Partition beam, box body, battery pack and electric equipment

Abstract

A partition beam, a box body, a battery pack and electric equipment are provided, the partition beam is provided with a phase change cavity, the phase change cavity is filled with a first phase change material, and the first phase change material is used for absorbing heat and changing into gas through phase change; the partition beam is further provided with an exhaust channel, and the exhaust channel is used for exhausting gas in the phase change cavity. According to the technical scheme, the partition beams are arranged between the battery assemblies, and the first phase change materials are arranged in the phase change cavities of the partition beams. When a battery assembly in the battery pack is subjected to thermal runaway, the first phase change material in the phase change cavity of the partition beam can quickly absorb heat and vaporize, and takes away the heat of the battery assembly. Meanwhile, the vaporized first phase change material can be discharged out of the battery pack through the exhaust channel of the partition beam, so that the temperature in the battery pack is reduced, the heat dissipation effect of the battery pack in a thermal runaway state is improved, and the safety performance of the battery pack is improved.

Description

Technical Field

[0001] The present application relates to the field of heat dissipation technology, and in particular to a partition beam, a box body, a battery pack and electrical equipment. Background Art

[0002] During the use of the battery pack, overcharging, overdischarging, short circuiting, puncturing, and extrusion of the battery pack may cause thermal runaway of a battery component in the battery pack. At this time, if no measures are taken, the thermal runaway of the battery component may spread to the entire battery pack.

[0003] The related technology usually sets phase change materials between adjacent battery components. When the battery component experiences thermal runaway, the phase change material undergoes phase change and absorbs heat, thereby taking away the heat of the battery component and reducing the temperature of the battery component.

[0004] However, this cooling method still cannot effectively reduce the heat spread rate of the battery components in the battery pack. Utility Model Content

[0005] The purpose of the present application is to provide a partition beam, a box body, a battery pack and an electrical device, aiming to solve the problem of poor heat dissipation effect of the partition beam in the related art.

[0006] To achieve the purpose of the present application, in a first aspect, the present application provides a partition beam, wherein the partition beam is provided with a phase change cavity, wherein the phase change cavity is filled with a first phase change material, wherein the first phase change material is used to absorb heat and phase change into a gas;

[0007] The partition beam is also provided with an exhaust channel, and the exhaust channel is used to exhaust the gas in the phase change cavity.

[0008] In a possible implementation, a communication hole is provided in the exhaust channel, and the exhaust channel is connected with the phase change chamber through the communication hole;

[0009] The partition beam further comprises a sealing structure, wherein the sealing structure is sealed to the communicating hole, and the sealing structure is configured to be opened at a preset temperature.

[0010] In a possible implementation, the material of the sealing structure is a second phase change material, the phase change temperature of the first phase change material after absorbing heat is T1, the phase change temperature of the second phase change material after absorbing heat is T2, and 10°≤T1-T2≤55°.

[0011] In a possible implementation manner, the phase change temperature of the first phase change material after absorbing heat is T1, and 80°≤T1≤120°.

[0012] In a possible implementation, the partition beam includes a first wall and a second wall, and the first wall is arranged to form a first cavity;

[0013] The second wall is arranged in the first cavity and connected to the wall surface of the first cavity; the second wall is arranged to form the exhaust channel, and the second wall and the wall surface of the first cavity are arranged to form the phase change cavity.

[0014] In a possible implementation, the partition beam further includes a fan, and the fan is disposed on one side of the exhaust passage.

[0015] In a second aspect, the present application further proposes a box, the box comprising:

[0016] tray;

[0017] A partition beam, the partition beam is arranged on the tray, the partition beam is provided with a phase change cavity, the phase change cavity is filled with a first phase change material, and the first phase change material is used for absorbing heat and changing into a gas;

[0018] The partition beam is also provided with an exhaust channel, and the exhaust channel is used to exhaust the gas in the phase change cavity.

[0019] In a possible implementation, the pallet includes a body and side beams; the side beams are arranged around the outer edge of the body, and the side beams are provided with through holes;

[0020] The partition beam is arranged on the main body and corresponds to the through hole.

[0021] In a possible implementation manner, the partition beam passes through the through hole and extends out of the tray.

[0022] In a possible implementation, the box body further includes a fan, and the fan is disposed between the through hole and the exhaust channel.

[0023] In a possible implementation, the heat insulation sheet is used to be arranged between the partition beam and the battery assembly.

[0024] In a third aspect, the present application further proposes a battery pack, the battery pack comprising a box, the box comprising:

[0025] tray;

[0026] A partition beam, the partition beam is arranged on the tray, the partition beam is provided with a phase change cavity, the phase change cavity is filled with a first phase change material, and the first phase change material is used for absorbing heat and changing into a gas;

[0027] The partition beam is also provided with an exhaust channel, and the exhaust channel is used to exhaust the gas in the phase change cavity.

