Battery device and electric device

Abstract

The invention provides a battery device and a power utilization device. A binding band in a battery module of the battery device is arranged on the outer sides of a plurality of battery monomers and binds the plurality of battery monomers; an insulator in the binding band is arranged on a band body in a sleeving mode and wraps at least part of the band body, the insulator comprises a first insulating layer and a second insulating layer, the first insulating layer is arranged between the second insulating layer and the band body, and the melting point of the second insulating layer is higher than that of the first insulating layer. The first insulating layer in the insulator is arranged between the second insulating layer and the band body, and the melting point of the second insulating layer is higher than that of the first insulating layer, so that the insulator of the binding band has good high-temperature resistance, the insulation of the insulator is not easy to lose efficacy, and the possibility of short circuit between the band body and the single battery is reduced; and the overall 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] Batteries have advantages such as high energy density and high power density, and are widely used in electronic devices and transportation, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships and power tools.

[0003] As the application fields of batteries continue to expand, how to improve battery reliability is receiving increasing attention from those skilled in the art. Summary of the Invention

[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 and a battery module, wherein the battery module is located in the housing, the battery module includes a strap and a plurality of battery cells, the strap is disposed on the outside of the plurality of battery cells and is used to bind the plurality of battery cells; the strap includes a band and an insulator, the insulator is sleeved on the band and covers at least a portion of the band, the insulator includes a first insulating layer and a second insulating layer, the first insulating layer is disposed between the second insulating layer and the band, and the melting point of the second insulating layer is higher than the melting point of the first insulating layer.

[0006] In the above structure, since the first insulating layer in the insulator is disposed between the second insulating layer and the tape, and the melting point of the second insulating layer is higher than that of the first insulating layer, the insulator of the strap has good high temperature resistance, making the insulation of the insulator less prone to failure, reducing the possibility of short circuit between the tape and the battery cell, which is beneficial to improving the reliability of the battery module, and thus improving the overall reliability of the battery device.

[0007] According to some embodiments of the present application, the battery device has a melting point of T, where T ≥ 300°C, which gives the second insulating layer good high-temperature resistance and makes it less likely to melt under the high temperature and flue gas impact generated by the thermal runaway of the battery cell.

[0008] According to some embodiments of the present application, the battery device provides a first insulating layer configured as a heat-shrinkable sleeve fitted onto the outer peripheral surface of the belt. Since the heat-shrinkable sleeve has the characteristic of shrinking when heated, using the heat-shrinkable sleeve fitted onto the outer peripheral surface of the belt as the first insulating layer ensures that the first insulating layer is securely positioned on the outer peripheral surface of the belt.

[0009] According to some embodiments of the battery device provided in this application, the first insulating layer comprises one of polycarbonate, polypropylene, and polyvinyl chloride. This results in a lower corrosion rate for the first insulating layer, which is beneficial for improving the electrolyte corrosion resistance of the insulator.

[0010] According to some embodiments of the present application, the battery device provided with a second insulating layer comprises a thermoplastic composite material or mica paper, such that the second insulating layer has a high melting point and good insulation properties.

[0011] According to some embodiments of the present application, the battery device has a first insulating layer with a thickness of H1, where H1 ≥ 0.08 mm, which enables the first insulating layer to meet the requirements of resistance to electrolyte penetration and helps to reduce the possibility of electrolyte corrosion of the belt.

[0012] According to some embodiments of the present application, the thickness of the second insulating layer is H2, 0.03mm≤H2≤0.8mm, so that the second insulating layer can meet the requirements of high temperature resistance and flue gas impact resistance, and is not prone to material waste due to excessive thickness.

[0013] According to some embodiments of the present application, the battery device has a thickness of 0.05mm ≤ H2 ≤ 0.5mm, which ensures that the second insulating layer can meet the requirements of high temperature resistance and flue gas impact resistance, while avoiding material waste due to excessive thickness.

[0014] According to some embodiments of the present application, the battery device further includes two end plates disposed opposite each other along a first direction, a plurality of battery cells sandwiched between the two end plates, and a strap connecting to the end plates and binding the battery cells and the end plates along the first direction. The two end plates are connected by the strap, so that the two oppositely disposed end plates can apply a preload to the plurality of battery cells arranged along the first direction, which is beneficial to improving the overall integrity of the plurality of battery cells.

