Battery device and electric equipment

Abstract

The utility model relates to a battery device and electric equipment, the battery device comprises a box body and a battery monomer, the battery monomer is arranged in the box body, the battery monomer comprises a shell, an electrode assembly and an electrode terminal, the shell is provided with a first end part and a second end part which are oppositely arranged along a first direction, the electrode assembly is arranged in the shell, and the electrode terminal is arranged in the shell. The first end part is used for supporting the electrode assembly, all the electrode terminals are arranged at the first end part, and the first direction is the height direction of the battery monomer; in the direction from the first end to the second end, the shell comprises a first body area and a second body area located above the first body area, and the wall thickness of the first body area is larger than that of the second body area. The electric equipment comprises the battery device. According to the battery device and the electric equipment, the wall thickness of the first body area is greater than that of the second body area, so that the rigidity of the bottom area of the battery monomer is relatively high, and the bottom ball impact resistance of the battery device of the inverted battery monomer is effectively improved.

Description

Technical Field

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

[0002] With the popularization and promotion of new energy vehicles, their charging and discharging performance and range have increasingly attracted people's attention and importance. As the power source for new energy vehicles, batteries are widely used.

[0003] Currently, in battery devices with inverted battery cells, a protective structure consisting of two layers of protective plates and a cavity is typically installed at the bottom of the battery device. Energy is absorbed through the deformation of the protective structure. However, this protective structure cannot withstand high-energy moving ball conditions, resulting in poor resistance to bottom ball impact in battery devices with inverted battery cells and a high risk of weld failure in the battery device. Utility Model Content

[0004] Therefore, it is necessary to provide a battery device and electrical equipment to address the problem of poor resistance to bottom ball impact in existing inverted battery cell battery devices.

[0005] A battery device includes a housing and battery cells. The battery cells are disposed within the housing and include a casing, an electrode assembly, and electrode terminals. The casing has a first end and a second end disposed opposite each other along a first direction. The electrode assembly is disposed within the casing. The first end supports the electrode assembly, and all electrode terminals are located at the first end. The first direction is the height direction of the battery cell. In the direction from the first end to the second end, the casing includes a first body region and a second body region located above the first body region. The wall thickness of the first body region is greater than the wall thickness of the second body region. In this battery device, the battery cells are inverted within the housing. The casing of the battery cell is divided into a first body region and a second body region from bottom to top. The wall thickness of the first body region is greater than the wall thickness of the second body region, resulting in greater rigidity in the bottom region of the battery cell. When the bottom of the housing is subjected to dynamic ball impact, this helps reduce the degree of buckling deformation of the battery cell during the impact, effectively improving the bottom ball impact resistance of the inverted battery cell device and reducing the risk of weld failure in the inverted battery cell device.

[0006] In some embodiments, the wall thickness of the first body region ranges from 0.8 mm to 1.0 mm. Thus, by limiting the wall thickness range of the first body region, the rigidity of the bottom area of ​​the battery cell casing can be appropriately controlled, providing sufficient resistance to bottom ball impacts without making the casing excessively heavy.

[0007] In some embodiments, the wall thickness of the first body region ranges from 0.8 mm to 0.85 mm. Thus, by limiting the wall thickness of the first body region to an optimal range, the rigidity of the bottom region of the battery cell's casing is further optimized, balancing the casing's resistance to bottom ball impacts and its weight.

[0008] In some embodiments, the wall thickness of the second body region ranges from 0.3 mm to 0.7 mm. Thus, by limiting the wall thickness range of the second body region, the rigidity of the upper region of the battery cell casing can be made appropriate, providing sufficient impact resistance without making the casing too heavy.

[0009] In some embodiments, the wall thickness of the second body region ranges from 0.4 mm to 0.5 mm. Thus, by limiting the wall thickness of the second body region to an optimal range, the rigidity of the upper region of the battery cell casing is further optimized, balancing the impact resistance and weight of the casing.

[0010] In some embodiments, the height of the first body region in the first direction ranges from 5mm to 10mm. Thus, by limiting the height range of the first body region, the area occupied by the first body region of the battery cell casing can be appropriately sized, providing sufficient impact resistance without making the casing excessively heavy.

