A battery pack and electrical device

Abstract

This application belongs to the field of battery technology and discloses a battery pack and electrical equipment. The battery pack includes a shell, crossbeams, and longitudinal beams. The shell has a receiving cavity. The crossbeams are disposed in the receiving cavity along a first direction and connected to the shell. The longitudinal beams are disposed in the receiving cavity along a second direction and connected to the shell. The number of crossbeams is x, the width of the crossbeams is a2mm, and the height of the crossbeams is a3mm. Each crossbeam has a first inner cavity extending along the first direction X, and the number of first inner cavities is a1. The number of longitudinal beams is y, the width of the longitudinal beams is b2mm, and the height of the longitudinal beams is b3mm. Each longitudinal beam has a second inner cavity extending along the second direction Y, and the number of second inner cavities is b1. The battery pack satisfies the following relationship: 35Hz ≤ W ≤ 60Hz, where W is the battery pack mode. This application aims to balance the relationship between the vehicle's range, the battery pack weight, and the battery pack stiffness.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery pack and electrical equipment. Background Technology

[0002] With the rise of new energy vehicles, factors such as battery pack energy density and electric vehicle platforms dictate different battery pack designs. When designing a battery pack, its stiffness must exceed that of the entire vehicle; otherwise, resonance may occur, posing a fire and explosion risk. Increasing the weight of the internal support structure or the number of reinforcing ribs to improve battery pack stiffness, while ensuring greater stiffness than the vehicle, increases the battery pack's weight, hindering lightweighting and consequently affecting the vehicle's driving range. Therefore, achieving a balanced relationship between battery pack structure, vehicle range, and battery pack stiffness has become a challenging problem to overcome. Summary of the Invention

[0003] Purpose of the invention: This application provides a battery pack that balances the relationship between the vehicle's range, the battery pack's weight, and the battery pack's stiffness; another purpose of this application is to provide an electrical device.

[0004] Technical solution: Embodiments of this application provide a battery pack, including:

[0005] The shell has a receiving cavity;

[0006] A crossbeam is disposed within the receiving cavity along a first direction and connected to the shell. The number of crossbeams is x, the width of the crossbeam is a2 mm, and the height of the crossbeam is a3 mm. The crossbeam has a first inner cavity that extends along the first direction, and the number of first inner cavities is a1.

[0007] A longitudinal beam is disposed within the receiving cavity along a second direction and connected to the housing, wherein the first direction intersects the second direction, the number of longitudinal beams is y, the width of the longitudinal beam is b2 mm, and the height of the longitudinal beam is b3 mm; the longitudinal beam has a second inner cavity that extends along the second direction, and the number of second inner cavities is b1.

[0008] The battery pack satisfies the following relationship:

[0009] 35Hz≤W≤60Hz, and W=30+(1+0.0005a1*a2*a3)x+(1.2+0.0006b1*b2*b3)y, where W is the battery pack mode, and the number of crossbeams x satisfies 0≤x≤6, or the number of longitudinal beams y satisfies 0≤y≤6.

[0010] In some embodiments, the number a1 of the first inner cavity is such that 1 ≤ a1 ≤ 5.

[0011] In some embodiments, the width a2 of the crossbeam in the battery pack satisfies 20mm≤a2≤30mm.

[0012] In some embodiments, the height a3 of the crossbeam satisfies 60mm≤a3≤80mm.

[0013] In some embodiments, the number b1 of the second inner cavities of the longitudinal beams in the battery pack satisfies 1≤b1≤5.

[0014] In some embodiments, the width b2 of the longitudinal beam satisfies 20mm≤b2≤30mm.

[0015] In some embodiments, the height b3 of the longitudinal beam satisfies 60mm≤b3≤80mm.

[0016] In some embodiments, the beam has a plurality of the first cavities, and the beam includes a first partition extending along the first direction, the first partition spacing two adjacent first cavities;

[0017] The longitudinal beam has a plurality of second inner cavities, and the longitudinal beam includes a second partition extending along the second direction, the second partition spacing two adjacent second inner cavities.

[0018] In some embodiments, the housing of the battery pack includes a base plate and a plurality of side plates surrounding the base plate;

[0019] The first partition is arranged parallel to the bottom plate, or the first partition is arranged parallel to the side plate and perpendicular to the second direction;

[0020] The second partition is arranged parallel to the bottom plate, or the second partition is arranged parallel to the side plate and perpendicular to the first direction.

[0021] Accordingly, the electrical device described in this application includes the battery described in any of the above embodiments.

