip body has a first surface located on the side of the strip body facing the groove opening. The cover portion covers the first surface, and the connecting portion is connected to an insulating strip. By covering the first surface with the cover portion, the first surface is effectively contained, allowing the cover portion in the insulating layer to separate the first surface from the coolant or electrolyte in the cavity, thus reducing the possibility of contact between the first surface and the coolant or electrolyte in the cavity.

[0009] According to some embodiments of the present application, the battery device has at least a portion of the connecting part connected to the inner wall of the groove, so that the connecting part can seal the space where the belt is located.

[0010] According to some embodiments of the present application, the battery device has two opposing second surfaces, a first surface connected between the two second surfaces, and at least a portion of the connecting portion is sandwiched between the inner wall of the groove and the second surface. By sandwiching at least a portion of the connecting portion between the inner wall of the groove and the second surface, the connecting portion can better seal the gap between the belt and the inner wall of the groove, which helps to reduce the possibility of coolant or electrolyte entering the space where the belt is placed.

[0011] According to some embodiments of the present application, the battery device has at least a portion of the connecting portion connected to the area outside the slot of the insulating strip, so that the insulating layer can separate the space where the strip is located from the cavity.

[0012] According to some embodiments of the present application, the thickness of the strip is less than the depth of the groove along the orientation of the groove. The connecting part includes a first part and a second part. The second part is connected between the first part and the covering part. The second part is connected to the inner wall of the groove. The first part extends out of the groove and is connected to the area where the insulating strip is located outside the groove, so that the space in the groove where the strip is located can be well separated from the cavity by the insulating layer.

[0013] According to some embodiments of the present application, the groove opening is disposed opposite to the battery cell, which is beneficial to increasing the creepage distance between the strip located in the groove and the battery cell, and thus improving the reliability of the battery device.

[0014] According to some embodiments of the present application, the pressure strip assembly further includes a buffer member connected to the side of the insulating layer facing away from the battery cell. The buffer member can absorb the force transmitted from the housing, reducing the impact and bumps on the pressure strip assembly.

[0015] According to some embodiments of the present application, the thickness of the strip is less than the depth of the groove along the groove opening direction. The buffer is disposed in the groove and part of the buffer extends out of the groove along the groove opening direction. This not only allows the buffer to be positioned with the insulating strip through the groove, which helps to reduce the possibility of misalignment between the buffer and the insulating strip, but also allows part of the buffer to abut against the housing, so that the strip assembly can abut against the housing.

[0016] According to some embodiments of this application, the battery device includes a housing and a bottom protective plate. The housing forms a cavity with an opening, and the bottom protective plate covers the opening. The bottom protective plate is located on the side of the buffer away from the insulating layer.

[0017] According to some embodiments of this application, the battery device includes a housing and electrode terminals disposed on the housing, the electrode terminals protruding from the housing along the orientation of the groove opening;

[0018] The battery device includes a busbar, and an insulating strip is recessed inward on the side opposite to the groove opening to form a recess. A channel is formed between the recess and the housing, and the busbar passes through the channel to connect the electrode terminals of two adjacent battery cells.

[0019] According to some embodiments of the battery device provided in this application, the insulating strip is bonded to the housing via an adhesive structure. By bonding the adhesive structure between the insulating strip and the housing, the insulating strip can be securely connected to the battery cell.

[0020] According to some embodiments of the present application, the battery device has a pressure relief structure in the housing. The pressure relief structure is arranged along the direction of the slot, which makes it difficult for the discharged material to enter the groove from the slot, reducing the possibility that the discharged material will electrically connect the belt and the battery cell, and thus improving the reliability of the battery device.

[0021] According to some embodiments of the present application, the battery device is bonded to an insulating strip, so that the strip and the insulating strip can be firmly bonded.

[0022] According to some embodiments of the present application, the battery device includes two reinforcing beams arranged opposite each other along a first direction, a plurality of battery cells are sandwiched between the two reinforcing beams, a belt is connected to the two reinforcing beams at both ends along the first direction, and a pressure strip assembly binds the battery cells and the reinforcing beams along the first direction, and is able to withstand the load caused by the expansion of the battery cells in the first direction.

[0023] According to some embodiments of the present application, the battery device includes a pressure strip assembly that also includes a connector that passes through the strip and is connected to the reinforcing beam. The insulating layer has a protective structure at its end in the first direction, and the protective structure covers the connector, which helps to improve the reliability of the connection between the connector and the reinforcing beam.

[0024] According to some embodiments of the present application, a battery device comprises at least two battery cell groups arranged along a second direction, each battery cell group including multiple battery cells arranged along a first direction. An insulating strip presses against the battery cells of two adjacent battery cell groups, and the second direction is perpendicular to the first direction. With this solution, an insulating strip can simultaneously press against the battery cells of two adjacent battery cell groups at adjacent locations, allowing the battery device to bind the battery cells in multiple battery cell groups using fewer strip assemblies.

