Battery pack

Abstract

The utility model discloses a battery pack. The battery pack comprises a shell, a battery module, a first tray, a second tray and a bracket, the plurality of battery modules are arranged in the shell and comprise a first battery module and a second battery module, and the first battery module is positioned above the second battery module; the first tray is located between the first battery cells and the second battery cells, the second tray is located below the second battery cells, the first tray is provided with a plurality of first exhaust holes opposite to the first battery cells, and the second tray is provided with a plurality of second exhaust holes opposite to the second battery cells; the support is arranged above the second battery module and located between the second battery module and the first tray, a second pressure relief channel is defined between the second tray and the inner bottom wall of the shell, and heat insulation layers are arranged on the upper surface of the support and the inner bottom wall of the shell. According to the battery pack provided by the utility model, the battery pack can prevent the first battery cells and / or the second battery cells in the adjacent battery modules from being ignited.

Description

Technical Field

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

[0002] In the design process of double-layer module battery packs in the prior art, when the battery cells on one layer of the module experience thermal runaway, a large amount of gas is instantly released from the battery cells accompanied by flames, which can easily ignite the battery cells in adjacent modules, causing other normally used battery cells to also experience thermal runaway, causing the thermal runaway to spread, leading to fire or explosion. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery pack, which can prevent the first battery cell and / or the second battery cell in the adjacent battery module from being ignited.

[0004] According to an embodiment of the utility model, the battery pack includes a shell, a battery module, a first tray, a second tray and a bracket. The battery module is arranged in the shell, the battery module is multiple and includes a first battery module and a second battery module, the first battery module is located above the second battery module, the first battery module includes a first tray and a plurality of first cells, the second battery module includes a second tray and a plurality of second cells, the first explosion-proof valve of the first cell is located on the lower surface of the first cell, the second explosion-proof valve of the second cell is located on the lower surface of the second cell, the first tray is located between the first cell and the second cell, the second tray is located below the second cell, the first tray has a plurality of first exhaust holes arranged opposite to the plurality of first cells, the second tray has a plurality of second exhaust holes arranged opposite to the plurality of second cells; the bracket is arranged above the second battery module and between the second cell and the first tray, a first pressure relief channel is defined between the bracket and the first tray, a second pressure relief channel is defined between the second tray and the inner bottom wall of the shell, and a heat insulation layer is provided on the upper surface of the bracket and the inner bottom wall of the shell.

[0005] According to the battery pack of the embodiment of the utility model, by arranging the first battery module and the second battery module in the up-down direction, the first explosion-proof valve of the first battery cell is located on the lower surface of the first battery cell, the second explosion-proof valve of the second battery cell is located on the lower surface of the second battery cell, the first explosion-proof valve on the first battery cell is arranged in one-to-one correspondence with the first exhaust hole, and the second explosion-proof valve on the second battery cell is arranged in one-to-one correspondence with the second exhaust hole. A first pressure relief channel is defined between the bracket and the first tray, a second pressure relief channel is defined between the second tray and the inner bottom wall of the shell, and a heat insulation layer is provided on the upper surface of the bracket and the inner bottom wall of the shell. When the first battery cell thermally runs away and releases a large amount of gas, the heat insulation layer on the upper surface of the bracket can prevent the thermal runaway from being transmitted to the adjacent second battery module, and the heat insulation layer on the inner bottom wall of the shell can prevent the thermal runaway from being transmitted to other components in the shell, so that other components in the shell, such as the first battery cell, can be prevented from being ignited, thereby effectively preventing the spread and spread of thermal runaway and preventing more serious fires or explosions. At the same time, it can also prevent the first battery cell and / or the second battery cell from being affected by thermal runaway, thereby preventing the battery pack from short-circuiting and arcing.

[0006] In some embodiments of the utility model, the bracket includes a bracket body and a boss arranged on the upper surface of the bracket body, the first tray is mounted on the boss, the upper surface of the bracket body is provided with the thermal insulation layer, and the first pressure relief channel is defined between the first tray, the bracket body and the boss.

