Battery pack

Abstract

The battery pack comprises a box body, a plurality of partition plates and a plurality of battery cell modules, the box body is provided with a containing cavity, an air inlet and an air outlet, the air inlet and the air outlet are communicated with the containing cavity, the partition plates are arranged in the containing cavity and divide the containing cavity into a plurality of battery bins, the partition plates are provided with ventilation openings, and the ventilation openings are communicated with the adjacent battery bins. A plurality of battery cell modules are respectively arranged in different battery cabins, and the power of the battery cell modules is sequentially reduced in the direction from an air inlet to an air outlet, so that the technical problem of how to homogenize the temperature of each area in a battery pack is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery heat dissipation technical field especially relates to a battery pack. BACKGROUND

[0002] With the popularity of energy storage systems, battery technology, especially the design of battery packs, has become the focus. In the battery pack, the battery module is the core component, and its performance directly affects the safety, energy efficiency and life of the entire battery pack. Modern battery pack design usually uses air cooling systems or liquid cooling systems for temperature control to ensure that the battery module is within a safe temperature range during operation. However, the traditional air duct structure often faces the problem of uneven heat dissipation efficiency in actual application.

[0003] The existing air duct design usually relies on simple fans or cooling channel layouts to guide cool air through the battery module. Due to the different flow directions and flow rates of the air flow, there is a large difference in the heat dissipation effect of different areas, which in turn causes uneven temperature distribution inside the battery pack. Especially in some areas of the battery pack, the air flow is difficult to effectively cover or the flow rate is too low, causing the temperature in these areas to be significantly higher than in other areas. Long-term temperature unevenness can cause battery failure, and even cause battery overheating, expansion, or serious safety accidents such as thermal runaway.

[0004] Therefore, how to make the temperature of each area in the battery pack uniform has become a technical problem that needs to be solved in battery pack design. SUMMARY

[0005] One purpose of the utility model is to provide a battery pack, which aims to solve the technical problem of how to make the temperature of each area in the battery pack uniform.

[0006] To achieve the above purpose, the utility model provides a scheme: a battery pack, the battery pack includes a box body, an accommodating cavity is opened, and an air inlet and an air outlet are communicated with the accommodating cavity; a plurality of partition plates are arranged in the accommodating cavity, which separates the accommodating cavity into a plurality of battery compartments, the partition plate is provided with a ventilation opening, and the ventilation opening is communicated with the adjacent battery compartment; a plurality of battery cell modules are arranged in different battery compartments, and the power of the battery cell modules decreases in turn from the air inlet to the air outlet.

[0007] Optionally, the partition plate includes a first partition plate and a second partition plate, the extension direction of the first partition plate is along the first direction, the extension direction of the second partition plate is along the second direction, the first partition plate and the second partition plate are both provided with ventilation openings, the first partition plate and the second partition plate are crossed with each other, the accommodating cavity forms a first flow channel along the first direction and a second flow channel along the second direction, and the first flow channel and the second flow channel are alternately arranged; the first direction is from the air inlet to the air outlet, the second direction is perpendicular to the first direction and parallel to the horizontal plane.

[0008] Optionally, the battery cell module comprises a plurality of battery cells arranged along a thickness direction of the battery cells, and the thickness direction of the battery cells is parallel to the first direction.

[0009] Optionally, the battery pack further comprises a baffle arranged in the accommodating cavity, and the baffle is arranged to be inclined with respect to the first direction and the second direction.

[0010] Optionally, the battery pack further comprises a hinge structure, the baffle comprises opposite fixed ends and free ends and a guide surface connecting the fixed ends and the free ends, the fixed ends are hingedly connected to the inner wall of the box through the hinge structure, and the guide surface is arranged to be inclined with respect to the first direction and the second direction.

[0011] Optionally, the partition plates are distributed along the first direction and are parallel to each other, and the first direction is from the air inlet to the air outlet; the battery cell module comprises a plurality of battery cells arranged along a thickness direction of the battery cells, and the thickness direction of the battery cells is perpendicular to the first direction.

[0012] Optionally, the battery pack further comprises a flow guide plate arranged in the accommodating cavity and connected to the box; the flow guide plate comprises a plurality of fins distributed along the direction from the air inlet to the air outlet, one end of the fin is connected to the inner wall of the box, and the fin is arranged at an angle with respect to the first direction.