[0011] In some embodiments, the housing has two first side surfaces disposed opposite each other along a second direction, the second direction being the width direction of the battery cell; in either first side surface, the wall thickness of the entire first body region is greater than the wall thickness of the second body region. Thus, by making the wall thickness of the entire first body region of each large surface greater than the wall thickness of the second body region, the overall thickness of the first body region of each large surface is increased, which helps to improve the battery cell housing's resistance to bottom ball impact.

[0012] In some embodiments, the housing has two first side surfaces disposed opposite each other along a second direction, which is the width direction of the battery cell; in either first side surface, the wall thickness of a local area of ​​the first body region is greater than the wall thickness of the second body region. Thus, by making the wall thickness of a local area of ​​the first body region of each large surface greater than the wall thickness of the second body region, the local thickness of the first body region of each large surface is increased, which helps to improve the battery cell housing's resistance to bottom ball impacts and also helps to control the weight of the housing.

[0013] In some embodiments, a localized area of ​​the first body region is a region located above the electrode terminals and extending 4mm to 5mm on both sides of the center of the electrode terminals along a third direction, where the third direction is the length direction of the battery cell. Thus, by locally thickening the first body region of each large surface area, the battery cell's casing's resistance to bottom ball impacts is improved, and the casing's weight is controlled.

[0014] In some embodiments, the housing further has two second sides disposed opposite each other along a third direction, which is the length direction of the battery cell; in either second side, the wall thickness of the first body region is greater than the wall thickness of the second body region. Thus, by thickening the first body region of each side, it is beneficial to further improve the battery cell housing's resistance to bottom ball impact.

[0015] In some embodiments, the battery device further includes a cooling element disposed on at least one side of the battery cell along the second direction. Thus, by providing a cooling element on at least one side of the battery cell along the second direction, the battery cell can dissipate heat quickly, which is beneficial to the stability of the battery cell in use.

[0016] In some embodiments, in the first direction, the cooling element is spaced apart from the first end and forms a receiving space; the battery device further includes a reinforcing element disposed on at least one side of the battery cell along the second direction, and the reinforcing element is housed within the receiving space. Thus, by providing a reinforcing element on at least one side of the battery cell along the second direction, and with the reinforcing element located below the cooling element, the rigidity of the bottom region of the battery device can be strengthened, effectively improving the resistance of the inverted battery cell battery device to bottom ball impact and reducing the risk of weld failure in the inverted battery cell battery device.

[0017] In some embodiments, in a first direction, the reinforcing member has a first edge and a second edge disposed opposite to each other, the first edge being flush with the first end, and the second edge abutting against the cooling member. This maximizes the height of the reinforcing member within a limited space, increases the range of its placement, further strengthens the rigidity of the bottom region of the battery device, and effectively improves the resistance of the inverted battery cell to bottom ball impacts.

[0018] In some embodiments, the elastic modulus of the reinforcing member is 0.3 MPa to 500 MPa. Thus, by limiting the range of the elastic modulus of the reinforcing member, the stiffness of the reinforcing member can be made appropriate, which helps to reduce the degree of buckling deformation of the battery cells during dynamic ball impact when the bottom of the housing is subjected to the ball impact.

[0019] In some embodiments, the elastic modulus of the reinforcing member is 0.3 MPa to 10 MPa. Thus, by limiting the elastic modulus of the reinforcing member to an optimal range, the stiffness of the reinforcing member can be further optimized, and the degree of buckling deformation of the battery cell during ball impact can be further reduced.

[0020] An electrical device includes the aforementioned battery assembly. In this electrical device, individual battery cells are inverted within a housing. The casing of each battery cell is divided from bottom to top into a first body region and a second body region. The wall thickness of the first body region is greater than that of the second body region, resulting in greater rigidity at the bottom of the battery cell. This reduces the degree of buckling deformation of the battery cell during dynamic ball impacts to the bottom of the housing, effectively improving the battery assembly's resistance to bottom ball impacts and reducing the risk of weld failure in the inverted battery cell assembly. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the electrical equipment in some embodiments of this application.

[0022] Figure 2 This is a schematic diagram of a battery device in some embodiments of this application.

[0023] Figure 3 for Figure 2 A schematic diagram of the internal structure of the battery device shown.

[0024] Figure 4 This is an isometric view of the housing of the battery device in some embodiments of this application.

[0025] Figure 5 for Figure 4 A cross-sectional view of the casing of the battery device shown.

[0026] Figure 6 This is an isometric view of the housing of the battery device in some other embodiments of this application.

[0027] Figure 7 for Figure 6 A cross-sectional view of the casing of the battery device shown.

