Battery device and electric device

Abstract

The embodiment of the utility model provides a battery device and a power utilization device, and relates to the technical field of batteries. The battery device comprises a first box body, a battery cell assembly and a heat management part. Wherein the battery monomer assembly is accommodated in the first box body, and the battery monomer assembly comprises a plurality of battery monomers. And at least partial area of the heat management component is accommodated in the first box body and is used for adjusting the temperature of the battery monomers. The first box body comprises a first part and a second part, the first part is connected with the heat management component, and the second part is connected to the periphery of the first part. The first portion is thicker than the second portion. According to the battery device provided by the embodiment of the invention, by increasing the thickness of the connecting area of the first box body and the heat management component, the connecting strength of the first box body and the heat management component can be higher.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. In this case, electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In the development of battery technology, battery reliability is an issue that cannot be ignored. If the reliability of the battery cannot be guaranteed, the battery cannot be used. Therefore, how to enhance the reliability of the battery is a technical problem that needs to be solved urgently in battery technology. Utility Model Content

[0004] The present application provides a battery device and an electrical device, which can improve the reliability of the battery.

[0005] This application is achieved through the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a battery device, comprising a first housing, a battery cell assembly, and a thermal management component. The battery cell assembly is contained in the first housing, and the battery cell assembly may include a plurality of battery cells. At least a portion of the thermal management component is contained in the first housing, and is used to adjust the temperature of the battery cell. The first housing comprises a first portion and a second portion, the first portion being connected to the thermal management component, and the second portion being connected to the periphery of the first portion. The thickness of the first portion is greater than the thickness of the second portion.

[0007] In the above embodiment, the thickness of the first part is greater than the thickness of the second part. When the first part is connected to the thermal management component, on the one hand, the connection strength between the first part and the thermal management component can be improved. Exemplarily, when the first part is connected to the thermal management component by a fastener, the thickness of the first part increases, which can improve the connection strength between the first box and the thermal management component. On the other hand, by partially thickening the first box instead of thickening the entire box, the impact on the lightweight of the first box can be reduced, and the amount of material used can also be reduced.

[0008] In some embodiments of the present application, the first part includes a first sub-part and a second sub-part, and the first sub-part and the second sub-part are stacked along a first direction. The second part is connected to the outer periphery of the first sub-part, and the second sub-part is connected to the inner periphery of the first sub-part. The first direction is the thickness direction of the thermal management component. Through the arrangement of the above embodiments, the first sub-part and the second sub-part form a stacked structure, so that the first part formed by the first sub-part and the second sub-part has a thickness greater than that of the second part.

[0009] In some embodiments of the present application, the first sub-section, the second sub-section and the second section are integrally formed. With this arrangement, during the production of the first box, the first sub-section, the second sub-section and the second section can be formed in one process, and the production efficiency of the first box can be effectively improved.

[0010] In some embodiments of the present application, the first sub-section, the second sub-section and the second section have the same thickness. With this arrangement, the first sub-section, the second sub-section and the second section can be selected from the same batch or the same type of materials when selecting materials, and multiple batches of production are not required. After the material selection, the second sub-section is bent along the connection area with the first sub-section. After the bending, the second sub-section is attached to the first sub-section to obtain a first section having a thickness greater than that of the second section.

[0011] In some embodiments of the present application, the first sub-section and the second sub-section are welded. In the above embodiments, the contact area of ​​the stacked structure formed by the first sub-section and the second sub-section is connected by welding, so that the first section formed by the first sub-section and the second sub-section can maintain the consistency of thickness in the first direction. On the other hand, in some examples, after the second sub-section is bent to form a stacked structure with the first sub-section, rebound may occur, resulting in instability of the stacked structure of the two. The first sub-section and the second sub-section are connected by welding, which can effectively reduce the occurrence of this situation, thereby improving the connection stability of the first sub-section and the second sub-section.

[0012] In some embodiments of the present application, along the first direction, the second sub-section is disposed between the first sub-section and the thermal management component. In some examples, the thermal management component contacts the battery cell assembly, and both the thermal management component and the battery cell assembly are located inside the first box. When the second sub-section is disposed between the first sub-section and the thermal management component, it can be considered that the second sub-section is also located in the inner area of ​​the first box. When the second sub-section is located in the inner area of ​​the first box, it is less affected by the outside world.

