Battery apparatus and electrical apparatus

Abstract

The present application provides a battery apparatus and an electrical apparatus. Straps in a battery module comprised in the battery apparatus are arranged on the outer sides of a plurality of battery cells and restrain the plurality of battery cells; an insulator in each strap is sleeved on a strap body and covers at least part of the strap body, the insulator comprising a first insulating layer and a second insulating layer, the first insulating layer being arranged between the second insulating layer and the strap body, and the melting point of the second insulating layer being higher than the melting point of the first insulating layer. The first insulating layer in each insulator is arranged between a second insulating layer and a strap body, and the melting point of the second insulating layer is higher than the melting point of the first insulating layer, such that the insulators of the straps have good high-temperature resistance, and the insulation of the insulators is not prone to failure, thereby reducing the possibility of short circuits between strap bodies and battery cells, and further improving the overall reliability of battery apparatuses.

Description

Battery device and electric device Cross-reference to related applications

[0001] This application claims priority to Chinese Patent Application No. 202411086164.0, filed on August 8, 2024, entitled “Battery device and electric device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a battery device and an electric device. BACKGROUND

[0003] Batteries have high specific energy and high power density, and are widely used in electronic devices and vehicles, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships, and electric tools, etc.

[0004] With the continuous expansion of the application field of batteries, how to improve the reliability of batteries has attracted more and more attention from those skilled in the art. SUMMARY

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

[0006] In a first aspect, some embodiments of the present application provide a battery device, which comprises a box body and a battery module, wherein the battery module is located in the box body, the battery module comprises a binding belt and a plurality of battery monomers, the binding belt is arranged on the outer side of the plurality of battery monomers and is used to bind the plurality of battery monomers; the binding belt comprises a belt body and an insulating body, the insulating body is sleeved on the belt body and covers at least part of the belt body, the insulating body comprises a first insulating layer and a second insulating layer, the first insulating layer is arranged between the second insulating layer and the belt body, and the melting point of the second insulating layer is higher than that of the first insulating layer.

[0007] In the above structure, since the first insulating layer in the insulating body is arranged between the second insulating layer and the belt body, and the melting point of the second insulating layer is higher than that of the first insulating layer, the insulating body of the binding belt has good high-temperature resistance, so that the insulation of the insulating body is not easy to fail, reducing the possibility of short circuit of the belt body and the battery monomers, which is beneficial to improve the reliability of the battery module, and further improve the overall reliability of the battery device.

[0008] According to the battery device provided by some embodiments of the present application, the melting point of the second insulating layer is T, T≥300℃, so that the second insulating layer has good high-temperature resistance and is not easy to melt under the high temperature and smoke impact generated by the thermal runaway of the battery monomers.

[0009] According to the battery device provided by some embodiments of the present application, the first insulation layer is configured as a heat-shrinkable sleeve wrapped on the outer circumferential surface of the belt. Since the heat-shrinkable sleeve has the characteristic of heat shrinkage, the use of the heat-shrinkable sleeve as the first insulation layer wrapped on the outer circumferential surface of the belt makes the first insulation layer firmly arranged on the outer circumferential surface of the belt.

[0010] According to the battery device provided by some embodiments of the present application, the first insulation layer comprises one of polycarbonate, polypropylene and polyvinyl chloride. The first insulation layer has a small corrosion rate, which is conducive to improving the electrolyte corrosion resistance of the insulation body.

[0011] According to the battery device provided by some embodiments of the present application, the second insulation layer comprises thermoplastic composite material or mica paper, so that the second insulation layer has a high melting point and good insulation.

[0012] According to the battery device provided by some embodiments of the present application, the thickness of the first insulation layer is H1, and H1≥0.08mm, so that the first insulation layer can meet the requirement of resisting electrolyte penetration, and the possibility of corrosion of the belt by electrolyte is reduced.

[0013] According to the battery device provided by some embodiments of the present application, the thickness of the second insulation layer is H2, and 0.03mm≤H2≤0.8mm, so that the second insulation layer can meet the requirements of resisting high temperature and resisting smoke impact, and the material is not easily wasted due to excessive thickness.

[0014] According to the battery device provided by some embodiments of the present application, 0.05mm≤H2≤0.5mm, so that the second insulation layer can meet the requirements of resisting high temperature and resisting smoke impact, and the material is not easily wasted due to excessive thickness.

[0015] According to the battery device provided by some embodiments of the present application, the battery module further comprises two end plates oppositely arranged along the first direction, and the plurality of battery monomers are clamped between the two end plates, and the binding belt is connected with the end plates and binds the battery monomers and the end plates along the first direction. The two end plates are connected by the binding belt, so that the two oppositely arranged end plates can apply a pre-tightening force to the plurality of battery monomers arranged along the first direction, which is conducive to improving the integrity of the plurality of battery monomers.