[0028] Figure label:

[0029] 10. Vehicle; 11. Controller; 12. Motor; 20. Battery assembly;

[0030] 100. Housing; 101. First part; 102. Second part; 200. Battery cell; 210. Shell; 210a. First body area; 210b. Second body area; 211. First end; 212. Second end; 213. First side; 214. Second side; 230. Electrode terminal; 300. Cooling component; 400. Reinforcing component; 401. First edge; 402. Second edge; 500. Buffer foam; 600. Mica board; 700. Composite material board; 800. Honeycomb board; 900. Bottom protection plate. Detailed Implementation

[0031] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0033] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0034] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0035] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0036] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0037] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0038] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0039] With the popularization and promotion of new energy vehicles, their charging and discharging performance and range are increasingly attracting attention and importance. Power batteries, a type of rechargeable battery, are the power source for new energy vehicles and are widely used in the field.

[0040] Currently, in the battery assembly process, the tabs are typically gathered together, bent, and then electrically connected to the electrode terminals of the top cover via an adapter. This means the tabs are folded on the top side of the battery cell. In this top-side tab-folding assembly method, the increased thickness of the tab layers significantly increases the vertical space occupied by the bent tabs. Furthermore, the need to stack an adapter on top of the bent tabs further occupies vertical space within the battery cell, resulting in lower internal space utilization and lower battery capacity.

[0041] Based on the above considerations, and after in-depth research, a battery device and electrical equipment were designed. In the battery device, the battery cell is inverted and placed inside the housing. The shell of the battery cell is divided into a first body area and a second body area from bottom to top. The wall thickness of the first body area is greater than that of the second body area, which makes the bottom area of ​​the battery cell more rigid. When the bottom of the housing is subjected to dynamic ball impact, it helps to reduce the degree of buckling deformation of the battery cell during the ball impact, effectively improving the bottom ball impact resistance of the battery device with inverted battery cells and reducing the risk of weld failure of the battery device with inverted battery cells.

[0042] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0043] For ease of explanation, the following embodiments will be described using a vehicle 10 as an example of an electrical device according to an embodiment of this application.

[0044] Please refer to Figure 1 Vehicle 10 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 20 is installed inside vehicle 10, and the battery device 20 can be located at the bottom, front, or rear of vehicle 10. The battery device 20 can be used to power vehicle 10; for example, it can serve as the operating power source for vehicle 10. Vehicle 10 may also include a controller 11 and a motor 12. The controller 11 controls the battery device 20 to supply power to the motor 12, for example, to meet the power needs of vehicle 10 during starting, navigation, and driving. In other embodiments of this application, the battery device 20 can not only serve as the operating power source for vehicle 10 but also as the driving power source for vehicle 10, replacing or partially replacing gasoline or natural gas to provide driving force for vehicle 10.

[0045] In some embodiments of this application, the battery device 20 can not only serve as the operating power source for the vehicle 10, but also as the driving power source for the vehicle 10, replacing or partially replacing fuel or natural gas to provide driving force for the vehicle 10.

[0046] Please refer to Figures 2 to 4 In one embodiment, the battery device 20 includes a housing 100 and a battery cell 200. The battery cell 200 is disposed within the housing 100 and includes a housing 210, an electrode assembly, and electrode terminals 230. The housing 210 has a first end 211 and a second end 212 disposed opposite to each other along a first direction. The electrode assembly is disposed within the housing 210. The first end 211 is used to support the electrode assembly, and all electrode terminals 230 are disposed at the first end 211. The first direction is the height direction of the battery cell 200. In the direction from the first end 211 to the second end 212, the housing 210 includes a first body region 210a and a second body region 210b located above the first body region 210a. The wall thickness of the first body region 210a is greater than the wall thickness of the second body region 210b.

[0047] It should be noted that the first direction is Figures 3 to 4The Z direction shown is the height direction of the battery cell 200. The direction from the first end 211 to the second end 212, i.e., along... Figures 3 to 4 The Z-direction shown points from the bottom to the top. The first end 211 is the bottom surface of the housing 210, and the second end 212 is the top surface of the housing 210. When the battery device 20 is in normal use, the first end 211 is located below the electrode terminal 230.