[0015] According to some embodiments of the present application, the battery device includes a strap comprising a first part and a second part connected to each other. The first part is close to the battery cell and has an insulator, while the second part is located on the surface of the end plate away from the battery cell and is not covered by an insulator. Along a first direction, both ends of the insulator extend beyond the side of the end plate facing the battery cell. By making both ends of the insulator extend beyond the side of the end plate facing the battery cell along the first direction, the insulator can fully cover the portion of the strap corresponding to the battery cell, increasing the creepage distance between the battery cell and the strap, which helps to reduce the possibility of a short circuit between the strap and the battery cell.

[0016] According to some embodiments of the battery device provided in this application, the strap further includes a transition portion connecting the first portion and the second portion, and the transition portion is provided with an insulator. By providing an insulator on the transition portion, the insulator extends beyond the first portion, providing a certain redundancy, which can better insulate the strap and the individual battery cells, thereby improving the reliability of the battery module and thus improving the overall reliability of the battery device.

[0017] According to some embodiments of this application, the battery device includes a strap that surrounds a plurality of battery cells and two end plates, and includes two first portions disposed opposite to each other along a second direction and two second portions disposed opposite to each other along the first direction, the second direction being perpendicular to the first direction, and the second portions being connected between the two first portions.

[0018] According to some embodiments of the present application, a battery device is provided in which a first part is connected to a second part at both ends in a first direction, and the second part is connected to an end plate. By connecting the second part to both ends of the first part along the first direction, the second parts connected to both ends of the first part can be respectively connected to two end plates disposed opposite to each other along the first direction.

[0019] According to some embodiments of this application, a battery device is provided, wherein the battery module includes a connector, and a second portion is connected to an end plate via the connector. The second portion is connected to the end plate via the connector, enabling the second portion to be securely connected to the end plate and applying sufficient preload to multiple battery cells.

[0020] According to some embodiments of the present application, a battery device has a recess on the side of the end plate opposite to the battery cell, the recess extending to the edge of the end plate, and at least a portion of the second part is accommodated in the recess and abuts against the bottom surface of the recess. By abutting the second part against the bottom surface of the recess, the height of the second part protruding from the end plate can be reduced, which helps to reduce the possibility of the battery module in the battery device colliding with external components.

[0021] According to some embodiments of this application, a battery device includes a battery cell comprising a casing, electrode terminals, and a pressure relief mechanism. The casing includes a wall portion, and the electrode terminals and the pressure relief mechanism are spaced apart from each other along a second direction. A strap is located between the electrode terminals and the pressure relief mechanism, with the first and second directions perpendicular to each other. By arranging the electrode terminals and the pressure relief mechanism spaced apart along the second direction and placing the strap between them, the strap is less likely to come into contact with the electrode terminals and the pressure relief mechanism, thus reducing the possibility of interference between the strap and the electrode terminals and the pressure relief mechanism.

[0022] According to some embodiments of the battery device provided in this application, the corrosion resistance of the first insulating layer to the electrolyte is higher than that of the second insulating layer. Because the second insulating layer has excellent high-temperature resistance and can withstand the high-temperature impact during thermal runaway of a single battery cell, the first insulating layer, protected by the second insulating layer, is less likely to be damaged by the thermal runaway of the battery cell. This allows the first insulating layer to maintain good resistance to electrolyte corrosion, making the insulation less prone to failure and reducing the possibility of short circuits between the battery pack and the battery cell. This improves the reliability of the battery module and, consequently, the overall reliability of the battery device.

[0023] 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.

[0024] The technical solutions provided by the embodiments of this disclosure have at least the following beneficial effects:

[0025] This application provides a battery device comprising a battery module and a housing, wherein the battery module is located within the housing. The battery module includes a strap and multiple battery cells. The strap is disposed on the outside of the multiple battery cells and is used to bind the multiple battery cells. The strap includes a band and an insulator. The insulator is sleeved on the band and covers at least a portion of the band. The insulator includes a first insulating layer and a second insulating layer. The first insulating layer is disposed between the second insulating layer and the band, and the melting point of the second insulating layer is higher than that of the first insulating layer. In the above structure, because the first insulating layer in the insulator is disposed between the second insulating layer and the band, and the melting point of the second insulating layer is higher than that of the first insulating layer, the insulator of the strap has good high-temperature resistance, making the insulation of the insulator less prone to failure, reducing the possibility of short circuit between the band and the battery cells, which is beneficial to improving the reliability of the battery module, and thus improving the overall reliability of the battery device.