[0016] According to the battery device provided by some embodiments of the present application, the bandage includes a first part and a second part connected to each other, the first part is close to the battery cell and is provided with an insulator, and the second part is located on the surface of the end plate away from the battery cell and is not provided with an insulator. In the first direction, both ends of the insulator exceed the side of the end plate facing the battery cell. By making both ends of the insulator exceed the side of the end plate facing the battery cell in the first direction, the insulator can sufficiently cover the part corresponding to the battery cell of the bandage, increase the creepage distance between the battery cell and the bandage, and help to reduce the possibility of short circuit between the bandage and the battery cell.

[0017] According to the battery device provided by some embodiments of the present application, the bandage further includes a transition part connecting the first part and the second part, and the transition part is provided with an insulator. By providing the transition part with an insulator, the insulator exceeds the first part and has a certain redundancy, which can better insulate the bandage and the battery cell, help to improve the reliability of the battery module, and further improve the overall reliability of the battery device.

[0018] According to the battery device provided by some embodiments of the present application, the bandage surrounds the whole formed by the plurality of battery cells and the two end plates, and includes two first parts arranged opposite to each other in a second direction and two second parts arranged opposite to each other in a first direction, the second direction is perpendicular to the first direction, and the second part is connected between the two first parts.

[0019] According to the battery device provided by some embodiments of the present application, the first part is connected with the second part at both ends in the first direction, and the second part is connected to the end plate. By connecting the second part at both ends of the first part in the first direction, the second parts connected to both ends of the first part can be respectively connected to the two end plates arranged opposite to each other in the first direction.

[0020] According to the battery device provided by some embodiments of the present application, the battery module includes a connecting piece, and the second part is connected to the end plate through the connecting piece. The second part is connected to the end plate through the connecting piece, so that the second part can be firmly connected to the end plate and can exert sufficient pre-tightening force on the plurality of battery cells.

[0021] According to the battery device provided by some embodiments of the present application, the side of the end plate away from the battery cell is provided with a recess, the recess extends to the edge of the end plate, and at least part 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 collision between the battery module in the battery device and external components.

[0022] According to the battery device provided by some embodiments of the present application, the battery cell comprises a shell, an electrode terminal and a pressure relief mechanism, the shell comprises a wall portion, the electrode terminal and the pressure relief mechanism are arranged in the wall portion in a second direction, and the binding belt is located between the electrode terminal and the pressure relief mechanism, and the first direction and the second direction are perpendicular. By arranging the electrode terminal and the pressure relief mechanism in the second direction and locating the binding belt between the electrode terminal and the pressure relief mechanism, the binding belt is less likely to contact the electrode terminal and the pressure relief mechanism, and the possibility of interference between the binding belt and the electrode terminal and the pressure relief mechanism is reduced.

[0023] According to the battery device provided by some embodiments of the present application, the corrosion resistance of the first insulating layer to the electrolyte is higher than that of the second insulating layer to the electrolyte. Since the second insulating layer has good high-temperature resistance and can withstand the high-temperature impact in the thermal runaway of the battery cell, the first insulating layer protected by the second insulating layer is less likely to be damaged due to the thermal runaway of the battery cell, so that the first insulating layer can maintain good electrolyte corrosion resistance, the insulation of the insulator is less likely to fail, the possibility of short circuit between the belt body and the battery cell is reduced, and the reliability of the battery module is improved, thereby improving the overall reliability of the battery device.

[0024] In a second aspect, some embodiments of the present application provide a power utilization device, which comprises the battery device provided in the above technical solutions, and the battery device is used to provide electric energy.

[0025] The technical solutions provided by the embodiments of the present application at least have the following beneficial effects:

[0026] The present application provides a battery device, which comprises a battery module and a box body, wherein the battery module is located in the box body, the battery module comprises a binding belt and a plurality of battery cells, the binding belt is arranged outside the plurality of battery cells and is used to bind the plurality of battery cells; the binding belt comprises a belt body and an insulator, the insulator is sleeved on the belt body and covers at least part of the belt 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 belt body, and the melting point of the second insulating layer is higher than that of the first insulating layer. In the above structure, since the first insulating layer in the insulator is arranged between the second insulating layer and the belt body, and the melting point of the second insulating layer is higher than that of the first insulating layer, the insulator of the binding belt has good high-temperature resistance, the insulation of the insulator is less likely to fail, the possibility of short circuit between the belt body and the battery cell is reduced, and the reliability of the battery module is improved, thereby improving the overall reliability of the battery device.

