Battery pack

Abstract

The utility model belongs to the technical field of batteries, in particular relates to a battery pack, and aims to solve the problem of poor heat dissipation efficiency. The battery pack comprises a box body as well as a battery module, a radiator and a fan which are all arranged in the box body, and an exhaust valve is arranged on the box body, so that heat in the box body can be discharged. The radiator is arranged on the battery module and is in contact with the battery module, heat of the battery module can be transferred to the radiator, and the fan is arranged on one side of the battery module and cools the radiator, so that the radiating efficiency is improved, liquid leakage is avoided, the reliability is improved, and the problem of high temperature caused by liquid leakage is avoided.

Description

Technical Field

[0001] The embodiments of the utility model relate to the field of battery technology, and in particular to a battery pack. Background Art

[0002] With the rapid development of economy and technology, battery packs are increasingly used. Battery packs are a power source that provides power for tools (such as electric cars, electric trains, electric bicycles, and golf carts). They often generate heat and increase in temperature during operation, so the battery pack needs to be cooled.

[0003] There are two cooling methods for battery packs: air cooling and liquid cooling. The cooling medium for liquid cooling is liquid, such as water, ethylene glycol aqueous solution, pure ethylene glycol, air conditioning refrigerant, silicone oil, etc., which has a better cooling effect, but needs to be used in conjunction with the vehicle's thermal management system. Once a problem occurs with the vehicle's thermal management system, the battery pack's heat dissipation capacity may fail, resulting in danger. The cooling medium for air cooling is air, which has a simple structure, is easy to maintain, and has low cost, and can avoid high temperature problems caused by leakage. However, the heat dissipation efficiency of air cooling is low. Utility Model Content

[0004] In view of the above problems, an embodiment of the present invention provides a battery pack to improve the heat dissipation efficiency of the battery pack.

[0005] An embodiment of the utility model provides a battery pack, which includes a box body, a battery module, a radiator and a fan, wherein the box body is provided with an exhaust valve, the battery module, the radiator and the fan are provided in the box body, the radiator is provided on the battery module and in contact with the battery module, and the fan is provided on one side of the battery module to cool the radiator.

[0006] In some possible examples, the heat sink includes a heat dissipation substrate and a plurality of heat dissipation fins, the heat dissipation substrate is disposed on the battery module, the plurality of heat dissipation fins are arranged at intervals along a first direction and are disposed on a side of the heat dissipation substrate away from the battery module.

[0007] In some possible examples, along the first direction, the fan and the exhaust valve are respectively located on both sides of the heat dissipation fin.

[0008] In some possible examples, the fan and the exhaust valve are both opposite to the radiator.

[0009] In some possible examples, the battery module includes a plurality of battery cells arranged at intervals, and a heat conductive member disposed between two adjacent battery cells, and both the battery cells and the heat conductive member are in contact with the heat sink.

[0010] In some possible examples, the battery module further includes an end plate disposed outside the plurality of battery cells, and a surface of the end plate facing away from the battery cells has a plurality of protrusions disposed at intervals.

[0011] In some possible examples, the box body includes a bottom plate and a cover plate relatively arranged, and a side plate arranged between the bottom plate and the cover plate, the bottom plate, the side plate and the cover plate enclose a containing cavity, and the exhaust valve is arranged on the side plate.

[0012] In some possible examples, the box body further includes a longitudinal beam, and a cross beam correspondingly arranged on both sides of the longitudinal beam, two ends of the longitudinal beam are respectively connected to the side panels, and two ends of the cross beam are respectively connected to the longitudinal beam and the side panels;

[0013] The battery module is arranged in an area enclosed by the cross beam, the longitudinal beam and the side panels, and abuts against the cross beams on both sides.

[0014] In some possible examples, the fan is disposed on the cross beam or the longitudinal beam.

[0015] In some possible examples, the battery pack further includes a controller, which is disposed in an area enclosed by the cross beam, the longitudinal beam, and the side panels, and is separated from the battery module by the cross beam.