[0013] Optionally, in the direction from the air inlet to the air outlet, the angle between the plurality of fins and the first direction gradually increases.

[0014] Optionally, the battery pack further comprises an isolation assembly; the isolation assembly comprises a blocking plate and a fuse, and the fuse connects the blocking plate and the box; when the temperature of the fuse exceeds a threshold value, the fuse is fused, and the blocking plate seals the air vent.

[0015] Optionally, the isolation assembly further comprises a limiting piece, the blocking plate and the limiting piece are arranged at opposite ends of the air vent, and the limiting piece is used to bear the blocking plate after the fuse is broken.

[0016] The beneficial effects of the utility model lie in:

[0017] Compared with the prior art, the box accommodating cavity is divided into a plurality of battery compartments by the partition plates for preventing the battery cell module, and the battery cell module is communicated by the air vent, the air inlet and the air outlet to form a continuous cold flow channel, wherein the battery cell modules are arranged in power order, i.e., along the direction of the cooling air flow, the power of the battery cell modules gradually decreases, which matches the phenomenon that the cooling efficiency in the air duct gradually changes, so that the heat dissipation efficiency of each battery compartment and the heating power are coordinated with each other, the situation that the temperature of some battery compartments is too high due to uneven heat dissipation is avoided, and the temperature distribution is balanced. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are only some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative labor.

[0019] Figure 1 is a battery pack overall schematic diagram provided by the embodiment of the present application,

[0020] Figure 2 is a battery pack overall schematic diagram provided by the embodiment of the present application, Figure 1 is a cross-sectional view along the horizontal plane direction,

[0021] Figure 3 is another battery pack overall schematic diagram provided by the embodiment of the present application,

[0022] Figure 4 is a battery pack overall schematic diagram provided by the embodiment of the present application, Figure 3 is a cross-sectional view along the horizontal plane direction,

[0023] Figure 5 is a schematic diagram of the isolation assembly structure provided by the embodiment of the present application.

[0024] Explanation of reference numerals:

[0025] 10, box; 101, containing cavity; 102, air inlet; 103, air outlet; 104, battery compartment; 20, partition plate; 201, ventilation opening; 21, first partition plate; 22, second partition plate; 23, first flow channel; 24, second flow channel; 30, battery cell module; 301, battery cell; 40, air deflector; 401, fixed end; 402, guide surface; 403, free end; 50, hinge structure; 60, drainage plate; 601, fin; 70, isolation assembly; 701, blocking plate; 702, fuse; 703, limiting piece. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] Please refer to Figure 1 and Figure 2 , Figure 1 is a battery pack overall schematic diagram provided by the embodiment of the present application,Figure 2 is an embodiment of the utility model Figure 1 The cross section along the horizontal plane direction. Figure 2 The middle A direction is the first direction, and the B direction is the second direction.

[0028] The utility model scheme provides a kind of battery pack, including box 10, multiple partition plate 20 and multiple electric core module 30, wherein, the box 10 of battery pack is overall shell, is equipped with containing cavity 101, containing cavity 101 can accommodate multiple electric core module 30.In order to realize the effective management of battery pack internal temperature, box 10 is also equipped with with containing cavity 101 intercommunication air inlet 102 and air outlet 103, air inlet 102 introduces cooling air into box 10, and air outlet 103 is used to discharge the hot air after cooling, to form cooling air flow passage.Cooling air enters after passing air inlet 102, flows along the air duct in battery compartment 104, and is discharged at air outlet 103.

[0029] Containing cavity 101 is installed multiple partition plate 20, partition plate 20 not only plays mechanical support effect, but also divides containing cavity 101 into multiple battery compartment 104.Each battery compartment 104 is placed with one electric core module 30 respectively.Partition plate 20 is equipped with vent 201, and vent 201 is used to connect adjacent battery compartment 104, so that cooling wind can flow between each battery compartment 104, form a continuous cold flow channel.The setting of cold flow channel effectively promotes the flow of cooling air between battery compartment 104, and improves the overall heat dissipation efficiency of battery pack.

[0030] It is worth noting that the heating power of electric core module 30 is not same, and specific placement order is adopted.In the flow direction from air inlet 102 to air outlet 103, the power of electric core module 30 gradually reduces.Specifically, the electric core module 30 on the side of air inlet 102 has larger heating power, and the electric core module 30 on the side of air outlet 103 has smaller heating power.Cooling wind can maintain the balance of temperature distribution under the influence of the different heating power of electric core module 30 in different battery compartment 104 when flowing through each battery compartment 104.

