Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device. The battery device comprises a box body, a battery module and a first reinforcing structure, the battery module comprises a second single battery arranged in the box body; the first reinforcing structure comprises two supporting plates and a plurality of first single batteries clamped between the two supporting plates, and the two ends of the supporting plates are connected with the box body; the expansion coefficient of the first battery cell is smaller than that of the second battery cell. The energy density of the battery monomer can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery device and a power utilization device. BACKGROUND

[0002] In recent years, with the rapid development of new energy technology, new energy vehicles are increasingly widely used and gradually replace traditional fuel vehicles to become one of the mainstream transportation tools. As the power source of new energy vehicles, power batteries are one of the core equipment of new energy vehicles.

[0003] In the development of battery technology, how to improve the energy density of the battery device is a research direction in the battery technology. CONTENT OF THE INVENTION

[0004] The embodiments of the present application provide a battery device and a power utilization device, which can improve the energy density of the battery device.

[0005] In a first aspect, the embodiments of the present application provide a battery device, which comprises a box body, a battery module and a first reinforcing structure; the battery module comprises a second battery monomer arranged in the box body; the first reinforcing structure comprises two support plates and a plurality of first battery monomers clamped between the two support plates, and the two ends of the support plate are connected with the box body; the expansion coefficient of the first battery monomer is smaller than that of the second battery monomer.

[0006] In the above scheme, the first battery monomer with a lower expansion coefficient is combined with the support plate as a reinforcing structure to serve as a cross beam and / or a longitudinal beam of the box body, thereby saving the cross beam and / or the longitudinal beam and improving the energy density of the battery monomer.

[0007] In some embodiments, the battery device comprises at least two first reinforcing structures, and the extension directions of the support plates of the at least two first reinforcing structures are perpendicular to each other.

[0008] In the above scheme, by arranging the at least two first reinforcing structures to be perpendicular to each other, the energy density of the battery monomer is further reduced, and the strength of the box body can be improved.

[0009] In some embodiments, the first battery monomers in the first reinforcing structure are arranged in sequence along the length direction of the first battery monomers.

[0010] In the above scheme, by arranging the first battery monomers of the first reinforcing structure in sequence along the length direction thereof, the spacing between the two support plates can be reduced, thereby reducing the occupied space of the first reinforcing structure and further improving the energy density of the battery monomer.

[0011] In some embodiments, adjacent first battery monomers in the first reinforcing structure are bonded to each other.

[0012] In the above scheme, by bonding the adjacent first battery monomers in the first reinforcing structure, the first battery monomers in the first reinforcing structure can be arranged more compactly, thereby further improving the energy density of the battery monomers and increasing the strength of the first reinforcing structure.

[0013] In some embodiments, the battery device further comprises a second reinforcing structure, the second reinforcing structure comprising the first battery monomers arranged at the outer periphery of the battery module and the binding members arranged at the outer periphery of the entire first battery monomers.

[0014] In the above scheme, the second reinforcing structure corresponds to the edge beam of the box body. By using the first battery monomers and the binding members to act as the edge beam of the box body, the use of the edge beam is eliminated, thereby further improving the energy density of the battery monomers. Moreover, the second reinforcing structure can thin the wall thickness of the box body, thereby achieving the effect of weight reduction.

[0015] In some embodiments, the second reinforcing structure comprises a plurality of reinforcing sub-structures, the plurality of reinforcing sub-structures enclosing a containing cavity for placing the battery module, and the first battery monomers of each reinforcing sub-structure are arranged in sequence along the length direction of the first battery monomers.

[0016] In the above scheme, by arranging the first battery monomers of each reinforcing sub-structure of the second reinforcing structure in sequence along the length direction thereof, the thickness of the second reinforcing structure can be reduced, thereby reducing the occupied space of the second reinforcing structure and further improving the energy density of the battery monomers.

[0017] In some embodiments, the adjacent first battery monomers in the reinforcing sub-structure are bonded to each other.

[0018] In the above scheme, by bonding the adjacent first battery monomers in the reinforcing sub-structure, the first battery monomers in the reinforcing sub-structure can be arranged more compactly, thereby further improving the energy density of the battery monomers and increasing the strength of the second reinforcing structure.

[0019] In some embodiments, the battery module further comprises the first battery monomers arranged in the box body, and the expansion coefficient of the second battery monomers is α B , α B satisfies: wherein L2 is the final thickness of the second battery monomers, L1 is the initial thickness of the second battery monomers, T2 is the final temperature of the second battery monomers, and T1 is the initial temperature of the first battery monomers.