[0013] In some embodiments of the present application, the thermal management component includes a main body and an edge portion, wherein the main body is formed with a flow channel for circulating a heat exchange medium, and the edge portion is arranged at the periphery of the main body. The edge portion is connected to the first portion. The thickness of the first portion is defined as d 1 The thickness of the edge is defined as d 2 , where d 1 ≥d 2 In some application scenarios, when the edge portion is riveted to the first portion, setting the thickness of the first portion to be greater than or equal to the thickness of the edge portion can increase the connection strength between the edge portion and the first portion.

[0014] In some embodiments of the present application, d 1 ≤3*d 2. As the thickness of the first part increases, the connection strength between the first part and the edge part is higher. In actual situations, as the thickness of the first part increases, on the one hand, the weight of the finally formed first box body will also increase accordingly. In some application scenarios, the increase in the weight of the first box body will not only affect the lightweight of the first box body itself, but also require higher strength requirements for the equipment carrying the battery device, resulting in a further increase in the mass of the final electrical device, and then a decrease in the economy of the final electrical device. On the other hand, as the thickness of the first part increases, the use of materials will increase accordingly, and the economy will further decrease. Based on this situation, in this embodiment, the thickness of the first part is set to no more than three times the thickness of the edge part, which can take into account the economy while improving the connection strength between the first part and the edge part.

[0015] In some embodiments of the present application, the first portion and the thermal management component are connected by self-piercing rivets. The connection strength of self-piercing rivets is relatively higher and the fatigue resistance is also better.

[0016] In some embodiments of the present application, the first part is connected to the thermal management component by a rivet, and one end of the rivet away from the thermal management component along the first direction is located in the first part, and the first direction is the thickness direction of the thermal management component. In this embodiment, the thickness of the first part can be set so that when the first part and the thermal management component are self-piercing riveted, the tip of the connecting rivet is located in the first part, while improving the connection strength, the connecting rivet is difficult to form a hole in the first direction at the end of the first part away from the thermal management component, thereby reducing the reduction of the airtightness of the first box due to the appearance of the hole during the connection process of the first part with the thermal management component.

[0017] In some embodiments of the present application, the thermal management component carries the battery cell assembly, and along the first direction, the first portion is located on the side of the thermal management component away from the battery cell assembly, and the first direction is the thickness direction of the thermal management component. Through this arrangement, the first portion carries the thermal management component, so that the thermal management component can maintain good contact with the battery cell, thereby enabling the thermal management component to always achieve good heat dissipation performance.

[0018] In some embodiments of the present application, the first box body is formed by stamping or roll forming.

[0019] In a second aspect, an embodiment of the present application provides an electrical device, comprising a battery device according to any one of the above embodiments.

[0020] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0023] Figure 2 A schematic diagram of the exploded structure of a battery device according to some embodiments of the present application;

[0024] Figure 3 This is a schematic diagram of the exploded structure of the first box and the thermal management component of some embodiments of the present application;

[0025] Figure 4 A schematic diagram of a partial structure of a battery device according to some embodiments of the present application;

[0026] Figure 5 for Figure 4 A local enlarged view at point A;

[0027] icon:

[0028] 1000, vehicle; 100, battery device; 200, controller; 300, motor; 10, housing; 11, first housing; 12, second housing; 20, battery cell; 101, first part; 1011, first sub-part; 1012, second sub-part; 102, second part; 30, thermal management component; 301, main body; 302, edge; 3011, flow channel; 40, rivet. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0031] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0032] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0034] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, in parallel or in hybrid connection through a busbar.

[0035] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0036] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0037] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0038] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0039] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0040] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0041] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the bottom plate of the vehicle, or the frame of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0042] In some embodiments, the battery device refers to an energy storage device, which includes a box body, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0043] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0044] The battery cells may be, but are not limited to, lithium ion batteries, sodium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel hydrogen batteries, nickel cadmium batteries, lead storage batteries, etc.

[0045] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to reduce the short circuit between the positive and negative electrodes, while allowing the active ions to pass through.

[0046] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0047] In some embodiments, the electrode assembly is a laminate structure.