[0031] In the embodiment, electric core module 30 is arranged according to power sequence, which matches the phenomenon that cooling efficiency in air duct gradually changes.As cooling wind flows through each battery compartment 104, the heat dissipation efficiency of air duct often reduces due to the gradual weakening of air flow.However, due to the reasonable distribution of the power of electric core module 30, i.e., the power of electric core module 30 gradually reduces from the side of air inlet 102 to the side of air outlet 103, the temperature of cooling air is naturally reasonably adjusted when flowing through battery compartment 104, so that the heat dissipation efficiency of each battery compartment 104 and the heating power are coordinated with each other, avoiding the situation that the temperature of part of battery compartment 104 is too high due to uneven heat dissipation.

[0032] In some embodiments, the partition plate 20 comprises a first partition plate 21 and a second partition plate 22, the first partition plate 21 extends along a first direction, and the second partition plate 22 extends along a second direction, the first direction is the flow direction from the air inlet 102 to the air outlet 103, i.e. the main flow direction of the cooling air; the second direction is perpendicular to the first direction and parallel to the horizontal plane. Moreover, the first partition plate 21 and the second partition plate 22 are both provided with air vents 201, and the first partition plate 21 and the second partition plate 22 intersect with each other, so that the accommodation cavity 101 forms a first flow channel 23 along the first direction and a second flow channel 24 along the second direction, and the first flow channel 23 and the second flow channel 24 are arranged alternately.

[0033] In the present embodiment, the flow channel layout in the present embodiment fully considers the cooling efficiency of the cooling air and the heat dissipation requirement inside the battery pack, and optimizes the space utilization of the accommodation cavity 101. The first partition plate 21 and the second partition plate 22 intersect with each other, forming a grid-shaped battery compartment 104 layout, and each battery compartment 104 is connected with the adjacent battery compartment 104 through the air vents 201 on the partition plate 20, forming the first flow channel 23 and the second flow channel 24 arranged alternately. This alternative arrangement enables the cooling air to flow smoothly through a series of longitudinal and transverse flow channels, connecting all the battery compartments 104, thereby forming a continuous cooling flow channel from the air inlet 102 to the air outlet 103.

[0034] This flow channel layout not only optimizes the use of the internal space of the battery pack, but also prolongs the path of the cooling air flowing through the battery compartment 104, thereby improving the heat exchange effect. Specifically, the cooling air can fully contact the cell module 30 when flowing through each battery compartment 104, and carry away the heat generated by the cell module 30, thereby effectively reducing the temperature of the cell module 30.

[0035] Further, the cell module 30 comprises a plurality of cells 301, and the plurality of cells 301 are arranged along the thickness direction of the cells 301, and the thickness direction of the cells 301 is parallel to the first direction. The cooling air can effectively cover the entire surface of the cells 301 and carry away the heat generated on the surface of the cells 301.

[0036] In the present embodiment, the cell module 30 is composed of a plurality of individual cells 301, and the cells 301 are arranged along the thickness direction in the module. The thickness direction of the cells 301 is parallel to the first direction of the cooling air flow, i.e. the path of the cooling air flow is perpendicular to the larger surface of the cells 301. Since the cooling air directly flows through the larger surface of the cells 301 and fully contacts the surface of the cells 301, the heat exchange efficiency is greatly improved.

[0037] Further, to improve the flow of cooling air in the flow channel, the battery pack further comprises a guide vane 40, which is arranged in the accommodation cavity 101 and fixedly connected with the inner wall of the box 10. The guide vane 40 is arranged to be inclined with respect to the first direction and the second direction, respectively, to guide the cooling air to flow towards the air vent 201 or the air outlet 103.

[0038] In this embodiment, the guide vane 40 is designed to optimize the flow path of the cooling air in the battery pack. After entering the accommodation cavity 101, the cooling air is often restricted by the structure of the flow channel, which may cause uneven flow or excessive resistance, thereby affecting the heat dissipation effect. Therefore, the guide vane 40 is arranged in the accommodation cavity 101 to guide the air flow, reduce air resistance and increase air flow speed.