[0025] According to some embodiments of the present application, the battery cell is bonded to the inner wall of the cavity, which enables the battery cell to be well positioned in the cavity, reduces the possibility of the battery cell shaking in the cavity, reduces the possibility of damage to the battery cell, and helps to improve the reliability of the battery device.

[0026] Secondly, some embodiments of this application provide an electrical device that includes the battery device provided by the above-described technical solution, the battery device being used to provide electrical energy.

[0027] The technical solutions provided by the embodiments of this disclosure have at least the following beneficial effects:

[0028] This application provides a battery device including a housing, a battery module, and a retaining strip assembly. The battery module, comprising multiple battery cells, is located within a cavity of the housing, with at least some of the battery cells arranged along a first direction and positioned outside the multiple battery cells arranged along the first direction. A strip in the retaining strip assembly is connected to an insulating retaining strip, which is located between the strip and the battery cells. An insulating layer covers the strip and is connected to both the strip and the insulating retaining strip. In this structure, because the insulating layer covers the strip and is connected to both the strip and the insulating retaining strip, the strip is less likely to be directly exposed in the cavity. This not only increases the creepage distance between the strip and the battery cells but also prevents leaked coolant, electrolyte, etc., from flowing onto the strip, reducing the possibility of a short circuit between the strip and the battery cells and improving the reliability of the battery device.

[0029] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0030] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0031] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application;

[0032] Figure 2 This is a exploded view of a battery device provided in some embodiments of this application;

[0033] Figure 3 A schematic diagram of the internal structure of a battery device provided in some embodiments of this application from one perspective;

[0034] Figure 4 A schematic diagram of the internal structure of a battery device provided in some embodiments of this application from another perspective;

[0035] Figure 5 for Figure 4 Sectional view at point AA;

[0036] Figure 6 For some embodiments Figure 5 Enlarged view of point B in the middle;

[0037] Figure 7 For some other embodiments Figure 5 Enlarged view of point B in the middle;

[0038] Figure 8 In some embodiments Figure 5 Enlarged view of point B in the middle;

[0039] Figure 9 This is a partial structural diagram of the insulating layer in a battery device provided in some embodiments of this application;

[0040] Figure 10 For some embodiments Figure 5 Enlarged view of point C in the middle;

[0041] Figure 11 This is an exploded view of the pressure bar assembly in a battery device provided in some embodiments of this application;

[0042] Figure 12 This is a schematic diagram of the structure of a single battery cell in a battery device provided in some embodiments of this application;

[0043] Figure 13 This is a partial structural diagram of the insulating layer in a battery device provided in other embodiments of this application;

[0044] Figure 14 This is a partial structural diagram of the pressure bar assembly in a battery device provided in some embodiments of this application.

[0045] In the attached diagram:

[0046] 10. Box body; 103. Cavity; 104. Box shell; 105. Bottom protective plate; 106. Reinforcing beam;

[0047] 20. Battery cell; 21. Casing; 22. Electrode terminals; 23. Pressure relief structure;

[0048] 30. Pressure strip assembly; 31. Belt body; 311. First surface; 312. Second surface; 313. Third surface; 32. Insulating pressure strip; 321. Groove; 322. Recess; 33. Insulating layer; 331. Covering part; 332. Connecting part; 3321. First part; 3322. Second part; 333. Protective structure; 34. Buffer; 35. Connector;

[0049] 40. Busbar;

[0050] 50. Channel;

[0051] 60. Battery cell assembly; 70. Bonding structure;

[0052] 1000, vehicle; 100, battery device; 200, controller; 300, motor; X, first direction; Y, second direction. Detailed Implementation

[0053] 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.

[0054] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0055] 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", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., 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 do not 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.

[0056] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0057] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the 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.

[0058] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0059] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As the application areas of batteries continue to expand, the demands on batteries are also constantly increasing.

[0060] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0061] Among them, the battery cell can be a secondary battery cell, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0062] Battery cells can be lithium-ion cells, sodium-ion cells, sodium-lithium-ion cells, lithium metal cells, sodium metal cells, lithium-sulfur cells, magnesium-ion cells, nickel-metal hydride cells, nickel-cadmium cells, lead-acid cells, etc.

[0063] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0064] In some embodiments, the battery device may be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.

[0065] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0066] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0067] In some embodiments, the battery device may be without a housing and may be directly a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0068] Multiple battery cells in a battery pack are typically secured using clamping strips. Currently, to enhance the binding force provided by the clamping strips, steel strips are often incorporated. However, when coolant or electrolyte leaks from the battery pack, there is a risk that the steel strip can conduct electricity through the coolant or electrolyte to the battery cells, causing insulation failure between the battery cells and the clamping strips. This negatively impacts the reliability of the battery pack.