[0048] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0049] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap closes the opening to form a closed space for accommodating substances such as the electrode assembly and the electrolyte. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0050] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab of the electrode assembly. The electrode terminal may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through an adapter. The electrode terminal may be disposed on the end cap, or may be disposed on the housing.

[0051] In some embodiments, an explosion-proof valve is provided on the housing, and the explosion-proof valve is used to release the internal pressure of the battery cell.

[0052] In some embodiments, the housing may be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, the housing may protect the electrode assembly and reduce leakage of electrolyte. When the housing is a non-sealed structure, the housing may protect the electrode assembly, and a sealing bag may be included between the housing and the electrode assembly, the sealing bag being used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag may be a bag-shaped insulating member or an aluminum-plastic film.

[0053] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal prismatic battery, such as a hexagonal prismatic battery, etc. There is no particular limitation in the embodiments of the present application.

[0054] With the continuous advancement of the overall battery technology, the existing battery case can achieve higher strength with a smaller thickness, thereby meeting the use requirements of different scenarios. From the perspective of production and manufacturing technology, when the thickness of the wall connecting the case to other components is less than a certain degree, the connection strength between the case and other components will be poor. For example, when the connection method between the case and the thermal management component is riveted, the connection strength between the case and the thermal management component will be poor because the thickness of the wall of the case is thin. At present, the case is mainly manufactured by one-piece molding. If the overall thickness of the case is increased in order to improve the connection strength between the case and the thermal management component, on the one hand, the lightweight performance of the case will be reduced; on the other hand, it will also increase the amount of material used, thereby increasing the manufacturing cost of the case.

[0055] The thermal management component is used to contain a fluid to adjust the temperature of multiple battery cells. The fluid here can be a liquid or a gas, and adjusting the temperature means heating or cooling multiple battery cells. In the case of cooling or lowering the temperature of the battery cells, the thermal management component is used to contain a cooling fluid to lower the temperature of multiple battery cells. At this time, the thermal management component can also be called a cooling component, a cooling system or a cooling plate, etc., and the fluid contained therein can also be called a cooling medium or a cooling fluid, more specifically, a coolant or a cooling gas. In addition, the thermal management component can also be used for heating to increase the temperature of multiple battery cells, which is not limited in the embodiments of the present application. Optionally, the fluid can be circulating to achieve a better temperature regulation effect. Optionally, the fluid can be water, a mixture of water and ethylene glycol, or air, etc.

[0056] Some embodiments of the present application provide a battery device and an electrical device. By increasing the thickness of the connection area between the box and the thermal management component, on the one hand, the connection strength between the first part and the thermal management component is improved; on the other hand, by partially thickening the box instead of thickening the entire box, the impact on the lightweight of the box can be reduced, and the amount of material used can also be reduced.

[0057] The battery device disclosed in the embodiment of the present application can be used in, but not limited to, electrical equipment such as vehicles, ships or aircraft. The battery device disclosed in the present application can be used to form a power supply system of the electrical equipment.

[0058] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0059] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0060] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used for powering the vehicle 1000. For example, the battery device 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the startup, navigation and operation of the vehicle 1000.

[0061] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein the controller 200 is used to control the battery device 100 to supply power to the motor 300 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0062] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0063] Please refer to Figure 2 , Figure 2 A schematic diagram of the structural decomposition of a battery device 100 provided in some embodiments of the present application. The battery device 100 includes a box body 10 and a battery cell 20, and the battery cell 20 is contained in the box body 10. Among them, the box body 10 is used to provide a storage space for the battery cell 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, and the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define a storage space for accommodating the battery cell 20. The first box body 11 can be a hollow structure with one end open, and the second box body 12 can be a plate-like structure. The second box body 12 covers the open side of the first box body 11, so that the first box body 11 and the second box body 12 jointly define a storage space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0064] In the battery device 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery device 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery device 100 may also include other structures, for example, the battery device 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0065] In some embodiments of this application, please refer to Figures 3 to 5 , Figure 3 The schematic diagram of the exploded structure of the first box 11 and the thermal management component 30 provided in this embodiment is as follows: Figure 4 A schematic diagram of a partial structure of a battery device 100 provided in this embodiment, Figure 5 for Figure 4A partial enlarged view at A. Specifically, the present embodiment provides a battery device 100. The battery device 100 includes a first box body 11, a battery cell assembly and a thermal management component 30. Among them, the battery cell assembly may include a plurality of battery cells 20, and the plurality of battery cells 20 are all accommodated in the first box body 11. At least a portion of the thermal management component 30 is accommodated in the first box body 11, and the thermal management component 30 is used to adjust the temperature of the battery cell 20. The first box body 11 includes a first part 101 and a second part 102, and the first part 101 is connected to the thermal management component 30. The second part 102 is connected to the periphery of the first part 101. The thickness of the first part 101 is greater than the thickness of the second part 102.

