Battery pack box body and battery pack

Abstract

The utility model discloses a battery pack box body and a battery pack, the battery pack box body comprises a plurality of first connecting beams and a plurality of second connecting beams, and the plurality of first connecting beams and the plurality of second connecting beams jointly enclose to form an accommodating space for placing single batteries; the first connecting beam comprises a deformation part and a connecting part, the deformation part is arranged at the end, close to the containing space, of the connecting part, the deformation part protrudes out of the connecting part, the connecting part is connected with the second connecting beams, and the deformation part is connected with the connecting part and protrudes out of the connecting part, so that the deformation part can deform and can be fixed between the two second connecting beams; an additional structure does not need to be designed to support or fix the deformation part, so that more single batteries can be placed in the accommodating space, and the energy density of the battery pack is further improved. When the single batteries extrude the deformation parts, the deformation parts protrude out of the connecting parts, so that the deformation parts can deform to bear and disperse force generated by thermal expansion of the single batteries, and the influence of thermal expansion on the battery pack box body is reduced.

Description

Technical Field

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

[0002] In the new energy sector, lithium batteries have become a crucial component of clean energy due to their high energy density and long cycle life. Their structural design is crucial for improving battery performance. The structure of a lithium battery includes a casing, single cells, connecting beams, a base plate, and a deformation beam.

[0003] During the charge and discharge process, the battery undergoes thermal expansion and compresses the deformation beam. The deformation beam, working in conjunction with the support beam, effectively absorbs and disperses the force generated by the thermal expansion of the individual cells, thereby reducing overall deformation of the housing. However, the presence of the support beam also occupies space within the housing intended for individual cells, which to some extent limits the improvement of the lithium battery's energy density. Utility Model Content

[0004] One purpose of the present invention is to provide a battery pack case and a battery pack, which are intended to solve the problem of improving the energy density of lithium batteries.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a solution: a battery pack case, which includes: a first connecting beam; a second connecting beam, a plurality of first connecting beams and a plurality of second connecting beams are sequentially spaced and connected to form a storage space for placing single batteries; the first connecting beam includes a deformation part, a connecting part and an installation part, the deformation part and the installation part are spaced apart, the deformation part is arranged at one end of the connecting part close to the storage space, and the deformation part protrudes from the connecting part, the installation part is arranged at one end of the connecting part away from the storage space, the connecting part is connected to the second connecting beam, and / or the installation part is connected to the second connecting beam.

[0006] Optionally, the battery pack case includes an explosion-proof valve, an exhaust channel is formed between the deformation part, the connecting part and the mounting part, the exhaust channel is connected to the accommodating space, and a passage connected to the exhaust channel is opened on the mounting part. The explosion-proof valve is installed on the side of the mounting part away from the deformation part and covers the passage. The explosion-proof valve is used to open under a preset pressure.

[0007] Optionally, the deformation portion is provided with a ventilation groove, one end of the ventilation groove is communicated with the accommodating space, and the other end is communicated with the exhaust channel.

[0008] Optionally, the first connecting beam is provided with a connecting hole, and the connecting hole is used to connect the passage and the exhaust passage.

[0009] Optionally, the distance between the deformation portion and the bottom of the exhaust channel is H1, the distance between the mounting portion and the bottom of the exhaust channel is H2, and 0.5≤H1 / H2≤0.8.

[0010] Optionally, the battery pack body includes a fixing assembly and a moisture-absorbing sheet arranged in the exhaust channel; the fixing assembly includes a fixing part and an elastic member, one end of the elastic member is connected to the first connecting beam, and the other end is connected to the fixing part, and the moisture-absorbing sheet is arranged between the fixing part and the first connecting beam.

[0011] Optionally, the installation package box includes a liquid cooling plate, the first connecting beam includes a welding portion, the welding portion is connected to the connecting portion, the welding portion is arranged at one end of the connecting portion close to the liquid cooling plate, and the area of ​​the liquid cooling plate facing the welding portion is welded to the connecting portion.

[0012] Optionally, the first connecting beam further includes a transition portion connected to the connecting portion, the transition portion and the mounting portion are located on opposite sides of the connecting portion, the transition portion and the connecting portion are surrounded to form a clearance groove, and part of the liquid cooling plate is arranged in the clearance groove.