[0048] In the embodiments of this application, the housing 100 is used to provide a receiving space for the battery cell 200, and the housing 100 can adopt various structures. The housing 100 includes a first part 101 and a second part 102, which overlap each other, and the first part 101 and the second part 102 together define a receiving space for accommodating the battery cell 200. The second part 102 can be a hollow structure with one end open, and the first part 101 can be a plate-like structure, with the first part 101 covering the open side of the second part 102 so that the first part 101 and the second part 102 together define the receiving space; the first part 101 and the second part 102 can also both be hollow structures with one end open, with the open side of the first part 101 covering the open side of the second part 102. Of course, the housing 100 formed by the first part 101 and the second part 102 can be of various shapes, such as a cylinder, a cuboid, etc. Here, the first part 101 is located above the second part 102, the first end 211 can be the bottom surface of the second part 102, and the second end 212 can be the top surface of the first part 101.

[0049] In the battery device 20, individual battery cells 200 are inverted and disposed within the housing 100. There can be multiple individual battery cells 200, which can be connected in series, parallel, or a combination thereof. A combination of series and parallel connections means that multiple individual battery cells 200 are connected in both series and parallel configurations. Multiple individual battery cells 200 can be directly connected in series, parallel, or a combination thereof, and then the entire assembly is housed within the housing 100. Alternatively, the battery device 20 can consist of multiple individual battery cells 200 first connected in series, parallel, or a combination thereof to form battery modules, which are then connected in series, parallel, or a combination thereof to form a whole and housed within the housing 100. The battery device 20 may also include other structures, such as a busbar component for electrical connection between the multiple individual battery cells 200. Each individual battery cell 200 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The individual battery cell 200 can be cylindrical, flat, cuboid, or other shapes.

[0050] Here, the battery device 20 also includes a cushioning foam 500, a mica plate 600, a composite material plate 700, a honeycomb plate 800, and a bottom protective plate 900. The cushioning foam 500, mica plate 600, composite material plate 700, honeycomb plate 800, and bottom protective plate 900 are arranged below the battery cell 200 and stacked sequentially from top to bottom. The cushioning foam 500 provides support and energy absorption, and its thickness ranges from 0.5mm to 5mm; the mica plate 600 provides insulation protection and mechanical support, and its thickness ranges from 0.5mm to 2mm; the composite material plate 700, honeycomb plate 800, and bottom protective plate 900 form a three-layer stacked structure, and the thickness of the three-layer stacked structure ranges from 2mm to 10mm.

[0051] In the embodiments of this application, the housing 210 is a component used to provide a receiving space for the electrode assembly, and the housing 210 can adopt various structures. For example, the housing 210 is a hollow structure with openings at both ends, and two end caps are used to cover the two open sides of the housing 210 to define a closed receiving space. The housing 210 can be in the form of a hollow cylinder, a hollow prism, or other shapes, and no specific limitation is made here.

[0052] In the embodiments of this application, the electrode assembly is the component in the battery cell 200 where the electrochemical reaction occurs. The casing 210 may contain one or at least two electrode assemblies, which are mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the cell assembly, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs may be located at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals 230 to form a current loop.

[0053] In the embodiments of this application, the first body region 210a is defined as the region extending upward from the first end 211 of the housing 210 to a certain range, and the second body region 210b is defined as the region extending upward from the first body region 210a to the second end 212 of the housing 210.

[0054] In the aforementioned battery device 20, the battery cells 200 are inverted and disposed inside the housing 100. The housing 210 of the battery cells 200 is divided into a first body region 210a and a second body region 210b from bottom to top. The wall thickness of the first body region 210a is greater than the wall thickness of the second body region 210b, which makes the bottom area of ​​the battery cells 200 more rigid. When the bottom of the housing 100 is subjected to dynamic ball impact, it helps to reduce the degree of buckling deformation of the battery cells 200 during the ball impact, effectively improving the bottom ball impact resistance of the battery device 20 with inverted battery cells 200 and reducing the risk of weld failure of the battery device 20 with inverted battery cells 200.

[0055] Based on some embodiments in this application, please refer to Figure 4 and Figure 5 The wall thickness of the first body region 210a ranges from 0.8 mm to 1.0 mm.

[0056] It is understandable that the greater the wall thickness of the first body region 210a, the stronger the rigidity of the first body region 210a and the less likely it is to deform; the smaller the wall thickness of the first body region 210a, the weaker the rigidity of the first body region 210a and the more likely it is to deform.