[0027] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0028] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a better understanding of the preferred embodiments, and are not intended to be a limitation on the scope of the application. Moreover, in the drawings, like reference numerals refer to similar components, and:

[0029] FIG. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application;

[0030] FIG. 2 is a split view of a battery device according to some embodiments of the present application;

[0031] FIG. 3 is a structural schematic diagram of a battery module according to some embodiments of the present application;

[0032] FIG. 4 is a structural schematic diagram of a strap in a battery module according to some embodiments of the present application;

[0033] FIG. 5 is a sectional view of A-A in FIG. 4;

[0034] FIG. 6 is an enlarged view of B in FIG. 5;

[0035] FIG. 7 is a structural schematic diagram of a strap in a battery module according to some other embodiments of the present application;

[0036] FIG. 8 is a structural schematic diagram of a battery module according to some other embodiments of the present application;

[0037] FIG. 9 is a structural schematic diagram of a battery module according to some further embodiments of the present application;

[0038] FIG. 10 is a structural schematic diagram of a battery module according to some yet further embodiments of the present application.

[0039] In the drawings:

[0040] 10, case; 101, first case; 102, second case; 103, accommodation space;

[0041] 20, battery cell; 201, housing; 202, electrode terminal; 203, pressure relief mechanism;

[0042] 30, strap; 301, strap body; 302, insulator; 3021, first insulating layer; 3022, second insulating layer; 303, first portion; 304, second portion; 305, transition portion;

[0043] 40, end plate; 401, recess;

[0044] 50, connecting member;

[0045] 1000, vehicle; 100, battery device; 1001, battery module; 200, controller; 300, motor; X, second direction; Y, first direction. DETAILED DESCRIPTION

[0046] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0047] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be understood as the usual meaning understood by the skilled person in the field to which the embodiments of the present application belong.

[0048] In the description of the embodiments of the present application, the orientations or positional relationships indicated by 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" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0049] In addition, the technical terms "first", "second" and the like are only for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0050] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0051] In the description of the embodiments of the present application, unless explicitly defined and limited otherwise, a first feature "on" or "under" a second feature can mean that the first and second features are directly in contact, or that the first and second features are indirectly in contact through an intermediate medium. Also, the first feature "over", "above", and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature "under", "below", and "underneath" the second feature can mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0052] At present, from the development of market situation, the application of battery is more and more extensive. The battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, electric vehicles, military equipment and aerospace and other fields. With the continuous expansion of the application field of battery, people's requirements for battery are also constantly improving.

[0053] The battery device mentioned in the embodiments of the present application refers to a single physical module including one or more battery monomers to provide higher voltage and capacity.

[0054] Among them, the battery monomer can be a secondary battery monomer, which refers to a battery monomer that can be activated by charging after discharging the battery monomer.

[0055] The battery monomer can be a lithium ion battery monomer, a sodium ion battery monomer, a sodium lithium ion battery monomer, a lithium metal battery monomer, a sodium metal battery monomer, a lithium sulfur battery monomer, a magnesium ion battery monomer, a nickel hydrogen battery monomer, a nickel cadmium battery monomer, a lead storage battery monomer, etc.

[0056] As an example, the battery monomer can be a cylindrical battery monomer, a prismatic battery monomer, a soft package battery monomer or other shaped battery monomers, the prismatic battery monomer includes a square shell battery monomer, a blade-shaped battery monomer, a multi-prismatic battery, such as a hexagonal prism battery, etc.

[0057] In some embodiments, the battery device can be a battery pack, which includes a box body and a battery monomer or a battery module contained in the box body.

[0058] In some embodiments, the box body can be part of the chassis structure of the vehicle. For example, part of the box body can be at least part of the floor of the vehicle, or part of the box body can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0059] In some embodiments, the battery device can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0060] In some embodiments, the battery device can be without the box, directly as a battery module, when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0061] The multiple battery cells in the battery module are usually bound as a whole by the binding belt. However, the insulation protection on the binding belt in the prior art does not take into account the high temperature, smoke impact and electrolyte corrosion in the thermal runaway of the battery cell, which will damage the insulation protection on the binding belt, and there is a risk of failure of the insulation between the battery cell and the binding belt, which is not conducive to improving the reliability of the battery module.

