Battery pack and electric equipment

Abstract

The invention belongs to the technical field of batteries, and discloses a battery pack and electric equipment.The battery pack comprises a shell, a cross beam and a longitudinal beam, the shell is provided with a containing cavity, the cross beam is arranged in the containing cavity in the first direction and connected with the shell, and the longitudinal beam is arranged in the containing cavity in the second direction and connected with the shell; the number of the cross beams is x, the width of each cross beam is a2 mm, and the height of each cross beam is a3 mm; the cross beam is provided with first inner cavities, the first inner cavities extend in the first direction X, and the number of the first inner cavities is a1. The number of the longitudinal beams is y, the width of each longitudinal beam is b2 mm, and the height of each longitudinal beam is b3 mm; the longitudinal beams are provided with second inner cavities, the second inner cavities extend in the second direction Y, and the number of the second inner cavities is b1; the battery pack meets the following relation: 35 Hz < = W < = 60 Hz, and W is a battery pack mode. The invention aims to balance the relation among the whole vehicle cruising ability, the weight of the battery pack and the rigidity of the battery pack.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a battery pack and electrical equipment. Background Art

[0002] With the rise of new energy vehicles, factors such as the energy density of the battery pack and the electric vehicle platform determine different battery pack designs. When designing a battery pack, the battery pack stiffness needs to be greater than the stiffness of the entire vehicle, otherwise resonance will occur and the battery pack structure will be at risk of fire and explosion. In order to increase the stiffness of the battery pack, the weight of the bracket inside the battery pack or the number of reinforcing ribs is increased. Although the battery pack stiffness is ensured to be greater than the stiffness of the entire vehicle, it will increase the weight of the battery pack, affect lightweighting, and thus affect the vehicle's range. Therefore, how to achieve the relationship between the battery pack structure, the vehicle's range, and the battery pack stiffness has become a difficult problem that needs to be overcome. Summary of the invention

[0003] Purpose of the invention: An embodiment of the present application provides a battery pack, aiming to balance the relationship between the vehicle's endurance, the battery pack weight and the battery pack stiffness; another purpose of an embodiment of the present application is to provide an electrical device.

[0004] Technical solution: The embodiment of the present application provides a battery pack, comprising:

[0005] A housing having a receiving cavity;

[0006] A crossbeam is arranged in the accommodating cavity along the first direction and connected to the shell, the number of the 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, the first inner cavity extends along the first direction, and the number of the first inner cavity is a1;

[0007] A longitudinal beam is arranged in the accommodating cavity along the second direction and connected to the shell, 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, the second inner cavity extends along the second direction, and the number of the 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, wherein W is the battery pack mode, the number x of the cross beams satisfies 0≤x≤6, or the number y of the longitudinal beams satisfies 0≤y≤6.

[0010] In some embodiments, the number a1 of the first inner cavities satisfies 1≤a1≤5.

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

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

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

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

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

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

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

[0018] In some embodiments, the housing of the battery pack includes a bottom plate and a plurality of side plates disposed around the bottom 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 plate is arranged parallel to the bottom plate, or the second partition plate is arranged parallel to the side plate and perpendicular to the first direction.

[0021] Correspondingly, an electrical device described in an embodiment of the present application includes the battery described in any of the above embodiments.

[0022] The embodiments of the present application have one of the following beneficial effects:

[0023] Compared with the prior art, the battery pack in this solution includes a shell, a crossbeam and a longitudinal beam. The shell has a accommodating cavity. The crossbeam is arranged in the accommodating cavity along a first direction and connected to the shell. The longitudinal beam is arranged in the accommodating cavity along a second 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, which extends along a first direction X, and the number of first inner cavities is a1. 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, which extends along a 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 crossbeam is arranged The number 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 represent the degree of influence of the size 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, which can be used to balance the stiffness of the battery pack and the endurance of the whole 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 balanced relationship between the stiffness of the battery pack, the endurance of the whole 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 electric device of the embodiment of the present application includes the above-mentioned battery pack. The electric device may have all the technical features and corresponding beneficial effects of the above-mentioned battery pack, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A schematic diagram of a simple structure of a battery pack provided in an embodiment of the present application;

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

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

[0029] Figure 4 A schematic diagram of a structure of a crossbeam with a first partition provided in an embodiment of the present application;