[0069] To improve the reliability of battery devices, some embodiments of this application provide a battery device including a housing, a battery module, and a retaining strip assembly. The battery module, comprising multiple battery cells, is located within the cavity of the housing. The retaining strip assembly is disposed on the outside of the multiple battery cells and is used to bind the multiple battery cells. A strip in the retaining strip assembly is connected to an insulating retaining strip, which is located between the strip and the battery cells. An insulating layer covers the strip and is connected to both the strip and the insulating retaining strip. In this structure, because the insulating layer covers the strip and is connected to both the strip and the insulating retaining strip, the strip is less likely to be directly exposed in the cavity. This not only increases the creepage distance between the strip and the battery cells but also makes it less likely for leaked coolant, electrolyte, etc., from the housing to flow onto the strip, reducing the possibility of a short circuit between the strip and the battery cells, thus improving the reliability of the battery device.

[0070] The battery device described in the embodiments of this application is applicable to electrical devices that use battery devices.

[0071] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. Because this electrical device includes the battery device provided by the above-mentioned technical solution, it has good reliability.

[0072] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0073] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 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. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 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 the vehicle 1000 during starting, navigation, and driving.

[0074] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0075] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and battery cells 20, with the battery cells 20 housed within the housing 10. The housing 10 provides a cavity 103 for the battery cells 20. The battery device 100 may have multiple battery cells 20, which can be connected in series, parallel, or a combination thereof to form a battery module. A combination thereof refers to multiple battery cells 20 being connected in both series and parallel configurations.

[0076] The housing 10 may include a housing shell 104 and a bottom protective plate 105, which overlap each other to define a placement space for accommodating the battery cell 20. The housing shell 104 and the bottom protective plate 105 may be of various shapes, such as cuboids, cylinders, etc. The housing shell 104 may be a hollow structure with one side open, and the bottom protective plate 105 covers the open side of the first housing 101, thus forming a housing 10 with a cavity 103.

[0077] Continue to refer to Figures 3 to 5 Some embodiments of this application provide a battery device 100, which includes a housing 10, a pressure strip assembly 30, and a plurality of battery cells 20. The housing 10 forms a cavity 103; the plurality of battery cells 20 are located in the cavity 103, and at least some of the battery cells 20 are arranged along a first direction X; the pressure strip assembly 30 extends along the first direction X and is disposed on the outside of the plurality of battery cells 20 arranged along the first direction X, with reference to... Figures 6 to 8 The pressure strip assembly 30 includes a belt body 31, an insulating pressure strip 32, and an insulating layer 33. The belt body 31 is connected to the insulating pressure strip 32, the insulating pressure strip 32 is located between the belt body 31 and the battery cell 20, and the insulating layer 33 covers the belt body 31 and is connected to the belt body 31 and the insulating pressure strip 32.

[0078] The housing 10 can be the outer shell structure of the battery device 100, forming a cavity 103 to house other components within the battery device 100, thereby protecting those components. A single battery cell 20 can be the smallest unit in the battery device 100 used for charging and discharging. Multiple battery cells 20, disposed within the cavity 103, can be protected by the housing 10. The multiple battery cells 20 located within the cavity 103 can be electrically connected to increase the output voltage and capacity of the battery device 100.

[0079] At least some of the multiple battery cells 20 located in the cavity 103 are arranged along a first direction to form a battery cell group 60 so as to be bound by the pressure strip assembly 30.

[0080] The pressure strip assembly 30 can be used to fix multiple battery cells 20 in the cavity 103. It is disposed on the outside of the multiple battery cells 20 and can press the battery cells 20 against the inner wall of the cavity 103 to reduce vibration and shaking. The pressure strip assembly 30 extends along a first direction X, enabling it to press multiple battery cells 20 arranged along the first direction X. Furthermore, the pressure strip assembly 30 extending along the first direction X can also withstand the expansion force of the battery cells 20 in the first direction X, thus forming a unified structure with the multiple battery cells 20. The pressure strip assembly 30 can be arranged along the arrangement direction of the multiple battery cells 20 and connected to both ends of the multiple battery cells 20 to fix the multiple battery cells 20 along the arrangement direction.

[0081] The belt body 31 can be the main structure in the pressure strip assembly 30, serving as the primary load-bearing component. Exemplarily, the belt body 31 may include a metallic material, such as stainless steel or aluminum; in some embodiments, the belt body 31 may also be a composite material combining a metallic layer and a non-metallic layer, such as a stainless steel layer combined with a nylon layer. Those skilled in the art can select the material of the belt body 31 based on the actual situation, such as the required preload force of the pressure strip assembly 30.

[0082] The insulating strip 32 can be a component disposed on the outside of the belt body 31, used to provide insulation between the belt body 31 and the battery cell 20. The insulating strip 32 is located between the belt body 31 and the battery cell 20. Alternatively, the entire insulating strip 32 can be located between the belt body 31 and the battery cell 20; or a portion of the insulating strip 32 can be located along the thickness direction of the belt body 31 between the belt body 31 and the battery cell 20, while another portion can be located on the side of the belt body 31 perpendicular to its own thickness direction. By positioning the insulating strip 32 between the belt body 31 and the battery cell 20, insulation is achieved between the belt body 31 and the battery cell 20.