[0057] In the embodiments of this application, the wall thickness of the first body region 210a can be 0.8mm, 0.9mm or 1.0mm.

[0058] By limiting the wall thickness range of the first body area 210a through the above settings, the rigidity of the bottom area of ​​the casing 210 of the battery cell 200 can be made appropriate, which has a certain resistance to bottom ball impact, and the weight of the casing 210 will not be too heavy.

[0059] Based on some embodiments in this application, please refer to Figure 4 and Figure 5 The wall thickness of the first body region 210a ranges from 0.8 mm to 0.85 mm.

[0060] By setting the wall thickness of the first body region 210a within the optimal range, the rigidity of the bottom region of the housing 210 of the battery cell 200 is further optimized, taking into account both the impact resistance of the housing 210 against bottom balls and its weight.

[0061] Based on some embodiments in this application, please refer to Figure 4 and Figure 5 The wall thickness of the second body region 210b ranges from 0.3 mm to 0.7 mm.

[0062] It is understandable that the greater the wall thickness of the second body region 210b, the stronger the rigidity of the second body region 210b and the less likely it is to deform; the smaller the wall thickness of the second body region 210b, the weaker the rigidity of the second body region 210b and the more likely it is to deform.

[0063] In the embodiments of this application, the wall thickness of the second body region 210b can be 0.3mm, 0.5mm or 0.7mm.

[0064] By limiting the wall thickness range of the second body region 210b through the above settings, the rigidity of the upper region of the casing 210 of the battery cell 200 can be made appropriate, which has a certain impact resistance and does not make the weight of the casing 210 too heavy.

[0065] Based on some embodiments in this application, please refer to Figure 4 and Figure 5 The wall thickness of the second body region 210b ranges from 0.4 mm to 0.5 mm.

[0066] By setting the wall thickness of the second body region 210b within the optimal range, the rigidity of the upper region of the housing 210 of the battery cell 200 is further optimized, taking into account both the impact resistance and weight of the housing 210.

[0067] Based on some embodiments in this application, please refer to Figure 4 and Figure 5 In the first direction, the height of the first body region 210a ranges from 5mm to 10mm.

[0068] It should be noted that the height of the first body region 210a is also... Figure 5 As shown in Figure H, the greater the height of the first body region 210a, the larger the range of the first body region 210a, the less likely it is to deform, and the heavier the weight of the shell 210; the smaller the height of the first body region 210a, the smaller the range of the first body region 210a, the easier it is to deform, and the lighter the weight of the shell 210.

[0069] In the embodiments of this application, the height of the first body region 210a can be 5mm, 7mm or 10mm.

[0070] By limiting the height range of the first body area 210a, the area occupied by the first body area 210a of the casing 210 of the battery cell 200 can be made appropriate, which has a certain impact resistance and does not make the weight of the casing 210 too heavy.

[0071] Based on some embodiments in this application, please refer to Figure 4 and Figure 5The housing 210 has two first side surfaces 213 arranged opposite each other along a second direction, the second direction being the width direction of the battery cell 200; in either of the first side surfaces 213, the wall thickness of the entire area of ​​the first body region 210a is greater than the wall thickness of the second body region 210b.

[0072] It should be noted that the second direction is Figure 1 The Y direction shown is the width direction of the battery cell 200. The housing 210 has two first side surfaces 213 arranged opposite to each other along the second direction, which are also the two large surfaces of the battery cell 200.

[0073] In the embodiments of this application, in any first side surface 213, the wall thickness of the entire area of ​​the first body region 210a is greater than the wall thickness of the second body region 210b. That is, in the two large surfaces, the wall thickness of the entire area of ​​the first body region 210a of each large surface is greater than the wall thickness of the second body region 210b.

[0074] By making the wall thickness of the entire first body region 210a of each large surface greater than the wall thickness of the second body region 210b, the overall thickness of the first body region 210a of each large surface is increased, which helps to improve the resistance of the casing 210 of the battery cell 200 to bottom ball impact.

[0075] Based on some embodiments in this application, please refer to Figure 6 and Figure 7 The housing 210 has two first side surfaces 213 disposed opposite to each other along a second direction, the second direction being the width direction of the battery cell 200; in either of the first side surfaces 213, the wall thickness of a local area of ​​the first body region 210a is greater than the wall thickness of the second body region 210b.