[0022] Several embodiments of this application have one of the following beneficial effects:

[0023] Compared with the prior art, the battery pack in this solution includes a housing, crossbeams, and longitudinal beams. The housing has a receiving cavity. The crossbeams are disposed in the receiving cavity along a first direction and connected to the housing. The longitudinal beams are disposed in the receiving cavity along a second direction and connected to the housing. The number of crossbeams is x, the width of the crossbeams is a2 mm, and the height of the crossbeams is a3 mm. The crossbeams have a first inner cavity that extends along the first direction X, and the number of first inner cavities is a1. The number of longitudinal beams is y, the width of the longitudinal beams is b2 mm, and the height of the longitudinal beams is b3 mm. The longitudinal beams have a second inner cavity that extends along the second direction Y, and the number of second inner cavities is b1. The battery pack satisfies the following relationship: 35Hz≤W≤60Hz, and W=30+(1+0.0005a1*a2*a3)x+(1.2+0.0006b1*b2*b3)y, where W is the battery pack mode, and the crossbeams are... The quantity x satisfies 0 ≤ x ≤ 6, or the number y of longitudinal beams satisfies 0 ≤ y ≤ 6. This embodiment studies the correlation between the battery pack mode and the number, width, and height of the crossbeams and longitudinal beams. Specifically, the parameters a1, a2, a3, b1, b2, and b3 in the formula represent the number, width, and height of the crossbeams and longitudinal beams, respectively. The coefficients 0.0005 and 0.0006 in the formula indicate the degree of influence of the dimensions of the crossbeams and longitudinal beams on the battery pack mode W. According to the formula, the battery pack mode W should satisfy the range of 35Hz ≤ W ≤ 60Hz. This range can be used to balance the stiffness of the battery pack and the range of the vehicle. By adjusting the number, width, and height of the crossbeams and longitudinal beams, the battery pack mode W can be controlled to meet the design requirements. That is, this embodiment can achieve a balance between the stiffness of the battery pack, the range of the vehicle, and the weight of the battery pack by reasonably designing the structure and parameters of the battery pack. This helps to improve the performance and safety of electric vehicles.

[0024] Compared with the prior art, the electrical device in this application embodiment includes the battery pack described above. This electrical device can possess all the technical features and corresponding beneficial effects of the battery pack described above, which will not be repeated here. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a simplified structural diagram of the battery pack provided in an embodiment of this application;

[0027] Figure 2 This is a schematic diagram of the overall structure of the battery pack provided in an embodiment of this application;

[0028] Figure 3 A schematic diagram of a crossbeam without a first partition provided in an embodiment of this application;

[0029] Figure 4 A schematic diagram of a crossbeam having a first partition provided for an embodiment of this application;

[0030] Figure 5 A schematic diagram of a crossbeam having two first partitions, provided for an embodiment of this application;

[0031] Figure 6 Another structural schematic diagram of the crossbeam with a first partition provided for an embodiment of this application;

[0032] Figure 7 Another structural schematic diagram of the crossbeam with two first partitions provided for embodiments of this application;

[0033] Figure 8 A schematic diagram of a longitudinal beam without a second diaphragm provided in an embodiment of this application;

[0034] Figure 9 A schematic diagram of a longitudinal beam with a second partition provided in an embodiment of this application;

[0035] Figure 10 A schematic diagram of a longitudinal beam with two second partitions provided in this application embodiment;

[0036] Figure 11 Another structural schematic diagram of the longitudinal beam with a second partition provided for an embodiment of this application;

[0037] Figure 12 Another structural schematic diagram of the longitudinal beam with two second partitions provided for embodiments of this application;

[0038] Figure label:

[0039] X - First direction; Y - Second direction; 1 - Shell; 2 - Receiving cavity; 3 - Crossbeam; 4 - First inner cavity; 5 - Longitudinal beam; 6 - Second inner cavity; 7 - Bottom plate; 8 - Side plate; 9 - Single cell; 10 - First separator; 11 - Second separator. Detailed Implementation

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only 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 those skilled in the art without making creative efforts are within the scope of protection of this application.

[0041] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified.

[0042] It should also be noted that, in the embodiments of the application, "parallel" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is -1° to 1°. Additionally, "perpendicular" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is 89° to 91°. Equal distances refer to a state in which the tolerance range is -1% to 1%.

[0043] The applicant notes that with the rise of new energy vehicles, factors such as battery pack energy density and electric vehicle platforms dictate different battery pack designs in the existing technology. When designing a battery pack, its stiffness must exceed that of the entire vehicle; otherwise, resonance will occur, posing a fire and explosion risk to the battery pack structure. Increasing the weight of the internal support structure or the number of reinforcing ribs to improve battery pack stiffness, while ensuring that the battery pack stiffness exceeds that of the entire vehicle, increases the battery pack weight, affecting lightweighting and consequently impacting the vehicle's driving range. Therefore, achieving a balanced relationship between battery pack structure, vehicle range, and battery pack stiffness has become a challenging problem that needs to be addressed.

[0044] In view of this, embodiments of this application provide a battery pack designed to balance the relationship between the vehicle's range, the battery pack's weight, and the battery pack's stiffness, thereby solving at least some of the aforementioned technical problems.

[0045] Please see Figure 1 , Figure 1 This is a simplified structural diagram of a battery pack provided in an embodiment of this application. In this embodiment, the battery pack includes a housing 1, a crossbeam 3, and a longitudinal beam 5. The housing 1 has a receiving cavity 2. The crossbeam 3 is disposed within the receiving cavity 2 along a first direction X and connected to the housing 1. The longitudinal beam 5 is disposed within the receiving cavity 2 along a second direction Y and connected to the housing 1. The first direction X and the second direction Y intersect.