[0020] In the above scheme, by using the first battery monomers and the second battery monomers with different expansion coefficients in the battery module, the expansion force can be absorbed and relieved, the design of the buffer pad is eliminated, and the energy density of the battery device is further improved.

[0021] In some embodiments, the compressible amount of the first battery cell is H A If L2 x a B ≥ H A / 2, the first battery cell and the second battery cell in the battery module are arranged alternately.

[0022] In the above scheme, when the expansion amount of the second battery cell is large, the first battery cell and the second battery cell are arranged alternately, so that the expansion of each second battery cell can be fully absorbed by the first battery cell, thereby improving the reliability of the battery module.

[0023] In some embodiments, the compressible amount of the first battery cell is H A If L2 x a B < H A / 2, two second battery cells are arranged between two first battery cells.

[0024] In the above scheme, when the expansion amount of the second battery cell is small, two second battery cells are arranged between the first battery cells, thereby providing more selection of arrangement.

[0025] In a second aspect, the embodiments of the present application further provide a power consumption device, which comprises the battery device of any of the above embodiments, and the battery device is used to provide electric energy.

[0026] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clear, the 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 will specifically describe the embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0028] Figure 1 Structure diagram of a vehicle of some embodiments of the present application;

[0029] Figure 2 Exploded view of a battery device of some embodiments of the present application;

[0030] Figure 3 Structure diagram of a battery module of some embodiments of the present application;

[0031] Figure 4A schematic diagram of a partial structure of a battery device according to some embodiments of the present application;

[0032] Figure 5 A schematic diagram of a partial structure of a battery device according to some embodiments of the present application;

[0033] Figure 6 A schematic diagram of a partial structure of a battery device according to some embodiments of the present application;

[0034] Figure 7 A schematic diagram of a partial structure of a battery device according to some embodiments of the present application;

[0035] Figure 8 A schematic diagram of a partial structure of a battery device according to some embodiments of the present application.

[0036] Explanation of reference signs:

[0037] 1000, vehicle; 100, battery device; 200, controller; 300, motor; 10, upper cover; 30, lower cover; 400, battery module; 20, battery cell; 21, end cover; 22, shell; 23, electrode assembly; 26, electrode terminal; 50, box body; 60, first reinforcing structure; 61, first battery cell; 62, support plate; 70, second reinforcing structure; 71, second battery cell; 72, binding member; 73, reinforcing substructure; 74, accommodating cavity. DETAILED DESCRIPTION

[0038] The embodiments of the present application will be further described in detail with reference to the drawings and examples. The detailed description and drawings of the following examples are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, i.e., the present application is not limited to the described examples.

[0039] In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer" and the like are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third", etc. are only for the purpose of description and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error.

[0040] Reference to an "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that that the embodiments described in this application can be combined with each other in their various permutations and combinations.

[0041] The positional words appearing in the following description are the directions shown in the drawings, and are not intended to limit the specific structure of the application. It should be noted in the description of the application that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0042] In this application, the battery cell can include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium-sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell, or a magnesium ion battery cell, etc. The embodiments of the present application are not limited thereto. The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc. The embodiments of the present application are also not limited thereto. The battery cell is generally divided into three types according to the packaging method: cylindrical battery cell, square battery cell, and soft package battery cell, and the embodiments of the present application are also not limited thereto.

[0043] The battery device mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, parallel, or mixed connection through a busbar component.

[0044] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0045] In some embodiments, the battery device can be a battery pack, which includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0046] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0047] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells in the box body.

[0048] The embodiments of the present application provide a power consumption device using a battery as a power supply, which can be but is not limited to a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric car, an electric vehicle, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0049] In order to meet the rigidity requirement of the battery device, a cross beam and a longitudinal beam are generally arranged in the box body to improve the rigidity of the battery device. However, the cross beam and the longitudinal beam occupy the internal space of the battery device and reduce the energy density of the battery device.

[0050] In order to solve the above technical problems, the embodiments of the present application provide a battery device, which comprises a box body, a battery module and a first reinforcing structure. The battery module comprises a second battery monomer arranged in the box body. The first reinforcing structure comprises two support plates and a plurality of first battery monomers clamped between the two support plates. The two ends of the support plate are connected with the box body. The expansion coefficient of the first battery monomer is smaller than that of the second battery monomer.