[0007] In some embodiments of the present invention, the battery pack also includes a support platform, which is arranged on the inner bottom wall of the shell, and the second tray is installed on the support platform, and the second pressure relief channel is defined between the second tray, the inner bottom wall of the shell and the support platform.

[0008] In some embodiments of the present invention, the plurality of first battery cells in the first battery module are arranged in an array; and / or the plurality of second battery cells in the second battery module are arranged in an array.

[0009] In some embodiments of the present invention, at least one of the first battery cell and the second battery cell is a vertically arranged cylindrical battery cell, a diameter D of the cylindrical battery cell is 20-70 mm, a height H of the cylindrical battery cell in the up and down directions is (1.5-4) D, and a distance L between the centers of two adjacent cylindrical battery cells in the same first battery module or the second battery module is (1.01-1.2) D.

[0010] In some embodiments of the present invention, a height C1 of the first pressure relief channel along the up-down direction is equal to (0.08-0.25)H; and / or a height C2 of the second pressure relief channel along the up-down direction is equal to (0.08-0.25)H.

[0011] In some embodiments of the present invention, the battery pack further includes partitions, which are arranged in sequence along a first direction, the first direction is perpendicular to the up-down direction of the battery pack, the partitions are arranged on the bracket, a receiving space is defined between two adjacent partitions, and the first battery module is arranged in the receiving space; and / or the partitions are arranged on the inner bottom wall of the battery pack, a receiving space is defined between two adjacent partitions, and the second battery module is arranged in the receiving space.

[0012] In some embodiments of the present invention, the battery module further includes a bus assembly, a plurality of the first battery cells are connected to the bus assembly, and / or a plurality of the second battery cells are connected to the bus assembly.

[0013] In some embodiments of the present invention, the battery pack further comprises a copper busbar, which is disposed between the bus assemblies of the two battery modules, the copper busbar is connected to both bus assemblies, and a fireproof layer is provided on the outer surface of the copper busbar.

[0014] In some embodiments of the present invention, the thickness of the thermal insulation layer is 0.1-3 mm.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 is an exploded view of a battery pack according to an embodiment of the utility model;

[0018] Figure 2 is a partial exploded view of a battery pack according to an embodiment of the utility model;

[0019] Figure 3 is an exploded view of a first battery module of a battery pack according to an embodiment of the utility model;

[0020] Figure 4 is a three-dimensional diagram of a second battery module of a battery pack according to an embodiment of the utility model;

[0021] Figure 5 is a three-dimensional diagram of a battery module of a battery pack according to an embodiment of the utility model;

[0022] Figure 6 is a top view of a battery pack according to an embodiment of the utility model with part of the shell removed;

[0023] Figure 7 is a top view of a battery pack according to an embodiment of the utility model;

[0024] Figure 8 is a cross-sectional view of a battery pack according to an embodiment of the utility model;

[0025] Fig. 9 It is a three-dimensional diagram of a bracket of a battery pack according to an embodiment of the utility model.

[0026] Reference numerals:

[0027] 100. Battery pack;

[0028] 1. Shell; 11. Second pressure relief channel; 12. Support platform;

[0029] 2. Battery module; 21. First battery module; 22. Second battery module; 23. First battery cell; 231. First explosion-proof valve; 24. Bus assembly; 25. Second battery cell; 251. Second explosion-proof valve;

[0030] 3. First tray; 31. First exhaust hole;

[0031] 4. second tray; 41. second exhaust hole;

[0032] 5. bracket; 51. heat insulation layer; 52. first pressure relief channel; 53. bracket body; 54. boss;

[0033] 6. Partition; 61. Accommodation space; 7. Copper busbar; 8. Cold plate; 9. Water pipe; 10. BDU. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0035] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" 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 utility model 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 utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Reference below Figure 1-Figure 9 A battery pack 100 according to an embodiment of the present invention is described.

[0038] like Figure 1 and Figure 2 As shown, the battery pack 100 according to the embodiment of the present invention includes a housing 1, a battery module 2, a first tray 3, a second tray 4 and a bracket 5.

