Battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack which comprises a box body, the battery module comprises a plurality of battery cells, the plurality of battery cells form a battery column along the longitudinal direction, and anti-explosion valves of the battery cells are arranged towards the bottom surface of the box body; the supporting longitudinal beams are connected with the bottoms of the two adjacent battery columns at the same time; the two side supports are connected with the bottoms of the two battery columns located on the edges of the two sides respectively; the plurality of middle supports are respectively connected with the bottoms of the plurality of battery columns; and an exhaust space is formed between the explosion-proof valve and the bottom surface of the box body. According to the battery pack, the supporting longitudinal beams, the side supports and the middle supports are arranged and correspond to the bottoms of the battery columns, and the edges and the middle positions of the battery columns are supported, so that the battery modules can be stably supported, the structural rigidity of the battery pack is improved, and an exhaust space can be formed between the explosion-proof valve and the bottom surface of the box body; exhausting is facilitated when the battery cell is out of control, and the safety performance of the battery pack is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack. Background Art

[0002] With increasing attention to safety and energy efficiency, battery pack safety is becoming increasingly important. With the development of new processes and technologies, battery pack structures are becoming increasingly diverse. Electric vehicles encounter a variety of complex operating conditions during operation. To enhance the battery pack's ability to cope with these conditions, its structural rigidity must be increased. The design of the battery pack structure directly impacts its overall safety performance. Utility Model Content

[0003] In view of this, the present invention provides a battery pack that can take into account both the safety performance and structural rigidity of the battery pack.

[0004] The utility model provides a battery pack, comprising: a box body; a battery module, arranged in the box body, the battery module comprising a plurality of battery cells, the plurality of battery cells forming a battery column along the longitudinal direction, the battery column being arranged in a plurality of columns along the transverse direction, and the explosion-proof valves of the battery cells being arranged toward the bottom surface of the box body; a supporting longitudinal beam, connected to the box body, at least one supporting longitudinal beam being provided, each of the supporting longitudinal beams being simultaneously connected to the bottoms of two adjacent columns of the battery column; a side support, connected to the box body, two side supports being provided, and the two side supports being respectively connected to the bottoms of two columns of the battery column located on both side edges; an intermediate support, connected to the box body, a plurality of intermediate supports being provided, and the plurality of intermediate supports being respectively connected to the bottoms of a plurality of columns of the battery column; under the supporting action of the supporting longitudinal beam, the side supports and the intermediate support, an exhaust space is formed between the explosion-proof valve and the bottom surface of the box body.

[0005] Beneficial effects: By setting supporting longitudinal beams, side supports and middle supports corresponding to the bottom of the battery column and supporting the edges and middle positions of the battery column, the battery module can be stably supported and the structural rigidity of the battery pack can be improved. An exhaust space can also be formed between the explosion-proof valve and the bottom surface of the box, which is convenient for exhausting when the battery cell loses control, thereby ensuring the safety performance of the battery pack.

[0006] In an optional embodiment, the supporting longitudinal beam includes a supporting portion and a accommodating portion, the upper surface of the supporting portion is simultaneously connected to the bottom of the two adjacent columns of the battery columns to form two supporting surfaces, the accommodating portion is connected to the supporting portion and is located between the two adjacent columns of the battery columns, and the interior of the accommodating portion forms a accommodating cavity.

[0007] Beneficial effects: The supporting part is used to support the battery column, and the accommodation part is provided. While improving the overall structural rigidity of the supporting longitudinal beam, it can accommodate components such as the copper busbar in the battery pack, thereby improving the utilization rate of the space in the battery pack, increasing the energy density of the battery pack, and protecting components such as the copper busbar, thereby preventing the high temperature environment in the box from damaging the copper busbar and other components.

[0008] In an optional embodiment, the supporting portion includes a first enclosing plate, a second enclosing plate and reinforcing ribs, and two of the first enclosing plates and two of the second enclosing plates are provided, the two first enclosing plates are arranged relative to each other, and the two second enclosing plates are arranged relative to each other, and the two first enclosing plates and the two second enclosing plates enclose each other to form a rectangular structure with a cavity, the supporting surface is provided corresponding to the first enclosing plate, and the reinforcing ribs are provided in the cavity and are simultaneously connected to the two first enclosing plates.

[0009] Beneficial effects: A rectangular structure with a cavity is formed by enclosing the first enclosing plate and the second enclosing plate, and the overall rigidity of the rectangular structure is improved by setting reinforcing ribs, thereby ensuring the stability of the battery module support and the rigidity performance of the battery pack, while making the overall weight of the supporting part lighter, thereby reducing the weight of the battery pack.