[0016] The battery pack of the present utility model has at least the following advantages:

[0017] The battery pack in the embodiment of the utility model includes a box body, and a battery module, a radiator and a fan are all arranged in the box body. The box body is provided with an exhaust valve so that the heat in the box body can be discharged. The radiator is arranged on the battery module and contacts the battery module, and the heat of the battery module can be transferred to the radiator. The fan is arranged on one side of the battery module and cools the radiator, thereby improving the heat dissipation efficiency, and will not cause leakage, thereby improving reliability and avoiding the high temperature problem caused by leakage.

[0018] In addition to the technical problems solved by the embodiments of the utility model described above, the technical features that constitute the technical solution, and the beneficial effects brought about by the technical features of these technical solutions, other technical problems that can be solved by the battery pack provided by the embodiments of the utility model, other technical features included in the technical solution, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is a three-dimensional diagram of a battery pack in an embodiment of the present utility model;

[0021] Figure 2 A top view of a battery pack in an embodiment of the present utility model;

[0022] Figure 3 It is a schematic diagram of a battery module and a radiator in an embodiment of the utility model.

[0023] Description of reference numerals:

[0024] 11-first plate; 12-second plate;

[0025] 13-third plate; 14-fourth plate;

[0026] 15-accommodating cavity; 16-bottom plate;

[0027] 17-longitudinal beam; 18-transverse beam;

[0028] 20-exhaust valve; 30-radiator;

[0029] 31- heat dissipation substrate; 32- heat dissipation fins;

[0030] 40-fan; 50-controller;

[0031] 60-battery module; 61-battery cell;

[0032] 62-heat conducting member; 63-end plate;

[0033] 64-Bump. DETAILED DESCRIPTION

[0034] The utility model provides a battery pack, including a box, a battery module, a radiator and a fan. The radiator is arranged on the battery module and in contact with the battery module, and the heat of the battery module can be transferred to the radiator. The fan is arranged on one side of the battery module, the radiator is cooled by the fan, and the heat in the box is discharged by the exhaust valve arranged in the box, thereby improving the heat dissipation efficiency.

[0035] In order to make the above-mentioned purposes, features and advantages of the embodiments of the utility model more obvious and easy to understand, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0036] See also Figures 1 to 3 The embodiment of the utility model provides a battery pack, which can be a cell-to-pack (CTP) battery pack to improve energy density, reduce costs, and reduce layout space.

[0037] The battery pack specifically includes a box, a battery module 60, a radiator 30 and a fan 40. The box is used to accommodate other structures and provide protection for them. An exhaust valve 20 is provided on the box. The exhaust valve 20 is a one-way air-permeable valve. The hot air in the box can be discharged to the external environment through the exhaust valve 20, and the cold air in the external environment cannot enter the box through the exhaust valve 20. In this way, the box can be kept in a high-pressure state and the external environment can be kept in a low-pressure state, thereby ensuring the sealing inside the battery pack.

[0038] In some possible examples, the box body includes a bottom plate 16 arranged opposite to the bottom plate 16 (see Figure 2 ) and a cover plate (not shown in the figure), and a side plate arranged between the bottom plate 16 and the cover plate. The bottom plate 16, the cover plate and the side plate enclose a receiving chamber 15, and the exhaust valve 20 is arranged on the side plate.

[0039] The side plate surrounds the bottom plate 16, and one end of the side plate is connected to the bottom plate 16, for example, the side plate and the bottom plate 16 are an integral structure, and the other end of the side plate is enclosed to form an opening, and a cover plate is buckled on the opening, for example, the cover plate is snapped to the side plate, etc. The bottom plate 16, the side plate and the cover plate can form a closed space in the receiving cavity 15 of the box to ensure the sealing of the battery pack.

[0040] like Figure 1 As shown, the side plate is provided with an exhaust valve 20. By drilling a hole in the side plate to install the exhaust valve 20, the damage to the structural strength of the bottom plate 16 can be reduced, and the supporting performance of the bottom plate 16 can be ensured. There can be multiple exhaust valves 20, and the multiple exhaust valves 20 are arranged at intervals on the side plate.