[0026] 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, specific embodiments of this application are given below. Attached Figure Description

[0027] 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.

[0028] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application;

[0029] Figure 2 This is a exploded view of a battery device provided in some embodiments of this application;

[0030] Figure 3 This is a schematic diagram of the structure of a battery module provided in some embodiments of this application;

[0031] Figure 4 This is a schematic diagram of the strap structure in a battery module provided in some embodiments of this application;

[0032] Figure 5 for Figure 4 Sectional view at point AA;

[0033] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0034] Figure 7 This is a schematic diagram of the strap structure in a battery module provided in other embodiments of this application;

[0035] Figure 8 This is a schematic diagram of the structure of a battery module provided in some other embodiments of this application;

[0036] Figure 9 This is a schematic diagram of the structure of a battery module provided in some embodiments of this application;

[0037] Figure 10 This is a schematic diagram of the structure of a battery module provided in some embodiments of this application.

[0038] In the attached diagram:

[0039] 10. Box body; 101. First box body; 102. Second box body; 103. Storage space;

[0040] 20. Battery cell; 201. Housing; 202. Electrode terminals; 203. Pressure relief mechanism;

[0041] 30. Strap; 301. Strap body; 302. Insulator; 3021. First insulating layer; 3022. Second insulating layer; 303. First part; 304. Second part; 305. Transition part;

[0042] 40. End plate; 401. Recess;

[0043] 50. Connectors;

[0044] 1000, Vehicle; 100, Battery unit; 1001, Battery module; 200, Controller; 300, Motor; X, Second direction; Y, First direction. Detailed Implementation

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0059] 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.

[0060] Multiple battery cells in a battery module are typically bound together as a single unit using straps. However, the insulation protection on the straps in existing technologies does not take into account the high temperatures, flue gas impact, and electrolyte corrosion that occur during thermal runaway of the battery cells. These factors can damage the insulation protection on the straps, increasing the risk of insulation failure between the battery cells and the straps, which is detrimental to improving the reliability of the battery module.

[0061] To improve the reliability of the battery module, the battery module includes a strap and multiple battery cells. The strap is disposed on the outside of the multiple battery cells and is used to bind the multiple battery cells. The strap includes a strip body and an insulator. The insulator is sleeved on the strip body and covers at least a portion of the strip body. The insulator includes a first insulating layer and a second insulating layer. The first insulating layer is disposed between the second insulating layer and the strip body. The melting point of the second insulating layer is higher than that of the first insulating layer. In the above structure, because the first insulating layer in the insulator is disposed between the second insulating layer and the strip body, and the melting point of the second insulating layer is higher than that of the first insulating layer, the insulator of the strap has good high-temperature resistance, making the insulation of the insulator less prone to failure. This reduces the possibility of short circuits between the strip body and the battery cells, which is beneficial to improving the reliability of the battery module, and thus improving the reliability of the entire battery device.

[0062] The battery device described in the embodiments of this application is applicable to electrical devices.

[0063] 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.

[0064] 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.

[0065] Please refer to Figure 1 , Figure 1This 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.

[0066] 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.

[0067] 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 a battery module. The battery module includes individual battery cells 20, which are housed within the housing 10. The housing 10 provides a space 103 for accommodating the individual battery cells 20. Multiple individual battery cells 20 are provided in the battery device 100. These cells can be connected in series, parallel, or a combination thereof to form the battery module. A combination thereof means that some of the individual battery cells 20 are connected in series and others in parallel. The battery module is housed as a whole within the housing 10.

[0068] The housing 10 may include a first housing 101 and a second housing 102, which overlap each other to define a placement space for accommodating the battery cell 20. The first housing 101 and the second housing 102 may have various shapes, such as cuboids or cylinders. The first housing 101 may be a hollow structure with one open side, and the second housing 102 may also be a hollow structure with one open side. When the open side of the second housing 102 overlaps the open side of the first housing 101, a housing 10 with a accommodating space 103 is formed.