[0030] Figure 5 A schematic diagram of a structure of a crossbeam with two first partitions provided in an embodiment of the present application;

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

[0032] Figure 7 Another structural schematic diagram of a crossbeam with two first partitions provided in an embodiment of the present application;

[0033] Figure 8 A schematic diagram of the structure of a longitudinal beam without a second partition provided in an embodiment of the present application;

[0034] Fig. 9 A schematic diagram of a structure of a longitudinal beam with a second partition provided in an embodiment of the present application;

[0035] Fig.10 A schematic diagram of a structure of a longitudinal beam with two second partitions provided in an embodiment of the present application;

[0036] Fig.11 Another schematic diagram of the structure of the longitudinal beam with a second partition provided in an embodiment of the present application;

[0037] Fig.12 Another schematic diagram of the structure of the longitudinal beam with two second partitions provided in the embodiment of the present application;

[0038] Reference numerals:

[0039] X-first direction; Y-second direction; 1-shell; 2-accommodating 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 partition; 11-second partition. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0041] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "multiple" means two or more, and at least one means one, two or more, unless otherwise clearly and specifically defined.

[0042] It should also be noted that in the application examples, "parallel" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°. In addition, "perpendicular" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distance refers to the state where the tolerance range is -1% to 1%.

[0043] The applicant noted that in the prior art, with the rise of new energy vehicles, factors such as the energy density of the battery pack and the electric vehicle platform determine different battery pack designs. When designing a battery pack, the battery pack stiffness needs to be greater than the stiffness of the entire vehicle, otherwise resonance will occur and the battery pack structure will be at risk of fire and explosion. In order to increase the stiffness of the battery pack, the weight of the bracket inside the battery pack or the number of reinforcing ribs is increased. Although the battery pack stiffness is ensured to be greater than the stiffness of the entire vehicle, it will increase the weight of the battery pack, affect lightweighting, and thus affect the vehicle's range. Therefore, how to achieve the relationship between the battery pack structure, the vehicle's range, and the battery pack stiffness has become a difficult problem that needs to be overcome.

[0044] In view of this, an embodiment of the present application provides a battery pack, which aims to balance the relationship between the vehicle's endurance, the battery pack weight and the battery pack stiffness, so as to solve at least part of the above-mentioned technical problems.

[0045] See also Figure 1 , Figure 1 A schematic diagram of a simple structure of a battery pack provided in an embodiment of the present application. In this embodiment, the battery pack includes a shell 1, a crossbeam 3 and a longitudinal beam 5. The shell 1 has a receiving cavity 2. The crossbeam 3 is arranged in the receiving cavity 2 along a first direction X and connected to the shell 1. The longitudinal beam 5 is arranged in the receiving cavity 2 along a second direction Y and connected to the shell 1. The first direction X intersects with the second direction Y.

[0046] It should be noted that in the drawings of the embodiments of the present 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 the present application introduces the first direction X and the second direction Y in order to more clearly describe the structure and relative position 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 beam 3, and the second direction Y is the width direction of the beam 3. Optionally, the first direction X and the second direction Y are perpendicular to each other.

[0047] In the present application embodiment, Figure 1 As shown, the number of cross beams 3 is x, the width of cross beam 3 is a2 mm, and the height of cross beam 3 is a3 mm; cross beam 3 has a first inner cavity 4, the first inner cavity 4 extends along the 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; longitudinal beam 5 has a second inner cavity 6, the second inner cavity 6 extends along the second direction Y, and the number of second inner cavities 6 is b1. The battery pack of 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 x of cross beams 3 satisfies 0≤x≤6, or the number y of longitudinal beams 5 satisfies 0≤y≤6.

[0049] It can be understood that this embodiment studies the correlation between the battery pack mode W and the number, width and height of the crossbeam 3 and the longitudinal beam 5. Specifically, the parameters a1, a2, a3, b1, b2 and b3 in the formula represent the number, width and height of the crossbeam 3 and the longitudinal beam 5, respectively. The coefficients 0.0005 and 0.0006 in the formula indicate the degree of influence of the size of the crossbeam 3 and the longitudinal beam 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 endurance of the whole vehicle. By adjusting the number, width and height of the crossbeam 3 and the longitudinal beam 5, the battery pack mode W can be controlled to meet the design requirements. That is, this embodiment can achieve a balanced relationship between the stiffness of the battery pack, the endurance of the whole 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.