[0039] Specifically, Figure 1 and Figure 2 As shown, the battery module 2 is disposed in the housing 1. The battery module 2 is multiple and includes a first battery module 21 and a second battery module 22. The battery module 2 can increase the power of the battery pack 100. When the battery pack 100 is used in a vehicle, the vehicle's cruising range can be improved. The first battery module 21 is located above the second battery module 22. The first battery module 21 and the second battery module 22 are connected in the up-down direction (such as Figure 1 The arrangement in the up and down direction as shown can improve the space utilization of the battery pack 100 and increase the total energy of the battery pack 100 within a limited space.

[0040] like Figure 1-Figure 4As shown, the first battery module 21 includes a first tray 3 and a plurality of first battery cells 23, the second battery module 22 includes a second tray 4 and a plurality of second battery cells 25, the first explosion-proof valve 231 of the first battery cell 23 is located on the lower surface of the first battery cell 23, the second explosion-proof valve 251 of the second battery cell 25 is located on the lower surface of the second battery cell 25, the first tray 3 is located between the first battery cell 23 and the second battery cell 25, the second tray 4 is located below the second battery cell 25, the first tray 3 has a plurality of first exhaust holes 31 arranged opposite to the plurality of first battery cells 23, and the second tray 4 has a plurality of second exhaust holes 41 arranged opposite to the plurality of second battery cells 25. The first explosion-proof valve 231 on the first battery cell 23 is arranged in a one-to-one correspondence with the first exhaust hole 31, and the second explosion-proof valve 251 on the second battery cell 25 is arranged in a one-to-one correspondence with the second exhaust hole 41.

[0041] like Figure 1-Figure 5 As shown, the bracket 5 is arranged above the second battery module 22 and between the second battery cell 25 and the first tray 3. A first pressure relief channel 52 is defined between the bracket 5 and the first tray 3. A second pressure relief channel 11 is defined between the second tray 4 and the inner bottom wall of the shell 1. When thermal runaway occurs in the first battery cell 231, the generated hot gas and flame can break through the first explosion-proof valve 231 and be discharged from the first exhaust hole 31 and be discharged from the first pressure relief channel 52 to the outside of the first battery module 21. When thermal runaway occurs in the second battery cell 25, the generated hot gas and flame can break through the second explosion-proof valve 251 and be discharged from the second exhaust hole 41 and be discharged from the second pressure relief channel 11 to the outside of the second battery module 22, which can prevent the first battery cell 23 with thermal runaway from igniting other first battery cells 23, and can prevent the second battery cell 25 with thermal runaway from igniting other second battery cells 25, effectively preventing the spread and spread of thermal runaway to prevent more serious fire or explosion.

[0042] like Figure 1 and Fig. 9 As shown, the upper surface of the bracket 5 and the inner bottom wall of the shell 1 are provided with a heat insulation layer 51. When the first battery cell 23 in thermal runaway releases a large amount of gas, the heat insulation layer 51 on the upper surface of the bracket 5 can prevent the thermal runaway from being transmitted to the adjacent second battery module 22, protect the second battery cell 25 in the adjacent second battery module 22, and prevent the adjacent second battery cell 25 from being ignited, thereby effectively preventing the spread and spread of thermal runaway, so as to prevent more serious fires or explosions; the heat insulation layer 51 on the inner bottom wall of the shell 1 can prevent the thermal runaway from being transmitted to other components in the shell 1, protect other components in the shell 1 such as the first battery cell 23, etc., and prevent the adjacent first battery cell 23 from being ignited, thereby effectively preventing the spread and spread of thermal runaway, so as to prevent more serious fires or explosions. At the same time, it can also prevent the first battery cell 23 and / or the second battery cell 25 from affecting the bracket 5 and the shell 1 when thermal runaway occurs, and prevent the battery pack 100 from short-circuiting and arcing.