[0041] The side plate includes a first plate 11 and a second plate 12 that are arranged opposite to each other, and a third plate 13 and a fourth plate 14 that are connected between the first plate 11 and the second plate 12. The first plate 11, the third plate 13, the second plate 12 and the fourth plate 14 are connected end to end in sequence, and one end of the fourth plate 14 away from the second plate 12 is connected to one end of the first plate 11 away from the third plate 13, so that the side plate forms a ring.

[0042] The first plate 11 is provided with a plurality of exhaust valves 20, and the plurality of exhaust valves 20 are arranged at intervals along the arrangement direction of the third plate 13 and the fourth plate 14, that is, the plurality of exhaust valves 20 are arranged horizontally, which is perpendicular to the height direction of the box body, and the height direction of the box body is the arrangement direction of the bottom plate 16 and the cover plate. In this way, it is convenient to arrange the plurality of exhaust valves 20, and the size of each exhaust valve 20 is less restricted, that is, the size of each exhaust valve 20 can be larger.

[0043] The box body is also provided with a battery module 60, a radiator 30 and a fan 40, that is, the battery module 60, the radiator 30 and the fan 40 are all arranged in the accommodating cavity 15, so as to facilitate the installation and movement of the battery pack. The battery module 60 is used to provide electrical energy to be converted into kinetic energy to drive electric vehicles, electric trains, electric bicycles, golf carts, etc. to move, and the radiator 30 and the fan 40 are both used to dissipate heat from the battery module 60 to improve the heat dissipation efficiency of the battery pack.

[0044] Some possible examples include Figure 2 The box body also includes a crossbeam 18 and a longitudinal beam 17. The crossbeam 18 and the longitudinal beam 17 are both arranged in the accommodating cavity 15. The two ends of the longitudinal beam 17 are respectively connected to the side panels, for example, the two ends of the longitudinal beam 17 are respectively welded to the side panels. The two sides of the longitudinal beam 17 are correspondingly provided with crossbeams 18. The two ends of the crossbeam 18 are respectively connected to the longitudinal beam 17 and the side panels, for example, the crossbeam 18 and the longitudinal beam 17 are an integral structure, and the end of the crossbeam 18 away from the longitudinal beam 17 is welded to the side panel. The crossbeam 18 and the longitudinal beam 17 can provide pre-tightening force for the side panels, improve the stability of the box body, and thus improve the rigidity of the battery pack.

[0045] Specifically, the longitudinal beam 17 connects the first plate 11 and the second plate 12, and its extension direction is consistent with the extension direction of the heat dissipation fins 32, that is, the same as the length direction of the box. One end of the cross beam 18 is connected to the longitudinal beam 17, and the other end is connected to the third plate 13 or the fourth plate 14.

[0046] For example, the cross beam 18 on one side of the longitudinal beam 17 is connected to the third plate 13, and the cross beam 18 on the other side of the longitudinal beam 17 is connected to the fourth plate 14. The extension direction of the cross beam 18 can be perpendicular to the extension direction of the longitudinal beam 17, that is, consistent with the width direction of the box. The height direction of the cross beam 18 and the longitudinal beam 17 can be consistent, and consistent with the height direction of the box, so as to facilitate the alignment and installation of the cross beam 18 and the longitudinal beam 17.

[0047] There may be multiple cross beams 18 on each side of the longitudinal beam 17, for example, there may be two cross beams 18 on each side of the longitudinal beam 17. The cross beams 18 on both sides of the longitudinal beam 17 may be aligned, for example, the extension directions of the corresponding cross beams 18 on both sides of the longitudinal beam 17 coincide. The longitudinal beam 17 and the cross beam 18 may both be rectangular columns to facilitate fixing other structures (such as the fan 40 or the battery module 60).

[0048] It is understandable that the longitudinal beam 17 and the cross beam 18 may be in contact with the bottom plate 16, or may be spaced apart from the bottom plate 16. The cross beam 18 and the longitudinal beam 17 divide the accommodating cavity 15 of the box into a plurality of areas, wherein the battery module 60 is arranged in the area enclosed by the cross beam 18, the longitudinal beam 17 and the side plate, and abuts against the cross beam 18, so as to facilitate the cross beam 18 to clamp the battery module 60, and further fix the battery module 60.