[0013] Optionally, the two opposite end faces of the mounting portion form an obtuse angle with the length direction thereof, the two opposite end faces of the second connecting beam form an obtuse angle with the length direction thereof, and the end faces of the mounting portion are affixed to and connected to the end faces of the second connecting beam.

[0014] Optionally, the first connecting beam includes a reinforcing rib arranged in the deformable portion, the deformable portion is hollow, both ends of the reinforcing rib are respectively connected to the two opposite side walls of the deformable portion, and the reinforcing rib is arranged in a direction perpendicular to the side wall of the deformable portion.

[0015] Optionally, the box shell includes a sealing portion, which is provided at both ends of the first connecting beam, and the sealing portion is used to seal the opposite ends of the first connecting beam.

[0016] To achieve the above-mentioned purpose, the present invention provides a solution: a battery pack, comprising a plurality of single cells and any one of the above-mentioned battery pack boxes, wherein the plurality of single cells are placed in the battery pack box.

[0017] The beneficial effects of the present invention are as follows: both ends of the connecting portion are connected to the second connecting beams, and the deformable portion is connected to the connecting portion and is provided with a protruding connecting portion, so that the deformable portion can both deform and be fixed between the two second connecting beams, without the need for an additional structure to support or fix the deformable portion, thereby increasing the volume of the storage space, allowing the storage space to accommodate a larger number of single cells, thereby improving the energy density of the battery pack. When the single cells undergo thermal expansion during the charge and discharge process, the single cells squeeze the deformable portion. Because the deformable portion protrudes from the connecting portion, the deformable portion can deform to withstand and disperse the force generated by the thermal expansion of the single cells, thereby reducing the impact of the thermal expansion of the single cells on the overall shape of the battery pack case. The mounting portion is used to connect other structures of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0019] Figure 1 This is a schematic structural diagram of a battery pack box provided by an embodiment of the present utility model;

[0020] Figure 2 The embodiment of the present utility model provides Figure 1 A partial enlarged schematic diagram of area A in the middle;

[0021] Figure 3 This is a schematic diagram of the partial structure of one end of the first connecting beam provided in an embodiment of the present utility model;

[0022] Figure 4 The embodiment of the present utility model provides Figure 3 A partial enlarged schematic diagram of area B in the middle;

[0023] Figure 5 It is a cross-sectional schematic diagram provided in an embodiment of the present invention for displaying a fixing component.

[0024] Description of Figure Numbers:

[0025] 30. Box shell; 31. Liquid cooling plate; 32. First connecting beam; 321. Mounting portion; 3211. Aisle; 322. Deformation portion; 3221. Ventilation groove; 323. Connecting portion; 324. Exhaust channel; 325. Reinforcement rib; 326. Connecting hole; 327. Clearance groove; 328. Welding portion; 329. Transition portion; 33. Second connecting beam; 34. Accommodating space; 35. Sealing portion; 40. Explosion-proof valve; 50. Fixing assembly; 51. Fixing portion; 52. Elastic member; 60. Moisture-absorbing sheet. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only 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 ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] See also Figure 1 、 Figure 2 and Figure 3 As shown, Figure 1This is a schematic structural diagram of a battery pack box provided by an embodiment of the present utility model; Figure 2 The embodiment of the present utility model provides Figure 1 A partial enlarged schematic diagram of area A in the middle; Figure 3 It is a schematic diagram of the local structure of one end of the first connecting beam 32 provided in an embodiment of the present utility model.

[0028] The embodiment of the present invention provides a battery pack, comprising a battery pack case and a plurality of single cells placed inside the battery pack case.

[0029] Specifically, a battery pack case includes: a first connecting beam 32 and a second connecting beam 33, wherein a plurality of first connecting beams 32 and a plurality of second connecting beams 33 are sequentially spaced and connected to form a receiving space 34 for placing single batteries.

[0030] The first connecting beam 32 includes a deformation portion 322, a connecting portion 323 and an installation portion 321. The deformation portion 322 and the installation portion 321 are arranged at intervals. The deformation portion 322 is arranged at an end of the connecting portion 323 close to the accommodating space 34, and the deformation portion 322 protrudes from the connecting portion 323. The installation portion 321 is arranged at an end of the connecting portion 323 away from the accommodating space 34. The connecting portion 323 is connected to the second connecting beam 33, and / or the installation portion 321 is connected to the second connecting beam 33.