[0043] According to the battery pack 100 of the embodiment of the utility model, by arranging the first battery module 21 and the second battery module 22 in the up-down direction, the first explosion-proof valve 231 of the first battery cell 23 is located on the lower surface of the first battery cell 23, and the second explosion-proof valve 251 of the second battery cell 25 is located on the lower surface of the second battery cell 25, the first explosion-proof valve 231 on the first battery cell 23 is arranged in a one-to-one correspondence with the first exhaust hole 31, and the second explosion-proof valve 251 on the second battery cell 25 is arranged in a one-to-one correspondence with the second exhaust hole 41. A first pressure relief channel 52 is defined between the bracket 5 and the first tray 3, a second pressure relief channel 11 is defined between the second tray 4 and the inner bottom wall of the shell 1, and a heat insulation layer 51 is provided on the upper surface of the bracket 5 and the inner bottom wall of the shell 1. When the first battery cell 23 is in thermal runaway and releases a large amount of gas, the heat insulation layer 51 on the upper surface of the bracket 5 can prevent the thermal runaway from being transmitted to the adjacent second battery module 22, and the heat insulation layer 51 on the inner bottom wall of the shell 1 can prevent the thermal runaway from being transmitted to other components in the shell 1, which can prevent other components in the shell 1 such as the first battery cell 23 from being ignited, thereby effectively preventing the spread and spread of thermal runaway and preventing more serious fires or explosions. At the same time, it can also prevent the first battery cell 23 and / or the second battery cell 25 from affecting the bracket 5 and the shell 1 when thermal runaway occurs, and prevent the battery pack 100 from short-circuiting and arcing.

[0044] In some embodiments of the present invention, Figure 1 and Fig. 9 As shown, the bracket 5 includes a bracket body 53 and a boss 54 provided on the upper surface of the bracket body 53, the first tray 3 is mounted on the boss 54, the upper surface of the bracket body 53 is provided with a heat insulation layer 51, and a first pressure relief channel 52 is defined between the first tray 3, the bracket body 53 and the boss 54. The boss 54 can support the first tray 3, and can ensure that the first pressure relief channel 52 between the first tray 3 and the bracket body 53 has a certain height, and can ensure that when the first battery cell 23 has thermal runaway, the generated hot gas and flame can break through the first explosion-proof valve 231 and be discharged from the first exhaust hole 31 and discharged from the first pressure relief channel 52 to the outside of the first battery module 21, which can prevent the first battery cell 23 in thermal runaway from igniting other first battery cells 23 and / or the second battery cell 25, and effectively prevent the spread and spread of thermal runaway, so as to prevent more serious fire or explosion.

[0045] In some embodiments of the present invention, Figure 1 and Figure 8As shown, the battery pack 100 further includes a support platform 12, which is disposed on the inner bottom wall of the shell 1, and the second tray 4 is mounted on the support platform 12, and a second pressure relief channel 11 is defined between the second tray 4, the inner bottom wall of the shell 1 and the support platform 12. The support platform 12 can support the second tray 4, and can ensure that the second pressure relief channel 11 between the second tray 4 and the inner bottom wall of the shell 1 has a certain height, and can ensure that when the second battery cell 25 in the second battery module 22 has thermal runaway, the generated hot gas and flame can break through the second explosion-proof valve 251 and be discharged from the second exhaust hole 41 and discharged from the second pressure relief channel 11 to the outside of the second battery module 22, which can prevent the second battery cell 25 in thermal runaway from igniting other first battery cells 23 and / or second battery cells 25, and effectively prevent the spread and spread of thermal runaway, so as to prevent more serious fire or explosion.

[0046] In some embodiments of the present invention, Figure 1 , Figure 3 and Figure 5 As shown, the first battery module 21 has a plurality of first cells 23 arranged in an array; and / or, the second battery module 22 has a plurality of second cells 25 arranged in an array, and the directions of the rows and columns are respectively aligned with the length direction of the battery pack 100 (eg Figure 1 a direction as shown) and width direction (as shown Figure 1 b direction as shown). The number of first battery cells 23 and / or second battery cells 25 in each row is the same, and the number of first battery cells 23 and / or second battery cells 25 in each column is the same. This can make the layout of the first battery cells 23 and / or second battery cells 25 more regular, and the arrangement of the first battery cells 23 and / or second battery cells 25 more beautiful.