[0039] The inclined arrangement of the guide vane 40 enables the cooling air to flow more smoothly along the predetermined direction, avoiding turbulence and dead angle areas in the accommodation cavity 101. Specifically, the guide vane 40 is inclined with respect to the first direction and the second direction, respectively. This design of inclination angle ensures that the cooling air can flow more smoothly when flowing through each battery compartment 104. By guiding the air flow towards the air vent 201 or the air outlet 103, the guide vane 40 helps the cooling air to pass through the battery module more efficiently, thereby improving the heat dissipation effect.

[0040] Further, to increase the adaptability of the battery pack, the battery pack further comprises a hinge structure 50, and the guide vane 40 comprises opposite fixed ends 401 and free ends 403, and a guide surface 402 connecting the fixed ends 401 and the free ends 403. The fixed ends 401 are hingedly connected with the inner wall of the box 10 through the hinge structure 50, and the guide surface 402 is arranged to be inclined with respect to the first direction and the second direction, respectively. The hinge structure 50 enables the guide vane 40 to have high flexibility, which can be adjusted according to different working conditions and heat dissipation requirements.

[0041] In this embodiment, the battery pack is provided with the hinge structure 50, so that the guide vane 40 can adjust the angle as needed. Specifically, the fixed ends 401 of the guide vane 40 are connected with the inner wall of the box 10 through the hinge structure 50. The hinge enables the guide vane 40 to rotate or incline around the fixed ends 401, adjust the angle between the guide vane 40 and the flow direction of the cooling air, and thereby optimize the guidance of air flow.

[0042] The guide surface 402 of the air deflector 40 is a part connecting the fixed end 401 and the free end 403, which directly affects the flow path of the cooling air. The inclination of the guide surface 402 relative to the first direction and the second direction is arranged so that the cooling air can flow more effectively, ensuring that the airflow flows along the predetermined path to the air vents 201 or the air outlets 103 of each battery compartment 104. By adjusting the angle of the air deflector 40, the smoothness of the air duct and the airflow speed can be optimized, ensuring that the cooling air can cover the entire battery pack.

[0043] In a high-load or high-temperature environment, the heat dissipation demand in the battery pack is large, and the air deflector 40 can be adjusted to a larger angle to increase the flow amount and flow rate of the cooling air, thereby improving the heat dissipation efficiency. Conversely, in a lower load or low-temperature environment, the air deflector 40 can be adjusted to a smaller angle to avoid excessive cooling air from taking away unnecessary heat, thereby ensuring that the temperature of the battery pack remains within a reasonable range.

[0044] Please refer to Figure 3 and Figure 4 , Figure 3 is another overall schematic view of a battery pack provided by an embodiment of the present application, Figure 4 is a perspective view of a battery pack provided by an embodiment of the present application, Figure 3 is a cross-sectional view along the horizontal direction, Figure 4 In some embodiments, the partition plate 20 adopts a parallel arrangement along the first direction, and the battery cell module 30 includes a plurality of battery cells 301 arranged along the thickness direction of the battery cell module 30, and the thickness direction of the battery cell 301 is perpendicular to the first direction.

[0045] In this embodiment, the partition plate 20 adopts a parallel arrangement along the first direction to divide the accommodation cavity 101 into a plurality of battery compartments 104. Since the partition plates 20 are arranged in parallel along the first direction, the cooling air can flow through each battery compartment 104 in turn along a straight flow channel after entering the air inlet 102, and finally be discharged from the air outlet 103. The straight flow channel design ensures that the cooling air maintains a stable flow direction during the flow process, reduces the airflow speed decay caused by irregular or curved air duct structures, thereby effectively maintaining the speed and flow of the cooling air and improving the overall heat dissipation efficiency.

[0046] Meanwhile, the plurality of battery cells 301 in the battery cell module 30 are arranged along their thickness direction, and the thickness direction of the battery cells 301 is perpendicular to the first direction. That is, the cooling air will cross the surface of each battery cell 301 from the side of the battery cell 301 when flowing through the battery compartment 104. And since there are gaps between the battery cells 301, the cooling air can pass through the gaps, increasing the contact area between the cooling air and the surface of the battery cells 301, thereby more effectively removing heat from the battery cells 301 and improving the overall heat exchange efficiency.