[0066] The first part 101 and the second part 102 are partial areas or partial structures of the first box body 11 respectively. The first part 101 and the second part 102 are connected to each other. The periphery of the first part 101 refers to the edge area of ​​the first part 101 in directions other than the thickness direction.

[0067] In some examples, when the first box 11 and the thermal management component 30 have multiple connection areas, the first portion 101 may be multiple areas arranged at intervals, rather than a continuous area; in this example, the area between adjacent first portions 101 may also be regarded as the second portion 102. Of course, in this example, it can also be considered that the area of ​​the first portion 101 includes multiple connection areas arranged at intervals, and the area between adjacent connection areas.

[0068] In the above embodiment, the thickness of the first part 101 is greater than the thickness of the second part 102. When the first part 101 is connected to the thermal management component 30, on the one hand, the connection strength between the first part 101 and the thermal management component 30 can be improved. Exemplarily, when the first part 101 is connected to the thermal management component 30 by a fastener, the thickness of the first part 101 increases, which can improve the connection strength between the first part 101 and the thermal management component 30. On the other hand, by partially thickening the first box body 11 instead of thickening the entire box body 11, the impact on the lightweight of the first box body 11 can be reduced, and the amount of material used can also be reduced.

[0069] In some embodiments of the present application, the first portion 101 includes a first sub-portion 1011 and a second sub-portion 1012, wherein the first sub-portion 1011 and the second sub-portion 1012 are stacked along a first direction, and the first direction is the thickness direction of the thermal management component 30. The second portion 102 is connected to the outer periphery of the first sub-portion 1011, and the second sub-portion 1012 is connected to the inner periphery of the first sub-portion 1011, and the first sub-portion 1011, the second sub-portion 1012 and the second portion 102 form a whole. Through the arrangement of the above embodiments, the first sub-portion 1011 and the second sub-portion 1012 form a stacked structure, so that the first portion 101 formed by the first sub-portion 1011 and the second sub-portion 1012 has a thickness greater than that of the second portion 102.

[0070] In other embodiments of the present application, the first sub-section 1011 and the second sub-section 1012 are relatively independent components, and the second sub-section 1012 is connected to the first sub-section 1011 in the thickness direction to form a first section 101 of a stacked structure, so as to achieve the purpose of the first section 101 formed by the first sub-section 1011 and the second sub-section 1012 having a thickness greater than that of the second section 102.

[0071] In some other embodiments of the present application, during the molding process of the first box body 11, the first part 101 and the second part 102 can be molded separately. During the molding process of the first part 101, the thickness of the first part 101 is set to be larger than the thickness of the second part 102, and then the first part 101 and the second part 102 are connected to form a whole.

[0072] In some embodiments of the present application, the first sub-section 1011, the second sub-section 1012 and the second section 102 are integrally formed. With this arrangement, during the production process of the first box body 11, the first sub-section 1011, the second sub-section 1012 and the second section 102 can be formed in one process, and the production efficiency of the first box body 11 can be effectively improved.

[0073] In some embodiments of the present application, the first sub-section 1011, the second sub-section 1012 and the second section 102 have the same thickness. With this arrangement, the first sub-section 1011, the second sub-section 1012 and the second section 102 can select materials from the same batch or the same type when selecting materials, and do not need to produce in multiple batches. After selecting the materials, the second sub-section 1012 is bent along the connection area with the first sub-section 1011. After bending, the second sub-section 1012 is attached to the first sub-section 1011, so that the first section 101 having a thickness greater than that of the second section 102 is obtained.