[0069] The battery device 100 may also include other structures, for example, the battery device 100 may also include a busbar for realizing electrical connection between multiple battery cells 20.

[0070] Continue to refer to Figure 3Some embodiments of this application provide a battery module 1001, which includes a strap 30 and a plurality of battery cells 20. The strap 30 is disposed on the outside of the plurality of battery cells 20 and is used to secure the plurality of battery cells 20. (Continue to refer to...) Figures 4 to 6 The strap 30 includes a strap body 301 and an insulator 302. The insulator 302 is sleeved on the strap body 301 and covers at least a portion of the strap body 301. The insulator 302 includes a first insulating layer 3021 and a second insulating layer 3022. The first insulating layer 3021 is disposed between the second insulating layer 3022 and the strap body 301. The melting point of the second insulating layer 3022 is higher than the melting point of the first insulating layer 3021.

[0071] Multiple battery cells 20 can be arranged in a row along the first direction Y, or they can be arranged in multiple rows along the first direction Y. The straps 30 are provided on the outside of the multiple battery cells 20 and connected to the battery cells 20 to bind the multiple battery cells 20 together.

[0072] The strap 301 can be the main structure of the strap 30, serving as the primary load-bearing component. The insulator 302 can be a structure disposed on the outside of the strap 301, used to provide insulation between the strap 301 and the battery cell 20.

[0073] The insulator 302 is sleeved on the tape 301 and covers at least a portion of the tape 301, so that an insulator 302 is provided between the battery cell 20 and the tape 301, thereby achieving insulation isolation between the tape 301 and the battery cell 20. The portion of the tape 301 covered by the insulator 302 can be the portion of the tape 301 corresponding to the battery cell 20.

[0074] The first insulating layer 3021 and the second insulating layer 3022 are two structural layers stacked in the insulator 302. The first insulating layer 3021 is disposed between the second insulating layer 3022 and the tape 301, such that the second insulating layer 3022 is located outside the first insulating layer 3021.

[0075] By setting the melting point of the second insulating layer 3022 to be higher than that of the first insulating layer 3021, the insulator 302 has good high-temperature resistance.

[0076] For example, the second insulating layer 3022 covers the first insulating layer 3021, so that the outer side of the insulator 302 is the second insulating layer 3022 with high temperature resistance, so that the entire outer layer of the insulator 302 has good high temperature resistance.

[0077] In the above structure, since the first insulating layer 3021 in the insulator 302 is disposed between the second insulating layer 3022 and the tape 301, and the melting point of the second insulating layer 3022 is higher than that of the first insulating layer 3021, the insulator 302 of the strap 30 has good high temperature resistance, making the insulation of the insulator 302 less prone to failure, reducing the possibility of short circuit between the tape 301 and the battery cell 20, which is beneficial to improving the reliability of the battery module 1001, and thus improving the reliability of the entire battery device 100.

[0078] In some embodiments of this application, the melting point of the second insulating layer 3022 is T, where T ≥ 300°C.

[0079] By setting the melting point T of the second insulating layer 3022 to a range of T≥300℃, the second insulating layer 3022 has good high temperature resistance, making it less likely to melt under the high temperature and flue gas impact generated by the thermal runaway of the battery cell 20.

[0080] For example, the melting point T of the second insulating layer 3022 can also be set to T≥350℃, which is beneficial to further improve the high temperature resistance of the second insulating layer 3022, making the insulator 302 less likely to melt under the high temperature and flue gas impact generated by the thermal runaway of the battery cell 20.

[0081] In some embodiments, the first insulating layer 3021 is configured as a heat-shrinkable sleeve fitted over the outer peripheral surface of the belt 301.

[0082] The heat shrink tubing can provide insulation and protection for the tape body 301 by being fitted over it. Due to the heat shrinking property of the heat shrink tubing, the heat shrink tubing is used as the first insulating layer 3021 on the outer circumferential surface of the tape body 301, making the first insulating layer 3021 firmly set on the outer circumferential surface of the tape body 301.