[0010] In an optional embodiment, the reinforcing rib includes a first inclined section and a second inclined section, two second inclined sections are provided, the two second inclined sections are respectively connected to the two ends of the first inclined section, and the two second inclined sections are respectively connected to the two first enclosing panels, the angle between the first inclined section and the first enclosing panel is a, and the angle between the second inclined section and the first enclosing panel is b, satisfying 30°<a<60°, 15°<b<30°; and / or,

[0011] The width of the battery cell in the longitudinal direction is x, and each supporting surface is provided with two reinforcing ribs. In the transverse direction, the distance between the upper ends of the two reinforcing ribs is d, and the distance between the lower ends of the two reinforcing ribs is e, satisfying 1.2x<d<2x, 2.5x<e<3.5x; and / or,

[0012] The width of the battery cell in the longitudinal direction is x, the height of the second enclosing plate is f, and 0.5x<f<x is satisfied; and / or,

[0013] In the transverse direction, the length of the battery cell is y, and the length of the first enclosure plate is g, satisfying 0.25y<g<0.35y.

[0014] Beneficial effect: By setting the reinforcing ribs at an angle, the vertical force on the battery cells is avoided at the reinforcing ribs, thereby stably supporting the battery cells while reducing damage to the battery cells and protecting the battery cells.

[0015] Make 1.2x<d<2x, 2.5x<e<3.5x, to ensure that the two reinforcing ribs on one supporting surface can be arranged reasonably, while improving the support strength of the supporting surface, ensuring that the battery cell is subjected to reasonable force and reducing the deformation of the battery cell;

[0016] 0.5x<f<x, while ensuring that the exhaust space has an appropriate height for smooth exhaust, avoids wasting space in the battery pack and improves the energy density of the battery pack;

[0017] 0.25y<g<0.35y, while ensuring stable support for the battery cell, avoids interference between the first enclosing plate and the explosion-proof valve, and avoids the first enclosing plate blocking the explosion-proof valve and affecting the normal exhaust of the battery cell.

[0018] In an optional embodiment, the accommodating portion includes a third enclosing plate and a fourth enclosing plate, two third enclosing plates are arranged with relative intervals in the horizontal direction, the lower ends of the two third enclosing plates are connected to the upper surface of the first enclosing plate, and the fourth enclosing plate is connected to the upper ends of the two third enclosing plates, and the two third enclosing plates, the fourth enclosing plate and the upper surface of the first enclosing plate enclose to form the accommodating cavity.

[0019] In an optional embodiment, the height of the battery cell is z, the height of the third enclosing plate is i, and 0.45z<i<0.85z is satisfied; and / or,

[0020] The width of the battery cell in the longitudinal direction is x, and the distance between the two third enclosing plates in the transverse direction is w, which satisfies 1.2x<w<2.5x; and / or,

[0021] The height of the battery cell is z, and the accommodating portion further includes a partition plate, which is arranged in the accommodating cavity and simultaneously connected to the two third enclosing plates to divide the accommodating cavity into several sub-cavities, and the height of the sub-cavity is j, satisfying 0.25z<j<0.45z.

[0022] Beneficial effect: 0.45z<i<0.85z, while ensuring a sufficient volume of the accommodating cavity, avoiding material waste;

[0023] 1.2x<w<2.5x, while ensuring a sufficient volume of the accommodation cavity, avoid wasting space in the battery pack and improve the energy density of the battery pack;

[0024] By making 0.25z<j<0.45z, the accommodating cavity can be divided into several sub-cavities with reasonable volumes along the height direction. Different sub-cavities can realize different functions. They can not only accommodate components such as copper busbars, but also serve as exhaust channels for the entire battery pack to discharge the gas in the battery pack into the external environment.

[0025] In an optional embodiment, the intermediate support includes a first support plate and a second support plate, wherein two first support plates are arranged at opposite intervals in the transverse direction, the lower ends of the two first support plates are in contact with the bottom surface of the box, and the second support plate connects the upper ends of the two first support plates, and the upper surface of the second support plate is in contact with the bottom of the battery array; or,

[0026] The intermediate support includes a first support plate, a second support plate and a wing plate, two first support plates are arranged with relative intervals in the horizontal direction, and the lower ends of the two first support plates are both in contact with the bottom surface of the box body, two wing plates are provided, the first ends of the two wing plates are respectively connected to the lower ends of the two first support plates, and the second ends of the two wing plates are extended in directions away from each other, and the wing plates are in contact with the bottom surface of the box body, and the second support plate is connected to the upper ends of the two first support plates, and the upper surface of the second support plate is connected to the bottom of the battery column.

[0027] Beneficial effects: The middle support is set to a U-shaped or an X-shaped structure, which has a simple structure, is easy to form, and is light in weight.