[0051] In the above scheme, the first battery monomer with a lower expansion coefficient is combined with the support plate as a reinforcing structure to serve as a cross beam and / or a longitudinal beam of the box body, thereby eliminating the cross beam and / or the longitudinal beam and improving the energy density of the battery monomer.

[0052] The following embodiments take a power consumption device of an embodiment of the present application as a vehicle 1000 for example for convenient description.

[0053] Please refer to Figure 1 , Figure 1 The vehicle structure schematic diagram provided by some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, which can be a pure electric vehicle, a hybrid electric vehicle or a range extended vehicle, 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 the operating power supply of the vehicle 1000. The vehicle 1000 can further comprise 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 working power demand of the vehicle 1000 during starting, navigation and driving.

[0054] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing the fuel or natural gas to provide driving power for the vehicle 1000.

[0055] Please refer to Figure 2 , Figure 2 The exploded view of the device provided in some embodiments of the present application is shown. The battery device 100 includes a battery box and a battery cell 20. In some embodiments, the battery box can include an upper cover 10 and a lower cover 30, the upper cover 10 and the lower cover 30 are covered with each other, and the upper cover 10 and the lower cover 30 together define a receiving cavity for accommodating the battery cell 20. The lower cover 30 can be a hollow structure with one end open, and the upper cover 10 can be a plate structure, the upper cover 10 is covered on the open side of the lower cover 30, so that the upper cover 10 and the lower cover 30 together define the receiving cavity; the upper cover 10 and the lower cover 30 can also be hollow structures with one side open, and the open side of the upper cover 10 is covered on the open side of the lower cover 30. Of course, the battery box formed by the upper cover 10 and the lower cover 30 can have various shapes, such as a cylinder, a cuboid, etc.

[0056] Figure 3 The structural schematic diagram of the battery module in some embodiments of the present application is shown. In the battery device 100, the battery cell 20 can be multiple, and the multiple battery cells 20 can be connected in series, in parallel or in a mixed manner. The mixed connection means that there are both series connection and parallel connection among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel or in a mixed manner, and then the whole of the multiple battery cells 20 is accommodated in the box; of course, the battery device 100 can also be in the form that the multiple battery cells 20 are first connected in series, in parallel or in a mixed manner to form a battery module 400, and then the multiple battery modules 400 are connected in series, in parallel or in a mixed manner to form a whole, which is accommodated in the box. The battery device 100 can also include other structures, for example, the battery device 100 can also include a current collecting component for realizing the electrical connection between the multiple battery cells 20.

[0057] Each battery cell 20 can be a secondary battery cell or a primary battery cell; it can also be a lithium-sulfur battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, but is not limited thereto. The battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc.

[0058] Please refer to Figure 4 , Figure 4 The exploded structural schematic diagram of the battery cell provided in some embodiments of the present application is shown. The battery cell 20 refers to the smallest unit that constitutes a battery. The battery cell 20 includes an end cover 21, a shell 22, an electrode assembly 23 and other functional components.

[0059] The end cover 21 refers to a component that covers the opening of the case 22 to isolate the internal environment of the battery monomer 20 from the external environment. Without limitation, the shape of the end cover 21 can be adapted to the shape of the case 22 to fit the case 22. Alternatively, the end cover 21 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 21 is less likely to deform when subjected to extrusion collision, enabling the battery monomer 20 to have higher structural strength and improved safety performance. The end cover 21 can be provided with functional components such as the electrode terminal 26. The electrode terminal 26 can be used to electrically connect with the electrode assembly 23 for outputting or inputting the electrical energy of the battery monomer 20. In some embodiments, the end cover 21 can also be provided with a pressure relief mechanism for relieving the internal pressure of the battery monomer 20 when the internal pressure or temperature reaches a threshold value. The material of the end cover 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the present application does not make special limitations on this. In some embodiments, an insulating member can also be provided on the inner side of the end cover 21, which can be used to isolate the electrical connection components in the case 22 from the end cover 21 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0060] Figure 5 is a partial structural schematic diagram of a battery device according to some embodiments of the present application.