[0031] In actual use, both ends of the connecting portion 323 are connected to the second connecting beam 33. The deformable portion 322 is connected to the connecting portion 323 and protrudes from the connecting portion 323, allowing the deformable portion 322 to both deform and be fixed between the two second connecting beams 33. No additional structure is required to support or fix the deformable portion 322, thereby increasing the volume of the accommodating space 34, allowing the accommodating space 34 to accommodate a larger number or larger-sized single cells, thereby improving the energy density of the battery pack. When the single cells undergo thermal expansion during charging and discharging, they squeeze the deformable portion 322. Because the deformable portion 322 protrudes from the connecting portion 323, the deformable portion 322 can deform to withstand and distribute the force generated by the thermal expansion of the single cells, thereby reducing the impact of the thermal expansion of the single cells on the overall shape of the battery pack case. The mounting portion 321 is used to connect other structures of the battery pack.

[0032] In this embodiment, the first connecting beam 32 can be connected to the second connecting beam 33 via the connecting portion 323, the connecting portion 323 and the mounting portion 321, or the mounting portion 321. The first connecting beam 32 can be connected to the second connecting beam 33 by welding, bolting, adhesive bonding, or the like.

[0033] Further, if Figure 3and Figure 4 As shown, the battery pack case includes an explosion-proof valve 40, and an exhaust channel 324 is formed between the deformation portion 322, the connecting portion 323 and the mounting portion 321. The exhaust channel 324 is connected to the accommodating space 34, and a passage 3211 connected to the exhaust channel 324 is opened on the mounting portion 321. The explosion-proof valve 40 is installed on the side of the mounting portion 321 away from the deformation portion 322 and covers the passage 3211. The explosion-proof valve 40 is used to open under a preset pressure.

[0034] In actual applications, the battery pack may experience thermal runaway. Thermal runaway refers to the phenomenon in which the temperature of a single cell rises sharply due to a runaway chemical reaction inside the single cell. This is usually caused by a short circuit, overcharge, over-discharge, or an external high-temperature environment. When the temperature of the single cell rises to a certain level, it may cause the electrolyte to decompose, producing a large amount of flammable and explosive gases such as hydrogen and methane. The accumulation of these gases will increase the risk of battery pack explosion. When the battery pack experiences thermal runaway, the flammable and explosive gases in the storage space 34 enter the exhaust channel 324 and the aisle 3211. When the accumulation of flammable and explosive gases causes the air pressure in the aisle 3211 to reach the preset pressure of the explosion-proof valve 40, the explosion-proof valve 40 opens, and the flammable and explosive gases in the storage space 34 are discharged from the battery pack through the aisle 3211 and the exhaust channel 324, thereby controlling and mitigating the impact of thermal runaway and improving the overall safety of the battery pack.

[0035] In this embodiment, the exhaust channel 324 can be set as a continuous through structure along the length direction of the first connecting beam 32, or it can be set as multiple exhaust channels 324 at intervals. When multiple exhaust channels 324 are set at intervals, multiple explosion-proof valves 40 need to be set corresponding to each exhaust channel 324.

[0036] Further, if Figure 4 As shown, the deformation portion 322 defines a vent groove 3221 , one end of the vent groove 3221 is communicated with the accommodating space 34 , and the other end thereof is communicated with the exhaust passage 324 .

[0037] In practice, the vent grooves 3221 can increase the speed of gas flow between the storage space 34 and the exhaust passage 324. When thermal runaway causes a rapid increase in internal battery pressure, flammable and explosive gases can quickly enter the exhaust passage 324 and passageway 3211 through the vent grooves 3221, allowing the air pressure in the exhaust passage 324 and passageway 3211 to quickly reach the same level as the pressure in the storage space 34, allowing the explosion-proof valve 40 to promptly discharge the flammable and explosive gases.

[0038] In this embodiment, the deformation portion 322 can be provided with a plurality of ventilation grooves 3221 spaced apart along its own length direction, and the ventilation grooves 3221 pass through the deformation portion 322; the ventilation grooves 3221 can also be a continuous through structure and be opened along the length direction of the deformation portion 322. In this case, the ventilation grooves 3221 cannot pass through the deformation portion 322, otherwise the contact area between the deformation portion 322 and the single battery will be greatly reduced, thereby greatly reducing the ability of the deformation portion 322 to withstand the thermal expansion of the single battery, which may easily cause the deformation portion 322 to fail.