[0046] It should be noted that in the accompanying drawings of the embodiments of this application, the arrow marked with X represents the first direction X, and the arrow marked with Y represents the second direction Y. The description of this application introduces the first direction X and the second direction Y to more clearly illustrate the structure and relative positional relationship of the components in the battery pack. In practical applications, the first direction X and the second direction Y can point to any direction in space. The first direction X is the length direction of the crossbeam 3, and the second direction Y is the width direction of the crossbeam 3. Optionally, the first direction X and the second direction Y are perpendicular to each other.

[0047] In the embodiments of this application, such as Figure 1 As shown, the number of crossbeams 3 is x, the width of crossbeam 3 is a2 mm, and the height of crossbeam 3 is a3 mm; the crossbeam 3 has a first inner cavity 4, which extends along a first direction X, and the number of first inner cavities 4 is a1. The number of longitudinal beams 5 is y, the width of longitudinal beam 5 is b2 mm, and the height of longitudinal beam 5 is b3 mm; the longitudinal beam 5 has a second inner cavity 6, which extends along a second direction Y, and the number of second inner cavities 6 is b1. The battery pack in this embodiment satisfies the following relationship:

[0048] 35Hz≤W≤60Hz, and W=30+(1+0.0005a1*a2*a3)x+(1.2+0.0006b1*b2*b3)y, where W is the battery pack mode, the number of crossbeams 3 x satisfies 0≤x≤6, or the number of longitudinal beams 5 y satisfies 0≤y≤6.

[0049] It is understood that this embodiment studies the correlation between the battery pack mode W and the number, width, and height of the crossbeams 3 and longitudinal beams 5. Specifically, the parameters a1, a2, a3, b1, b2, and b3 in the formula represent the number, width, and height of the crossbeams 3 and longitudinal beams 5, respectively. The coefficients 0.0005 and 0.0006 in the formula indicate the degree of influence of the dimensions of the crossbeams 3 and longitudinal beams 5 on the battery pack mode W. According to the formula, the battery pack mode W should satisfy the range of 35Hz ≤ W ≤ 60Hz. This range can be used to balance the stiffness of the battery pack and the driving range of the vehicle. By adjusting the number, width, and height of the crossbeams 3 and longitudinal beams 5, the battery pack mode W can be controlled to meet the design requirements. That is, this embodiment, through reasonable design of the battery pack structure and parameters, can achieve a balance between the battery pack stiffness, the driving range of the vehicle, and the battery pack weight. This helps to improve the performance and safety of electric vehicles.

[0050] It should be noted that the battery pack mode W can be calculated using finite element analysis (FEA) or modal analysis. These analytical methods can be used to determine the natural frequencies and vibration modes of the battery pack. In finite element analysis, the battery pack structure is discretized into many small finite elements, and then the modes are calculated by solving for the vibration eigenvalues ​​and vibration modes of the structure. These eigenvalues ​​represent the vibration modes of the structure at different frequencies. Modal analysis is a numerical method that calculates the natural frequencies and vibration modes of the structure by solving the vibration equations of the structure. This analytical method can take into account factors such as the material properties, geometry, and boundary conditions of the structure, thereby obtaining accurate modal results. When calculating the battery pack modes, factors such as the structural shape, material properties, and the number, size, and location of the supporting structures (such as the crossbeams 3 and longitudinal beams 5) need to be considered. By modeling and analyzing these parameters, the battery pack modes can be obtained. The specific calculation method for the battery pack mode W will not be elaborated in this embodiment.

[0051] In this embodiment, please refer to Figure 2 , Figure 2 This is a schematic diagram of the overall structure of the battery pack provided in an embodiment of this application. The battery pack also includes multiple individual batteries 9, which are disposed within the receiving cavity 2 and distributed on both sides of the crossbeam 3 and / or the longitudinal beam 5. Specifically, when there is only one crossbeam 3, the multiple individual batteries 9 are distributed on both sides of the crossbeam 3; when there is only one longitudinal beam 5, the multiple individual batteries 9 are distributed on both sides of the longitudinal beam 5; when there are both crossbeam 3 and longitudinal beam 5, individual batteries 9 are distributed on both sides of the crossbeam 3 and the longitudinal beam 5. That is, the receiving cavity 2 is divided into multiple regions by the crossbeam 3 and the longitudinal beam 5, and the individual batteries 9 are placed in these regions. This means that the individual batteries 9 are disposed in the space between the crossbeam 3 and the longitudinal beam 5 to maximize the use of the structural support portion of the battery pack.

[0052] It should be noted that the number of crossbeams 3 (x) satisfies 0 ≤ x ≤ 6, or the number of longitudinal beams 5 (y) satisfies 0 ≤ y ≤ 6. Specifically, x is an integer, which can be any value among 0, 1, 2, 3, 4, 5, and 6. y is an integer, which can be any value among 0, 1, 2, 3, 4, 5, and 6. x being 0 and y being 0 do not satisfy this condition simultaneously. Understandably, when only crossbeams 3 are present, the cavity 2 is divided into (x+1) regions. Each crossbeam 3 divides the space into two parts, so x crossbeams will divide the cavity 2 into (x+1) regions. When only longitudinal beams 5 are present, the cavity 2 is divided into (y+1) regions. Similarly, y longitudinal beams will divide the cavity 2 into (y+1) regions. When both crossbeams 3 and longitudinal beams 5 are present, the cavity 2 is divided into ((x+1) × (y+1)) regions. Each intersection of a crossbeam 3 and a longitudinal beam 5 forms a new region, so the total number of regions is the product of the transverse and longitudinal divisions. In other words, by allowing configurations of 0 to 6 crossbeams 3 and longitudinal beams 5, this embodiment allows designers to adjust the battery pack structure according to specific application requirements and space constraints. This flexibility enables the battery pack to adapt to different vehicle or equipment designs.