[0061] As shown in Figure 5 , in a first aspect, the embodiments of the present application provide a battery device 100, which comprises a box body 50, a battery module 400 and a first reinforcing structure 60; the battery module 400 comprises a second battery monomer 71 arranged in the box body 50; the first reinforcing structure 60 comprises a plurality of first battery monomers 61 clamped between two support plates 62, and the two ends of the support plate 62 are connected with the box body 50; the expansion coefficient of the first battery monomer 61 is less than the expansion coefficient of the second battery monomer 71.

[0062] The battery module 400 can comprise the first battery monomer 61 and the second battery monomer 71, and the first battery monomer 61 is used in cooperation with the second battery monomer 71. Alternatively, the battery module 400 only comprises the second battery monomer 71.

[0063] The support plates 62 can be steel plates, or other metal plates with high rigidity, plastic plates, etc. The first reinforcing structure 60 can replace the longitudinal beams or the transverse beams of the box body 50, or two first reinforcing structures 60 are provided, one of which replaces the longitudinal beams of the box body 50, and the other of which replaces the transverse beams of the box body 50. The first battery cells 61 clamped between the two support plates 62 are connected in series and / or parallel with the second battery cells 71 in other areas of the box body 50, that is, the first battery cells 61 in the first reinforcing structure 60 are connected in series or parallel with the second battery cells 71 of the battery module 400. Alternatively, the battery module 400 is also provided with the first battery cells 61, and then the first battery cells 61 in the first reinforcing structure 60 can be connected in series or parallel with the first battery cells 61 and the second battery cells 71 of the battery module 400, respectively.

[0064] The expansion coefficient, also known as the thermal expansion coefficient, refers to the relative change in volume or length of an object when the temperature increases by 1℃. It reflects the characteristics of the expansion or contraction of a material with temperature change, and is an important thermophysical property of the material. It should be noted that the expansion coefficient of the embodiments of the present application refers to the volume expansion coefficient, which is used to measure the degree of change in the volume of the battery cell 20 when the temperature changes.

[0065] During the charging and discharging process of the battery, complex chemical reactions occur inside the battery, which generate heat and cause the temperature of the battery cell 20 to rise. For battery cells 20 with different expansion coefficients, the influence of temperature rise is significantly different. The second battery cell 71 with a higher expansion coefficient changes in volume more obviously when the temperature rises, which may change the contact state between the battery cells 20 and affect the stability and performance of the battery module 400. The first battery cell 61 with a low expansion coefficient changes in size relatively less under the same temperature change, and can maintain a more stable physical form.

[0066] The low expansion coefficient of the first battery cell 61, in combination with the support plate 62, acts as the first reinforcing structure 60. Since the first battery cell 61 is stable in size when the temperature changes, it still has a large rigidity when bearing external stress and maintaining the battery device 100. When the battery device 100 is subjected to external forces such as vibration and impact, the first battery cell 61 with a low expansion coefficient will not change in volume significantly due to temperature fluctuations, thereby ensuring the stability of the first reinforcing structure 60 to some extent, effectively replacing the traditional transverse beams and longitudinal beams, and providing reliable support for the battery device 100.

[0067] In the above scheme, the first battery cell 61 with a lower expansion coefficient is combined with the support plate 62 to act as a reinforcing structure, which replaces the transverse beams and / or longitudinal beams of the box body 50, thereby improving the energy density of the battery cell 20.

[0068] In some embodiments, the battery device 100 comprises at least two first reinforcing structures 60, the extension directions of the support plates 62 of the at least two first reinforcing structures 60 are perpendicular to each other.

[0069] For example, the support plate 62 of one of the first reinforcing structures 60 extends along the length direction of the box 50, and the support plate 62 of the other first reinforcing structure 60 extends along the width direction of the box 50. One of the first reinforcing structures 60 acts as a cross beam of the box 50, and the other first reinforcing structure 60 acts as a longitudinal beam of the box 50.

[0070] In the above scheme, by arranging the at least two first reinforcing structures 60 to be perpendicular to each other, the energy density of the battery monomer 20 is further reduced, and the strength of the box 50 can be improved.

[0071] In some embodiments, the first battery monomers 61 in the first reinforcing structure 60 are arranged in sequence along the length direction of the first battery monomer 61.

[0072] The first battery monomers 61 can be arranged in close contact with each other. The first battery monomers 61 can be in the shape of a cuboid. The first battery monomers 61 in the first reinforcing structure 60 are arranged along the length direction of the first battery monomer 61, and then the two support plates 62 of the first reinforcing structure 60 are arranged in the width direction of the first battery monomer 61. The support plate 62 is in contact with the side surface of each first battery monomer 61 with the largest area, and the thickness of the first reinforcing structure 60 is the sum of the thicknesses of the two support plates 62 and the thickness of the first battery monomer 61.