[0083] For example, the insulating strip 32 may include a thermoplastic composite material or mica paper. The thermoplastic composite material is a composite material composed of thermoplastic resin and reinforcing materials (such as glass fiber, carbon fiber, etc.). Mica paper may refer to paper made from mica through processing. By including the thermoplastic composite material or mica paper in the insulating strip 32, not only does the insulating strip 32 have good insulation properties, but it also has a high melting point.

[0084] The tape 31 is connected to the insulating strip 32. This connection can be achieved by bonding the tape 31 to the insulating strip 32 with adhesive, or by connecting bolts, pins, or other manifold components 40. By connecting the tape 31 to the insulating strip 32, the two become a single integrated structure. This not only reduces the possibility of misalignment between the tape 31 and the insulating strip 32, but also allows the expansion force from the battery cells 20 on the insulating strip 32 to be better transferred to the tape 31, facilitating the tape 31's ability to withstand loads.

[0085] The insulating layer 33 can be a structural layer with insulating properties. The insulating layer 33 covers the tape 31, which can be: the insulating layer 33 covering the entire outer surface of the tape 31; the insulating layer 33 covering a larger area of ​​the outer surface of the tape 31; or the insulating layer 33 covering the outer surface of the tape 31 facing away from the insulating strip 32. Those skilled in the art can cover the outer surface of the insulating strip 32 according to actual conditions to reduce the possibility of contact between the outer surface of the insulating strip 32 and the coolant or electrolyte in the cavity 103.

[0086] By covering the tape body 31 with the insulating layer 33, the area of ​​the tape body 31 directly exposed to the cavity 103 is reduced, or the surface of the tape body 31 is not easily directly exposed to the cavity 103, thereby reducing the possibility of the outer surface of the insulating strip 32 coming into contact with the coolant or electrolyte in the cavity 103.

[0087] For example, the insulating layer 33 may include one of polycarbonate, polypropylene, and polyvinyl chloride. The insulating layer 33 is made of polycarbonate, polypropylene, or polyvinyl chloride, which not only provides good insulation properties but also improves the electrolyte corrosion resistance of the insulating layer 33.

[0088] For example, the insulating layer 33 can be a film structure, and the insulating layer 33 in the form of a film structure can be connected to the tape 31 and the insulating strip 32 by adhesive bonding; the insulating layer 33 can also be a coating structure, and the insulating layer 33 in the form of a coating structure can be directly coated onto the tape 31 and the insulating strip 32 by spraying.

[0089] In the above structure, since the insulating layer 33 covers the belt 31 and is connected to the belt 31 and the insulating strip 32, the belt 31 is not easily exposed directly in the cavity 103. This not only increases the creepage distance between the belt 31 and the battery cell 20, but also makes it difficult for leaked coolant, electrolyte, etc. in the housing 10 to flow onto the belt 31, reducing the possibility of short circuit between the belt 31 and the battery cell 20, which is beneficial to improving the reliability of the battery device 100.

[0090] In some embodiments, reference Figure 7 and Figure 8The insulating strip 32 is provided with a groove 321, and at least part of the strip 31 is located in the groove 321.

[0091] The groove 321 may be a groove-shaped structure provided on the insulating strip 32, which is used to accommodate at least a portion of the strip 31. At least a portion of the strip 31 is located in the groove 321, which may be that part of the strip 31 is located in the groove 321 and another portion of the strip 31 extends out from the opening of the groove 321; or the entire strip 31 may be located in the groove 321.

[0092] By positioning at least a portion of the tape 31 within the groove 321, the tape 31 can be positioned on the insulating strip 32 by the groove 321. This improves the reliability of the connection between the tape 31 and the insulating strip 32, reduces the possibility of misalignment between the tape 31 and the insulating strip 32, and enhances the stability of the strip assembly 30 in use.

[0093] In some embodiments, the insulating layer 33 includes a cover portion 331 and a connecting portion 332 that are connected to each other. The tape body 31 is provided with a first surface 311, which is located on the side of the tape body 31 facing the groove 321. The cover portion 331 covers the first surface 311, and the connecting portion 332 is connected to the insulating strip 32.

[0094] The covering portion 331 and the connecting portion 332 can be two interconnected parts of the insulating layer 33. The covering portion 331 is the part used to cover the surface of the tape 31, and the connecting portion 332 is the part used to connect with the insulating strip 32. The first surface 311, as an outer surface of the tape 31, is located on the side of the tape 31 facing the groove 321. The first surface 311 is more likely to come into contact with the coolant or electrolyte in the cavity 103. By covering the first surface 311 with the covering portion 331, the first surface 311 is effectively separated from the coolant or electrolyte in the cavity 103, reducing the possibility of contact between the first surface 311 and the coolant or electrolyte in the cavity 103.

[0095] The connecting portion 332 is connected to the insulating pressure strip 32. Alternatively, the connecting portion 332 can be sealed to the inner wall of the groove 321, preventing coolant or electrolyte from entering the space where the tape 31 is placed from the connection between the connecting portion 332 and the inner wall of the groove 321. Or, the connecting portion 332 can be sealed to the outside of the groove opening of the groove 321, covering the opening, thus preventing coolant or electrolyte from entering the space where the tape 31 is placed from the connection between the connecting portion 332 and the inner wall of the groove 321. Furthermore, by connecting the connecting portion 332 to the insulating pressure strip 32, the insulating layer 33 can be well attached to the insulating pressure strip 32, reducing the possibility of the insulating layer 33 detaching from the insulating pressure strip 32.