[0083] In some embodiments, the first insulating layer 3021 comprises one of polycarbonate, polypropylene, and polyvinyl chloride.

[0084] The first insulating layer 3021 includes one of polycarbonate, polypropylene, and polyvinyl chloride. It can mean that the first insulating layer 3021 is made of polycarbonate, polypropylene, or polyvinyl chloride, so that the first insulating layer 3021 has a low corrosion rate, which is beneficial to improving the electrolyte corrosion resistance of the insulator 302.

[0085] In some embodiments, the second insulating layer 3022 comprises a thermoplastic composite material or mica paper.

[0086] Thermoplastic composites are composite materials composed of thermoplastic resins and reinforcing materials (such as glass fibers, carbon fibers, etc.). Mica paper can refer to paper made from mica through processing. By including thermoplastic composites or mica paper in the second insulating layer 3022, the second insulating layer 3022 has a high melting point and good insulation properties.

[0087] In some embodiments, the strap 301 may include a metallic material, such as stainless steel or aluminum; in some embodiments, the strap 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 strap 301 based on actual conditions such as the required pretension force of the strap 30.

[0088] In some embodiments, the thickness of the first insulating layer 3021 is H1, where H1 ≥ 0.08 mm.

[0089] By setting the thickness H1 of the first insulating layer 3021 to a range of H1≥0.08mm, the first insulating layer 3021 can meet the requirements of resistance to electrolyte penetration, which helps to reduce the possibility of electrolyte corrosion of the tape 301.

[0090] In some embodiments, the thickness H1 of the first insulating layer 3021 can be set to H1 ≥ 0.1 mm. For example, the thickness H1 of the first insulating layer 3021 can be set to 0.15 mm, 0.2 mm or 0.25 mm, so that the first insulating layer 3021 can meet the requirements of resistance to electrolyte penetration, which helps to reduce the possibility of the tape 301 being corroded by electrolyte.

[0091] In some embodiments, the thickness of the second insulating layer 3022 is H2, where 0.03mm ≤ H2 ≤ 0.8mm.

[0092] By setting the thickness H2 of the second insulating layer 3022 to a range of 0.03mm≤H2≤0.8mm, the second insulating layer 3022 can meet the requirements of high temperature resistance and flue gas impact resistance, while avoiding material waste due to excessive thickness.

[0093] In some embodiments, the thickness H2 of the second insulating layer 3022 can be set to a range of 0.05mm ≤ H2 ≤ 0.5mm. For example, the thickness H2 of the second insulating layer 3022 can be set to 0.1mm, 0.2mm or 0.4mm, so that the second insulating layer 3022 can meet the requirements of high temperature resistance and flue gas impact resistance, and is not prone to material waste due to excessive thickness.

[0094] In some embodiments, the battery module 1001 further includes two end plates 40 disposed opposite each other along a first direction Y, a plurality of battery cells 20 being sandwiched between the two end plates 40, and a strap 30 being connected to the end plates 40 and binding the battery cells 20 and the end plates 40 along the first direction Y.

[0095] The end plate 40 can be a plate-shaped component disposed at both ends along the first direction Y in the battery module 1001, and it can serve as a component for clamping multiple battery cells 20 in the battery module 1001. The two end plates 40 are connected by straps 30, so that the two oppositely disposed end plates 40 can apply a pre-tightening force to the multiple battery cells 20 arranged along the first direction Y, which helps to improve the overall integrity of the multiple battery cells 20.

[0096] For example, the multiple battery cells 20 between the two end plates 40 can be arranged in a row or in two closely spaced rows along the second direction X, with the battery cells 20 in each row closely arranged along the first direction Y.

[0097] In some embodiments, the strap 30 includes a first portion 303 and a second portion 304 connected to each other. The first portion 303 is close to the battery cell 20 and is provided with an insulator 302. The second portion 304 is located on the surface of the end plate 40 away from the battery cell 20 and is not provided with an insulator 302. Along the first direction Y, both ends of the insulator 302 extend beyond the side of the end plate 40 facing the battery cell 20.