[0050] It should be noted that the battery pack mode W can be calculated by finite element analysis (FEA) or modal analysis. These analysis methods can be used to determine the natural frequency and vibration mode of the battery pack. In finite element analysis, the structure of the battery pack is discretized into many small finite elements, and then the mode is calculated by solving 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 frequency and vibration mode of the structure by solving the vibration equation of the structure. This analysis method can consider factors such as the material properties, geometry and boundary conditions of the structure to obtain accurate modal results. When calculating the battery pack mode, it is necessary to consider factors such as the structural shape, material properties, and the number, size and position of the supporting structure (such as beams 3 and longitudinal beams 5) of the battery pack. By modeling and analyzing these parameters, the battery pack mode can be obtained. The specific calculation method of the battery pack mode W will not be repeated in this embodiment.

[0051] In this example, see Figure 2 , Figure 2 Schematic diagram of the overall structure of the battery pack provided in the embodiment of the present application. The above-mentioned battery pack also includes a plurality of single cells 9, which are arranged in the accommodating 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, a plurality of single cells 9 are distributed on both sides of the crossbeam 3; when there is only one longitudinal beam 5, a plurality of single cells 9 are distributed on both sides of the longitudinal beam 5; when there are both crossbeam 3 and longitudinal beam 5, single cells 9 are distributed on both sides of the crossbeam 3 and the longitudinal beam 5, that is, the accommodating cavity 2 is divided into a plurality of areas by the crossbeam 3 and the longitudinal beam 5, and the single cells 9 are placed in these areas, which means that the single cells 9 are arranged in the space between the crossbeam 3 and the longitudinal beam 5 to maximize the use of the structural support part of the battery pack.

[0052] It should be noted that the number x of crossbeams 3 satisfies 0≤x≤6, or the number y of longitudinal beams 5 satisfies 0≤y≤6. Specifically, x is an integer, and x can be any value among 0, 1, 2, 3, 4, 5, and 6. y is an integer, and y can be any value among 0, 1, 2, 3, 4, 5, and 6. x is 0 and y is 0 are not satisfied at the same time. It can be understood that when there are only crossbeams 3, the accommodating cavity 2 is divided into (x+1) areas. Each crossbeam 3 divides the space into two parts, so x crossbeams will divide the accommodating cavity 2 into (x+1) areas. When there are only longitudinal beams 5, the accommodating cavity 2 is divided into (y+1) areas. Similarly, y longitudinal beams will divide the accommodating cavity 2 into (y+1) areas. When there are both crossbeams 3 and longitudinal beams 5, the accommodating cavity 2 is divided into ((x+1)×(y+1)) areas. Each intersection of a cross beam 3 and a longitudinal beam 5 forms a new area, so the total number of areas is the product of the horizontal and longitudinal divisions. That is, by allowing 0 to 6 configurations of cross beams 3 and longitudinal beams 5, the designer can adjust the structure of the battery pack according to specific application requirements and space constraints. This flexibility allows 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 of 1, 2, 3, 4, and 5. When other parameters remain unchanged and only the number of the first inner cavities 4 is changed, the weight and stiffness of the beam 3 will increase as the number a1 of the first inner cavities 4 increases. This is because each additional first inner cavity 4 will increase the mass and stiffness of the beam 3.

[0054] It should be noted that the crossbeam 3 has a plurality of first inner chambers 4, and the crossbeam 3 includes a first partition 10 extending along the first direction X, and the first partition 10 separates two adjacent first inner chambers 4. When other parameters remain unchanged and only the number of first inner chambers 4 is changed, the number a1 of the first inner chambers 4 increases, and the weight and stiffness of the crossbeam 3 will increase. This is because for each additional first inner chamber 4, a first partition 10 will be added, thereby increasing the mass and stiffness of the crossbeam 3. Since the stiffness of the battery pack needs to be greater than the stiffness of the entire vehicle, increasing the weight and stiffness of the crossbeam 3 can increase the stiffness of the battery pack, thereby meeting the stiffness requirements of the battery pack. However, it should be noted that increasing the weight of the crossbeam 3 will also increase the total weight of the battery pack, thereby affecting the lightweight and cruising range of the entire vehicle. Therefore, the above formula is used to achieve a trade-off between the number of crossbeams 3 and the weight of the battery pack when designing the battery pack, so as to balance the stiffness of the battery pack and the cruising range of the entire vehicle.