[0062] In order to improve the reliability of the battery module, the battery module includes a binding belt and a plurality of battery cells, the binding belt is arranged outside the plurality of battery cells and is used to bind the plurality of battery cells; the binding belt includes a belt body and an insulator, the insulator is sleeved on the belt body and covers at least part of the belt body, the insulator includes a first insulating layer and a second insulating layer, the first insulating layer is arranged between the second insulating layer and the belt body, and the melting point of the second insulating layer is higher than that of the first insulating layer. In the above structure, since the first insulating layer in the insulator is arranged between the second insulating layer and the belt body, and the melting point of the second insulating layer is higher than that of the first insulating layer, the insulator of the binding belt has good high temperature resistance, the insulation of the insulator is not easy to fail, the short circuit of the belt body and the battery cell is reduced, which is conducive to improving the reliability of the battery module, and further improving the reliability of the whole battery device.

[0063] The battery device described in the embodiments of the present application is suitable for an electric device.

[0064] The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, for example, a game machine, an electric automobile toy, an electric ship toy and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc. Since the electric device includes the battery device provided in the above technical solutions, the electric device has good reliability.

[0065] The following embodiments take a vehicle as an example for convenience of description.

[0066] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid automobile, or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0067] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0068] Please refer to FIG. 2, which is an exploded view of the battery device 100 according to some embodiments of the present application. The battery device 100 includes a box body 10 and a battery module, and the battery module includes battery monomers 20, which are accommodated in the box body 10. The box body 10 is used to provide an accommodation space 103 for the battery monomers 20. The battery monomers 20 in the battery device 100 are provided in plurality, and the plurality of battery monomers 20 can be connected in series, in parallel, or in a mixed connection to form a battery module. The mixed connection means that the plurality of battery monomers 20 are connected in series and in parallel. The battery module is accommodated in the box body 10 as a whole.

[0069] The box body 10 can include a first box body 101 and a second box body 102, and the first box body 101 and the second box body 102 are overlapped with each other to define a placement space for accommodating the battery monomers 20. The first box body 101 and the second box body 102 can be various shapes, such as a cuboid, a cylinder, etc. The first box body 101 can be a hollow structure with one side open, and the second box body 102 can also be a hollow structure with one side open. The open side of the second box body 102 is overlapped with the open side of the first box body 101, and then the box body 10 with the accommodation space 103 is formed.

[0070] The battery device 100 can further include other structures, for example, the battery device 100 can further include a current collecting component for realizing electrical connection between the plurality of battery monomers 20.

[0071] With reference back to FIG. 3, some embodiments of the present application provide a battery module 1001 including a plurality of battery cells 20 and a binding belt 30 disposed outside the plurality of battery cells 20 and used to bind the plurality of battery cells 20. With reference to FIGS. 4-6, the binding belt 30 includes a belt body 301 and an insulating body 302 sleeved on the belt body 301 and covering at least part of the belt body 301, the insulating body 302 including a first insulating layer 3021 and a second insulating layer 3022, the first insulating layer 3021 being disposed between the second insulating layer 3022 and the belt body 301, the second insulating layer 3022 having a higher melting point than the first insulating layer 3021.

[0072] The plurality of battery cells 20 can be arranged in a row along the first direction Y or arranged in multiple rows along the first direction Y. The binding belt 30 binds the plurality of battery cells 20 by being disposed outside the plurality of battery cells 20 and connected with the battery cells 20.

[0073] The belt body 301 can be a main structure in the binding belt 30, which serves as a part mainly bearing load in the binding belt 30. The insulating body 302 can be a structure disposed outside the belt body 301, which serves to insulate and isolate the belt body 301 from the battery cells 20.

[0074] The insulating body 302 is sleeved on the belt body 301 and covers at least part of the belt body 301, so that the insulating body 302 is disposed between the battery cells 20 and the belt body 301, and insulation and isolation between the belt body 301 and the battery cells 20 is achieved. The part of the belt body 301 covered by the insulating body 302 can be a part of the belt body 301 corresponding to the battery cells 20.

[0075] The first insulating layer 3021 and the second insulating layer 3022 are two structure layers stacked in the insulating body 302, respectively. The first insulating layer 3021 is disposed between the second insulating layer 3022 and the belt body 301, so that the second insulating layer 3022 is located outside the first insulating layer 3021.

[0076] By setting the melting point of the second insulating layer 3022 to be higher than the melting point of the first insulating layer 3021, the insulating body 302 has good high-temperature resistance.

[0077] Exemplarily, the second insulating layer 3022 covers the first insulating layer 3021, so that the outside of the insulating body 302 is the second insulating layer 3022 having high-temperature resistance, and the entire outer layer of the insulating body 302 has good high-temperature resistance.