[0053] In this embodiment, the number a1 of the first inner cavities 4 satisfies 1 ≤ a1 ≤ 5. Specifically, a1 is an integer, and a1 can be any value among 1, 2, 3, 4, and 5. With other parameters unchanged, only the number of the first inner cavities 4 is changed. Increasing the number a1 of the first inner cavities 4 increases both the weight and stiffness of the crossbeam 3. This is because each additional first inner cavity 4 increases the mass and stiffness of the crossbeam 3.

[0054] It should be noted that the crossbeam 3 has multiple first inner cavities 4, and the crossbeam 3 includes a first partition 10 extending along the first direction X, with the first partition 10 spacing between two adjacent first inner cavities 4. With other parameters unchanged, only the number of first inner cavities 4 is changed; an increase in the number a1 of first inner cavities 4 increases both the weight and stiffness of the crossbeam 3. This is because each additional first inner cavity 4 adds a first partition 10, thereby increasing the mass and stiffness of the crossbeam 3. Since the stiffness of the battery pack needs to be greater than the overall vehicle stiffness, increasing the weight and stiffness of the crossbeam 3 can improve the stiffness of the battery pack, thus meeting the battery pack stiffness requirements. However, it should be noted that increasing the weight of the crossbeam 3 also increases the total weight of the battery pack, thus affecting the vehicle's lightweight design and driving range. Therefore, the above formula is used to balance the number of crossbeams 3 and the weight of the battery pack during battery pack design, in order to balance the battery pack stiffness and the vehicle's driving range.

[0055] In this embodiment, the width a2 of the crossbeam 3 satisfies 20mm ≤ a2 ≤ 30mm. Specifically, the width a2 of the crossbeam 3 can be any value or a range between any two values ​​from 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, to 30mm. It is understood that 20mm ≤ a2 ≤ 30mm means that the width a2 of the crossbeam 3 can be selected between 20mm and 30mm. When the width a2 of the crossbeam 3 increases, the weight and stiffness of the crossbeam 3 may increase. A wider crossbeam 3 can provide a larger support area, thereby increasing the stiffness of the battery pack. However, increasing the width a2 of the crossbeam 3 will also increase the mass of the crossbeam 3, which may affect the lightweighting and driving range of the entire vehicle. Therefore, the above formula is used to balance the width a2 of the crossbeam 3 and the weight of the battery pack when designing the battery pack, in order to balance the stiffness of the battery pack and the driving range of the entire vehicle.

[0056] In this embodiment, the height a3 of the crossbeam 3 satisfies 60mm ≤ a3 ≤ 80mm. Specifically, the height a3 of the crossbeam 3 can be any value or a range between any two of the following: 60mm, 61mm, 62mm, 63mm, 64mm, 65mm, 66mm, 67mm, 68mm, 69mm, 70mm, 71mm, 72mm, 73mm, 74mm, 75mm, 76mm, 77mm, 78mm, 79mm, and 80mm. It is understood that 60mm ≤ a3 ≤ 80mm means that the height a3 of the crossbeam 3 can be selected between 60mm and 80mm. When the height a3 of the crossbeam 3 increases, the weight and stiffness of the crossbeam 3 may increase. A taller crossbeam 3 can provide greater support height, thereby increasing the stiffness of the battery pack. However, increasing the height a3 of the crossbeam 3 also increases its mass, which may affect the overall vehicle's lightweight design and driving range. Therefore, the above formula is used to balance the height a3 of the crossbeam 3 and the weight of the battery pack when designing the battery pack, so as to balance the rigidity of the battery pack and the range of the whole vehicle.

[0057] In this embodiment, the number b1 of the second inner cavities 6 satisfies 1 ≤ b1 ≤ 5. Specifically, b1 is an integer, and can be any value among 1, 2, 3, 4, and 5. With other parameters unchanged, only the number of second inner cavities 6 is changed. Increasing the number b1 of the second inner cavities 6 increases both the weight and stiffness of the longitudinal beam 5. This is because each additional second inner cavity 6 increases the mass and stiffness of the longitudinal beam 5.