[0047] Further, in order to optimize the flow path of the cooling air and improve the heat dissipation efficiency, the battery pack further comprises a flow guide plate 60, which is arranged in the accommodation cavity 101 and connected with the box body 10. The flow guide plate 60 comprises a plurality of fins 601, which are distributed along the direction from the air inlet 102 to the air outlet 103, and one end of the fin 601 is connected with the inner wall of the box body 10, and the fin 601 is arranged at an angle with the first direction.

[0048] In this embodiment, the flow guide plate 60 is installed in the accommodation cavity 101 and connected with the inner wall of the box body 10, aiming to guide the flow of the cooling air, improve the contact effect between the cooling air and the surface of the battery cells 301, and improve the overall heat dissipation performance. The key component of the flow guide plate 60 is the plurality of fins 601, which are distributed along the flow direction from the air inlet 102 to the air outlet 103, and the fin 601 is arranged at an angle with the first direction, so that when the cooling air passes through the flow guide plate 60, the flow trajectory of the cooling air is optimized, so that the airflow can be more efficiently guided to the battery cell module 30, and more contact and heat exchange with the battery cell module 30 occurs, thereby avoiding the local retention or dead angle phenomenon of the cooling air.

[0049] Further, in the direction from the air inlet 102 to the air outlet 103, the inclination angle of the plurality of fins 601 with the first direction gradually increases.

[0050] In this embodiment, the fins 601 have a gradually changing inclination angle in distribution to optimize the flow path of the cooling air. Specifically, along the flow direction from the air inlet 102 to the air outlet 103, the inclination angle between the plurality of fins 601 and the first direction gradually increases. As the cooling air enters the accommodation cavity 101 from the air inlet 102, it will gradually contact the first group of fins 601. Initially, the inclination angle of the fin 601 with the first direction is small, which helps to guide the initial airflow, so that the cooling air can smoothly enter each part of the battery compartment 104. As the cooling air continues to flow and contacts more fins 601, the inclination angle of the plurality of fins 601 gradually increases, which gradually adjusts the flow direction of the cooling air, forming a more dispersed airflow path. The larger inclination angle helps to change the flow direction of the airflow and more effectively guide the cooling air to each area of the battery compartment 104, avoiding uneven heat dissipation caused by airflow flowing too fast through some areas.

[0051] In addition, the gradually increasing inclination angle makes the flow path of the cooling air inside the battery pack smoother, and the airflow is not affected by sudden turning or changes in resistance, effectively avoiding local airflow stagnation and reducing vortex phenomena of the cooling air.

[0052] Referring to Figure 5 , Figure 5 is a structural schematic diagram of the isolation assembly 70 provided in the embodiments of the present application. In some embodiments, in order to improve the safety of the battery pack, especially when the battery overheats, short-circuits or other abnormal conditions occur, the battery pack introduces an isolation assembly 70, which includes a blocking plate 701 and a fuse 702. The fuse 702 connects the blocking plate 701 and the box 10. When the temperature of the fuse 702 exceeds a threshold value, the fuse 702 will melt, causing the blocking plate 701 to seal the air vent 201, forming an effective physical isolation barrier to prevent the spread of fire inside the battery pack.

[0053] In the present embodiment, the isolation assembly 70 of the battery pack provides a highly effective safety protection mechanism through the cooperation of the fuse 702 and the blocking plate 701. When the temperature inside the battery pack rises to a certain critical value due to overheating, short-circuiting or other fault conditions, the fuse 702 will melt due to heat, immediately cutting off the connection between the blocking plate 701 and the battery pack box 10. This action will cause the blocking plate 701 to quickly close the air vent 201, thereby forming an isolation barrier to physically isolate the faulty battery compartment 104 from other normally operating battery compartments 104, preventing the spread of fire or harmful gases from the faulty battery compartment 104 to other areas, thereby protecting the safety of other battery cell modules 30 inside the battery pack and reducing the impact of the accident on the entire battery pack.

[0054] Furthermore, in the present embodiment, the plurality of battery cell modules 30 inside the battery pack are independently powered. Each battery cell module 30 has an independent electrical circuit and power management system, so even if part of the battery cell modules 30 fail or fail, the other battery cell modules 30 can continue to operate normally. Through the use of isolation measures such as the fuse 702 and the blocking plate 701, the independence between the faulty battery compartment 104 and the normal battery compartment 104 is further guaranteed, ensuring the continuous working ability of the battery pack.