[0049] Specifically, at least one of the two sides of the battery module 60 is provided with a cross beam 18, and the battery module 60 abuts against the cross beam 18. For example, the battery module 60 is provided with a cross beam 18 on both sides, and both ends of the battery module 60 abut against the cross beam 18, so that the battery module 60 is clamped between the two cross beams 18, thereby improving the stability of the battery module 60.

[0050] Among them, at least one battery module 60 can be arranged on each side of the longitudinal beam 17. Figure 2 , a battery module 60 is disposed on each side of the longitudinal beam 17. At least one battery module 60 located on one side of the longitudinal beam 17 is abutted and fixed by the cross beam 18 located on the side of the longitudinal beam 17. For example, the battery module 60 on the left side of the longitudinal beam 17 abuts against the cross beam 18 on the left side of the longitudinal beam 17.

[0051] A fan 40 may also be provided on the cross beam 18 or the longitudinal beam 17, for example, by using screws, bolts or flanges to fix the fan 40 on the cross beam 18 or the longitudinal beam 17. In this way, the fan 40 may be raised so that the fan 40 is opposite to the radiator 30, thereby improving the fluidity of the hot air near the radiator 30, facilitating the discharge of the hot air, and improving the heat dissipation efficiency.

[0052] The cross beam 18 is provided with a fan 40 so that the fan 40 is opposite to the whole battery module 60 to improve the heat dissipation efficiency. For example, two fans 40 are provided on a group of two cross beams 18 corresponding to the two sides of the longitudinal beam 17. The two cross beams 18 in a group refer to a cross beam 18 on one side of the longitudinal beam 17 and a cross beam 18 on the other side of the longitudinal beam 17 that is closest to the cross beam 18. The two cross beams 18 may be facing each other along the extension direction perpendicular to the longitudinal beam 17.

[0053] Continue reading Figures 1 to 3The heat sink 30 is disposed on the battery module 60 and in contact with the battery module 60. Figure 1 and Figure 3 As shown, the radiator 30 is arranged on the upper surface of the battery module 60 to dissipate heat from the battery module 60. In this way, the radiator 30 is supported by the battery module 60, which can reliably resist the weight of the radiator 30 and make the radiator 30 and the battery module 60 more securely fixed.

[0054] The heat sink 30 can be bonded to the battery module 60 by means of thermally conductive adhesive to fix the heat sink 30 and the battery module 60 , and the thermally conductive adhesive can also transfer the heat of the battery module 60 to the heat sink 30 .

[0055] Specifically, the heat sink 30 includes a heat sink substrate 31 and a plurality of heat sink fins 32. The heat sink substrate 31 is disposed on the battery module 60. The plurality of heat sink fins 32 are arranged at intervals along the first direction and are disposed on a side of the heat sink substrate 31 away from the battery module 60. The heat sink substrate 31 and the heat sink fins 32 can both be made of metal materials, which have good thermal conductivity. The heat sink substrate 31 and the heat sink fins 32 can also be an integrated structure for easy manufacturing.

[0056] The size of the heat dissipation substrate 31 is adapted to the size of the battery module 60 to increase the contact area between the heat dissipation substrate 31 and the battery module 60 and improve the heat conduction efficiency. Exemplarily, the outer peripheral surface of the heat dissipation substrate 31 is substantially aligned with the outer peripheral surface of the battery module 60, or the outer peripheral surface of the heat dissipation substrate 31 protrudes from the outer peripheral surface of the battery module 60. The heat dissipation fins 32 and the battery module 60 are respectively located on both sides of the heat dissipation substrate 31, and the heat dissipation surface area can be increased by using the heat dissipation fins 32.