[0076] It is understandable that in any first side 213, the wall thickness of a local area of ​​the first body region 210a is greater than the wall thickness of the second body region 210b. That is, in the two large surfaces, the wall thickness of a local area of ​​the first body region 210a of each large surface is greater than the wall thickness of the second body region 210b.

[0077] In the embodiments of this application, in the two large surfaces, except for the thickened local area, the wall thickness of the other areas of the first body region 210a of each large surface is equal to the wall thickness of the second body region 210b.

[0078] By making the wall thickness of a local area of ​​the first body region 210a of each large surface greater than the wall thickness of the second body region 210b, the local thickness of the first body region 210a of each large surface is increased, which helps to improve the impact resistance of the casing 210 of the battery cell 200 and helps to control the weight of the casing 210.

[0079] Based on some embodiments in this application, please refer to Figure 6 and Figure 7 The local area of ​​the first body region 210a is a region located above the electrode terminal 230 and extending 4mm to 5mm on both sides of the center of the electrode terminal 230 along a third direction, where the third direction is the length direction of the battery cell 200.

[0080] It should be noted that the third party is... Figure 6 and Figure 7 The X direction shown is the length direction of the battery cell 200.

[0081] In the embodiments of this application, a local area of ​​the first body region 210a is a region located above the electrode terminal 230 and extending 4mm to 5mm from the center of the electrode terminal 230 along a third direction on both sides; that is, a local area located above the electrode terminal 230. The number of local areas of the first body region 210a is not limited to one, and the number of electrode terminals 230 is two with opposite polarities, with at least one local area provided above each electrode terminal 230.

[0082] By making the first body area 210a of each large surface locally thickened, it is beneficial to improve the impact resistance of the casing 210 of the battery cell 200 against bottom ball impact, and also to control the weight of the casing 210.

[0083] Based on some embodiments in this application, please refer to Figure 6 The housing 210 also has two second side surfaces 214 disposed opposite each other along a third direction, the third direction being the length direction of the battery cell 200; in either of the second side surfaces 214, the wall thickness of the first body region 210a is greater than the wall thickness of the second body region 210b.

[0084] It should be noted that the third party is... Figure 6 The X direction shown is the length direction of the battery cell 200. The housing 210 has two second side surfaces 214 arranged opposite each other along a third direction, which are also the two side surfaces of the battery cell 200.

[0085] In the embodiments of this application, in any second side 214, the wall thickness of the first body region 210a is greater than the wall thickness of the second body region 210b. That is, in both sides, the wall thickness of the first body region 210a on each side is greater than the wall thickness of the second body region 210b.

[0086] By making the first body area 210a on each side thicker, the battery cell 200's casing 210 is made more resistant to bottom ball impact.

[0087] Based on some embodiments in this application, please refer to Figure 3 The battery device 20 also includes a cooling element 300, which is disposed on at least one side of the battery cell 200 along the second direction.

[0088] It is understood that the cooling element 300 is disposed on at least one side of the battery cell 200 along the second direction, that is, the cooling element 300 is disposed on one side of the battery cell 200 along the second direction, or the cooling element 300 is disposed on at least two sides of the battery cell 200 along the second direction.

[0089] In the embodiments of this application, the cooling component 300 is a component used to dissipate heat for the battery cell 200. The cooling component 300 can be a liquid cooling plate, which can be a harmonica tube type or other types of heat dissipation components.

[0090] With the above configuration, by providing a cooling element 300 on at least one side of the battery cell 200 along the second direction, the battery cell 200 can dissipate heat quickly, which is beneficial to the stability of the battery cell 200 in use.

[0091] Based on some embodiments in this application, please refer to Figure 3 In the first direction, the cooling member 300 is spaced apart from the first end 211 and forms a receiving space; the battery device 20 also includes a reinforcing member 400, which is disposed on at least one side of the battery cell 200 along the second direction and is housed within the receiving space.

[0092] It should be noted that, due to the first direction (i.e. Figure 1 In the Z direction shown, the bottom side of the cooling component 300 is not flush with the bottom surface of the battery cell 200, that is, a receiving space is formed below the cooling component 300.

[0093] In the embodiments of this application, the reinforcing member 400 is a component housed within the receiving space and used to enhance the rigidity of the battery device 20. The reinforcing block can be made of silicone, composite material (e.g., plastic + glass fiber phase composite), plastic, or buffer material (e.g., rigid polyurethane).