[0074] In some examples, the first sub-section 1011, the second sub-section 1012 and the second section 102 are integrally formed, and the thickness of the three is the same after forming. Through this arrangement, the first sub-section 1011, the second sub-section 1012 and the second section 102 can be obtained through a one-time process, and there is no need to use multiple processes for manufacturing, the process flow is simpler and more economical. After the first sub-section 1011, the second sub-section 1012 and the second section 102 are integrally formed, the first sub-section 1011 and the second sub-section 1012 are bent to each other to form a stacked structure, and finally a first section 101 with a thickness greater than that of the second section 102 is obtained, thereby improving the connection strength between the first section 101 and the thermal management component 30.

[0075] In some embodiments of the present application, the first sub-section 1011 and the second sub-section 1012 are welded. In the above embodiments, the contact area of ​​the stacked structure formed by the first sub-section 1011 and the second sub-section 1012 is connected by welding, so that the first section 101 formed by the first sub-section 1011 and the second sub-section 1012 can maintain the consistency of thickness in the first direction. On the other hand, in some examples, after the second sub-section 1012 is bent to form a stacked structure with the first sub-section 1011, rebound may occur, resulting in instability of the stacked structure of the two. The first sub-section 1011 and the second sub-section 1012 are connected by welding, which can effectively reduce the occurrence of this situation, thereby improving the connection stability of the first sub-section 1011 and the second sub-section 1012.

[0076] In some examples, laser penetration welding may be used to achieve welding of the first sub-portion 1011 and the second sub-portion 1012 .

[0077] In some embodiments of the present application, along the first direction, the second sub-section 1012 is disposed between the first sub-section 1011 and the thermal management component 30. In some examples, the thermal management component 30 contacts the battery cell assembly, and both the thermal management component 30 and the battery cell assembly are located inside the first box 11. When the second sub-section 1012 is disposed between the first sub-section 1011 and the thermal management component 30, it can be considered that the second sub-section 1012 is also located in the inner area of ​​the first box 11. When the second sub-section 1012 is located in the inner area of ​​the first box 11, it is less affected by the outside world.

[0078] In some other embodiments of the present application, along the first direction, the second sub-portion 1012 is arranged on a side of the first sub-portion 1011 away from the heat management component 30. Through this arrangement, the purpose of locally thickening the first portion 101 of the first box body 11 can be achieved.

[0079] In some application scenarios, after the second sub-section 1012 is bent along the connection area between it and the first sub-section 1011, the connection area between the first sub-section 1011 and the second section 102 will form a step portion with the edge of the second sub-section 1012, and the step portion has higher requirements for the anti-corrosion treatment process. When the area where the step portion is located is the outside of the first box body 11, it is difficult to meet the anti-corrosion treatment requirements using conventional anti-corrosion treatment processes, such as electrophoresis. Therefore, a more complex process is required to improve the corrosion resistance of the step portion, and a more complex process will lead to reduced production efficiency, and may use more materials, and the economic efficiency will also be reduced. The embodiment of the present application in which the second sub-section 1012 is arranged between the first sub-section 1011 and the thermal management component 30 along the first direction can relatively improve production efficiency and improve economic efficiency.

[0080] In some embodiments of the present application, the thermal management component 30 includes a main body 301 and an edge portion 302, and the main body 301 is formed with a flow channel 3011 for circulating a heat exchange medium. The main body 301 and the edge portion 302 constitute at least a part of the thermal management component 30. The edge portion 302 is arranged on the periphery of the main body 301, and the edge portion 302 is connected to the first portion 101.

[0081] In some examples, the thickness of the first portion 101 is defined as d 1 , the thickness of the edge portion 302 is defined as d 2 , d 1 ≥d 2 In some embodiments, when the edge portion 302 is riveted to the first portion 101 , setting the thickness of the first portion 101 to be greater than or equal to the thickness of the edge portion 302 can increase the connection strength between the edge portion 302 and the first portion 101 .