[0078] In the above structure, since the first insulating layer 3021 in the insulator 302 is arranged between the second insulating layer 3022 and the band body 301, the melting point of the second insulating layer 3022 is higher than that of the first insulating layer 3021, so that the insulator 302 of the band 30 has good high-temperature resistance, so that the insulation of the insulator 302 is not easy to fail, reducing the possibility of short circuit between the band body 301 and the battery monomer 20, which is beneficial to improve the reliability of the battery module 1001, thereby improving the reliability of the entire battery device 100.

[0079] In some embodiments of the present application, the melting point of the second insulating layer 3022 is T, and T≥300℃.

[0080] By setting the range of the melting point T of the second insulating layer 3022 to T≥300℃, the second insulating layer 3022 has good high-temperature resistance, so that it is not easy to melt under the high temperature and smoke impact generated by the thermal runaway of the battery monomer 20.

[0081] Exemplarily, the range of 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, so that the insulator 302 is not easy to melt under the high temperature and smoke impact generated by the thermal runaway of the battery monomer 20.

[0082] In some embodiments, the first insulating layer 3021 is configured as a heat-shrinkable sleeve that is sleeved on the outer circumferential surface of the band body 301.

[0083] The heat-shrinkable sleeve can insulate and protect the band body 301 by being sleeved on the band body 301. Since the heat-shrinkable sleeve has the characteristic of heat shrinkage, using the heat-shrinkable sleeve as the first insulating layer 3021 that is sleeved on the outer circumferential surface of the band body 301 makes the arrangement of the first insulating layer 3021 on the outer circumferential surface of the band body 301 firm.

[0084] In some embodiments, the first insulating layer 3021 includes one of polycarbonate, polypropylene, and polyvinyl chloride.

[0085] The first insulating layer 3021 includes one of polycarbonate, polypropylene, and polyvinyl chloride, which means that the first insulating layer 3021 is made of polycarbonate, polypropylene, or polyvinyl chloride, so that the first insulating layer 3021 has a small corrosion rate, which is beneficial to improve the electrolyte corrosion resistance of the insulator 302.

[0086] In some embodiments, the second insulating layer 3022 includes a thermoplastic composite material or mica paper.

[0087] The thermoplastic composite material is a composite material composed of a thermoplastic resin and a reinforcing material (such as glass fiber, carbon fiber, etc.). The mica paper can refer to paper made of mica after processing. By making the second insulation layer 3022 include a thermoplastic composite material or mica paper, the second insulation layer 3022 has a high melting point and good insulation.

[0088] In some embodiments, the belt body 301 can include a metal material, for example, stainless steel or aluminum material can be used; in some embodiments, the belt body can also use a composite material of a metal layer combined with a non-metal layer, for example, a stainless steel layer combined with a nylon layer, etc. A person skilled in the art can select the material of the belt body 301 according to the actual situation of the pre-tightening force required by the belt 30, etc.

[0089] In some embodiments, the thickness of the first insulation layer 3021 is H1, and H1≥0.08mm.

[0090] By setting the thickness H1 of the first insulation layer 3021 in the range of H1≥0.08mm, the first insulation layer 3021 can meet the requirements of resisting electrolyte penetration, which is beneficial to reduce the possibility of corrosion of the belt body 301 by electrolyte.

[0091] In some embodiments, the thickness H1 of the first insulation layer 3021 can be set in the range of H1≥0.1mm. For example, the thickness H1 of the first insulation layer 3021 can be set to 0.15mm, 0.2mm or 0.25mm, so that the first insulation layer 3021 can meet the requirements of resisting electrolyte penetration, which is beneficial to reduce the possibility of corrosion of the belt body 301 by electrolyte.

[0092] In some embodiments, the thickness of the second insulation layer 3022 is H2, and 0.03mm≤H2≤0.8mm.

[0093] By setting the thickness H2 of the second insulation layer 3022 in the range of 0.03mm≤H2≤0.8mm, the second insulation layer 3022 can meet the requirements of resisting high temperature and resisting smoke impact, and is not easy to cause material waste due to excessive thickness.

[0094] In some embodiments, the thickness H2 of the second insulation layer 3022 can be set in the range of 0.05mm≤H2≤0.5mm. For example, the thickness H2 of the second insulation layer 3022 can be set to 0.1mm, 0.2mm or 0.4mm, so that the second insulation layer 3022 can meet the requirements of resisting high temperature and resisting smoke impact, and is not easy to cause material waste due to excessive thickness.

[0095] In some embodiments, the battery module 1001 further comprises two end plates 40 arranged opposite to each other along the first direction Y, and the plurality of battery cells 20 are clamped between the two end plates 40, and the binding belt 30 is connected to the end plates 40 and binds the battery cells 20 and the end plates 40 along the first direction Y.