[0058] It should be noted that the longitudinal beam 5 has multiple second inner cavities 6, and the longitudinal beam 5 includes a second partition 11 extending along the second direction Y, with the second partition 11 spacing between two adjacent second inner cavities 6. With other parameters unchanged, only the number of second inner cavities 6 is changed; an increase in the number b1 of second inner cavities 6 increases both the weight and stiffness of the longitudinal beam 5. This is because each additional second inner cavity 6 adds a second partition 11, thus increasing the mass and stiffness of the longitudinal beam 5. Since the stiffness of the battery pack needs to be greater than the overall vehicle stiffness, increasing the weight and stiffness of the longitudinal beam 5 can improve the stiffness of the battery pack, thereby meeting the battery pack stiffness requirements. However, it should be noted that increasing the weight of the longitudinal beam 5 also increases the total weight of the battery pack, thus affecting the vehicle's lightweight design and driving range. Therefore, the above formula is used to balance the number of longitudinal beams 5 and the weight of the battery pack during battery pack design, in order to balance the battery pack stiffness and the vehicle's driving range.

[0059] In this embodiment, the width b2 of the longitudinal beam 5 satisfies 20mm ≤ b2 ≤ 30mm. Specifically, the width b2 of the longitudinal beam 5 can be any value or a range between any two of the following: 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, and 30mm. It is understood that 20mm ≤ b2 ≤ 30mm means that the width b2 of the longitudinal beam 5 can be selected between 20mm and 30mm. When the width b2 of the longitudinal beam 5 increases, the weight and stiffness of the longitudinal beam 5 may increase. A wider longitudinal beam 5 can provide a larger support area, thereby increasing the stiffness of the battery pack. However, increasing the width b2 of the longitudinal beam 5 will also increase its mass, which may affect the lightweight design and driving range of the entire vehicle. Therefore, the above formula is used to balance the width b2 of the longitudinal beam 5 and the weight of the battery pack when designing the battery pack, in order to balance the stiffness of the battery pack and the driving range of the entire vehicle.

[0060] In this embodiment, the height b3 of the longitudinal beam 5 satisfies 60mm ≤ b3 ≤ 80mm. Specifically, the height b3 of the longitudinal beam 5 can be any value or a range between any two of the following: 60mm, 61mm, 62mm, 63mm, 64mm, 65mm, 66mm, 67mm, 68mm, 69mm, 70mm, 71mm, 72mm, 73mm, 74mm, 75mm, 76mm, 77mm, 78mm, 79mm, and 80mm. It is understood that 60mm ≤ b3 ≤ 80mm means that the height b3 of the longitudinal beam 5 can be selected between 60mm and 80mm. When the height b3 of the longitudinal beam 5 increases, the weight and stiffness of the longitudinal beam 5 may increase. A taller longitudinal beam 5 can provide greater support height, thereby increasing the stiffness of the battery pack. However, increasing the height b3 of the longitudinal beam 5 will also increase its mass, which may affect the overall vehicle's lightweight design and driving range. Therefore, the above formula is used to balance the height b3 of the longitudinal beam 5 and the weight of the battery pack when designing the battery pack, so as to balance the rigidity of the battery pack and the range of the whole vehicle.

[0061] In this embodiment, the housing 1 includes a base plate 7 and a plurality of side plates 8 surrounding the base plate 7. It should be noted that the side plates 8 are arranged along the thickness direction of the base plate 7, and the side plates 8 are interconnected with the base plate 7 to form a receiving cavity 2. This structure can effectively enclose the receiving cavity 2, providing external protection and support for the battery pack. This housing structure can provide the battery pack with mechanical strength and rigidity, while protecting the battery assembly from the influence of the external environment. Furthermore, the housing 1 may also have other features, such as a top plate, connectors, etc., to provide a more complete battery pack structure.

[0062] In this embodiment, the first partition 10 is disposed parallel to the bottom plate 7, or the first partition 10 is disposed parallel to the side plate 8 and perpendicular to the second direction Y. Specifically, if the first partition 10 is disposed parallel to the bottom plate 7, then the first partition 10 will be perpendicular to each side plate 8; if the first partition 10 is disposed parallel to the side plate 8 and perpendicular to the second direction Y, then the first partition 10 will be parallel to the side plate 8 extending along the first direction X.

[0063] Understandably, please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 3 This is a schematic diagram of a crossbeam without a first partition provided in an embodiment of this application. Figure 4 This is a schematic diagram of a crossbeam with a first partition provided in an embodiment of this application. Figure 5 This is a schematic diagram of a crossbeam with two first partitions, provided as an embodiment of this application. Figure 6Another structural schematic diagram of the crossbeam with a first partition provided by an embodiment of the present application. Figure 7 Another structural schematic diagram of the crossbeam with two first partitions provided by an embodiment of the present application. In the scheme where the first partition 10 is set parallel to the bottom plate 7, when the number of the first partitions 10 is 1, the inside of the crossbeam 3 is divided into two first inner cavities 4, and the cross-section of the crossbeam 3 along the second direction Y is in the shape of a Chinese character 'Ri' (as shown in Figure 4 ), when the number of the first partitions 10 is 2, the inside of the crossbeam 3 is divided into three first inner cavities 4, and the cross-section of the crossbeam 3 along the second direction Y is in the shape of a Chinese character 'Mu' (as shown in Figure 5 ). Similarly, when the number of the first partitions 10 is 3 or 4, the number of the first inner cavities 4 gradually increases and will not be elaborated here.