[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 of 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm or a range value between any two values. It can be 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 lightweight and cruising range of the 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 to balance the stiffness of the battery pack and the cruising range of the 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 of 60mm, 61mm, 62mm, 63mm, 64mm, 65mm, 66mm, 67mm, 68mm, 69mm, 70mm, 71mm, 72mm, 73mm, 74mm, 75mm, 76mm, 77mm, 78mm, 79mm, 80mm or a range value between any two values. It can be 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 higher crossbeam 3 can provide a greater support height, thereby increasing the stiffness of the battery pack. However, increasing the height a3 of the crossbeam 3 will also increase the mass of the crossbeam 3, which may affect the lightweight and cruising range of the vehicle. 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 stiffness of the battery pack and the endurance of the entire vehicle.

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

[0058] It should be noted that the longitudinal beam 5 has a plurality of second inner chambers 6, and the longitudinal beam 5 includes a second partition 11 extending along the second direction Y, and the second partition 11 separates two adjacent second inner chambers 6. When other parameters remain unchanged and only the number of second inner chambers 6 is changed, the number b1 of the second inner chambers 6 increases, and the weight and stiffness of the longitudinal beam 5 will increase. This is because for each additional second inner chamber 6, a second partition 11 will be added, thereby increasing the mass and stiffness of the longitudinal beam 5. Since the stiffness of the battery pack needs to be greater than the stiffness of the entire vehicle, increasing the weight and stiffness of the longitudinal beam 5 can increase the stiffness of the battery pack, thereby meeting the stiffness requirements of the battery pack. However, it should be noted that increasing the weight of the longitudinal beam 5 will also increase the total weight of the battery pack, thereby affecting the lightweight and cruising range of the entire vehicle. Therefore, the above formula is used to achieve a trade-off between the number of longitudinal beams 5 and the weight of the battery pack when designing the battery pack, so as to balance the stiffness of the battery pack and the cruising range of the entire vehicle.

[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 of 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm or a range value between any two values. It can be 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 the mass of the longitudinal beam 5, which may affect the lightweight and cruising range of the 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 to balance the stiffness of the battery pack and the cruising range of the 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 of 60mm, 61mm, 62mm, 63mm, 64mm, 65mm, 66mm, 67mm, 68mm, 69mm, 70mm, 71mm, 72mm, 73mm, 74mm, 75mm, 76mm, 77mm, 78mm, 79mm, 80mm or a range value between any two values. It can be understood that 60mm≤a3≤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 higher longitudinal beam 5 can provide a greater support height, thereby increasing the stiffness of the battery pack. However, increasing the height b3 of the longitudinal beam 5 will also increase the mass of the longitudinal beam 5, which may affect the lightweight and cruising range of the vehicle. 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 stiffness of the battery pack and the endurance of the entire vehicle.

[0061] In this embodiment, the shell 1 includes a bottom plate 7 and a plurality of side plates 8 arranged around the bottom plate 7. It should be noted that the plurality of side plates 8 are arranged along the thickness direction of the bottom plate 7, and the plurality of side plates 8 are interconnected with the bottom plate 7 to enclose a receiving cavity 2. This structure can effectively enclose the receiving cavity 2 and provide external protection and support for the battery pack. This shell structure can provide mechanical strength and rigidity to the battery pack while protecting the battery assembly from the external environment. In addition, the shell 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 arranged parallel to the bottom plate 7, or the first partition 10 is arranged parallel to the side plates 8 and perpendicular to the second direction Y. Specifically, if the first partition 10 is arranged parallel to the bottom plate 7, the first partition 10 will be perpendicular to the side plates 8; if the first partition 10 is arranged parallel to the side plates 8 and perpendicular to the second direction Y, the first partition 10 will be parallel to the side plates 8 extending along the first direction X.

[0063] Understandably, see Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 3 A schematic diagram of the structure of a crossbeam without a first partition provided in an embodiment of the present application, Figure 4 A schematic diagram of a structure of a crossbeam with a first partition provided in an embodiment of the present application, Figure 5 A schematic diagram of a structure of a crossbeam with two first partitions provided in an embodiment of the present application, Figure 6Another schematic diagram of the crossbeam with one first partition provided by the embodiment of the present application Figure 7 Another schematic diagram of the crossbeam with two first partitions provided by the 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 Figure 4 shown), 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 Figure 5 shown). 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 Figure 6 shown), 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 Figure 7 shown). 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 Figure 3 shown).