[0096] In some embodiments, at least a portion of the connecting portion 332 is connected to the inner wall of the groove 321.

[0097] At least a portion of the connecting part 332 is connected to the inner wall of the groove 321. This can be achieved by partially sealing the connecting part 332 to the inner wall of the groove 321 and sealing the other portion of the connecting part 332 to the outside of the groove opening of the groove 321, thus sealing the groove opening and improving the sealing performance of the connection between the connecting part 332 and the insulating strip 32. Alternatively, the entire connecting part 332 can be sealed to the inner wall of the groove 321, so that the connecting part 332 can seal the space where the belt body 31 is located.

[0098] In some embodiments, the belt body 31 has two opposing second surfaces 312, the first surface 311 intersects and connects between the two second surfaces 312, and at least a portion of the connecting portion 332 is connected to and sandwiched between the inner wall of the groove 321 and the second surface 312.

[0099] The second surface 312 serves as the outer surface of the belt body 31 and is connected to the first surface 311. The belt body 31 has two relatively spaced second surfaces 312, and the first surface 311 is connected between the two second surfaces 312.

[0100] At least a portion of the connecting portion 332 is sandwiched between the inner wall of the groove 321 and the second surface 312. This can be because a portion of the connecting portion 332 is sandwiched between the inner wall of the groove 321 and the second surface 312, while another portion extends into the belt body 31 between the third surface 313 and the bottom wall of the groove 321. The third surface 313 is disposed opposite to the first surface 311 and connected between the two second surfaces 312. Alternatively, the entire connecting portion 332 can be sandwiched between the inner wall of the groove 321 and the second surface 312.

[0101] By having at least a portion of the connecting part 332 sandwiched between the inner wall of the groove 321 and the second surface 312, the connecting part 332 can better seal the gap between the belt body 31 and the inner wall of the groove 321, which helps to reduce the possibility of coolant or electrolyte entering the space where the belt body 31 is placed.

[0102] In some embodiments, at least a portion of the connecting portion 332 is connected to the area of ​​the insulating strip 32 located outside the slot.

[0103] At least a portion of the connecting part 332 is connected to the area outside the groove of the insulating strip 32. This could mean that part of the connecting part 332 is located in the groove 321 and connected to the inner wall of the groove 321, while another portion of the connecting part 332 extends out of the groove 321 and connects to the area outside the groove opening of the groove 321, covering the groove opening; alternatively, refer to... Figure 6The entire connecting part 332 is located in the area outside the groove 321. The connecting part 332 connects from the outside of the groove 321 to the outside of the groove opening of the groove 321, covering the groove opening.

[0104] By connecting at least a portion of the connecting portion 332 to the area outside the slot of the insulating strip 32, the insulating layer 33 is able to separate the space where the strip 31 is located from the cavity 103.

[0105] In some embodiments, continue to refer to Figure 8 and Figure 9 Along the orientation of the groove, the thickness of the strip 31 is less than the depth of the groove 321. The connecting part 332 includes a first part 3321 and a second part 3322. The second part 3322 is connected between the first part 3321 and the covering part 331. The second part 3322 is connected to the inner wall of the groove 321. The first part 3321 extends out of the groove 321 and is connected to the area of ​​the insulating strip 32 located outside the groove.

[0106] By setting the thickness of the strip 31 along the groove opening direction to be less than the depth of the groove 321 along the groove opening direction, the strip 31 can be located entirely in the groove 321, so that the strip 31 can be better protected by the insulating strip 32.

[0107] The first part 3321 and the second part 3322 can be two interconnected parts of the connecting part 332, wherein the second part 3322 is connected between the first part 3321 and the covering part 331. The second part 3322 is connected to the inner wall of the groove 321, which can be done by adhesive bonding. The first part 3321 extends out of the groove 321 and is connected to the area of ​​the insulating strip 32 outside the slot, which can be done by the first part 3321 extending out of the groove 321 and being connected to the outer part of the slot in the insulating strip 32, so that the first part 3321 covers the slot, and the space in the groove 321 where the strip 31 is located can be well separated from the cavity 103 by the insulating layer 33.

[0108] In some embodiments, the groove 321 is positioned opposite to the battery cell 20.

[0109] The groove 321 is positioned with its opening facing away from the battery cell 20. This means that the opening of the groove 321 is facing away from the battery cell 20, which helps to increase the creepage distance between the strip 31 located in the groove 321 and the battery cell 20, and helps to improve the reliability of the battery device 100.

[0110] In some embodiments, the pressure strip assembly 30 further includes a buffer 34 connected to the side of the insulating layer 33 facing away from the battery cell 20.