[0039] Alternatively, as Figure 4 As shown, the first connecting beam 32 defines a communication hole 326 , which is used to connect the passage 3211 and the exhaust passage 324 .

[0040] In actual application, the connecting hole 326 can increase the flow rate of the gas between the exhaust channel 324 and the passage 3211. When thermal runaway causes the internal pressure of the battery to increase rapidly, flammable and explosive gases can quickly enter the exhaust channel 324 and the passage 3211 through the connecting hole 326, so that the air pressure of the exhaust channel 324 and the passage 3211 can quickly be consistent with the air pressure of the accommodating space 34, so that the explosion-proof valve 40 can discharge flammable and explosive gases in time.

[0041] In this embodiment, the connecting hole 326 is a circular hole and is spaced apart in the mounting portion 321 along the length direction of the mounting portion 321 . The connecting hole 326 can also be a waist hole or a special-shaped hole. The connecting hole 326 can also be a continuous through structure opened along the length direction of the first connecting beam 32 .

[0042] Alternatively, as Figure 5 As shown, the distance between the deformation portion 322 and the bottom of the exhaust channel 324 is H1, the distance between the mounting portion 321 and the bottom of the exhaust channel 324 is H2, and 0.5≤H1 / H2≤0.8.

[0043] In practice, the connection portion 323 is connected to other battery pack structures via the sidewalls of the mounting portion 321, and the end face of the mounting portion 321 is connected to the end face of the second connecting beam 33. A larger H2 indicates a stronger connection between the mounting portion 321 and other battery pack structures, as well as the second connecting beam 33. When a single battery cell thermally expands and compresses the deformable portion 322, the cell primarily compresses the end of the deformable portion 322 away from the connection portion 323. A larger H1 indicates a greater torque applied to the connection portion 323 and the mounting portion 321.

[0044] In this embodiment, the value of H1 / H2 can be 0.55, 0.65, 0.7, or 0.75. Within this range, the mounting portion 321 can improve the structural strength of the first connecting beam 32 and the overall structural strength of the first connecting beam 32 in the battery pack, the first connecting beam 32, and the second connecting beam 33.

[0045] Alternatively, as Figure 5 As shown, the battery pack body includes a fixing assembly 50 and a moisture-absorbing sheet 60 arranged in the exhaust channel 324; the fixing assembly 50 includes a fixing portion 51 and an elastic member 52, one end of the elastic member 52 is connected to the first connecting beam 32, and the other end is connected to the fixing portion 51, and the moisture-absorbing sheet 60 is arranged between the fixing portion 51 and the first connecting beam 32.

[0046] In practice, the moisture-absorbing sheet 60 absorbs moisture from the battery pack, maintaining a dry environment and reducing the risk of short circuits and reduced insulation performance. To secure the moisture-absorbing sheet 60, the fixing portion 51 is first moved away from the connecting portion 323 and held in a position where the distance between the fixing portion 51 and the connecting portion 323 is greater than the thickness of the moisture-absorbing sheet 60. The elastic member 52 then deforms, inserting the moisture-absorbing sheet 60 between the fixing portion 51 and the connecting portion 323. The fixing portion 51 is then released, allowing the elastic member 52 to recover its shape and move the fixing portion 51 toward the connecting portion 323, securing the moisture-absorbing sheet 60 by clamping the fixing portion 51 and the connecting portion 323.

[0047] In this embodiment, the elastic member 52 may be a coil spring, or a rubber spring, etc. The material of the moisture absorbing sheet 60 may be a polymer water absorbing resin, or silica gel, calcium chloride, etc.

[0048] In one embodiment, if Figure 5 As shown, the installation package housing includes a liquid cooling plate 31, and the first connecting beam 32 includes a welding portion 328, which is connected to the connecting portion 323. The welding portion 328 is provided at the end of the connecting portion 323 near the liquid cooling plate 31. The area of ​​the liquid cooling plate 31 facing the welding portion 328 is welded to the connecting portion 323. In this embodiment, the cross-sectional shape of the welding portion 328 can be triangular, rectangular, circular, or fan-shaped, and the welding process can be friction stir welding, laser welding, electron beam welding, resistance welding, or the like.