[0064] In the scheme where the first partition 10 is set parallel to the side plate 8 and perpendicular to the second direction Y, when the number of the first partitions 10 is 1, the inside of the crossbeam 3 is divided into two first inner cavities 4, and the cross-section of the crossbeam 3 along the second direction Y is in the shape of an inverted Chinese character 'Ri' (as shown in Figure 6 ), when the number of the first partitions 10 is 2, the inside of the crossbeam 3 is divided into three first inner cavities 4, and the cross-section of the crossbeam 3 along the second direction Y is in the shape of an inverted Chinese character 'Mu' (as shown in Figure 7 ). Similarly, when the number of the first partitions 10 is 3 or 4, the number of the first inner cavities 4 gradually increases and will not be elaborated here.

[0065] When there is no first partition 10, there is only one first inner cavity 4 inside the crossbeam 3, and the cross-section of the crossbeam 3 along the second direction Y is in the shape of a Chinese character 'Kou' (as shown in Figure 3 ).

[0066] In this embodiment, the second partition 11 is parallel to the bottom plate 7, or the second partition 11 is parallel to the side plate 8 and perpendicular to the first direction X. Specifically, if the second partition 11 is set parallel to the bottom plate 7, then the second partition 11 will be perpendicular to each side plate 8; if the second partition 11 is set parallel to the side plate 8 and perpendicular to the first direction X, then the first partition 10 will be parallel to the side plate 8 extending along the second direction Y.

[0067] It can be understood that, please refer to Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 8 A structural schematic diagram of the longitudinal beam without the second partition provided by an embodiment of the present application. Figure 9 A structural schematic diagram of the longitudinal beam with a second partition provided by an embodiment of the present application. Figure 10 A structural schematic diagram of the longitudinal beam with two second partitions provided by an embodiment of the present application. Figure 11 Another structural schematic diagram of the longitudinal beam with a second partition provided by an embodiment of the present application Figure 12 Another structural schematic diagram of the longitudinal beam with two second partitions provided by an embodiment of the present application. In the scheme where the second partition 11 is set to be parallel to the bottom plate 7, when the number of second partitions 11 is 1, the interior of the longitudinal beam 5 is divided into two second inner cavities 6, and the cross-section of the longitudinal beam 5 along the first direction X is in the shape of a Chinese character 'ri' (as shown in Figure 8 ), when the number of second partitions 11 is 2, the interior of the longitudinal beam 5 is divided into three second inner cavities 6, and the cross-section of the longitudinal beam 5 along the first direction X is in the shape of a Chinese character'mu' (as shown in Figure 9 ). Similarly, when the number of second partitions 11 is 3 or 4, the number of second inner cavities 6 gradually increases and will not be elaborated here

[0068] In the scheme where the second partition 11 is set to be parallel to the side plate 8 and perpendicular to the first direction X, when the number of second partitions 11 is 1, the interior of the longitudinal beam 5 is divided into two second inner cavities 6, and the cross-section of the longitudinal beam 5 along the first direction X is in the shape of an inverted 'ri' (as shown in Figure 10 ), when the number of second partitions 11 is 2, the interior of the longitudinal beam 5 is divided into three second inner cavities 6, and the cross-section of the longitudinal beam 5 along the first direction X is in the shape of an inverted'mu' (as shown in Figure 11 ). Similarly, when the number of second partitions 11 is 3 or 4, the number of second inner cavities 6 gradually increases and will not be elaborated here

[0069] When there is no second partition 11, there is only one second inner cavity 6 inside the longitudinal beam 5, and the cross-section of the longitudinal beam 5 along the first direction X is in the shape of a Chinese character 'kou' (as shown in Figure 3 ).

[0070] Correspondingly, an embodiment of the present application further provides an electrical device, and the electrical device includes the above battery pack. The electrical device can be an electric vehicle / electric car (Electric Vehicle, abbreviated as EV), a hybrid electric vehicle (Hybrid Electric Vehicle, abbreviated as: HEV), a range-extended electric vehicle (Range Extended Electric Vehicle, abbreviated as REEV), a plug-in hybrid electric vehicle (Plug-in Hybrid Electric Vehicle, abbreviated as: PHEV). It can be understood that the electrical device can have all the technical features and corresponding beneficial effects of the above battery pack, which will not be elaborated here

[0071] Next, specific embodiments of the battery pack of this application are provided to describe this application in more detail through specific embodiments. As can be seen from the following embodiments, in actual implementation, when the battery pack satisfies the relationship of this application, the weight of the battery pack and the range of the whole vehicle can be in an optimal state at the same time.

[0072] Example 1: Battery pack structural design. This battery pack has 0 crossbeams 3, 0 longitudinal beams 5, and 0 first inner cavities 4. The width and height of crossbeams 3 are 0mm. The number of second inner cavities 6 is 0, and the width and height of longitudinal beams 5 are 0mm. The battery pack mode W is 30Hz. Example 1 shows the battery pack mode without crossbeams 3 and longitudinal beams 5. The battery pack stiffness is characterized by the battery pack mode. This example shows that to avoid resonance, the battery pack mode W needs to be greater than 30Hz.

[0073] Example 2: Battery pack structure design. The battery pack has 5 crossbeams 3, 5 longitudinal beams 5, 4 first inner cavities, 26mm wide and 62mm high crossbeams 3, 4 second inner cavities 6, 22mm wide and 58mm high longitudinal beams 5, and the battery pack mode W is 72.432Hz.