[0094] In the embodiments of this application, the reinforcing block can be fixed to at least one side of the battery cell 200 along the second direction in a variety of ways. For example, the reinforcing block is a gel and is cured on the battery cell 200, or the reinforcing block is a non-gel and is adhered to the battery cell 200 by double-sided adhesive.

[0095] With the above arrangement, a reinforcing member 400 is provided on at least one side of the battery cell 200 along the second direction, and the reinforcing member 400 is located below the cooling member 300. This can strengthen the rigidity of the bottom area of ​​the battery device 20, effectively improve the battery device 20 of the inverted battery cell 200's resistance to bottom ball impact, and reduce the risk of weld failure of the battery device 20 of the inverted battery cell 200.

[0096] Based on some embodiments in this application, please refer to Figure 3 In the first direction, the reinforcing member 400 has a first edge 401 and a second edge 402 disposed opposite to each other. The first edge 401 is flush with the first end 211, and the second edge 402 abuts against the cooling member 300.

[0097] It is understood that the first edge 401 is the bottom side of the reinforcing member 400, the first end 211 is the bottom surface of the housing 210, and the bottom side of the reinforcing member 400 is flush with the bottom surface of the housing 210; the second edge 402 is the top side of the reinforcing member 400, and the top side of the reinforcing member 400 abuts against the bottom side of the cooling member 300.

[0098] Through the above settings, the height of the reinforcing member 400 can be maximized within a limited space, the installation range of the reinforcing member 400 can be increased, the rigidity of the bottom area of ​​the battery device 20 can be further strengthened, and the resistance of the battery device 20 of the inverted battery cell 200 to bottom ball impact can be effectively improved.

[0099] Based on some embodiments in this application, please refer to Figure 3 The elastic modulus of the reinforcing component 400 is 0.3MPa~500MPa.

[0100] It should be noted that the elastic modulus refers to the ability of the reinforcing part 400 to resist deformation during the elastic deformation stage. The larger the elastic modulus, the greater the hardness of the reinforcing part 400 and the less likely it is to deform.

[0101] In the embodiments of this application, the elastic modulus of the reinforcing member 400 can be 0.3MPa, 100MPa or 500MPa.

[0102] By limiting the range of elastic modulus of the reinforcing member 400, the stiffness of the reinforcing member 400 can be made appropriate, which helps to reduce the degree of buckling deformation of the battery cell 200 during the ball impact when the bottom of the housing 100 is subjected to dynamic ball impact.

[0103] Based on some embodiments in this application, please refer to Figure 3 The elastic modulus of the reinforcing component 400 is 0.3MPa~10MPa.

[0104] By setting the above parameters and limiting the elastic modulus of the reinforcing member 400 to the optimal range, the stiffness of the reinforcing member 400 can be further optimized, and the degree of buckling deformation of the battery cell 200 during ball impact can be further reduced.

[0105] Please refer to Figure 1 An electrical device includes the aforementioned battery device 20.

[0106] In the aforementioned electrical equipment, the battery cell 200 is inverted and installed inside the housing 100. The housing 210 of the battery cell 200 is divided into a first body area 210a and a second body area 210b from bottom to top. The wall thickness of the first body area 210a is greater than the wall thickness of the second body area 210b, which makes the bottom area of ​​the battery cell 200 more rigid. When the bottom of the housing 100 is subjected to dynamic ball impact, it helps to reduce the degree of buckling deformation of the battery cell 200 during the ball impact, effectively improving the bottom ball impact resistance of the battery device 20 of the inverted battery cell 200 and reducing the risk of weld failure of the battery device 20 of the inverted battery cell 200.

[0107] According to some embodiments in this application, see Figures 1 to 7 In one embodiment, the battery device 20 includes a housing 100, a battery cell 200, a cooling element 300, and a reinforcing element 400. The battery cell 200 is disposed within the housing 100. The cooling element 300 is disposed on at least one side of the battery cell 200 along a second direction. In a first direction, the cooling element 300 is spaced apart from the first end 211 and forms a receiving space. The reinforcing element 400 is disposed on at least one side of the battery cell 200 along the second direction and is housed within the receiving space. The elastic modulus of the reinforcing element 400 is 0.3 MPa to 10 MPa.