[0073] In the above scheme, by arranging the first battery monomers 61 in the first reinforcing structure 60 in sequence along the length direction of the first battery monomer 61, the spacing between the two support plates 62 can be reduced, thereby reducing the occupied space of the first reinforcing structure 60 and further improving the energy density of the battery monomer 20.

[0074] In some embodiments, adjacent first battery monomers 61 in the first reinforcing structure 60 are bonded to each other.

[0075] The adhesive can be coated on the side surface of the first battery monomer 61 along the length direction of the first battery monomer 61. After the adhesive is cured, a stable connection between the battery monomers 20 can be formed. Compared with mechanical connection methods such as buckling and bolting, bonding does not require additional connecting components, thereby saving space. Through close bonding, the first battery monomers 61 can be arranged more closely together, reducing the gap between the first battery monomers 61, and making the volume of the first reinforcing structure 60 more compact.

[0076] In the above scheme, by bonding the adjacent first battery cells 61 in the first reinforcing structure 60 to each other, the first battery cells 61 in the first reinforcing structure 60 can be arranged more compactly, thereby further improving the energy density of the battery cells 20 and increasing the strength of the first reinforcing structure 60.

[0077] Figure 6 is a schematic diagram of a partial structure of a battery device according to another embodiment of the present application.

[0078] As shown in Figure 6 In some embodiments, the battery device 100 further includes a second reinforcing structure 70, which includes the first battery cells 61 arranged at the outer periphery of the battery module 400 and the binding member 72 arranged at the outer periphery of the entire first battery cells 61.

[0079] The binding member 72 can be a structure such as a cable tie or a rubber band that can be tied, or can also be a binding cloth or a binding plate, etc. First, a ring of first battery cells 61 is arranged at the outer periphery of the entire battery module 400, and then the binding member 72 is used to tie and fix. The second reinforcing structure 70 is located on the inner side of the box 50 and is arranged in a ring around the inner side wall of the box 50, and can be in contact with the inner side wall of the box 50.

[0080] It can be understood that the second reinforcing structure 70 bypasses the position at which the first reinforcing structure 60 is connected to the box 50, and the binding member 72 can be just above the first reinforcing structure 60 when it is tied around the first battery cells 61, so as to tie the first battery cells 61 of the second reinforcing structure 70 around the first reinforcing structure 60.

[0081] The second reinforcing structure 70 is located on the inner side of the box 50 and is arranged in a ring around the circumference of the box 50, which is equivalent to a border beam of the box 50, so there is no need to additionally arrange a border beam.

[0082] The first battery cells 61 with a smaller expansion coefficient are used in cooperation with the binding member 72 to act as a border beam. The first battery cells 61 with a small expansion coefficient change little in size when the temperature changes due to charging and discharging of the battery. Cooperating with the binding member 72 to act as a border beam, it can maintain a stable form under different working conditions and provide reliable edge support for the battery device 100. When the battery device 100 is subjected to external vibration or impact, it can effectively disperse and withstand external force by virtue of its stable physical properties, avoid damage to the internal structure of the battery module 400 due to uneven stress, and enhance the structural stability of the entire battery device 100, thereby prolonging the service life of the battery.

[0083] In the above scheme, the second reinforcing structure 70 corresponds to the edge beam of the box body 50. By using the first battery monomer 61 to cooperate with the binding member 72 to serve as the edge beam of the box body 50, the use of the edge beam is omitted, and the energy density of the battery monomer 20 is further improved. Moreover, the second reinforcing structure 70 can thin the wall thickness of the box body 50, achieving the effect of weight reduction.

[0084] In some embodiments, the second reinforcing structure 70 includes a plurality of reinforcing sub-structures 73, and the plurality of reinforcing sub-structures 73 enclose a containing cavity 74 for placing the battery module 400. The first battery monomer 61 of each reinforcing sub-structure 73 is arranged in sequence along the length direction of the first battery monomer 61.

[0085] For example, the box body 50 is rectangular or square, and each reinforcing sub-structure 73 extends along the side length of the box body 50 and is arranged on the inner side of each side wall of the box body 50.