[0074] Example 3: Battery pack structure design. The battery pack has 0 crossbeams 3, 5 longitudinal beams 5, 0 first inner cavities 4, 0mm width and 0mm height of crossbeams 3, 1 second inner cavity 6, 24mm width and 59mm height of longitudinal beams 5, and the battery pack mode W is 40.248Hz.

[0075] Example 4: Battery pack structure design. The battery pack has 5 crossbeams 3, 0 longitudinal beams 5, 1 first inner cavity 4, 25mm wide and 62mm high crossbeams 3, 0 second inner cavities 6, 0 longitudinal beams 5, 0mm wide and 0mm high longitudinal beams 5, and the battery pack mode W is 38.875Hz.

[0076] Example 5: Battery pack structure design, the battery pack has 5 crossbeams 3, 5 longitudinal beams 5, 1 first inner cavity 4, the width of the crossbeam 3 is 20mm, the height of the crossbeam 3 is 75mm, the second inner cavity 6 has 1, the width of the longitudinal beam 5 is 25mm, the height of the longitudinal beam 5 is 62mm, and the battery pack mode W is 49.4Hz.

[0077] Example 6: Battery pack structure design, the battery pack has 2 crossbeams 3, 3 longitudinal beams 5, 4 first inner cavities, the width of the crossbeams 3 is 27mm, the height of the crossbeams 3 is 63mm, the second inner cavity has 4 6, the width of the longitudinal beams 5 is 29mm, the height of the longitudinal beams 5 is 65mm, and the battery pack mode W is 55.976Hz.

[0078] Example 7: Battery pack structure design, the battery pack has 1 crossbeam 3, 1 longitudinal beam 5, 1 first inner cavity 4, the width of the crossbeam 3 is 28mm, the height of the crossbeam 3 is 68mm, the second inner cavity 6 has 1, the width of the longitudinal beam 5 is 30mm, the height of the longitudinal beam 5 is 62mm, and the battery pack mode W is 34.268Hz.

[0079] Example 8: Battery pack structure design, the battery pack has 2 crossbeams 3, 3 longitudinal beams 4, 1 first inner cavity 4, the width of the crossbeam 3 is 25, the height of the crossbeam 3 is 74, the second inner cavity 6 has 1, the width of the longitudinal beam 5 is 28mm, the height of the longitudinal beam 5 is 75mm, and the battery pack mode W is 57.88Hz.

[0080] Example 9: Battery pack structure design. The battery pack has 6 crossbeams 3, 4 longitudinal beams 5, 2 of 4 first inner cavities, 35mm wide and 35mm high crossbeams 3, 3 of 6 second inner cavities, 40mm wide and 64mm high longitudinal beams 5, and the battery pack mode W is 66.582Hz.

[0081] Example 10: Battery pack structure design, the battery pack has 1 crossbeam 3, 6 longitudinal beams 5, 3 first inner cavities 4, the width of the crossbeam 3 is 40mm, the height of the crossbeam 3 is 40mm, the second inner cavity has 4 6, the width of the longitudinal beam 5 is 42mm, the height of the longitudinal beam 5 is 30mm, and the battery pack mode W is 58.744Hz.

[0082] Example 11: Battery pack structure design, the battery pack has 2 crossbeams 3, 1 longitudinal beam 5, 2 first inner cavities 4, the width of the crossbeam 3 is 25mm, the height of the crossbeam 3 is 60mm, the second inner cavity has 4 6, the width of the longitudinal beam 5 is 42mm, the height of the longitudinal beam 5 is 85mm, and the battery pack mode W is 44.768Hz.

[0083] Example 12: Battery pack structure design, the battery pack has 2 crossbeams 3, 1 longitudinal beam 5, 2 first inner cavities 4, the width of the crossbeam 3 is 25mm, the height of the crossbeam 3 is 85mm, the second inner cavity has 2 cavities 6, the width of the longitudinal beam 5 is 1mm, the height of the longitudinal beam 5 is 65mm, and the battery pack mode W is 37.5032Hz.

[0084] Example 13: Battery pack structure design, the battery pack has 2 crossbeams 3, 1 longitudinal beam 5, 2 first inner cavities 4, the width of the crossbeam 3 is 20mm, the height of the crossbeam 3 is 80mm, the second inner cavity has 2 6, the width of the longitudinal beam 5 is 1mm, the height of the longitudinal beam 5 is 86mm, and the battery pack mode W is 36.5032Hz.

[0085] Example 14: Battery pack structure design, the battery pack has 5 crossbeams 3, 5 longitudinal beams 5, 4 first inner cavities, crossbeams 3 with a width of 30mm and a height of 80mm, 4 second inner cavities 6, longitudinal beams 5 with a width of 30mm and a height of 80mm, the battery pack mode W is 93.8Hz.