[0049] In practice, the liquid cooling plate 31 is connected to the area of ​​the connection portion 323 facing the welding portion 328 via friction stir welding. Friction stir welding utilizes a special welding tool that rotates and moves linearly at high speed between the two materials to be welded, generating frictional heat and plastic deformation within the materials, resulting in a fusion weld. During welding, the welding portion 328 provides a support for the welding tool and enhances the structural strength of the weld on the connection portion 323, minimizing deformation of the connection portion 323.

[0050] Further, if Figure 4As shown, the first connecting beam 32 also includes a transition portion 329 connected to the connecting portion 323. The transition portion 329 and the mounting portion 321 are located on opposite sides of the connecting portion 323. The transition portion 329 and the connecting portion 323 are surrounded to form a clearance groove 327, and part of the liquid cooling plate 31 is arranged in the clearance groove 327.

[0051] In actual application, the liquid cooling plate 31 can effectively manage the heat generated during battery operation. First, the liquid cooling plate 31 is inserted into the clearance groove 327, and the liquid cooling plate 31 is abutted against the transition portion 329. Then, the liquid cooling plate 31 is connected to the first connecting beam 32 and the second connecting beam 33 by welding. The clearance groove 327 can provide space for accommodating the liquid cooling plate 31, reducing the space occupied by the liquid cooling plate 31 and achieving compact integration of the liquid cooling plate 31 and the battery pack structure. The transition portion 329 can also facilitate the positioning of the liquid cooling plate 31, thereby improving the assembly efficiency of the liquid cooling plate 31 and, in turn, improving the production efficiency of the battery pack.

[0052] In one embodiment, if Figure 2 As shown, when the mounting portion 321 is connected to the second connecting beam 33, the opposite end faces of the mounting portion 321 form an obtuse angle with its length direction, and the opposite end faces of the second connecting beam 33 form an obtuse angle with its length direction, and the end faces of the mounting portion 321 are attached to and connected to the end faces of the second connecting beam 33.

[0053] In actual applications, the end surface of the mounting portion 321 is aligned with the end surface of the adjacent second connecting beam 33, and then connected to the end surface of the adjacent second connecting beam 33 by welding or other connection methods. This structure can disperse stress on the material, reduce weak tension points, thereby enhancing structural stability, and increase the connection area between the mounting portion 321 and the second connecting beam 33, making welding or other types of bonding more secure.

[0054] In this embodiment, the connection between the end surface of the mounting portion 321 and the end surface of the second connecting beam 33 may be by welding or bonding.

[0055] In one embodiment, if Figure 5 As shown, the first connecting beam 32 includes a plurality of reinforcing ribs 325 arranged in the deformation portion 322. The plurality of reinforcing ribs 325 are arranged at intervals along the direction of the side wall of the deformation portion 322. The deformation portion 322 is hollow. The two ends of the reinforcing ribs 325 are respectively connected to the two side walls opposite to the deformation portion 322. The reinforcing ribs 325 are arranged in a direction perpendicular to the side wall of the deformation portion 322.

[0056] In actual applications, when a single battery undergoes thermal expansion, the hollowness of the deformable portion 322 can increase the deformation of the deformable portion 322. The reinforcing ribs 325 can enhance the structural strength of the deformable portion 322 and reduce the possibility of excessive deformation of the deformable portion 322. When the single battery compresses the deformable portion 322, the force acting on the deformable portion 322 is directed perpendicular to the sidewalls of the deformable portion 322. The reinforcing ribs 325 are arranged perpendicular to the sidewalls of the deformable portion 322, so that the length of the reinforcing ribs 325 is parallel to the direction of the force acting on the deformable portion 322, thereby enabling the reinforcing ribs 325 to better withstand the force acting on the deformable portion 322.

[0057] Further, if Figure 2 As shown, the battery pack body includes a sealing portion 35 , which is provided at both ends of the first connecting beam 32 . The sealing portion 35 is used to seal the opposite ends of the first connecting beam 32 .