[0082] In some embodiments of the present application, d 1 ≤3*d 2 . The thickness of the first part 101 increases, and the connection strength between the first part 101 and the edge part 302 increases. In actual situations, as the thickness of the first part 101 increases, on the one hand, the weight of the first box body 11 that is finally formed will also increase accordingly. In some application scenarios, the increase in the weight of the first box body 11 will not only affect the lightweight of the first box body 11 itself, but also require higher strength requirements for the equipment that carries the battery device 100, resulting in a further increase in the mass of the final electrical device, and then a decrease in the economy of the final electrical device. On the other hand, as the thickness of the first part 101 increases, the use of materials will increase accordingly, and the economy will further decrease. Based on this situation, in this embodiment, the thickness of the first part 101 is set to no more than three times the thickness of the edge part 302, which can improve the connection strength between the first part 101 and the edge part 302 while taking into account economy.

[0083] In some embodiments of the present application, the first portion 101 and the thermal management component 30 are connected by self-piercing riveting. Compared with ordinary riveting, the connection strength of self-piercing riveting is relatively higher and the fatigue resistance is also better.

[0084] In some embodiments of the present application, the first part 101 and the thermal management component 30 are connected by a rivet 40 when self-piercing riveting is adopted. Along the first direction, the end of the rivet 40 away from the thermal management component 30 is located in the first part 101. In this embodiment, the thickness of the first part 101 can be set so that when the first part 101 and the thermal management component 30 are riveted, the tip of the connecting rivet 40 is located in the first part 101. While improving the connection strength, it is difficult for the connecting rivet 40 to form a hole at the end of the first part 101 away from the thermal management component 30 in the first direction, thereby reducing the reduction of the airtightness of the first box 11 due to the appearance of the hole during the connection process between the first part 101 and the thermal management component 30.

[0085] In some embodiments of the present application, the thermal management component 30 carries the battery cell assembly, and along the first direction, the first portion 101 is located on the side of the thermal management component 30 away from the battery cell assembly. Through this arrangement, the first portion 101 carries the thermal management component 30, so that the thermal management component 30 can maintain good contact with the battery cell 20, thereby enabling the thermal management component 30 to always achieve good heat dissipation performance.

[0086] For some examples, see Figure 3 Part of the thermal management component 30 is arranged between the first box 11 and the battery cell assembly, and another part of the thermal management component 30 is flush with the first box 11 or located outside the first box 11, forming a bottom structure. Part of the thermal management component 30 is flush with the first box 11 or located outside the first box 11, which can increase the contact area between the thermal management component 30 and the outside, thereby improving the heat dissipation performance of the thermal management component 30.

[0087] In other examples, the thermal management component 30 may be entirely located between the first box body 11 and the battery cell assembly. While carrying the thermal management component 30 and the battery cell assembly, the first box body 11 can also provide better protection for the thermal management component 30 and the battery cell assembly, thereby reducing the impact of external factors on the thermal management component 30, such as scratches, collisions, etc., on the thermal management component 30.

[0088] In some embodiments of the present application, the first box body 11 may be formed by at least one of stamping and roll forming.

[0089] In some examples, the first housing 11 is formed by stamping or roll forming, so that the first sub-portion 1011, the second sub-portion 1012, and the second portion 102 of the first housing 11 can be integrally formed by one process during the forming process, and the thickness after forming is the same, without the need for multiple forming processes. Then, after forming, the second sub-portion 1012 is bent, so that the first sub-portion 1011 and the second sub-portion 1012 are stacked to increase the thickness of the first portion 101, thereby improving the connection strength between the first portion 101 and the thermal management component 30.

[0090] In some embodiments of the present application, a battery device is provided, which includes a first box body 11, a battery cell assembly and a thermal management component 30. The battery cell assembly is accommodated in the first box body 11, and the thermal management component 30 includes a main body 301 and an edge portion 302. The edge portion 302 is accommodated in the first box body 11, and the main body 301 can be at least partially accommodated in the first box body 11. The first box body 11 includes a first portion 101 and a second portion 102, the first portion 101 is connected to the edge portion 302, and the second portion 102 is connected to the outer periphery of the first portion 101. The first portion 101 includes a first sub-portion 1011 and a second sub-portion 1012, the second sub-portion 1012 is connected to the inner periphery of the first sub-portion 1011, and the second portion 102 is connected to the outer periphery of the first sub-portion 1011. The first sub-portion 1011, the second sub-portion 1012 and the second portion 102 can be integrally formed by stamping or roll forming, and the thickness of the three after forming is the same. Then, the second sub-section 1012 is bent relative to the first sub-section 1011 to form a stacked structure. After being bent relative to the first sub-section 1011, the second sub-section 1012 is located between the thermal management component 30 and the first sub-section 1011. The second sub-section 1012 and the first sub-section 1011 are connected by welding in the stacked connection area, so that the first section 101 formed by the first sub-section 1011 and the second sub-section 1012 has a thickness greater than that of the second section 102. The first section 101 and the edge section 302 formed in the end are connected by self-piercing riveting, and the thickness of the first section 101 is increased, which can improve the connection strength between the first section 101 and the edge section 302.