[0086] The plurality of first battery monomers 61 of each reinforcing sub-structure 73 are arranged in close proximity to each other. The first battery monomer 61 can be in the shape of a cuboid, and the first battery monomers 61 of the second reinforcing structure 70 are arranged along the length direction thereof, so that the side surface with the maximum area of the first battery monomers 61 of the second reinforcing structure 70 is in contact with the box body 50.

[0087] In the above scheme, by arranging the first battery monomers 61 of each reinforcing sub-structure 73 of the second reinforcing structure 70 in sequence along the length direction thereof, the thickness of the second reinforcing structure 70 can be reduced, thereby reducing the occupied space of the second reinforcing structure 70 and further improving the energy density of the battery monomer 20.

[0088] In some embodiments, the adjacent first battery monomers 61 in the reinforcing sub-structure 73 are bonded to each other.

[0089] The adhesive can be coated on the side surface of the first battery monomer 61 along the length direction thereof, and after the adhesive is cured, a stable connection between the battery monomers 20 can be formed. Compared with mechanical connection modes such as buckling and bolting, bonding does not require additional connecting components, thereby saving space. Through close bonding, the first battery monomers 61 can be more closely arranged together, reducing the gap between the first battery monomers 61, so that the volume of the second reinforcing structure 70 is more compact.

[0090] In the above scheme, by bonding the adjacent first battery monomers 61 in the reinforcing sub-structure 73 to each other, the first battery monomers 61 in the reinforcing sub-structure 73 can be arranged more compactly, thereby further improving the energy density of the battery monomer 20 and increasing the strength of the second reinforcing structure 70.

[0091] In some embodiments, the battery module 400 further comprises a first battery cell 61 and a second battery cell 71 disposed in the case 50, the second battery cell 71 has an expansion coefficient of a B , a B satisfies: wherein L2 is the final thickness of the second battery cell 71, L1 is the initial thickness of the second battery cell 71, T2 is the final temperature of the second battery cell 71, and T1 is the initial temperature of the first battery cell 61.

[0092] During the operation of the battery module 400, the charging and discharging will cause the temperature of the battery to change. Due to the different expansion coefficients of the first battery cell 61 and the second battery cell 71, there is a difference in the degree of expansion or contraction when the temperature changes. This difference causes interaction between the two battery cells 20. During the expansion process, the expansion force generated by the second battery cell 71 with a large expansion coefficient is partially offset by the first battery cell 61 with a small expansion coefficient.

[0093] In order to cope with the expansion of the battery cell 20, the battery module 400 usually sets a buffer pad. However, the buffer pad occupies the internal space of the battery device 100, and the buffer pad itself does not participate in the storage of electrical energy, which reduces the energy density. By matching the first battery cell 61 and the second battery cell 71 with different expansion coefficients, and using the interaction between them to absorb the expansion force, the buffer pad can be omitted. This not only reduces the number of parts and simplifies the structure of the battery module 400, but also releases more space for arranging the battery cell 20, thereby effectively improving the energy density of the battery device 100 and improving the overall performance of the battery device 100.

[0094] In the above scheme, by matching the first battery cell 61 and the second battery cell 71 with different expansion coefficients in the battery module 400, the expansion force can be absorbed and relieved, the design of the buffer pad can be omitted, and the energy density of the battery device 100 can be further improved.

[0095] Figure 7 is a structural schematic diagram of a battery module of another embodiment of the present application.

[0096] As Figure 7 shown, in some embodiments, the compressible amount of the first battery cell 61 is HA, and if L2 x aB≥HA / 2, the first battery cell 61 and the second battery cell 71 in the battery module 400 are arranged alternately.

[0097] The compressible amount HA of the first battery cell 61 is a key indicator of its ability to withstand a certain degree of extrusion without affecting performance. When L2 x aB≥HA / 2, it means that the second battery cell 71 has a large expansion amount under temperature changes, which exceeds half of the compressible amount of the first battery cell 61. In this case, the first battery cell 61 and the second battery cell 71 are arranged alternately to form a close interaction structure. When each second battery cell 71 expands, the two adjacent first battery cells 61 on both sides can absorb the expansion force of the second battery cell 71 from two directions by using their compressibility, ensuring uniform stress distribution inside the battery module 400 and avoiding damage or performance degradation of the battery due to excessive local stress.

[0098] In the above scheme, when the expansion amount of the second battery cell 71 is large, the first battery cell 61 and the second battery cell 71 are arranged alternately, so that the expansion of each second battery cell 71 can be fully absorbed by the first battery cell 61, improving the reliability of the battery module 400.