[0111] The buffer 34 can be a component in the pressure strip assembly 30 used to buffer the impact and bumps from the housing 10. By providing the buffer 34 on the side of the insulation layer 33 facing away from the battery cell 20, the buffer 34 is positioned between the insulation layer 33 and the housing 10, allowing the buffer 34 to absorb the force transmitted from the housing 10 and reduce the impact and bumps on the pressure strip assembly 30.

[0112] For example, the buffer 34 can be made of elastic materials such as sponge or rubber, so that the buffer 34 sandwiched between the insulation layer 33 and the housing 10 can use its own elastic restoring force to press the pressure strip assembly 30 against the battery cell 20.

[0113] In some embodiments, along the groove opening orientation of the groove 321, the thickness of the belt 31 is less than the depth of the groove 321, and the buffer 34 is disposed in the groove 321 and a portion of the buffer 34 extends out of the groove 321 along the groove opening orientation.

[0114] By making the thickness of the strip 31 along the opening of the groove 321 less than the depth of the groove 321 along the opening, the groove 321 has space to accommodate the strip 31. The buffer 34 is disposed in the groove 321, which can be inserted into the groove 321, so that the buffer 34 can be positioned with the insulating strip 32 through the groove 321, which helps to reduce the possibility of misalignment between the buffer 34 and the insulating strip 32.

[0115] By extending part of the buffer 34 from the groove 321 along the direction of the slot, part of the buffer 34 can abut against the housing 10, so that the pressure strip assembly 30 can abut against the housing 10.

[0116] In some embodiments, the bottom guard plate 105 is located on the side of the buffer 34 away from the insulating layer 33.

[0117] The housing 104 can be the main structure in the housing 10, which can form a cavity 103 with an opening. The bottom protective plate 105 can be a structure in the housing 10 for covering the opening, which covers the opening so that the housing 104 forms a cavity 103 isolated from the outside, reducing the impact of the external environment on the battery cells 20 and other devices in the cavity 103.

[0118] By placing the bottom guard plate 105 on the side of the buffer member 34 away from the insulation layer 33, not only can the bottom guard plate 105 abut against the buffer member 34 to press the pressure strip assembly 30 onto the battery cell 20, but also the impact on the bottom guard plate 105 can be buffered by the buffer member 34 before being transmitted to the battery cell 20.

[0119] In some embodiments, reference Figure 10The battery cell 20 includes a housing 21 and electrode terminals 22 disposed on the housing 21. The electrode terminals 22 protrude from the housing 21 along the orientation of the groove 321. The battery assembly 100 includes a busbar 40. (Refer to...) Figure 11 The insulating strip 32 is recessed inward on the side opposite to the groove opening of the groove 321 to form a recess 322. A channel 50 is formed between the recess 322 and the housing 21. The busbar 40 passes through the channel 50 to connect the electrode terminals 22 of two adjacent battery cells 20.

[0120] The housing 21 is the outer shell structure of the battery cell 20. The electrode terminal 22, as a component in the battery cell 20 for electrical connection with external devices, protrudes from the housing 21. The electrode terminal 22 protrudes from the housing 21 along the orientation of the groove 321, so that the battery cell 20 is arranged in an inverted manner.

[0121] The busbar 40 can be a component in the battery device 100 used to electrically connect two adjacent battery cells 20. The recess 322 is a structure inwardly recessed on the side of the insulating strip 32 away from the groove 321, which is used to form a channel 50 through the busbar 40 between the insulating strip 32 and the housing 21, so that the busbar 40 can pass through the strip assembly 30 to connect the electrode terminals 22 of the two battery cells 20 on both sides of the strip assembly 30.

[0122] In some embodiments, the insulating strip 32 is bonded to the housing 21 by an adhesive structure 70.

[0123] The adhesive structure 70 can be a structure formed by the curing of adhesive. By bonding the adhesive structure 70 between the insulating strip 32 and the housing 21, the insulating strip 32 can be firmly connected to the battery cell 20.

[0124] In some embodiments, reference Figure 12 The housing 21 is provided with a pressure relief structure 23, and the orientation of the pressure relief structure 23 is arranged along the orientation of the slot.

[0125] The pressure relief structure 23 can be a mechanism that connects the sealed space inside the battery cell 20 to the outside. It is used to discharge the released material (including electrolyte) when the pressure in the sealed space of the battery cell 20 rises above a preset value due to thermal runaway, so as to reduce the pressure in the sealed space.

[0126] By arranging the pressure relief structure 23 along the direction of the slot, the pressure relief structure 23 and the electrode terminal 22 can be located on the same side of the battery cell 20, making it difficult for the discharged material to enter the groove 321 from the slot, reducing the possibility of the discharged material electrically connecting the strip 31 and the battery cell 20, which is beneficial to improving the reliability of the battery device 100.

[0127] In some embodiments, the tape 31 is adhered to the insulating strip 32.

[0128] The tape 31 can be bonded to the insulating strip 32 by means of adhesive, so that the tape 31 and the insulating strip 32 can be firmly bonded. For example, the adhesive used to bond the tape 31 and the insulating strip 32 can be a structural adhesive, which can have high bonding strength after curing, so that the strip assembly 30 can better withstand the expansion force of the battery cell 20.