[0108] The battery cell 200 includes a housing 210, an electrode assembly, and electrode terminals 230. The housing 210 has a first end 211 and a second end 212 disposed opposite to each other along a first direction. The electrode assembly is disposed within the housing 210. The first end 211 supports the electrode assembly, and all electrode terminals 230 are disposed at the first end 211. The first direction is the height direction of the battery cell 200. In the direction from the first end 211 to the second end 212, the housing 210 includes a first body region 210a and a second body region 210b located above the first body region 210a. The wall thickness of the first body region 210a is greater than the wall thickness of the second body region 210b. The wall thickness of the first body region 210a ranges from 0.8mm to 0.85mm, and the wall thickness of the second body region 210b ranges from 0.4mm to 0.5mm.

[0109] According to some embodiments in this application, see Figure 1 In one embodiment, the electrical device includes the battery device 20 described above.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device (20), characterized in that, include: Box (100); A battery cell (200) is disposed within the housing (100); the battery cell (200) includes a housing (210), an electrode assembly, and electrode terminals (230). The housing (210) has a first end (211) and a second end (212) disposed opposite to each other along a first direction. The electrode assembly is disposed within the housing (210). The first end (211) is used to support the electrode assembly. All of the electrode terminals (230) are disposed at the first end (211). The first direction is the height direction of the battery cell (200). In the direction from the first end (211) to the second end (212), the housing (210) includes a first body region (210a) and a second body region (210b) located above the first body region (210a), wherein the wall thickness of the first body region (210a) is greater than the wall thickness of the second body region (210b).

2. The battery device (20) according to claim 1, characterized in that, The wall thickness of the first body region (210a) ranges from 0.8 mm to 1.0 mm.

3. The battery device (20) according to claim 2, characterized in that, The wall thickness of the first body region (210a) ranges from 0.8 mm to 0.85 mm.

4. The battery device (20) according to any one of claims 1 to 3, characterized in that, The wall thickness of the second body region (210b) ranges from 0.3 mm to 0.7 mm.

5. The battery device (20) according to claim 4, characterized in that, The wall thickness of the second body region (210b) ranges from 0.4 mm to 0.5 mm.

6. The battery device (20) according to any one of claims 1 to 3, characterized in that, In the first direction, the height of the first body region (210a) ranges from 5 mm to 10 mm.

7. The battery device (20) according to claim 1, characterized in that, The housing (210) has two first side surfaces (213) arranged opposite each other along a second direction, the second direction being the width direction of the battery cell (200); In any of the first side (213), the wall thickness of the entire area of ​​the first body region (210a) is greater than the wall thickness of the second body region (210b).

8. The battery device (20) according to claim 1, characterized in that, The housing (210) has two first side surfaces (213) arranged opposite each other along a second direction, the second direction being the width direction of the battery cell (200); In any of the first side surfaces (213), the wall thickness of a local area of ​​the first body region (210a) is greater than the wall thickness of the second body region (210b).

9. The battery device (20) according to claim 8, characterized in that, The local area of ​​the first body region (210a) is a region located above the electrode terminal (230) and extending 4mm to 5mm on both sides of the center of the electrode terminal (230) along a third direction, where the third direction is the length direction of the battery cell (200).

10. The battery device (20) according to claim 8, characterized in that, The housing (210) also has two second side surfaces (214) arranged opposite each other along a third direction, the third direction being the length direction of the battery cell (200); In any of the second side (214), the wall thickness of the first body region (210a) is greater than the wall thickness of the second body region (210b).

11. The battery device (20) according to claim 7 or 8, characterized in that, The battery device (20) further includes a cooling element (300) disposed on at least one side of the battery cell (200) along the second direction.

12. The battery device (20) according to claim 11, characterized in that, In the first direction, the cooling element (300) is spaced apart from the first end (211) and forms a receiving space; The battery device (20) further includes a reinforcing member (400) disposed on at least one side of the battery cell (200) along the second direction, and the reinforcing member (400) is housed within the receiving space.

13. The battery device (20) according to claim 12, characterized in that, In the first direction, the reinforcing member (400) has a first edge (401) and a second edge (402) disposed opposite to each other, the first edge (401) being flush with the first end (211) and the second edge (402) abutting against the cooling member (300).

14. The battery device (20) according to claim 12, characterized in that, The elastic modulus of the reinforcing member (400) is 0.3MPa~500MPa.

15. The battery device (20) according to claim 14, characterized in that, The elastic modulus of the reinforcing member (400) is 0.3MPa~10MPa.

16. An electrical appliance, characterized in that, Includes the battery device (20) as described in any one of claims 1-15.

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