[0086] Examples 1-14 are shown in the table below:

[0087]

[0088]

[0089] From the above embodiments, we can see that: Embodiment 1: Without crossbeams 3 and longitudinal beams 5, the battery pack mode W is 30Hz, which is just at the critical value for avoiding resonance, indicating that this design is insufficient in stiffness and cannot effectively avoid resonance. Embodiment 2: With 5 crossbeams 3 and 5 longitudinal beams 5, the mode W is 72.432Hz, showing that an appropriate number of crossbeams 3 and longitudinal beams 5 can significantly improve the mode frequency, but it may be too high, affecting the balance between weight and range. Embodiment 3: Without crossbeams 3, the mode W is 40.248Hz, showing that the lack of crossbeams 3 significantly reduces the mode frequency, but it is still within an acceptable range. Embodiment 4: Without longitudinal beams 5, the mode W is 38.875Hz, showing that the lack of longitudinal beams 5 also leads to a lower mode frequency, but it is still within an acceptable range. Embodiment 5: With 5 crossbeams 3 and 5 longitudinal beams 5, the mode W is 49.4Hz, showing that this configuration can achieve a good balance under appropriate dimensions. Example 6: Two crossbeams 3 and three longitudinal beams 5, with a modal frequency (W) of 55.976 Hz, demonstrating that with appropriate size and quantity, the modal frequency can be maintained within an ideal range. Example 9: Six crossbeams 3 and four longitudinal beams 5, with a modal frequency (W) of 66.582 Hz. Despite the large number, the unsuitable size (e.g., excessively wide crossbeams 3) resulted in an excessively high modal frequency. Examples 7, 8, 11, 12, and 13: The modal frequencies of these examples are all between 35 Hz and 60 Hz, indicating that these designs achieve a good balance between weight and range. Example 10: One crossbeam 3 and six longitudinal beams 5, with a modal frequency (W) of 58.744 Hz, showing that increasing the number of longitudinal beams 5 can compensate to some extent for insufficient crossbeams 3. Example 14: A modal frequency (W) of 93.8 Hz shows that excessively high modal frequencies may lead to design imbalance, possibly due to too many crossbeams 3 and longitudinal beams 5 and unsuitable dimensions. By comparing different embodiments, it can be seen that the appropriate number of crossbeams 3 and longitudinal beams 5, as well as a reasonable dimensional design, are key to achieving a modal frequency between 35Hz and 60Hz. This design range effectively balances the battery pack weight and the vehicle's range. In conclusion, it is proven that when the battery pack mode W satisfies 35Hz≤W≤60Hz, a balance can be achieved between the battery pack weight and the vehicle's range.

[0090] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0091] The battery pack and electrical device provided in the embodiments of this application have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and 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.

Claims

1. A battery pack, characterized in that, include: The shell has a receiving cavity; A crossbeam is disposed within the receiving cavity along a first direction and connected to the shell. The number of crossbeams is x, the width of the crossbeam is a2 mm, and the height of the crossbeam is a3 mm. The crossbeam has a first inner cavity that extends along the first direction, and the number of first inner cavities is a1. A longitudinal beam is disposed within the receiving cavity along a second direction and connected to the housing, wherein the first direction intersects the second direction, the number of longitudinal beams is y, the width of the longitudinal beam is b2 mm, and the height of the longitudinal beam is b3 mm; the longitudinal beam has a second inner cavity that extends along the second direction, and the number of second inner cavities is b1. The battery pack satisfies the following relationship: 35Hz≤W≤60Hz, and W=30+(1+0.0005a1*a2*a3)x+(1.2+0.0006b1*b2*b3)y, where W is the battery pack mode, and the number of crossbeams x satisfies 0≤x≤6, or the number of longitudinal beams y satisfies 0≤y≤6.

2. The battery pack according to claim 1, characterized in that, The number a1 of the first inner cavity satisfies 1≤a1≤5.

3. The battery pack according to claim 2, characterized in that, The width a2 of the crossbeam in the battery pack satisfies 20mm≤a2≤30mm.

4. The battery pack according to claim 3, characterized in that, The height a3 of the crossbeam satisfies 60mm≤a3≤80mm.

5. The battery pack according to claim 4, characterized in that, The number b1 of the second inner cavity of the longitudinal beam in the battery pack satisfies 1≤b1≤5.

6. The battery pack according to claim 5, characterized in that, The width b2 of the longitudinal beam satisfies 20mm≤b2≤30mm.

7. The battery pack according to claim 6, characterized in that, The height b3 of the longitudinal beam satisfies 60mm≤b3≤80mm.

8. The battery pack according to claim 1, characterized in that, The crossbeam has a plurality of the first inner cavities, and the crossbeam includes a first partition extending along the first direction, the first partition spacing two adjacent first inner cavities. The longitudinal beam has a plurality of second inner cavities, and the longitudinal beam includes a second partition extending along the second direction, the second partition spacing two adjacent second inner cavities.

9. The battery pack according to claim 8, characterized in that, The battery pack housing includes a base plate and multiple side plates surrounding the base plate; The first partition is arranged parallel to the bottom plate, or the first partition is arranged parallel to the side plate and perpendicular to the second direction; The second partition is arranged parallel to the bottom plate, or the second partition is arranged parallel to the side plate and perpendicular to the first direction.

10. An electrical appliance, characterized in that, The battery pack includes any one of claims 1 to 9.

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