[0098] The first part 303 and the second part 304 are different parts of the strap 30, which are connected to each other to share the force. The first part 303 may be a part with an insulator 302, most of which is located between the two ends, and the second part 304 may be a part without an insulator 302. The first part 303 corresponds to the battery cell 20, and the second part 304 corresponds to the end plate 40.

[0099] By extending both ends of the insulator 302 along the first direction Y beyond the side of the end plate 40 facing the battery cell 20, the insulator 302 can fully cover the portion of the strip 301 corresponding to the battery cell 20, thereby increasing the creepage distance between the battery cell 20 and the strip 301, which helps to reduce the possibility of a short circuit between the strip 301 and the battery cell 20.

[0100] In some embodiments, the strap 30 further includes a transition portion 305 connecting the first portion 303 and the second portion 304, the transition portion 305 being provided with an insulator 302.

[0101] The transition portion 305 can be used to connect the first portion 303 and the second portion 304, and it can firmly connect the first portion 303 and the second portion 304. By providing an insulator 302 on the transition portion 305, the insulator 302 extends beyond the first portion 303 and has a certain redundancy, which can better insulate the strip 301 and the battery cell 20, which is beneficial to improving the reliability of the battery module 1001, and thus improves the overall reliability of the battery device 100.

[0102] In some embodiments, the strap 30 surrounds the entire assembly of a plurality of battery cells 20 and two end plates 40, and includes two first portions 303 disposed opposite each other along a second direction X and two second portions 304 disposed opposite each other along a first direction Y, wherein the second direction X is perpendicular to the first direction Y, and the second portions 304 are connected between the two first portions 303. The second direction X is perpendicular to the first direction Y.

[0103] The strap 30 wraps around the outside of the multiple battery cells 20 and the two end plates 40 and tightens the multiple battery cells 20 and the two end plates 40, so that the multiple battery cells 20 and the two end plates 40 form an integral structure.

[0104] The strap 30 includes two first portions 303 arranged opposite each other along the second direction X and two second portions 304 arranged opposite each other along the first direction Y. The second portions 304 are connected between the two first portions 303, so that the two first portions 303 and the two second portions 304 can be connected to form a ring structure to tightly wrap around the multiple battery cells 20 and the two end plates 40.

[0105] In some embodiments, reference Figure 7 The first part 303 is connected to the second part 304 at both ends of the first direction Y, and the second part 304 is connected to the end plate 40.

[0106] The first part 303 extends along the first direction Y. By connecting the second part 304 to both ends of the first part 303 along the first direction Y, the second part 304 connected to both ends of the first part 303 can be connected to the two end plates 40 that are arranged opposite to each other along the first direction Y.

[0107] In some embodiments, reference Figure 8 The battery module 1001 includes a connector 50, and the second part 304 is connected to the end plate 40 through the connector 50.

[0108] The connector 50 may be a component used to connect the belt 301 to the end plate 40. The second part 304 is connected to the end plate 40 via the connector 50, so that the second part 304 can be firmly connected to the end plate 40 and can apply sufficient preload to the multiple battery cells 20.

[0109] For example, the connector 50 may be a connecting bolt, connecting pin, or other component that can connect the belt body 301 to the end plate 40.

[0110] For example, the belt body 301 and the end plate 40 can also be connected by welding, bonding or other methods.

[0111] In some embodiments, the end plate 40 has a recess 401 on the side opposite to the battery cell 20, the recess 401 extends to the edge of the end plate 40, and at least a portion of the second portion 304 is accommodated in the recess 401 and fits against the bottom surface of the recess 401.

[0112] By providing a recess 401 on the side of the end plate 40 away from the battery cell 20 and extending the recess 401 to the edge of the end plate 40, at least a portion of the second part 304 can easily enter the recess 401, making the connection between the second part 304 and the end plate 40 convenient. By fitting the second part 304 against the bottom surface of the recess 401, the height of the second part 304 protruding from the end plate 40 can be reduced, which helps to reduce the possibility of the battery module 1001 colliding with external components.

[0113] In some embodiments, reference Figure 9 and Figure 10 The battery cell 20 includes a housing 201, electrode terminals 202 and a pressure relief mechanism 203. The housing 201 includes a wall portion, and the electrode terminals 202 and the pressure relief mechanism 203 are spaced apart on the wall portion along the second direction X. The strap 30 is located between the electrode terminals 202 and the pressure relief mechanism 203, and the first direction Y and the second direction X are perpendicular.