[0028] In an optional embodiment, in the transverse direction, the length of the battery cell is y, the distance between the two first support plates is B, and 0.2y<B<0.35y is satisfied; and / or,

[0029] The height of the exhaust space is h, the height of the first support plate is H, and 0.35h<H<0.55h is satisfied; and / or,

[0030] The width of the battery cell in the longitudinal direction is x, and the width of the wing plate in the transverse direction is k, satisfying x<k<1.5x.

[0031] Beneficial effect: 0.2y<B<0.35y, while ensuring stable support for the battery cell, avoiding interference between the second support plate and the explosion-proof valve, and preventing the second support plate from blocking the explosion-proof valve and affecting the normal exhaust of the battery cell;

[0032] Make 0.35h<H<0.55h, while ensuring that the exhaust space has an appropriate height for smooth exhaust, avoid wasting space in the battery pack and improve the energy density of the battery pack;

[0033] By making x<k<1.5x, the structural rigidity of the intermediate support is improved while avoiding waste of materials.

[0034] In an optional embodiment, the box body includes a main body, a cold plate structure and a bottom guard plate. Openings are set at both ends of the main body. The cold plate structure and the bottom guard plate respectively block the two openings and are connected to the main body to enclose a storage space for the battery module. The supporting longitudinal beam, the side support and the middle support are all connected to the main body. The side of the bottom guard plate facing the storage space forms the bottom surface of the box body.

[0035] Beneficial effects: The cold plate structure is used as part of the floor of the vehicle body, the overall structure is compact, and the explosion-proof valve is set towards the bottom guard plate, avoiding the impact of the explosion-proof valve exhaust on the safety of the entire vehicle.

[0036] In an optional embodiment, the cold plate structure includes a cold plate body and a sealing cover, the cold plate body is bonded to the upper surface of the battery module, the sealing cover corresponds to the edge of the cold plate body and is arranged along the circumference of the cold plate body, and the sealing cover is connected to the main body; or,

[0037] The cold plate structure includes a cold plate body and a sealing cover, wherein the sealing cover corresponds to the edge of the cold plate body and is arranged along the circumference of the cold plate body, and the sealing cover, the edge of the cold plate body and the main body are connected; or,

[0038] The cold plate structure includes a cold plate body and a sealing cover, wherein the lower surface of the cold plate body is connected to the upper surface of the battery module, the sealing cover covers the upper surface of the cold plate body, and the edge of the sealing cover, the edge of the cold plate body and the main body are connected; and / or,

[0039] Buffering members are provided between the supporting longitudinal beam and the bottom guard plate, between the side support and the bottom guard plate, and between the middle support and the bottom guard plate.

[0040] Beneficial effects: The sealing cover is used to effectively seal the edge of the cold plate body, and the cold plate body is directly bonded to the battery module, and the sealing cover is connected to the main body. The edge of the sealing cover and the edge of the cold plate body do not need to be connected, which simplifies the overall structure of the cold plate body, effectively reduces the weight of the battery pack, and can improve the energy density of the battery pack;

[0041] The sealing cover is used to effectively seal the edge of the cold plate body, and the sealing cover, the edge of the cold plate body and the main body are connected and arranged at the same time, thereby improving the firmness of the cold plate body;

[0042] The upper surface of the cold plate body is covered with a sealing cover to improve the sealing effect of the cold plate body and effectively improve the overall rigidity of the cold plate structure;

[0043] By setting up buffer parts, the rigid force transmission between the bottom guard plate and the supporting longitudinal beam, side support and middle support can be avoided, the impact force on the battery cell can be reduced, and the battery cell damage can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0045] Figure 1 This is a schematic diagram of the exploded structure of a battery pack according to an embodiment of the present invention;

[0046] Figure 2 for Figure 1 A top view of the battery pack shown;

[0047] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure in the AA direction;

[0048] Figure 4 for Figure 3 Schematic diagram of the structure of the middle supporting longitudinal beam;

[0049] Figure 5 for Figure 4 Dimensioned schematic diagram of the supporting longitudinal beam shown;

[0050] Figure 6 for Figure 3 Schematic diagram of the structure of the middle support;

[0051] Figure 7 A top view of another intermediate support according to an embodiment of the present utility model;

[0052] Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0053] Figure 9 This is a schematic diagram of the exploded structure of the first embodiment of the cold plate structure of the present utility model;

[0054] Figure 10 This is a schematic diagram of the exploded structure of the second embodiment of the cold plate structure of the present utility model;

[0055] Figure 11 This is a schematic diagram of the exploded structure of the third embodiment of the cold plate structure of the present utility model.