[0129] In some embodiments, the housing 10 includes two reinforcing beams 106 arranged opposite each other along a first direction X, a plurality of battery cells 20 are sandwiched between the two reinforcing beams 106, a belt 31 is connected to the two reinforcing beams 106 at both ends along the first direction X, and a pressure strip assembly 30 binds the battery cells 20 and the reinforcing beams 106 along the first direction X.

[0130] The reinforcing beam 106 can be a beam-shaped component disposed in the cavity 103 of the housing 10. By providing two reinforcing beams 106 disposed at relative intervals along the first direction X in the cavity 103 of the housing 10, the reinforcing beams 106 can not only increase the structural strength of the housing 10, but also clamp multiple battery cells 20 from both sides of the first direction X.

[0131] The two ends of the belt 31 along the first direction X are respectively connected to two reinforcing beams 106. Alternatively, the two ends of the belt 31 along the first direction X are respectively connected to two reinforcing beams 106, so that the pressure strip assembly 30 extends along the first direction X, so that the pressure strip assembly 30 binds the battery cell 20 and the reinforcing beams 106 along the first direction X, and can withstand the load caused by the expansion of the battery cell 20 in the first direction X.

[0132] In some embodiments, reference Figure 13 and Figure 14 The pressure strip assembly 30 also includes a connector 35, which passes through the strip body 31 and is connected to the reinforcing beam 106. The insulating layer 33 has a protective structure 333 at its end in the first direction X, and the protective structure 333 covers the connector 35.

[0133] The connector 35 can be a device for connecting the belt 31 to the reinforcing beam 106. Exemplarily, the connector 35 can be a connecting bolt or a connecting pin; those skilled in the art can select the type of connector 35 according to the actual situation. The connector 35, by passing through the belt 31 and connecting to the reinforcing beam 106, can securely connect the belt 31 to the reinforcing beam 106.

[0134] The protective structure 333 can be a structure provided at the end of the insulating layer 33 in the first direction X. It is used to cover the connector 35 to reduce the possibility of the connector 35 coming into contact with the electrolyte, coolant, etc. in the cavity 103, which is beneficial to improving the reliability of the connection between the connector 35 and the reinforcing beam 106.

[0135] In some embodiments, a plurality of battery cells 20 form at least two battery cell groups 60 arranged along a second direction Y. Each battery cell group 60 includes a plurality of battery cells 20 arranged along a first direction X. An insulating strip 32 presses against the battery cells 20 of two adjacent battery cell groups 60. The second direction Y is perpendicular to the first direction X.

[0136] The first direction X can be the arrangement direction of multiple battery cells 20 in the battery cell group 60, and the second direction Y is a direction perpendicular to the first direction X. The battery cell group 60 can include multiple battery cells 20 arranged along the first direction X. The multiple battery cells 20 in the cavity 103 of the battery device 100 are divided into at least two battery cell groups 60, and the at least two battery cell groups 60 are arranged along the second direction Y. An insulating pressure strip 32 can simultaneously press the battery cells 20 of adjacent battery cell groups 60 at adjacent locations, so that the battery device 100 can fix the battery cells 20 in multiple battery cell groups 60 with fewer pressure strip assemblies 30.

[0137] In some embodiments, the battery cell 20 is bonded to the inner wall of the cavity 103.

[0138] The battery cell 20 is bonded to the inner wall of the cavity 103 with adhesive, which allows the battery cell 20 to be well positioned in the cavity 103. This reduces the possibility of the battery cell 20 shaking in the cavity 103, which helps to reduce the possibility of damage to the battery cell 20 and improves the reliability of the battery device 100.

[0139] Some embodiments of this application also provide an electrical device, which includes a battery device 100 provided by any of the above technical solutions, the battery device 100 being used to provide electrical energy.

[0140] Some embodiments of this application provide a battery device 100, which includes a plurality of battery cells 20, a housing 10, and a retaining strip assembly 30. The plurality of battery cells 20 are located in the cavity 103 of the housing 10, and at least some of the battery cells 20 are arranged along a first direction X. The retaining strip assembly 30 is disposed on the outside of the plurality of battery cells 20 arranged along the first direction X for fixing the plurality of battery cells 20. The strip body 31 of the retaining strip assembly 30 is located in the groove 321 of the insulating retaining strip 32, the groove opening of the groove 321 is facing away from the battery cells 20, the insulating retaining strip 32 is located between the strip body 31 and the battery cells 20, the covering portion 331 of the insulating layer 33 covers the first surface 311 of the strip body 31, the second portion 3322 of the connecting portion 332 is connected to the inner wall of the groove 321, and the first portion 3321 extends out of the groove 321 and covers the groove opening. The buffer 34 of the pressure strip assembly 30 is disposed in the groove 321, and a portion of the buffer 34 extends out of the groove 321 along the orientation of the groove opening and abuts against the housing 10. Multiple battery cells 20 are divided into at least two battery cell groups 60, each battery cell group 60 including multiple battery cells 20 arranged along a first direction X. The insulating pressure strip 32 presses against the battery cells 20 of two adjacent battery cell groups 60.