[0047] In some embodiments of the present invention, Figure 1 , Figure 3 and Figure 5 As shown, the battery pack 100 also includes a cold plate 8, which is arranged between two adjacent columns of first battery cells 23 or second battery cells 25. The cold plate 8 can be provided with a cooling channel. The battery pack 100 also includes a water pipe 9, which is connected to the cold plate 8 and can provide coolant for the cold plate 8. The coolant can flow in the cooling channel. The first battery cell 23 and / or the second battery cell 25 may generate heat during operation. The cold plate 8 can cool the first battery cell 23 and / or the second battery cell 25 to reduce the risk of thermal runaway of the first battery cell 23 and / or the second battery cell 25.

[0048] Of course, the present invention is not limited to this. When the working environment of the battery pack 100 is relatively cold, the liquid with a higher temperature may flow into the cooling channel, so as to make the temperature of the first battery cell 23 and / or the second battery cell 25 more uniform, thereby preventing the activity of various substances in the first battery cell 23 and / or the second battery cell 25 from being reduced due to severe cold, thereby preventing the first battery cell 23 and / or the second battery cell 25 from attenuating.

[0049] In some embodiments of the present invention, Figure 6 and Figure 7 As shown, the battery pack 100 also includes a BDU (Battery energy Distribution Unit) 10, which can control the current flow and supply the current to different loads.

[0050] In some embodiments of the present invention, at least one of the first battery cell 23 and the second battery cell 25 is a vertically arranged cylindrical battery cell, the diameter D of the cylindrical battery cell is 20-70 mm, the height of the cylindrical battery cell in the up and down direction is H = (1.5-4) D, and the distance L between the centers of two adjacent cylindrical battery cells in the same first battery module 21 or the second battery module 22 is L = (1.01-1.2) D.

[0051] It is understandable that the diameter D of the cylindrical cell can be 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm or 70mm. The diameter of the cylindrical cell is not less than 20mm, which can avoid the cylindrical cell having a smaller diameter, which can avoid the cylindrical cell storing less energy, and can increase the energy storage of the battery pack 100; the diameter of the cylindrical cell is not more than 70mm, which can avoid the cylindrical cell having a larger size, and can make the layout of the first cell 23 and / or the second cell 25 in the battery pack 100 more reasonable.

[0052] It is understandable that the height of the cylindrical cell in the vertical direction can be 1.5D, 2D, 2.5D, 3D, 3.5D or 4D. The height of the cylindrical cell in the vertical direction is not less than 1.5D, which can avoid the cylindrical cell having a smaller diameter, can avoid the cylindrical cell storing less energy, and can increase the energy storage of the battery pack 100; the height of the cylindrical cell in the vertical direction is not greater than 4D, which can avoid the cylindrical cell having a larger size, and can make the layout of the first cell 23 and / or the second cell 25 in the battery pack 100 more reasonable.

[0053] It can be understood that the distance between the centers of two adjacent cylindrical cells in the same first battery module 21 or the second battery module 22 can be 1.01D, 1.02D, 1.03D, 1.04D, 1.05D, 1.06D, 1.07D, 1.08D, 1.09D, 1.1D, 1.11D, 1.12D, 1.13D, 1.14D, 1.15D, 1.16D, 1.17D, 1.18D, 1.19D or 1.2D, and the distance between the centers of two adjacent cylindrical cells in the same first battery module 21 or the second battery module 22 is not less than 1.01D, which can avoid the adjacent two first battery cells 23 or the same The distance between two adjacent second battery cells 25 is too small, which can reduce the risk of heat from the first battery cell 23 being transferred to the adjacent first battery cell 23, and the risk of heat from the second battery cell 25 being transferred to the adjacent second battery cell 25, so that the heat of the first battery cell 23 can be better transferred to the first pressure relief channel 52, and the heat of the second battery cell 25 can be better transferred to the second pressure relief channel 11; the distance between the centers of two adjacent cylindrical battery cells in the same first battery module 21 or second battery module 22 is not greater than 1.2D, so that a larger number of first battery cells 23 and second battery cells 25 can be installed in the battery pack 100, and the energy density in the battery pack 100 can be increased.