[0091] The following is further explained in conjunction with specific application scenarios. In some application scenarios, the thermal management component 30 can be a model with an edge portion 302 thickness of 2.0 mm. The first sub-portion 1011, the second sub-portion 1012 and the second portion 102 can be integrally formed by stamping or roll forming, and the final thickness of the formed portion is the same, which is 1.2 mm. Then, the second sub-portion 1012 is folded relative to the first sub-portion 1011 to form a dead edge structure, and the folded first sub-portion 1011 and the second sub-portion 1012 are welded to reduce the rebound of the second sub-portion 1012. The overall thickness of the laminated structure formed by the first sub-section 1011 and the second sub-section 1012 can reach 2.4 mm. At this time, the thickness of the first section 101 is greater than the thickness of the thermal management component 30. When the first section 101 and the edge section 302 are subsequently self-piercing riveted, the end of the connecting rivet 40 away from the thermal management component 30 can always be located in the first section 101, and the tip of the rivet 40 is difficult to pass through the first section 101, so it is difficult for the first box 11 to be damaged due to the process of self-piercing riveting. It should be noted that the above content is only for the purpose of providing a more detailed explanation of the present application in combination with specific application scenarios, and should not be considered as a limitation of the present application.

[0092] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that: include: The first box; A battery cell assembly, contained in the first box, wherein the battery cell assembly includes a plurality of battery cells; A thermal management component, used to adjust the temperature of the battery cell; The first box body includes a first part and a second part, the first part is connected to the thermal management component, and the second part is connected to the periphery of the first part; the thickness of the first part is greater than the thickness of the second part.

2. The battery device according to claim 1, characterized in that: The first portion includes a first sub-portion and a second sub-portion stacked along a first direction, the second portion is connected to the outer periphery of the first sub-portion, and the second sub-portion is connected to the inner periphery of the first sub-portion; the first direction is the thickness direction of the thermal management component.

3. The battery device according to claim 2, characterized in that: The first sub-portion, the second sub-portion and the second portion are integrally formed.

4. The battery device according to claim 2, characterized in that: The first sub-portion, the second sub-portion and the second portion have the same thickness.

5. The battery device according to claim 2, characterized in that: The first sub-portion and the second sub-portion are welded.

6. The battery device according to claim 2, characterized in that: Along the first direction, the second sub-portion is disposed between the first sub-portion and the heat management component.

7. The battery device according to any one of claims 1 to 6, characterized in that: The heat management component includes a main body and an edge portion, wherein the main body is formed with a flow channel for circulating a heat exchange medium, and the edge portion is arranged on the outer periphery of the main body and connected to the first portion; The thickness of the first portion is d1, the thickness of the edge portion is d2, and d1≥d2.

8. The battery device according to claim 7, characterized in that: d1≤3*d2.

9. The battery device according to any one of claims 1 to 6, characterized in that: The first portion and the thermal management component are connected by self-piercing riveting.

10. The battery device according to claim 9, characterized in that: The first part is connected to the thermal management component by a rivet, and along a first direction, one end of the rivet away from the thermal management component is located in the first part; the first direction is the thickness direction of the thermal management component.

11. The battery device according to any one of claims 1 to 6, characterized in that: The thermal management component carries the battery cell assembly, and along a first direction, the first portion is located on a side of the thermal management component away from the battery cell assembly; the first direction is a thickness direction of the thermal management component.

12. The battery device according to any one of claims 1 to 6, characterized in that: The first box body is formed by stamping or rolling.

13. An electrical device, characterized in that: A battery device comprising any one of claims 1 to 12.

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