[0096] The end plate 40 can be a plate-shaped component arranged at both ends of the battery module 1001 along the first direction Y, which can serve as a component for clamping the plurality of battery cells 20 in the battery module 1001. The two end plates 40 are connected by the binding belt 30, so that the two oppositely arranged end plates 40 can apply a pre-tightening force to the plurality of battery cells 20 arranged along the first direction Y, which is conducive to improving the integrity of the plurality of battery cells 20.

[0097] Exemplarily, the plurality of battery cells 20 between the two end plates 40 can be arranged in one row, or can be arranged in two rows close to each other along the second direction X, and the battery cells 20 in each row are closely arranged along the first direction Y.

[0098] In some embodiments, the binding belt 30 comprises 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, and 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 the insulator 302; along the first direction Y, both ends of the insulator 302 exceed the side of the end plate 40 facing the battery cell 20.

[0099] The first portion 303 and the second portion 304 are different portions in the binding belt 30, and are connected to each other for jointly bearing the force. The first portion 303 can be the portion provided with the insulator 302, most of which is located between the two ends, and the second portion 304 can be the portion not provided with the insulator 302, the first portion 303 corresponds to the battery cell 20, and the second portion 304 corresponds to the end plate 40.

[0100] By making both ends of the insulator 302 along the first direction Y exceed the side of the end plate 40 facing the battery cell 20, the insulator 302 can sufficiently cover the portion of the belt body 301 corresponding to the battery cell 20, increase the creepage distance between the battery cell 20 and the belt body 301, and reduce the possibility of short circuit between the belt body 301 and the battery cell 20.

[0101] In some embodiments, the binding belt 30 further comprises a transition portion 305 connecting the first portion 303 and the second portion 304, and the transition portion 305 is provided with the insulator 302.

[0102] The transition portion 305 can be a portion for connecting the first portion 303 and the second portion 304, and can firmly connect the first portion 303 and the second portion 304. By providing the insulator 302 on the transition portion 305, the insulator 302 extends beyond the first portion 303, has a certain redundancy, and can better insulate the belt 301 and the battery monomer 20, which is conducive to improving the reliability of the battery module 1001, and further improves the reliability of the battery device 100 as a whole.

[0103] In some embodiments, the belt 30 encircles the whole formed by the plurality of battery monomers 20 and the two end plates 40, and includes two first portions 303 arranged opposite to each other along a second direction X and two second portions 304 arranged opposite to each other along a first direction Y, the second direction X being perpendicular to the first direction Y, and the second portions 304 being connected between the two first portions 303. The second direction X is perpendicular to the first direction Y.

[0104] The belt 30 encircles the plurality of battery monomers 20 and the two end plates 40 by being wrapped around the outside of the plurality of battery monomers 20 and the two end plates 40 and tightening the plurality of battery monomers 20 and the two end plates 40, so as to form a whole structure.

[0105] The belt 30 includes two first portions 303 arranged opposite to each other along a second direction X and two second portions 304 arranged opposite to each other along a first direction Y, the second portions 304 being 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, so as to encircle and tighten the plurality of battery monomers 20 and the two end plates 40.

[0106] In some embodiments, referring to FIG. 7, the first portion 303 is connected with the second portion 304 at both ends along the first direction Y, and the second portion 304 is connected to the end plate 40.

[0107] The first portion 303 extends along the first direction Y, and by connecting the first portion 303 with the second portion 304 at both ends along the first direction Y, the second portions 304 connected to the first portion 303 at both ends can be respectively connected to the two end plates 40 arranged opposite to each other along the first direction Y.

[0108] In some embodiments, referring to FIG. 8, the battery module 1001 includes a connecting piece 50, and the second portion 304 is connected to the end plate 40 through the connecting piece 50.

[0109] The connecting piece 50 can be a component for connecting the belt 301 and the end plate 40. The second portion 304 is connected to the end plate 40 through the connecting piece 50, so that the second portion 304 can be firmly connected to the end plate 40, and can apply sufficient pre-tightening force to the plurality of battery monomers 20.

[0110] Exemplarily, the connecting member 50 can be a connecting bolt, a connecting pin or the like, which can connect the band 301 to the end plate 40.

[0111] Exemplarily, the band 301 and the end plate 40 can also be connected by welding, bonding or the like.

[0112] In some embodiments, the side of the end plate 40 facing away from the battery cell 20 is provided with a recess 401, the recess 401 extending to the edge of the end plate 40, and at least part of the second portion 304 is accommodated in the recess 401 and abuts the bottom surface of the recess 401.