[0114] The outer casing 201, as a component within the battery cell 20, forms a hollow structure to create a sealed space for housing the electrode assembly and electrolyte. The electrode terminals 202 are components within the battery cell 20 used for electrical connection to a power device, for outputting electrical energy or charging internally. The pressure relief mechanism 203 connects the sealed space inside the battery cell 20 to the outside environment. It discharges substances to reduce the pressure in the sealed space when thermal runaway occurs within the battery cell 20 and the pressure rises above a preset value.

[0115] Both the electrode terminal 202 and the pressure relief mechanism 203 are disposed on the wall. By arranging the electrode terminal 202 and the pressure relief mechanism 203 at intervals along the second direction X, and placing the strap 30 between the electrode terminal 202 and the pressure relief mechanism 203, the strap 30 is less likely to come into contact with the electrode terminal 202 and the pressure relief mechanism 203, thereby reducing the possibility of interference between the strap 30 and the electrode terminal 202 and the pressure relief mechanism 203.

[0116] In some embodiments, the corrosion resistance of the first insulating layer 3021 to the electrolyte is higher than that of the second insulating layer 3022 to the electrolyte.

[0117] By setting the corrosion resistance rate of the first insulating layer 3021 to the electrolyte to be higher than that of the second insulating layer 3022 to the electrolyte, the electrolyte corrosion resistance of the first insulating layer 3021 is better than that of the second insulating layer 3022, which is beneficial to improving the electrolyte corrosion resistance of the insulator 302.

[0118] The first insulating layer 3021 is located between the second insulating layer 3022 and the strip 301, and is protected by the second insulating layer 3022. Because the second insulating layer 3022 has good high-temperature resistance and can withstand the high-temperature impact during thermal runaway of the battery cell 20, the first insulating layer 3021, protected by the second insulating layer 3022, is less likely to be damaged by the thermal runaway of the battery cell 20. This allows the first insulating layer 3021 to maintain good resistance to electrolyte corrosion, making the insulation of the insulator 302 less prone to failure. This reduces the possibility of short circuits between the strip 301 and the battery cell 20, which is beneficial to improving the reliability of the battery module 1001, and thus improving the overall reliability of the battery device 100.

[0119] For example, the corrosion resistance of the first insulating layer 3021 to the electrolyte and the corrosion resistance of the second insulating layer 3022 to the electrolyte can be obtained by measuring the first insulating layer 3021 and the second insulating layer 3022 according to the national standard GB / T 19291-2003. The specific measurement method can be referred to the national standard GB / T19291-2003, and will not be elaborated here.

[0120] In some embodiments of this application, the battery device 100 includes a housing 10 and a battery module 1001 provided by any of the above-described technical solutions, wherein the battery module 1001 is located in the housing 10.

[0121] The housing 10 can be a component used to enclose the receiving space 103, and the battery module 1001 is disposed in the receiving space 103 within the housing 10. The housing 10 can be the first housing 101 described in the foregoing technical solution, or it can be the second housing 102 described in the foregoing technical solution.

[0122] Some embodiments of this application provide an electrical device that includes the battery device 100 provided by the above-described technical solution, the battery device 100 being used to provide electrical energy.

[0123] Some embodiments of this application provide a battery module 1001, which includes a strap 30, two end plates 40 and a plurality of battery cells 20. The two end plates 40 are arranged opposite each other along a first direction Y, and the plurality of battery cells 20 are sandwiched between the two end plates 40. The strap 30 surrounds the plurality of battery cells 20 and the two end plates 40 and tightens them to form a whole. The strap 30 includes a strap body 301 and an insulator 302. The insulator 302 is sleeved on the strap body 301 and covers the first part 303 of the strap body 301. The second part 304 connected to the first part 303 is not covered by the insulator 302. The insulator 302 includes a first insulating layer 3021 and a second insulating layer 3022. The first insulating layer 3021 is disposed between the second insulating layer 3022 and the strap body 301. The melting point of the second insulating layer 3022 is higher than that of the first insulating layer 3021. The corrosion resistance of the first insulating layer 3021 to the electrolyte is higher than that of the second insulating layer 3022 to the electrolyte. Since the first insulating layer 3021 in the insulator 302 is disposed between the second insulating layer 3022 and the tape 301, and the melting point of the second insulating layer 3022 is higher than that of the first insulating layer 3021, and the corrosion resistance of the first insulating layer 3021 to the electrolyte is higher than that of the second insulating layer 3022 to the electrolyte, the insulator 302 of the strap 30 has both good high-temperature resistance and good electrolyte corrosion resistance, making the insulation of the insulator 302 less prone to failure, reducing the possibility of short circuit between the tape 301 and the battery cell 20, and improving the reliability of the battery module 1001.