[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 、 Fig. 9 、 Fig.10 、 Fig.11 、 Fig.12 , Figure 8 A schematic diagram of the longitudinal beam without the second partition provided by the embodiment of the present application Fig. 9 A schematic diagram of the longitudinal beam with one second partition provided by the embodiment of the present application Fig.10 A schematic diagram of the longitudinal beam with two second partitions provided by the embodiment of the present application Fig.11 Another structural schematic diagram of the longitudinal beam with a second partition provided by the embodiment of the present application Fig.12 Another structural schematic diagram of the longitudinal beam with two second partitions provided by the embodiment of the present application. In the scheme where the second partition 11 is set parallel to the bottom plate 7, when the number of the second partitions 11 is 1, the inside 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 the second partitions 11 is 2, the inside 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 Fig. 9 ). Similarly, when the number of the second partitions 11 is 3 or 4, the number of the second inner cavities 6 gradually increases and will not be elaborated here.

[0068] In the scheme where the second partition 11 is set parallel to the side plate 8 and perpendicular to the first direction X, when the number of the second partitions 11 is 1, the inside 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 Chinese character 'Ri' (as shown in Fig.10 ), when the number of the second partitions 11 is 2, the inside 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 Chinese character 'Mu' (as shown in Fig.11 ). Similarly, when the number of the second partitions 11 is 3 or 4, the number of the 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, the embodiment of the present application also provides an electrical device, and the electrical device includes the above-mentioned battery pack. The electrical device can be an electric vehicle (EV), a hybrid electric vehicle (HEV), a range extended electric vehicle (REEV), or a plug-in hybrid electric vehicle (PHEV). It can be understood that the electrical device can have all the technical features and corresponding beneficial effects of the above-mentioned battery pack, which will not be elaborated here.

[0071] Next, specific embodiments of the battery pack of the present application are provided, and the present application is described in more detail through the specific embodiments. It can be seen from the following embodiments that, in actual implementation, when the battery pack satisfies the relationship of the present application, the weight of the battery pack and the endurance of the entire vehicle can be in an optimal state at the same time.

[0072] Example 1: Battery pack structure design, the number of cross beams 3 of the battery pack is 0, the number of longitudinal beams 5 is 0, the number of the first inner cavity 4 is 0, the width of the cross beam 3 is 0mm, the height of the cross beam 3 is 0mm, the number of the second inner cavity 6 is 0, the width of the longitudinal beam 5 is 0mm, the height of the longitudinal beam 5 is 0mm, and the battery pack modal W is 30Hz. Example 1 is the battery pack modal of the entire battery pack when the cross beam 3 and the longitudinal beam 5 are not set. The battery pack stiffness is characterized by the battery pack modal. It can be seen from this example that in order to avoid resonance, the battery pack modal W needs to be greater than 30Hz.

[0073] Embodiment 2: Battery pack structure design. The battery pack has 5 cross beams 3, 5 longitudinal beams 5, 4 first inner cavities, a width of 26 mm and a height of 62 mm, 4 second inner cavities, a width of 22 mm and a height of 58 mm, and the battery pack mode W is 72.432 Hz.

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

[0075] Embodiment 4: Battery pack structure design, the battery pack has 5 cross beams 3, 0 longitudinal beams 5, 1 of 4 first inner cavities, the width of cross beam 3 is 25mm, the height of cross beam 3 is 62mm, the number of 6 second inner cavities is 0, the width of longitudinal beam 5 is 0mm, the height of longitudinal beam 5 is 0mm, and the battery pack mode W is 38.875Hz.

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

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

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

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

[0080] Embodiment 9: Battery pack structure design. The battery pack has 6 cross beams 3 and 4 longitudinal beams 5. The first inner cavity has 2 of 4, the width of the cross beam 3 is 35, and the height of the cross beam 3 is 35mm. The second inner cavity has 3 of 6, the width of the longitudinal beam 5 is 40mm, and the height of the longitudinal beam 5 is 64mm. The battery pack mode W is 66.582Hz.