[0141] In the above structure, since the insulating layer 33 covers the belt 31 and is connected to the belt 31 and the insulating strip 32, the belt 31 is not easily exposed directly in the cavity 103. This not only increases the creepage distance between the belt 31 and the battery cell 20, but also makes it difficult for leaked coolant, electrolyte, etc. in the housing 10 to flow onto the belt 31, reducing the possibility of short circuit between the belt 31 and the battery cell 20, which is beneficial to improving the reliability of the battery device 100.

[0142] 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 device, characterized in that, include: The box-shaped structure forms a cavity; Multiple battery cells are located in the cavity, and at least some of the battery cells are arranged along a first direction; A pressure strip assembly extends along the first direction and is disposed on the outside of a plurality of battery cells arranged along the first direction. The pressure strip assembly includes a strip body, an insulating pressure strip, and an insulating layer. The strip body is connected to the insulating pressure strip, the insulating pressure strip is located between the strip body and the battery cells, and the insulating layer covers the strip body and is connected to the strip body and the insulating pressure strip.

2. The battery device according to claim 1, characterized in that, The insulating strip has a groove, and at least a portion of the strip body is located in the groove.

3. The battery device according to claim 2, characterized in that, The insulating layer includes a cover portion and a connecting portion that are connected to each other. The tape body has a first surface located on the side of the tape body facing the groove opening. The cover portion covers the first surface, and the connecting portion is connected to the insulating strip.

4. The battery device according to claim 3, characterized in that, At least a portion of the connecting part is connected to the inner wall of the groove.

5. The battery device according to claim 4, characterized in that, The belt body has two opposing second surfaces, the first surface is connected between the two second surfaces, and at least part of the connecting portion is sandwiched between the inner wall of the groove and the second surface.

6. The battery device according to claim 3, characterized in that, At least a portion of the connecting portion is connected to the area of ​​the insulating strip located outside the slot.

7. The battery device according to claim 3 or 6, characterized in that, Along the orientation of the slot, the thickness of the strip is less than the depth of the groove. The connecting part includes a first part and a second part. The second part is connected between the first part and the covering part. The second part is connected to the inner wall of the groove. The first part extends out of the groove and is connected to the area where the insulating strip is located outside the slot.

8. The battery device according to claim 2, characterized in that, The groove opening is positioned opposite to the battery cell.

9. The battery device according to claim 2, characterized in that, The pressure strip assembly also includes a buffer element connected to the side of the insulating layer facing away from the battery cell.

10. The battery device according to claim 9, characterized in that, Along the groove opening orientation, the thickness of the belt body is less than the depth of the groove, the buffer is disposed in the groove, and a portion of the buffer extends out of the groove along the groove opening orientation.

11. The battery device according to claim 9 or 10, characterized in that, The enclosure includes a shell and a bottom plate. The shell forms the cavity with an opening, and the bottom plate covers the opening. The bottom plate is located on the side of the buffer away from the insulating layer.

12. The battery device according to claim 2, characterized in that, The battery cell includes a housing and electrode terminals disposed on the housing, the electrode terminals protruding from the housing along the orientation of the groove opening; The battery device includes a busbar, and the insulating strip is recessed inward on the side opposite to the groove opening to form a recess. A channel is formed between the recess and the housing, and the busbar passes through the channel to connect the electrode terminals of two adjacent battery cells.

13. The battery device according to claim 12, characterized in that, The insulating strip is bonded to the housing via an adhesive structure.

14. The battery device according to claim 12 or 13, characterized in that, The housing is provided with a pressure relief structure, and the orientation of the pressure relief structure is arranged along the orientation of the slot.

15. The battery device according to claim 1, characterized in that, The tape is bonded to the insulating strip.

16. The battery device according to claim 1, characterized in that, The housing includes two reinforcing beams arranged opposite each other along a first direction, a plurality of battery cells are sandwiched between the two reinforcing beams, the belt is connected to the two reinforcing beams at both ends along the first direction, and the pressure strip assembly binds the battery cells and the reinforcing beams along the first direction.

17. The battery device according to claim 16, characterized in that, The pressure strip assembly also includes a connector that passes through the strip and is connected to the reinforcing beam. The insulating layer has a protective structure at its end in the first direction, and the protective structure covers the connector.

18. The battery device according to claim 1, characterized in that, The plurality of battery cells form at least two battery cell groups arranged along a second direction, the battery cell group including a plurality of battery cells arranged along a first direction, the insulating strip pressing against the battery cells of two adjacent battery cell groups, the second direction being perpendicular to the first direction.

19. The battery device according to claim 1, characterized in that, The individual battery cells are bonded to the inner wall of the cavity.

20. An electrical appliance, characterized in that, Includes a battery device as described in any one of claims 1-19, the battery device being used to provide electrical energy.

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