[0056] Description of reference numerals:

[0057] 1. Box body; 11. Main body; 12. Cold plate structure; 121. Cold plate body; 122. Sealing cover; 13. Bottom guard plate; 2. Battery module; 3. Support longitudinal beam; 31. Support part; 311. First enclosing plate; 312. Second enclosing plate; 313. Reinforcement rib; 3131. First inclined section; 3132. Second inclined section; 32. Accommodation part; 321. Third enclosing plate; 322. Fourth enclosing plate; 323. Partition plate; 4. Side support; 5. Middle support; 51. First support plate; 52. Second support plate; 53. Wing plate. DETAILED DESCRIPTION

[0058] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0059] The following combination Figures 1 to 11 , describing the embodiments of the present utility model.

[0060] According to an embodiment of the present invention, a battery pack is provided, comprising: a housing 1; a battery module 2 disposed within the housing 1, the battery module 2 comprising a plurality of battery cells, the plurality of battery cells forming a battery row along the longitudinal direction, the battery row being arranged in a plurality of rows along the transverse direction, and the explosion-proof valves of the battery cells being disposed toward the bottom surface of the housing 1; a supporting longitudinal beam 3 connected to the housing 1, at least one supporting longitudinal beam 3 being provided, each supporting longitudinal beam 3 being simultaneously connected to the bottoms of two adjacent battery rows; a side support 4 connected to the housing 1, two side supports 4 being provided, each of the two side supports 4 being respectively connected to the bottoms of two battery rows located at the two side edges; and an intermediate support 5 connected to the housing 1, a plurality of intermediate supports 5 being provided, each of the intermediate supports 5 being respectively connected to the bottoms of the plurality of battery rows. Under the support of the supporting longitudinal beam 3, the side supports 4, and the intermediate supports 5, an exhaust space is formed between the explosion-proof valve and the bottom surface of the housing 1.

[0061] By providing supporting longitudinal beams 3, side supports 4 and middle supports 5 corresponding to the bottom of the battery array and supporting the edges and middle positions of the battery array, the battery module 2 can be stably supported, and the structural rigidity of the battery pack can be improved. An exhaust space can also be formed between the explosion-proof valve and the bottom surface of the box body 1, which is convenient for exhausting when the battery cell loses control, thereby ensuring the safety performance of the battery pack.

[0062] It is worth noting that, please refer to Figure 3 The battery module 2 includes two rows of cells, one supporting longitudinal beam 3, two side supports 4, and two intermediate supports 5. The supporting longitudinal beam 3 supports the right edge of the left row of cells and the left edge of the right row of cells. The side support 4 on the left supports the left edge of the left row of cells, while the side support 4 on the right supports the right edge of the right row of cells. The intermediate support 5 on the left supports the center of the left row of cells, while the intermediate support 5 on the right supports the center of the right row of cells.

[0063] Of course, in other alternative embodiments, the battery module 2 may include more battery columns, such as three columns, four columns, etc. Accordingly, the number of supporting longitudinal beams 3 and intermediate supports 5 can be adapted to the number of battery columns.

[0064] It is worth noting that, please refer to Figure 1 The supporting longitudinal beam 3, the side support 4 and the middle support 5 are all arranged to extend in the longitudinal direction.

[0065] In one embodiment, Figure 4 As shown, the supporting longitudinal beam 3 includes a supporting portion 31 and a receiving portion 32. The upper surface of the supporting portion 31 is connected to the bottoms of two adjacent battery columns to form two supporting surfaces. The receiving portion 32 is connected to the supporting portion 31 and is located between the two adjacent battery columns. The interior of the receiving portion 32 forms a receiving cavity.

[0066] The supporting portion 31 is used to support the battery array, and the accommodating portion 32 is provided to improve the overall structural rigidity of the supporting longitudinal beam 3 while being able to accommodate components such as the copper busbar in the battery pack, thereby improving the utilization rate of the space in the battery pack, increasing the energy density of the battery pack, and protecting components such as the copper busbar, thereby preventing the high temperature environment in the box 1 from causing damage to the copper busbar and other components.

[0067] It is worth noting that, please refer to Figure 4 The supporting longitudinal beam 3 forms a T-shaped structure through the supporting portion 31 and the accommodating portion 32.

[0068] It should be noted that, in the transverse direction, the accommodating portion 32 is located between the two supporting surfaces.

[0069] In one embodiment, Figure 4 As shown, the supporting portion 31 includes a first enclosing plate 311, a second enclosing plate 312 and a reinforcing rib 313. Two of the first enclosing plates 311 and the second enclosing plates 312 are provided. The two first enclosing plates 311 are arranged relatively spaced apart, and the two second enclosing plates 312 are arranged relatively spaced apart. The two first enclosing plates 311 and the two second enclosing plates 312 are enclosed to form a rectangular structure with a cavity. The supporting surface is provided corresponding to the first enclosing plate 311, and the reinforcing rib 313 is provided in the cavity and is connected to the two first enclosing plates 311 at the same time.