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

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

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

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

[0085] Embodiment 14: Battery pack structure design, the battery pack has 5 cross beams 3, 5 longitudinal beams 5, 4 first inner cavities, the width of cross beam 3 is 30mm, the height of cross beam 3 is 80mm, the second inner cavities have 6, 4 longitudinal beams 5 are 30mm wide, the height of longitudinal beam 5 is 80mm, and the battery pack mode W is 93.8Hz.

[0086] Example 1-Example 14 are as follows:

[0087]

[0088]

[0089] From the above embodiments, it can be obtained that in Embodiment 1, there is no cross beam 3 and longitudinal beam 5, and the modal W of the battery pack is 30 Hz, 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: There are 5 cross beams 3 and 5 longitudinal beams 5, and the modal W is 72.432 Hz, showing that an appropriate number of cross beams 3 and longitudinal beams 5 can significantly increase the modal frequency, but it may be too high, affecting the balance between weight and endurance. Embodiment 3: There is no cross beam 3, and the modal W is 40.248 Hz, showing that the lack of cross beam 3 will significantly reduce the modal frequency, but it is still within an acceptable range. Embodiment 4: There is no longitudinal beam 5, and the modal W is 38.875 Hz, indicating that the lack of longitudinal beam 5 will also result in a lower modal frequency, but it is still within an acceptable range. Embodiment 5: There are 5 cross beams 3 and 5 longitudinal beams 5, and the modal W is 49.4 Hz, indicating that with appropriate size, this configuration can achieve a good balance. Example 6: 2 cross beams 3 and 3 longitudinal beams 5, the modal W is 55.976 Hz, which shows that with appropriate size and number, the modal frequency can be maintained within the ideal range. Example 9: 6 cross beams 3 and 4 longitudinal beams 5, the modal W is 66.582 Hz. Although the number is large, the size is inappropriate (such as the width of the cross beam 3 is too large), resulting in a modal frequency that is too high. 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 have achieved a good balance between weight and endurance. Example 10: 1 cross beam 3 and 6 longitudinal beams 5, the modal W is 58.744 Hz, indicating that the increase in the number of longitudinal beams 5 can compensate for the insufficient number of cross beams 3 to a certain extent. Example 14: The modal W is 93.8 Hz, showing that too high a modal frequency may lead to an unbalanced design, which may be due to too many cross beams 3 and longitudinal beams 5 and inappropriate size. By comparing different embodiments, it can be seen that the appropriate number of cross beams 3 and longitudinal beams 5, as well as reasonable size design, are the key to achieving a modal frequency between 35Hz and 60Hz. The design within this range can effectively balance the weight of the battery pack and the endurance of the vehicle. In summary, it is proved that when the battery pack mode W satisfies 35Hz≤W≤60Hz, the battery pack weight and the endurance of the vehicle can be balanced.

[0090] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0091] The above is a detailed introduction to a battery pack and electrical equipment provided in the embodiments of the present application, and specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and core idea of ​​the present application; ordinary technicians in this field should understand that: they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: include: A housing having a receiving cavity; A crossbeam is arranged in the accommodating cavity along the first direction and connected to the shell, the number of the 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, the first inner cavity extends along the first direction, and the number of the first inner cavity is a1; A longitudinal beam is arranged in the accommodating cavity along the second direction and connected to the shell, wherein the first direction intersects with 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, the second inner cavity extends along the second direction, and the number of the second inner cavity 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, wherein W is the battery pack mode, the number x of the cross beams satisfies 0≤x≤6, or the number y of the longitudinal beams satisfies 0≤y≤6.

2. The battery pack according to claim 1, characterized in that: The number a1 of the first inner cavities 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 cavities 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 20 mm ≤ b2 ≤ 30 mm.

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, and the first partition partitions two adjacent first inner cavities; The longitudinal beam has a plurality of the second inner cavities, and the longitudinal beam includes a second partition extending along the second direction, wherein the second partition partitions two adjacent second inner cavities.

9. The battery pack according to claim 8, characterized in that: The battery pack housing includes a bottom plate and a plurality of side plates arranged around the bottom 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 plate is arranged parallel to the bottom plate, or the second partition plate is arranged parallel to the side plate and perpendicular to the first direction.

10. An electrical device, characterized in that: A battery pack comprising the battery pack according to any one of claims 1 to 10.

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