[0055] Further, the isolation assembly 70 not only includes the fuse 702 and the blocking plate 701, but also includes a limiting piece 703 to further improve the stability and safety of the system. The blocking plate 701 and the limiting piece 703 are respectively arranged at opposite ends of the air vent 201, and the limiting piece 703 is used to bear the blocking plate 701 after the fuse 702 breaks.

[0056] In the embodiment, the limiting members 703 are used in cooperation with the blocking plates 701, and are arranged at opposite ends of the ventilation openings 201, and the limiting members 703 function to ensure that the blocking plates 701 can accurately and stably close the ventilation openings 201 after the fusing members 702 are broken. Specifically, when the battery pack is overheated or other faults cause the fusing members 702 to melt, the blocking plates 701 will immediately be disconnected from the original connection state and begin to close the ventilation openings 201. At this time, the blocking plates 701 will move quickly to close the ventilation openings 201 to isolate the faulty battery compartment 104. The limiting members 703 will ensure that the blocking plates 701 maintain the correct position during movement, avoiding poor closing effect due to uneven force or movement trajectory deviation.

[0057] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture, and if the specific posture changes, the directional indications will also change accordingly.

[0058] It should also be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or can have a middle element present at the same time. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or can be indirectly connected to the other element through a middle element.

[0059] In addition, the descriptions involving "first", "second", etc. in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of a person skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0060] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made by using the contents of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A battery pack, characterized by, The battery pack comprises: a box body, which is provided with a receiving cavity, an air inlet and an air outlet connected with the receiving cavity; a plurality of partition plates arranged in the receiving cavity and separating the receiving cavity into a plurality of battery compartments, the partition plates being provided with air vents, and the air vents being connected with adjacent battery compartments; a plurality of battery cell modules arranged in different battery compartments, and the power of the battery cell modules gradually decreases in the air flow direction from the air inlet to the air outlet.

2. The battery pack of claim 1, wherein, The partition plates comprise a first partition plate and a second partition plate, the first partition plate extends along a first direction, the second partition plate extends along a second direction, the first partition plate and the second partition plate are both provided with the air vents, the first partition plate and the second partition plate intersect with each other, the receiving cavity is formed with a first flow channel along the first direction and a second flow channel along the second direction, and the first flow channel and the second flow channel are alternately arranged. The first direction is from the air inlet to the air outlet, and the second direction is perpendicular to the first direction and parallel to a horizontal plane.

3. The battery pack of claim 2, wherein, The battery cell module comprises a plurality of battery cells arranged along the thickness direction of the battery cells, and the thickness direction of the battery cells is parallel to the first direction.

4. The battery pack of claim 2, wherein, The battery pack further comprises a baffle plate arranged in the receiving cavity, and the baffle plate is arranged obliquely relative to the first direction and the second direction.

5. The battery pack of claim 4, wherein, The baffle plate comprises opposite fixed ends and free ends and a guide surface connecting the fixed ends and the free ends, the fixed ends are hinged to the inner wall of the box body through the hinge structure, and the guide surface is arranged obliquely relative to the first direction and the second direction.

6. The battery pack of claim 1, wherein, The partition plates are distributed along the first direction and parallel to each other, and the first direction is from the air inlet to the air outlet. The battery cell module comprises a plurality of battery cells arranged along the thickness direction of the battery cells, and the thickness direction of the battery cells is perpendicular to the first direction.

7. The battery pack of claim 6, wherein, The battery pack further comprises a flow guide plate arranged in the receiving cavity and connected with the box body. The flow guide plate comprises a plurality of fins distributed along the direction from the air inlet to the air outlet, one end of the fin is connected with the inner wall of the box body, and the fin is arranged at an angle relative to the first direction.

8. The battery pack of claim 7, wherein, In the direction from the air inlet to the air outlet, the inclination angles of the fins relative to the first direction gradually increase.

9. The battery pack of any one of claims 1 to 7, wherein, The battery pack further comprises an isolation assembly, the isolation assembly comprises a blocking plate and a fuse, the fuse connects the blocking plate and the box body, and the fuse is melted when the temperature of the fuse exceeds a threshold value, and the blocking plate seals the air vent.

10. The battery pack of claim 9, wherein, The isolation assembly further comprises a limiting piece, the blocking plate and the limiting piece are arranged at opposite ends of the air vent, and the limiting piece is used to support the blocking plate after the fuse is broken.

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