[0113] By providing the recess 401 on the side of the end plate 40 facing away from the battery cell 20 and extending the recess 401 to the edge of the end plate 40, at least part of the second portion 304 can conveniently enter the recess 401, so that the connection of the second portion 304 and the end plate 40 is convenient; by abutting the second portion 304 and the bottom surface of the recess 401, the height of the second portion 304 protruding from the end plate 40 can be reduced, which is beneficial to reduce the possibility of collision between the battery module 1001 and external components.

[0114] In some embodiments, referring to FIGS. 9 and 10, the battery cell 20 includes a shell 201, an electrode terminal 202 and a pressure relief mechanism 203, the shell 201 includes a wall portion, the electrode terminal 202 and the pressure relief mechanism 203 are arranged at intervals along a second direction X on the wall portion; the band 30 is located between the electrode terminal 202 and the pressure relief mechanism 203, and the first direction Y and the second direction X are perpendicular.

[0115] The shell 201 is a component for enclosing a sealed space in the battery cell 20, which is used to enclose a hollow structure to form a sealed space for accommodating an electrode assembly and an electrolyte. The electrode terminal 202 can be a component for electrically connecting with an electric device in the battery cell 20, which is used to output electric energy to the outside or charge to the inside. The pressure relief mechanism 203 can be a mechanism for connecting the sealed space inside the battery cell 20 with the outside, which is used to discharge a release substance to the outside when the pressure in the sealed space of the battery cell 20 increases above a preset value due to thermal runaway, so as to reduce the pressure in the sealed space.

[0116] The electrode terminal 202 and the pressure relief mechanism 203 are both arranged on the wall portion, by arranging the electrode terminal 202 and the pressure relief mechanism 203 at intervals along the second direction X and locating the band 30 between the electrode terminal 202 and the pressure relief mechanism 203, the band 30 is less likely to contact the electrode terminal 202 and the pressure relief mechanism 203, which reduces the possibility of interference between the band 30 and the electrode terminal 202 and the pressure relief mechanism 203.

[0117] In some embodiments, the corrosion resistance of the first insulating layer 3021 to the electrolyte is higher than the corrosion resistance of the second insulating layer 3022 to the electrolyte.

[0118] By setting the corrosion resistance to electrolyte of the first insulating layer 3021 to be higher than the corrosion resistance to electrolyte of the second insulating layer 3022, the electrolyte corrosion resistance of the first insulating layer 3021 is better than that of the second insulating layer 3022, which is conducive to improving the electrolyte corrosion resistance of the insulator 302.

[0119] The first insulating layer 3021 is located between the second insulating layer 3022 and the belt body 301, and is protected by the second insulating layer 3022. Since the second insulating layer 3022 has good high-temperature resistance and can withstand the high-temperature impact when the battery monomer 20 is in thermal runaway, the first insulating layer 3021 protected by the second insulating layer 3022 is less likely to be damaged due to thermal runaway of the battery monomer 20, so that the first insulating layer 3021 can maintain good electrolyte corrosion resistance, so that the insulator 302 is less likely to fail, reducing the possibility of short circuit between the belt body 301 and the battery monomer 20, which is conducive to improving the reliability of the battery module 1001, and further improving the overall reliability of the battery device 100.

[0120] Exemplarily, the corrosion resistance to electrolyte of the first insulating layer 3021 and the corrosion resistance to electrolyte of the second insulating layer 3022 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 refer to the national standard GB / T 19291-2003, which will not be described here.

[0121] The battery device 100 in some embodiments of the present application includes a box 10 and a battery module 1001 provided by any of the technical solutions described above, and the battery module 1001 is located in the box 10.

[0122] The box 10 can be a component for enclosing a containing space 103, and the battery module 1001 is arranged in the containing space 103 in the box 10. The box 10 can be the first box 101 described in the foregoing technical solutions, or the second box 102 described in the foregoing technical solutions.

[0123] Some embodiments of the present application provide a power utilization device, which includes the battery device 100 provided by the technical solutions described above, and the battery device 100 is used to provide electric energy.