[0099] Figure 8 is a structural schematic diagram of a battery module according to some embodiments of the present application.

[0100] As shown in Figure 8 , in some embodiments, the compressible amount of the first battery cell 61 is HA, and if L2 x aB<HA / 2, two second battery cells 71 are arranged between the two first battery cells 61.

[0101] When L2 x aB<HA / 2, it indicates that the expansion amount of the second battery cell 71 under temperature changes is relatively small, and the compressible amount of the first battery cell 61 is relatively sufficient. Arranging two second battery cells 71 between two first battery cells 61 can not only make full use of the compressibility of the first battery cell 61 to buffer the expansion of the second battery cell 71, but also increase the number of second battery cells 71 in a limited space. Because the expansion amount of the second battery cell 71 is small, the expansion force generated by the two second battery cells 71 is within the compressible range of the first battery cell 61, and the first battery cell 61 can effectively absorb the expansion force to maintain the stability of the structure of the battery module 400.

[0102] In the above scheme, when the expansion amount of the second battery cell 71 is small, the arrangement of two second battery cells 71 between the first battery cells 61 can be used to provide more options for arrangement.

[0103] In a second aspect, the embodiments of the present application also provide an electric device, which comprises the battery device 100 according to any of the above embodiments, and the battery device 100 is used to provide electric energy.

[0104] According to some embodiments of the present application, the present application provides a battery device 100, the battery device 100 comprising a box 50, a battery module 400 and a first reinforcing structure 60; the battery module 400 comprising a second battery cell 71 arranged in the box 50; the first reinforcing structure 60 comprising two support plates 62 and a plurality of first battery cells 61 clamped between the two support plates 62, both ends of the support plate 62 being connected with the box 50; the expansion coefficient of the first battery cell 61 being less than the expansion coefficient of the second battery cell 71. The battery device 100 further comprises a second reinforcing structure 70, the second reinforcing structure 70 comprising the first battery cell 61 arranged at the outer periphery of the battery module 400 and the binding member 72 arranged at the outer periphery of the entire first battery cell 61.

[0105] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand: it 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 present application, and they should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, The battery device comprises: a box; a battery module comprising second battery cells arranged in the box; a first reinforcing structure comprising two support plates and a plurality of first battery cells sandwiched between the two support plates, the two ends of the support plates being connected to the box, and the expansion coefficient of the first battery cells being less than that of the second battery cells.

2. The battery device of claim 1, wherein The battery device comprises at least two first reinforcing structures, and the extension directions of the support plates of the at least two first reinforcing structures are perpendicular to each other.

3. The battery device of claim 1, wherein The first battery cells in the first reinforcing structure are arranged in sequence along the length direction of the first battery cells.

4. The battery device of claim 3, wherein The adjacent first battery cells in the first reinforcing structure are bonded to each other.

5. The battery device of claim 1, wherein The battery device further comprises a second reinforcing structure, the second reinforcing structure comprising the first battery cells arranged at the outer periphery of the battery module and a binding member arranged at the outer periphery of the first battery cells.

6. The battery device of claim 5, wherein The second reinforcing structure comprises a plurality of reinforcing sub-structures, and the reinforcing sub-structures enclose a containing cavity for placing the battery module, and the first battery cells of each reinforcing sub-structure are arranged in sequence along the length direction of the first battery cells.

7. The battery device of claim 6, wherein The adjacent first battery cells in the reinforcing sub-structure are bonded to each other.

8. The battery device of claim 1, wherein The battery module further includes the first battery cell disposed in the housing, and the coefficient of expansion of the second battery cell is α. B The α B Satisfy: α B = Wherein, L2 is the final thickness of the second battery cell, L1 is the initial thickness of the second battery cell, T2 is the final temperature of the second battery cell, and T1 is the initial temperature of the first battery cell.

9. The battery device of claim 8, wherein, The compressible amount of the first battery cell is H A , if L2 x a B ≥ H A / 2, the first battery cell and the second battery cell in the battery module are arranged alternately.

10. The battery device of claim 8, wherein, The compressible amount of the first battery cell is H A , if L2 x a B < H A / 2, two second battery cells are arranged between two first battery cells.

11. An electrical device, characterized by The battery device according to any one of claims 1-10 is used for providing electric energy.

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