[0070] A rectangular structure with a cavity is formed by enclosing the first enclosing plate 311 and the second enclosing plate 312, and the overall rigidity of the rectangular structure is improved by providing reinforcing ribs 313, thereby ensuring the stability of the support for the battery module 2 and the rigidity performance of the battery pack, while making the overall weight of the supporting portion 31 lighter, thereby reducing the weight of the battery pack.

[0071] In one embodiment, Figure 4 and Figure 5 As shown, the reinforcing rib 313 includes a first inclined section 3131 and a second inclined section 3132. There are two second inclined sections 3132, each connected to the two ends of the first inclined section 3131. The two second inclined sections 3132 are respectively connected to the two first enclosure panels 311. The angle between the first inclined section 3131 and the first enclosure panel 311 is a, and the angle between the second inclined section 3132 and the first enclosure panel 311 is b, satisfying 30°<a<60°, and 15°<b<30°. By tilting the reinforcing rib 313, the vertical force on the battery cell at the reinforcing rib 313 is avoided, thereby stably supporting the battery cell while reducing damage to the battery cell and achieving protection for the battery cell.

[0072] It is worth noting that if the reinforcing ribs 313 are arranged perpendicular to the first enclosure plate 311, when the battery cells are arranged corresponding to the reinforcing ribs 313, the force transmitted from the box 1 to the supporting portion 31 will be applied to the battery cells in a straight direction through the reinforcing ribs 313, resulting in greater force on the battery cells, which can easily cause damage and deformation. In this embodiment, the reinforcing ribs 313 are arranged at an angle and are configured as a first inclined section 3131 and two second inclined sections 3132. The force of the reinforcing ribs 313 is decomposed before being applied to the battery cells, reducing the force on the battery cells and preventing damage and deformation.

[0073] In one embodiment, Figure 4 and Figure 5As shown, the width of the battery cell in the longitudinal direction is x, and two reinforcing ribs 313 are provided on each supporting surface. In the transverse direction, the distance between the upper ends of the two reinforcing ribs 313 is d, and the distance between the lower ends of the two reinforcing ribs 313 is e, satisfying 1.2x < d < 2x, and 2.5x < e < 3.5x. The conditions of 1.2x < d < 2x and 2.5x < e < 3.5x ensure that the two reinforcing ribs 313 on a supporting surface are properly arranged. This not only improves the support strength of the supporting surface, but also ensures that the battery cell is properly stressed and reduces deformation of the battery cell.

[0074] It is worth noting that, please refer to Figure 4 For the two reinforcing ribs 313 corresponding to one supporting surface, the two reinforcing ribs 313 are arranged in an eight-shaped shape.

[0075] In one embodiment, Figure 4 and Figure 5 As shown, the width of the battery cell in the longitudinal direction is x, and the height of the second enclosing plate 312 is f, satisfying 0.5x<f<x. Ensuring 0.5x<f<x ensures that the exhaust space has an appropriate height for smooth exhaust while avoiding wasting space within the battery pack and improving the energy density of the battery pack.

[0076] It is worth noting that the height of the second enclosing plate 312 is the same as the height of the supporting portion 31 .

[0077] In one embodiment, Figure 4 and Figure 5 As shown, in the horizontal direction, the length of the battery cell is y, and the length of the first enclosing plate 311 is g, satisfying 0.25y<g<0.35y. Ensuring 0.25y<g<0.35y ensures stable support for the battery cell while preventing interference between the first enclosing plate 311 and the explosion-proof valve, preventing the first enclosing plate 311 from blocking the explosion-proof valve and affecting the normal exhaust of the battery cell.

[0078] In one embodiment, Figure 4 As shown, the accommodating portion 32 includes a third enclosing plate 321 and a fourth enclosing plate 322. Two third enclosing plates 321 are arranged with relative spacing along the horizontal direction. The lower ends of the two third enclosing plates 321 are connected to the upper surface of the first enclosing plate 311. The fourth enclosing plate 322 connects the upper ends of the two third enclosing plates 321. The two third enclosing plates 321, the fourth enclosing plate 322 and the upper surface of the first enclosing plate 311 enclose to form an accommodating cavity.

[0079] In one embodiment, Figure 4 and Figure 5As shown, the height of the battery cell is z, and the height of the third enclosing plate 321 is i, which satisfies 0.45z<i<0.85z. 0.45z<i<0.85z ensures a sufficient volume of the accommodation cavity while avoiding material waste.

[0080] It is worth noting that the height of the third enclosing plate 321 is the same as the height of the accommodating portion 32 .