[0124] 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: Box; as well as A battery module, which is located within the housing; The battery module includes a strap and multiple battery cells. The strap is disposed on the outside of the multiple battery cells and is used to bind the multiple battery cells. The strap includes a band and an insulator. The insulator is sleeved on the band and covers at least a portion of the band. The insulator includes a first insulating layer and a second insulating layer. The first insulating layer is disposed between the second insulating layer and the band. The melting point of the second insulating layer is higher than that of the first insulating layer.

2. The battery device according to claim 1, characterized in that, The melting point of the second insulating layer is T, where T ≥ 300℃.

3. The battery device according to claim 1, characterized in that, The first insulating layer is configured as a heat-shrinkable sleeve fitted onto the outer peripheral surface of the belt.

4. The battery device according to claim 1, characterized in that, The first insulating layer comprises one of polycarbonate, polypropylene, and polyvinyl chloride.

5. The battery device according to claim 1, characterized in that, The second insulating layer comprises a thermoplastic composite material or mica paper.

6. The battery device according to claim 1, characterized in that, The thickness of the first insulating layer is H1, where H1 ≥ 0.08 mm.

7. The battery device according to claim 1, characterized in that, The thickness of the second insulating layer is H2, where 0.03mm ≤ H2 ≤ 0.8mm.

8. The battery device according to claim 7, characterized in that, 0.05mm≤H2≤0.5mm.

9. The battery device according to claim 1, characterized in that, The battery module further includes two end plates arranged opposite each other along a first direction, a plurality of battery cells are sandwiched between the two end plates, and the straps are connected to the end plates and bind the battery cells and end plates along the first direction.

10. The battery device according to claim 9, characterized in that, The strap includes a first part and a second part that are connected to each other. The first part is close to the battery cell and is provided with the insulator. The second part is located on the surface of the end plate away from the battery cell and is not covered by the insulator. Along the first direction, both ends of the insulator extend beyond the side of the end plate facing the battery cell.

11. The battery device according to claim 10, characterized in that, The strap also includes a transition portion connecting the first part and the second part, the transition portion being provided with the insulator.

12. The battery device according to claim 10, characterized in that, The strap surrounds the entire assembly consisting of the plurality of battery cells and the two end plates, and includes two first portions arranged opposite each other along a second direction and two second portions arranged opposite each other along the first direction, the second direction being perpendicular to the first direction, and the second portions being connected between the two first portions.

13. The battery device according to claim 10, characterized in that, The first part is connected to the second part at both ends in the first direction, and the second part is connected to the end plate.

14. The battery device according to claim 13, characterized in that, The battery module includes a connector, and the second part is connected to the end plate through the connector.

15. The battery device according to claim 14, characterized in that, The end plate has a recess on the side opposite to the battery cell, the recess extends to the edge of the end plate, and at least a portion of the second part is accommodated in the recess and fits against the bottom surface of the recess.

16. The battery device according to claim 9, characterized in that, The battery cell includes a housing, electrode terminals, and a pressure relief mechanism. The housing includes a wall portion, and the electrode terminals and the pressure relief mechanism are spaced apart from each other along a second direction. A portion of the strap is located between the electrode terminals and the pressure relief mechanism, and the first direction and the second direction are perpendicular.

17. The battery device according to claim 1, characterized in that, The first insulating layer has a higher corrosion resistance to electrolyte than the second insulating layer.

18. An electrical appliance, characterized in that, Includes a battery device as described in any one of claims 1-17, the battery device being used to provide electrical energy.

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