[0124] Some embodiments of the application provide a battery module 1001, the battery module 1001 comprising a binding belt 30, two end plates 40 and a plurality of battery monomers 20, the two end plates 40 being oppositely arranged along a first direction Y, the plurality of battery monomers 20 being clamped between the two end plates 40, and the binding belt 30 being wrapped around the plurality of battery monomers 20 and the two end plates 40 and being tightened to form a whole. Wherein the binding belt 30 comprises a belt body 301 and an insulating body 302, the insulating body 302 being sleeved on the belt body 301 and covering a first part 303 of the belt body 301, a second part 304 connected with the first part 303 being not covered by the insulating body 302, the insulating body 302 comprising a first insulating layer 3021 and a second insulating layer 3022, the first insulating layer 3021 being arranged between the second insulating layer 3022 and the belt body 301, the melting point of the second insulating layer 3022 being higher than that of the first insulating layer 3021, and the corrosion resistance of the first insulating layer 3021 to electrolyte being higher than that of the second insulating layer 3022 to electrolyte. Since the first insulating layer 3021 in the insulating body 302 is arranged between the second insulating layer 3022 and the belt body 301, 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 electrolyte is higher than that of the second insulating layer 3022 to electrolyte, the insulating body 302 of the binding belt 30 has good high-temperature resistance and good electrolyte corrosion resistance, so that the insulation of the insulating body 302 is not easy to fail, the short circuit of the belt body 301 and the battery monomer 20 is reduced, and the reliability of the battery module 1001 is improved.

[0125] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application, and they should be covered in the scope of the claims and the specification of the application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, comprising: a box body; and a battery module located in the box body; the battery module comprises a plurality of battery cells and a binding belt arranged outside the plurality of battery cells and used for binding the plurality of battery cells; the binding belt comprises a belt body and an insulating body sleeved on the belt body and covering at least part of the belt body, the insulating body comprises a first insulating layer and a second insulating layer, the first insulating layer is arranged between the second insulating layer and the belt body, and the melting point of the second insulating layer is higher than the melting point of the first insulating layer. The melting point of the second insulating layer is T, and T≥300℃.

2. The battery device of claim 1, wherein, The first insulating layer is configured as a heat-shrinkable sleeve sleeved on the outer circumferential surface of the belt body.

3. The battery device according to claim 1 or 2, wherein The first insulating layer comprises one of polycarbonate, polypropylene and polyvinyl chloride.

4. The battery device according to any one of claims 1 to 3, wherein The second insulating layer comprises a thermoplastic composite material or mica paper.

5. The battery device according to any one of claims 1 to 4, wherein The thickness of the first insulating layer is H1, and H1≥0.08mm.

6. The battery device according to any one of claims 1 to 5, wherein The thickness of the second insulating layer is H2, and 0.03mm≤H2≤0.8mm.

7. The battery device according to any one of claims 1 to 6, wherein 0.05mm≤H2≤0.5mm.

8. The battery device of claim 7, wherein, The battery module further comprises two end plates oppositely arranged along a first direction, the plurality of battery cells are clamped between the two end plates, the binding belt is connected with the end plates and binds the battery cells and the end plates along the first direction.

9. The battery device according to any one of claims 1 to 8, wherein The binding belt comprises a first part and a second part connected with each other, the first part is close to the battery cells and is provided with the insulating body, and the second part is located on the surface of the end plate away from the battery cells and is not provided with the insulating body.

10. The battery device of claim 9, wherein, Along the first direction, both ends of the insulating body exceed the end plate and face the side of the battery cell. The binding belt further comprises a transition part connecting the first part and the second part, and the transition part is provided with the insulating body.

11. The battery device of claim 10, wherein, The binding belt surrounds the whole of the plurality of battery cells and the two end plates, and comprises two first parts oppositely arranged along a second direction and two second parts oppositely arranged along the first direction, the second direction is perpendicular to the first direction, and the second part is connected between the two first parts.

12. The battery device according to claim 10 or 11, wherein, Both ends of the first part in the first direction are connected with the second part, and the second part is connected to the end plate.

13. The battery device according to any one of claims 10 to 12, wherein, The battery module comprises a connecting piece, and the second part is connected to the end plate through the connecting piece.

14. The battery device of claim 13, wherein, The side of the end plate away from the battery cell is provided with a recess, the recess extends to the edge of the end plate, at least part of the second part is accommodated in the recess and is attached to the bottom surface of the recess.

15. The battery device of claim 14, wherein, The battery cell comprises a shell, an electrode terminal and a pressure relief mechanism, the shell comprises a wall part, the electrode terminal and the pressure relief mechanism are arranged at intervals along a second direction on the wall part; a part of the binding belt is located between the electrode terminal and the pressure relief mechanism, and the first direction is perpendicular to the second direction.

16. The battery device of any one of claims 9-15, wherein, The corrosion resistance of the first insulating layer to electrolyte is higher than that of the second insulating layer to electrolyte.

17. The battery device of any one of claims 1-16, wherein, ​ 18. An electrically powered device comprising the battery device of any one of claims 1-17, the battery device being used to provide electrical power.

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