[0081] In one embodiment, Figure 4 and Figure 5 As shown, the width of the battery cell in the longitudinal direction is x, and the distance between the two third enclosing plates 321 in the transverse direction is w, satisfying 1.2x<w<2.5x. Ensuring 1.2x<w<2.5x ensures a sufficient volume for the receiving cavity while avoiding wasting space in the battery pack and improving the energy density of the battery pack.

[0082] It is worth noting that the distance between the two third enclosing panels 321 is the width of the fourth enclosing panel 322 in the horizontal direction.

[0083] In one embodiment, Figure 4 and Figure 5 As shown, the height of the battery cell is z. The accommodating portion 32 further includes a partition plate 323, which is disposed within the accommodating cavity and simultaneously connected to the two third enclosing plates 321 to divide the accommodating cavity into a plurality of sub-cavities. The height of each sub-cavity is j, and 0.25z < j < 0.45z is satisfied. Ensuring 0.25z < j < 0.45z allows the accommodating cavity to be divided into a plurality of sub-cavities of reasonable volume along the height direction. Different sub-cavities can perform different functions, not only accommodating components such as copper busbars, but also serving as exhaust channels for the entire battery pack, discharging gases within the battery pack to the external environment.

[0084] In one embodiment, Figure 6 As shown, the middle support 5 includes a first support plate 51 and a second support plate 52. Two first support plates 51 are arranged at opposite intervals in the horizontal direction. The lower ends of the two first support plates 51 are both in contact with the bottom surface of the box body 1. The second support plate 52 connects the upper ends of the two first support plates 51, and the upper surface of the second support plate 52 is in contact with the bottom of the battery column.

[0085] As an alternative embodiment, Figure 7 and Figure 8As shown, the middle support 5 includes a first support plate 51, a second support plate 52 and a wing plate 53. Two first support plates 51 are arranged with relative intervals in the horizontal direction, and the lower ends of the two first support plates 51 are both in contact with the bottom surface of the box body 1. Two wing plates 53 are provided, and the first ends of the two wing plates 53 are respectively connected to the lower ends of the two first support plates 51, and the second ends of the two wing plates 53 are extended in directions away from each other, and the wing plates 53 are in contact with the bottom surface of the box body 1. The second support plate 52 is connected to the upper ends of the two first support plates 51, and the upper surface of the second support plate 52 is connected to the bottom of the battery column.

[0086] It is worth noting that the middle support 5 is configured as a U-shaped or an X-shaped structure, which has a simple structure, is easy to form, and is light in weight.

[0087] In one embodiment, Figure 6 As shown, in the horizontal direction, the length of the battery cell is y, and the distance between the two first support plates 51 is B, which satisfies 0.2y<B<0.35y. Ensuring 0.2y<B<0.35y ensures stable support for the battery cell while preventing interference between the second support plates 52 and the explosion-proof valve, preventing the second support plates 52 from blocking the explosion-proof valve and affecting normal exhaust of the battery cell.

[0088] In one embodiment, Figure 6 As shown, the height of the exhaust space is h, and the height of the first support plate 51 is H, satisfying 0.35h<H<0.55h. Setting 0.35h<H<0.55h ensures that the exhaust space has an appropriate height for smooth exhaust while avoiding wasting space in the battery pack and improving the energy density of the battery pack.

[0089] In an alternative embodiment, as Figure 8 As shown, the width of the battery cell in the longitudinal direction is x, and the width of the wing plate 53 in the transverse direction is k, satisfying x<k<1.5x. Setting x<k<1.5x improves the structural rigidity of the intermediate support 5 while avoiding material waste.

[0090] In one embodiment, Figure 1 and Figure 3 As shown, the box body 1 includes a main body 11, a cold plate structure 12, and a bottom guard plate 13. The main body 11 is open at both ends. The cold plate structure 12 and the bottom guard plate 13 respectively block the two openings and are connected to the main body 11 to enclose a space for the battery module 2. The supporting longitudinal beams 3, side supports 4, and intermediate supports 5 are all connected to the main body 11. The side of the bottom guard plate 13 facing the storage space forms the bottom surface of the box body 1. The cold plate structure 12 is used as part of the vehicle body floor, making the overall structure compact. The explosion-proof valve is also positioned toward the bottom guard plate 13 to prevent exhaust from the explosion-proof valve from affecting the safety of the entire vehicle.

[0091] It is worth noting that the supporting longitudinal beams 3, side supports 4 and intermediate supports 5 are all welded to the main body 11. Furthermore, the main body 11 includes side beams, and the inner side of the side beams is provided with wing structures extending inwardly, which serve as side supports 4.