[0057] The total height of the heat dissipation fins 32, the heat dissipation substrate 31 and the battery module 60 is adapted to the height of the box to prevent the heat dissipation fins 32 from protruding from the box, and at the same time, the space utilization rate in the box can be improved. A plurality of heat dissipation fins 32 are arranged at intervals along a first direction, which can be the length direction of the box, and also the arrangement direction of the first plate 11 and the second plate 12. In this way, the heat dissipation channel formed between adjacent heat dissipation fins 32 is opposite to the exhaust valve 20, so as to guide the hot air in the box to the exhaust valve 20, improve the uniformity of the hot air flow in the box, and also facilitate the discharge of the hot air in the box.

[0058] Continue reading Figures 1 to 3, the fan 40 is arranged on one side of the battery module 60, for example, the fan 40 is arranged on the side of the radiator 30 away from the exhaust valve 20. Exemplarily, along the first direction, the fan 40 and the exhaust valve 20 are respectively located on both sides of the heat dissipation fins 32. In this way, the arrangement direction of the fan 40, the exhaust valve 20 and the heat dissipation fins 32 is well consistent with the flow direction of the hot air, which facilitates the exhaust of the hot air and improves the heat dissipation efficiency.

[0059] The fan 40 and the exhaust valve 20 are both opposite to the radiator 30, that is, the height positions of the fan 40, the exhaust valve 20 and the radiator 30 are substantially the same. The fan 40 and the radiator 30 are opposite, so that the fan 40 can blow directly to the radiator 30, thereby improving the cooling effect of the fan 40 on the radiator 30. At the same time, the radiator 30 and the exhaust valve 20 are opposite, which can reduce the flow path of hot air, improve the exhaust efficiency of hot air, and thus improve the heat dissipation efficiency.

[0060] See also Figure 3 The battery module 60 includes a plurality of battery cells 61 arranged at intervals, and a heat conducting member 62 disposed between two adjacent battery cells 61, and both the battery cells 61 and the heat conducting member 62 are in contact with the heat sink 30. The plurality of battery cells 61 may be arranged at intervals along the first direction, and the battery cells 61 may be rectangular.

[0061] The battery cell 61 may be a side-outlet pole battery cell 61, that is, the pole of the battery cell 61 is located on the side of the battery cell 61. In this way, the heat sink 30 may be disposed on the top of the battery cell 61, which has a better supporting effect on the heat sink 30. In other examples, the battery cell 61 may also be a top-outlet pole battery cell 61, in which case the heat sink 30 is disposed on the side of the battery cell 61.

[0062] The battery cell 61 is in contact with the radiator 30 to transfer the heat of the battery cell 61 to the radiator 30. A heat conductor 62 may also be provided between adjacent battery cells 61, for example, the battery cell 61 and the heat conductor 62 are connected by a structural adhesive. The heat conductor 62 is also in contact with the radiator 30, so that the heat of the battery cell 61 can also be transferred to the radiator 30 through the heat conductor 62, thereby improving the cooling efficiency of the battery cell 61. Among them, the heat conductor 62 can cover the side of the corresponding battery cell 61 to increase the heat dissipation area of ​​the battery cell 61 and the heat conductor 62, thereby effectively taking away the large surface heat of the battery cell 61, and the heat transfer efficiency is higher.

[0063] The heat conductor 62 includes a graphite sheet or a heat pipe. The graphite sheet has a high thermal conductivity or a phase change in the heat pipe, which can quickly transfer heat to the radiator 30 to improve the heat dissipation efficiency. Among them, the heat conductor 62 can also include other high thermal conductivity materials. The overall heat dissipation path of the battery pack is: the battery cell 61 transfers heat to the radiator 30 through itself or the heat conductor 62, takes away the heat from the radiator 30 through the fan 40, and transfers the heat to the external environment through the exhaust valve 20.

[0064] In some possible examples, the battery module 60 also includes an end plate 63 arranged on the outside of the plurality of battery cells 61. For example, an end plate 63 is respectively arranged on the side away from each other of the plurality of battery cells 61. The surface of the end plate 63 away from the battery cell 61 has a plurality of protrusions 64 arranged at intervals, that is, the protrusions 64 face the side plate. By providing the protrusions 64, the contact area between the end plate 63 and the crossbeam 18 can be reduced, and the crossbeam 18 can be prevented from excessively squeezing the end plate 63, thereby avoiding deformation of the battery cell 61. Among them, the protrusions 64 can be arranged in an array, and their shape can be rectangular. The end plate 63 can also include a foam layer to increase the elasticity of the end plate 63, absorb vibration and extrusion, and provide buffering.