[0058] In practice, after the first connecting beam 32 and the second connecting beam 33 are connected, holes for various purposes are opened in the first connecting beam 32 to improve hole positioning accuracy. When opening the holes, chips may enter the cavity within the first connecting beam 32. The sealing portion 35 seals the cavity within the first connecting beam 32, thereby reducing the risk of chips entering the accommodation space 34 through the first connecting beam 32.

[0059] In this embodiment, the material of the sealing portion 35 may be structural adhesive, or may be insulating fluororubber, microporous elastomer, or other materials.

[0060] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship and movement status of the various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0061] It should also be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element through an intervening element.

[0062] In addition, the descriptions of "first," "second," etc. in this utility model are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0063] The above are only preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the utility model concept, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A battery pack box, characterized in that: include: a first connecting beam; A second connecting beam, a plurality of first connecting beams and a plurality of second connecting beams are sequentially spaced and connected to form a receiving space for placing single batteries; The first connecting beam includes a deformation portion, a connecting portion and an installation portion, the deformation portion and the installation portion are arranged at intervals, the deformation portion is arranged at an end of the connecting portion close to the accommodating space, and the deformation portion protrudes from the connecting portion, the installation portion is arranged at an end of the connecting portion away from the accommodating space, the connecting portion is connected to the second connecting beam, and / or the installation portion is connected to the second connecting beam.

2. The battery pack case according to claim 1, characterized in that: The battery pack case includes an explosion-proof valve. An exhaust channel is formed between the deformation part, the connecting part and the mounting part. The exhaust channel is connected to the accommodating space. An aisle connected to the exhaust channel is opened on the mounting part. The explosion-proof valve is installed on the side of the mounting part away from the deformation part and covers the aisle. The explosion-proof valve is used to open under a preset pressure.

3. The battery pack case according to claim 2, characterized in that: The deformation portion is provided with a ventilation groove, one end of the ventilation groove is communicated with the accommodating space, and the other end is communicated with the exhaust channel.

4. The battery pack case according to claim 2, characterized in that: The first connecting beam is provided with a communicating hole, and the communicating hole is used to connect the passage and the exhaust passage.

5. The battery pack case according to claim 2, characterized in that: The distance between the deformation portion and the bottom of the exhaust channel is H1, the distance between the mounting portion and the bottom of the exhaust channel is H2, and 0.5≤H1 / H2≤0.

8.

6. The battery pack case according to claim 2, characterized in that: The battery pack box includes a fixing assembly and a moisture absorbing sheet arranged in the exhaust channel; The fixing assembly includes a fixing part and an elastic member, one end of the elastic member is connected to the first connecting beam, and the other end is connected to the fixing part, and the moisture-absorbing sheet is arranged between the fixing part and the first connecting beam.

7. The battery pack case according to claim 1, characterized in that: The battery pack body includes a liquid cooling plate, the first connecting beam includes a welding portion, the welding portion is connected to the connecting portion, the welding portion is arranged at one end of the connecting portion close to the liquid cooling plate, and the area of ​​the liquid cooling plate facing the welding portion is welded to the connecting portion.

8. The battery pack case according to claim 7, characterized in that: The first connecting beam also includes a transition portion connected to the connecting portion. The transition portion and the mounting portion are located on opposite sides of the connecting portion. The transition portion and the connecting portion are surrounded to form a clearance groove, and part of the liquid cooling plate is arranged in the clearance groove.

9. The battery pack case according to claim 1, characterized in that: The opposite end faces of the mounting portion and the second connecting beam form an obtuse angle with the longitudinal direction, and the end faces of the mounting portion and the end faces of the second connecting beam are attached and connected.

10. The battery pack case according to claim 1, characterized in that: The first connecting beam includes a reinforcing rib arranged in the deformable portion. The deformable portion is hollow. Both ends of the reinforcing rib are respectively connected to two opposite side walls of the deformable portion. The reinforcing rib is arranged in a direction perpendicular to the side walls of the deformable portion.

11. The battery pack case according to claim 10, characterized in that: The battery pack body includes a sealing portion, which is arranged at both ends of the first connecting beam and is used to seal the opposite ends of the first connecting beam.

12. A battery pack, characterized in that: The invention comprises a plurality of single cells and a battery pack case according to any one of claims 1 to 11, wherein the plurality of single cells are placed in the battery pack case.

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