[0054] Further, the height C1 of the first pressure relief channel 52 along the vertical direction is (0.08-0.25) H. It can be understood that the height of the first pressure relief channel 52 along the vertical direction can be 0.08H, 0.09H, 0.1H, 0.11H, 0.12H, 0.13H, 0.14H, 0.15H, 0.16H, 0.17H, 0.18H, 0.19H, 0.2H, 0.21H, 0.22H, 0.23H, 0.24H or 0.25H. The height of the first pressure relief channel 52 along the up-down direction is not less than 0.08H, so that the first pressure relief channel 52 has a certain height, which can ensure the pressure relief effect of the first pressure relief channel 52; the height of the first pressure relief channel 52 along the up-down direction is not greater than 0.25H, which can avoid the first pressure relief channel 52 from being too large, and can avoid the battery pack 100 from being too large, and can make the layout of the first battery cell 23 in the battery pack 100 more reasonable.

[0055] Further, the height C2 of the second pressure relief channel 11 along the vertical direction is (0.08-0.25) H. It can be understood that the height of the second pressure relief channel 11 along the vertical direction can be 0.08H, 0.09H, 0.1H, 0.11H, 0.12H, 0.13H, 0.14H, 0.15H, 0.16H, 0.17H, 0.18H, 0.19H, 0.2H, 0.21H, 0.22H, 0.23H, 0.24H or 0.25H. The height of the second pressure relief channel 11 along the up-down direction is not less than 0.08H, so that the second pressure relief channel 11 has a certain height, which can ensure the pressure relief effect of the second pressure relief channel 11; the height of the second pressure relief channel 11 along the up-down direction is not greater than 0.25H, which can avoid the second pressure relief channel 11 from being too large, and can avoid the battery pack 100 from being too large, and can make the layout of the second battery cell 25 in the battery pack 100 more reasonable.

[0056] In some embodiments of the present invention, Figure 1 As shown, the battery pack 100 further includes a partition 6, and the partition 6 is arranged along a first direction (such as Figure 1 The first direction is perpendicular to the up-down direction of the battery pack 100. The partition 6 is arranged on the bracket 5, and a receiving space 61 is defined between two adjacent partitions 6. The first battery module 21 is arranged in the receiving space 61. The partition 6 can provide support for the first battery cells 23 in the first battery modules 21 in the first direction, so that the position of the first battery cells 23 in the first direction is more reliable, and the partition 6 can protect the first battery cells 23 in the first battery module 21 located in the receiving space 61, to prevent the first battery cells 23 from being damaged by external impact, and to prevent the first battery cells 23 from spontaneous combustion.

[0057] The partition 6 is disposed on the inner bottom wall of the battery pack 100, and a receiving space 61 is defined between two adjacent partitions 6, and the second battery module 22 is disposed in the receiving space 61. The partition 6 can provide support for the second battery cells 25 in the plurality of second battery modules 22 in the first direction, so that the position of the second battery cells 25 in the first direction is more reliable, and the partition 6 can protect the second battery cells 25 in the second battery module 22 located inside the receiving space 61, to prevent the second battery cells 25 from being damaged due to external impact, and to prevent the second battery cells 25 from spontaneous combustion.

[0058] Furthermore, if Figure 3As shown, the battery module 2 further includes a bus assembly 24, and a plurality of first cells 23 are connected to the bus assembly 24, and / or a plurality of second cells 25 are connected to the bus assembly 24. The bus assembly 24 can concentrate the power of the plurality of first cells 23 in the first battery module 21 onto the bus assembly 24, and the bus assembly 24 can concentrate the power of the plurality of second cells 25 in the second battery module 22 onto the bus assembly 24, so that the electrical connection in the battery module 2 can be more concentrated.

[0059] Furthermore, if Figure 2 As shown, the battery pack 100 further includes a copper bar 7, which is disposed between the bus assemblies 24 of the two battery modules 2, and is connected to both bus assemblies 24, so that the copper bar 7 can realize the electrical connection of the two battery modules 2. The outer surface of the copper bar 7 is provided with a fireproof layer, which can protect the copper bar 7 and prevent the high-temperature gas released when the first battery cell 23 and / or the second battery cell 25 is in thermal runaway from damaging the copper bar 7.