[0065] Continue reading Figure 1 and Figure 2 The battery pack also includes a controller 50, which includes a control circuit, a fuse structure (such as a fuse), etc. The controller 50 serves as a battery distribution unit (BDU) and can control the connected battery modules 60. The controller 50 can be fixed in the box by its own bracket.

[0066] The controller 50 is disposed in the area enclosed by the cross beam 18, the longitudinal beam 17 and the side panels, and is separated from the battery module 60 by the cross beam 18. Figure 2 As shown, the controller 50 and the battery module 60 are respectively located on both sides of the crossbeam 18 , and the controller 50 and the crossbeam 18 may be spaced apart.

[0067] In summary, the battery pack provided in the embodiment of the present application specifically includes a box body, and a battery module 60, a radiator 30 and a fan 40 are all arranged in the box body. The box body is provided with an exhaust valve 20 so that the heat in the box body can be discharged. The radiator 30 is arranged on the battery module 60 and contacts the battery module 60, and the heat of the battery module 60 can be transferred to the radiator 30. The fan 40 is arranged on one side of the battery module 60 and cools the radiator 30, thereby improving the heat dissipation efficiency, and will not cause leakage, thereby improving reliability and avoiding the high temperature problem caused by leakage.

[0068] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0069] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred system or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0070] 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 embodiments or examples 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 may be combined in any one or more embodiments or examples in a suitable manner.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A battery pack, characterized in that: include: A box body, a battery module, a radiator and a fan, wherein the box body is provided with an exhaust valve, the battery module, the radiator and the fan are provided in the box body, the radiator is provided on the battery module and contacts the battery module, and the fan is provided on one side of the battery module to cool the radiator.

2. The battery pack according to claim 1, characterized in that: The heat sink comprises a heat dissipation substrate and a plurality of heat dissipation fins. The heat dissipation substrate is arranged on the battery module. The plurality of heat dissipation fins are arranged at intervals along a first direction and are arranged on a side of the heat dissipation substrate away from the battery module.

3. The battery pack according to claim 2, characterized in that: Along the first direction, the fan and the exhaust valve are respectively located on two sides of the heat dissipation fins.

4. The battery pack according to any one of claims 1 to 3, characterized in that: The fan and the exhaust valve are both opposite to the radiator.

5. The battery pack according to any one of claims 1 to 3, characterized in that: The battery module includes a plurality of battery cells arranged at intervals, and a heat conductive member arranged between two adjacent battery cells, and both the battery cells and the heat conductive member are in contact with the heat sink.

6. The battery pack according to claim 5, characterized in that: The battery module further comprises an end plate arranged outside the plurality of battery cells, and a surface of the end plate facing away from the battery cells comprises a plurality of protrusions arranged at intervals.

7. The battery pack according to any one of claims 1 to 3, characterized in that: The box body includes a bottom plate and a cover plate which are arranged opposite to each other, and a side plate which is arranged between the bottom plate and the cover plate. The bottom plate, the side plate and the cover plate are combined to form a containing cavity, and the exhaust valve is arranged on the side plate.

8. The battery pack according to claim 7, characterized in that: The box body further includes a longitudinal beam, and a cross beam correspondingly arranged on both sides of the longitudinal beam, the two ends of the longitudinal beam are respectively connected to the side plates, and the two ends of the cross beam are respectively connected to the longitudinal beam and the side plates; The battery module is arranged in an area enclosed by the cross beam, the longitudinal beam and the side panels, and abuts against the cross beams on both sides.

9. The battery pack according to claim 8, characterized in that: The fan is arranged on the transverse beam or the longitudinal beam.

10. The battery pack according to claim 8, characterized in that: The battery pack further includes a controller, which is disposed in an area enclosed by the crossbeam, the longitudinal beam and the side panels and is separated from the battery module by the crossbeam.

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