[0092] In one embodiment, buffers are provided between the supporting longitudinal beam 3 and the bottom guard plate 13, between the side supports 4 and the bottom guard plate 13, and between the middle support 5 and the bottom guard plate 13. The provision of the buffers prevents the transmission of rigid forces between the bottom guard plate 13 and the supporting longitudinal beam 3, the side supports 4, and the middle support 5, thereby reducing the impact force on the battery cells and preventing damage to the battery cells.

[0093] It is worth noting that the buffer member and the cavity supporting the longitudinal beam 3 can absorb 35% to 55% of the extrusion force transmitted from the bottom guard plate 13 .

[0094] In a first embodiment, if Figure 9 As shown, the cold plate structure 12 includes a cold plate body 121 and a sealing cover 122. The cold plate body 121 is bonded to the upper surface of the battery module 2. The sealing cover 122 corresponds to the edge of the cold plate body 121 and is arranged along the circumference of the cold plate body 121. The sealing cover 122 is connected to the main body 11. The sealing cover 122 effectively seals the edge of the cold plate body 121. The cold plate body 121 is directly bonded to the battery module 2, and the sealing cover 122 is connected to the main body 11. The edge of the sealing cover 122 does not need to be connected to the edge of the cold plate body 121. This simplifies the overall structure of the cold plate body 121, effectively reduces the weight of the battery pack, and can improve the energy density of the battery pack.

[0095] In a second embodiment, if Figure 10 As shown, the cold plate structure 12 includes a cold plate body 121 and a sealing cover 122. The sealing cover 122 corresponds to the edge of the cold plate body 121 and is arranged along the circumference of the cold plate body 121. The sealing cover 122, the edge of the cold plate body 121, and the main body 11 are connected. The sealing cover 122 effectively seals the edge of the cold plate body 121. Moreover, the sealing cover 122, the edge of the cold plate body 121, and the main body 11 are connected at the same time to improve the secure fixation of the cold plate body 121.

[0096] In a third embodiment, as Figure 11 As shown, the cold plate structure 12 includes a cold plate body 121 and a sealing cover 122. The lower surface of the cold plate body 121 is connected to the upper surface of the battery module 2, and the sealing cover 122 covers the upper surface of the cold plate body 121. The edge of the sealing cover 122, the edge of the cold plate body 121, and the main body 11 are connected. The sealing cover 122 covers the upper surface of the cold plate body 121, improving the sealing effect of the cold plate body 121 and effectively increasing the overall rigidity of the cold plate structure 12.

[0097] It is worth noting that the arrangement of the cold plate structure 12 in the battery pack can be selected and adjusted in the above three embodiments according to the size and design requirements of the battery pack, so as to improve the adaptability of the cold plate structure 12 .

[0098] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A battery pack, characterized in that: include: Box; A battery module is arranged in the box, the battery module includes a plurality of battery cells, the plurality of battery cells form a battery row along the longitudinal direction, the battery row is arranged in a plurality of rows along the transverse direction, and the explosion-proof valve of the battery cell is arranged toward the bottom surface of the box; A supporting longitudinal beam connected to the box body, wherein at least one supporting longitudinal beam is provided, and each supporting longitudinal beam is connected to the bottom of two adjacent battery columns at the same time; A side support connected to the box body, wherein two side supports are provided, and the two side supports are respectively connected to the bottoms of the two battery columns located at the two side edges; An intermediate support is connected to the box body, and a plurality of the intermediate supports are provided, and the plurality of the intermediate supports are respectively connected to the bottoms of a plurality of battery columns; under the support of the supporting longitudinal beam, the side support and the intermediate support, an exhaust space is formed between the explosion-proof valve and the bottom surface of the box body.

2. The battery pack according to claim 1, characterized in that: The supporting longitudinal beam includes a supporting portion and a receiving portion. The upper surface of the supporting portion is connected to the bottoms of two adjacent columns of the battery columns to form two supporting surfaces. The receiving portion is connected to the supporting portion and is located between the two adjacent columns of the battery columns. A receiving cavity is formed inside the receiving portion.

3. The battery pack according to claim 2, characterized in that: The supporting part includes a first enclosing plate, a second enclosing plate and reinforcing ribs. Two of the first enclosing plates and two of the second enclosing plates are provided. The two first enclosing plates are arranged relatively and spaced apart from each other, and the two second enclosing plates are arranged relatively and spaced apart from each other. The two first enclosing plates and the two second enclosing plates enclose each other to form a rectangular structure with a cavity. The supporting surface is provided corresponding to the first enclosing plate, and the reinforcing ribs are provided in the cavity and are connected to the two first enclosing plates at the same time.