[0060] In some embodiments of the present invention, the thickness of the thermal insulation layer 51 is 0.1-3 mm. It is understandable that the thickness of the thermal insulation layer 51 can be 0.1 mm, 0.4 mm, 0.7 mm, 1 mm, 1.3 mm, 1.6 mm, 1.9 mm, 2.2 mm, 2.5 mm, 2.7 mm or 3 mm. The thickness of the thermal insulation layer 51 is not less than 0.1 mm, so that the thermal insulation layer 51 has a certain thickness, which can ensure the thermal insulation effect of the thermal insulation layer 51; the thickness of the thermal insulation layer 51 is not more than 3 mm, which can avoid the thermal insulation layer 51 being too thick, and can avoid the thermal insulation layer 51 affecting the height of the first pressure relief channel 52 or the second pressure relief channel 11, and avoid affecting the pressure relief effect of the battery module 2.

[0061] Other structures and operations of the battery pack 100 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0063] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: case; A battery module, wherein the battery module is arranged in the shell, the battery module is multiple and includes a first battery module and a second battery module, the first battery module is located above the second battery module, the first battery module includes a first tray and a plurality of first battery cells, the second battery module includes a second tray and a plurality of second battery cells, a first explosion-proof valve of the first battery cell is located on a lower surface of the first battery cell, a second explosion-proof valve of the second battery cell is located on a lower surface of the second battery cell, the first tray is located between the first battery cell and the second battery cell, the second tray is located below the second battery cell, the first tray has a plurality of first exhaust holes arranged opposite to the plurality of the first battery cells, and the second tray has a plurality of second exhaust holes arranged opposite to the plurality of the second battery cells; A bracket is arranged above the second battery module and between the second battery cell and the first tray, a first pressure relief channel is defined between the bracket and the first tray, a second pressure relief channel is defined between the second tray and the inner bottom wall of the shell, and an upper surface of the bracket and the inner bottom wall of the shell are provided with a heat insulation layer.

2. The battery pack according to claim 1, characterized in that: The bracket includes a bracket body and a boss arranged on the upper surface of the bracket body, the first tray is installed on the boss, the upper surface of the bracket body is provided with the heat insulation layer, and the first pressure relief channel is defined between the first tray, the bracket body and the boss.

3. The battery pack according to claim 1, characterized in that: Also includes: A support platform is provided on the inner bottom wall of the shell, the second tray is installed on the support platform, and the second pressure relief channel is defined between the second tray, the inner bottom wall of the shell and the support platform.

4. The battery pack according to claim 1, characterized in that: The plurality of first battery cells in the first battery module are arranged in an array; And / or, the plurality of second battery cells in the second battery module are arranged in an array.

5. The battery pack according to claim 1, characterized in that: At least one of the first battery cell and the second battery cell is a vertically arranged cylindrical battery cell, a diameter D of the cylindrical battery cell is 20-70 mm, a height H of the cylindrical battery cell in the up and down directions is (1.5-4) D, and a distance L between the centers of two adjacent cylindrical battery cells in the same first battery module or the second battery module is (1.01-1.2) D.

6. The battery pack according to claim 5, characterized in that: The height C1 of the first pressure relief channel in the up-down direction = (0.08-0.25) H; And / or, a height C2 of the second pressure relief channel in the up-down direction is (0.08-0.25)H.

7. The battery pack according to claim 1, characterized in that: Also includes: The partitions are arranged in sequence along a first direction, wherein the first direction is perpendicular to the up-down direction of the battery pack. The partition is arranged on the bracket, and a receiving space is defined between two adjacent partitions, and the first battery module is arranged in the receiving space; And / or, the partition is arranged on the inner bottom wall of the battery pack, the accommodation space is defined between two adjacent partitions, and the second battery module is arranged in the accommodation space.

8. The battery pack according to claim 7, characterized in that: The battery module also includes: A bus assembly, a plurality of the first battery cells are connected to the bus assembly, and / or a plurality of the second battery cells are connected to the bus assembly.

9. The battery pack according to claim 8, characterized in that: Also includes: A copper bar, wherein the copper bar is arranged between the bus assemblies of the two battery modules, the copper bar is connected to both bus assemblies, and a fireproof layer is arranged on the outer surface of the copper bar.

10. The battery pack according to claim 1, characterized in that: The thickness of the heat insulation layer is 0.1-3 mm.

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