4. The battery pack according to claim 3, characterized in that: The reinforcing rib comprises a first inclined section and a second inclined section, two second inclined sections are provided, the two second inclined sections are respectively connected to two ends of the first inclined section, the two second inclined sections are respectively connected to two first enclosing plates, the angle between the first inclined section and the first enclosing plate is a, the angle between the second inclined section and the first enclosing plate is b, and 30°<a<60°, 15°<b<30° is satisfied; and / or, The width of the battery cell in the longitudinal direction is x, and each supporting surface is provided with two reinforcing ribs, and in the transverse direction, the distance between the upper ends of the two reinforcing ribs is d, and the distance between the lower ends of the two reinforcing ribs is e, satisfying 1.2x<d<2x, 2.5x<e<3.5x; and / or, The width of the battery cell in the longitudinal direction is x, and the height of the second enclosure plate is f, satisfying 0.5x<f<x; and / or, In the horizontal direction, the length of the battery cell is y, and the length of the first enclosure plate is g, satisfying 0.25y<g<0.35y.

5. The battery pack according to claim 3, characterized in that: The accommodating portion includes a third enclosing plate and a fourth enclosing plate, wherein two third enclosing plates are arranged with relative spacing in the lateral direction, the lower ends of the two third enclosing plates are connected to the upper surface of the first enclosing plate, and the fourth enclosing plate connects the upper ends of the two third enclosing plates, and the two third enclosing plates, the fourth enclosing plate and the upper surface of the first enclosing plate enclose to form the accommodating cavity.

6. The battery pack according to claim 5, characterized in that: The height of the battery cell is z, the height of the third enclosure plate is i, and 0.45z<i<0.85z is satisfied; and / or, The width of the battery cell in the longitudinal direction is x, and the distance between the two third enclosure plates in the transverse direction is w, satisfying 1.2x<w<2.5x; and / or, The height of the battery cell is z, and the accommodating portion further includes a partition plate, which is arranged in the accommodating cavity and simultaneously connected to the two third enclosing plates to divide the accommodating cavity into a plurality of sub-cavities, and the height of the sub-cavity is j, satisfying 0.25z<j<0.45z.

7. The battery pack according to any one of claims 1 to 6, characterized in that: The intermediate support includes a first support plate and a second support plate, wherein two first support plates are arranged at an interval in the transverse direction, the lower ends of the two first support plates are in contact with the bottom surface of the box body, the second support plate connects the upper ends of the two first support plates, and the upper surface of the second support plate is in contact with the bottom of the battery array; or, The intermediate support includes a first support plate, a second support plate and a wing plate, wherein two first support plates are arranged with relative spacing in the transverse direction, and the lower ends of the two first support plates are both abutted against the bottom surface of the box body, and two wing plates are arranged, and the first ends of the two wing plates are respectively connected to the lower ends of the two first support plates, and the second ends of the two wing plates are extended in directions away from each other, and the wing plates are abutted against the bottom surface of the box body, and the second support plate connects the upper ends of the two first support plates, and the upper surface of the second support plate is connected to the bottom of the battery column.

8. The battery pack according to claim 7, characterized in that: In the horizontal direction, the length of the battery cell is y, the distance between the two first support plates is B, and 0.2y<B<0.35y is satisfied; and / or, The height of the exhaust space is h, the height of the first support plate is H, and 0.35h<H<0.55h is satisfied; and / or, The width of the battery cell in the longitudinal direction is x, and the width of the wing plate in the transverse direction is k, satisfying x<k<1.5x.

9. The battery pack according to any one of claims 1 to 6, characterized in that: The box body includes a main body, a cold plate structure and a bottom guard plate. The main body is provided with openings at both ends. The cold plate structure and the bottom guard plate respectively block the two openings and are connected to the main body to enclose a storage space for the battery module. The supporting longitudinal beam, the side support and the middle support are all connected to the main body. The bottom surface of the box body is formed by the side of the bottom guard plate facing the storage space.

10. The battery pack according to claim 9, characterized in that: The cold plate structure comprises a cold plate body and a sealing cover, wherein the cold plate body is bonded to the upper surface of the battery module, the sealing cover corresponds to the edge of the cold plate body and is arranged along the circumference of the cold plate body, and the sealing cover is connected to the main body; or, The cold plate structure comprises a cold plate body and a sealing cover, wherein the sealing cover corresponds to the edge of the cold plate body and is arranged along the circumference of the cold plate body, and the sealing cover, the edge of the cold plate body and the main body are connected; or, The cold plate structure comprises a cold plate body and a sealing cover, wherein the lower surface of the cold plate body is connected to the upper surface of the battery module, the sealing cover covers the upper surface of the cold plate body, and the edge of the sealing cover, the edge of the cold plate body and the main body are connected; and / or, Buffering parts are arranged between the supporting longitudinal beam and the bottom guard plate, between the side support and the bottom guard plate, and between the middle support and the bottom guard plate.

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