[0028] In a fourth aspect, the present application further proposes an electric device, the electric device comprising a battery pack, the battery pack comprising a box, the box comprising:

[0029] tray;

[0030] A partition beam, the partition beam is arranged on the tray, the partition beam is provided with a phase change cavity, the phase change cavity is filled with a first phase change material, and the first phase change material is used for absorbing heat and changing into a gas;

[0031] The partition beam is also provided with an exhaust channel, and the exhaust channel is used to exhaust the gas in the phase change cavity.

[0032] The technical solution of the present application is to set a partition beam between the battery components and set a first phase change material in the phase change cavity of the partition beam. When a battery component in the battery pack experiences thermal runaway, the first phase change material in the phase change cavity of the partition beam can quickly absorb heat and vaporize, and take away the heat of the battery component. At the same time, the vaporized first phase change material can be discharged from the battery pack through the exhaust channel of the partition beam, thus avoiding gas accumulation inside the partition beam, thereby preventing the first phase change material from absorbing the heat of the battery pack, thereby achieving efficient reduction of the temperature in the battery pack, effectively reducing the heat propagation speed of the battery components in the battery pack, improving the heat dissipation effect of the battery pack in the thermal runaway state, and improving the safety performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 A schematic structural diagram of an embodiment of a battery pack provided in this application;

[0035] Figure 2 for Figure 1 Top view of the middle box;

[0036] Figure 3 for Figure 1 Cross-sectional view of the septum beam;

[0037] Figure 4 for Figure 1 Sectional view at AA;

[0038] Figure 5 for Figure 1 Schematic diagram of the assembly of the middle partition beam and the tray;

[0039] Figure 6 for Figure 1 Sectional view at BB.

[0040] Description of reference numerals:

[0041] 1000-battery pack;

[0042] 100- cabinet;

[0043] 10, 10a, 10b-partition beams, 11-phase change chamber, 12-exhaust channel, 121-air inlet, 122-exhaust port, 13-first phase change material, 14-connecting hole, 15-sealing structure, 16-first wall, 17-second wall;

[0044] 20-tray, 21-body, 22-side beam, 23-through hole, 24-exhaust outlet;

[0045] 30- fan;

[0046] 40-heat insulation sheet;

[0047] 50-pressure valve;

[0048] 200-battery assembly. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0050] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0051] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this application and in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this application includes any and all combinations of one or more of the related listed items.

[0052] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0053] The present application proposes an electrical device, which can be a vehicle, a ship, or an aircraft, and the present application does not limit this. For ease of explanation, a vehicle is taken as an example. When the electrical device is a vehicle, the vehicle can be an electric vehicle, a fuel vehicle, or a hybrid vehicle, and the present application does not limit this.

[0054] The vehicle includes a body, a load and a battery pack. The body serves as the supporting frame of the vehicle and is used to support and connect the various parts of the vehicle. The load is located on the body and can be a dashboard, a motor, or a window lifting mechanism, which is not limited in this application. The battery pack is located in the battery compartment of the body and is electrically connected to the load. The battery pack is used to store and transmit electricity to maintain normal use of the load.

[0055] Please refer to Figure 1 The battery pack 1000 includes a case 100, a battery assembly 200 and a battery management system (not shown in the figure). The case 100 serves as a supporting skeleton of the battery pack 1000, and is used to support and connect the various parts and structures of the battery pack 1000. The case 100 includes a tray 20, and the tray 20 serves as the main body of the case 100, and the battery assembly 200 is installed on the tray 20. The battery assembly 200 is composed of a plurality of battery cells connected in series or in parallel, and the battery cell can be a ternary lithium battery cell or an iron lithium battery cell, which is not limited in this application. The battery assembly 200 is used to connect to a load to provide electrical energy to the load. The number of battery assemblies 200 can be set to one or two, which is not limited in this application. The battery management system is connected to the battery assembly 200, and is used to collect and control information such as the voltage, current, and temperature of the battery assembly 200.

[0056] During the use of the battery pack 1000, overcharging, overdischarging, short circuit, puncture, and extrusion of the battery pack 1000 may cause thermal runaway of the battery assembly 200 in the battery pack 1000. In order to prevent the spread of thermal runaway of the battery assembly 200, the related technology will set phase change materials between the battery assemblies 200. When the battery assembly 200 has thermal runaway, the phase change material will absorb heat through phase change, thereby taking away the heat of the battery assembly and reducing the temperature of the battery assembly 200. However, this cooling method still cannot effectively reduce the heat spread rate of the battery assembly 200 in the battery pack 1000.

[0057] Please refer to Figure 2 To solve the above problems, in the present application, the box 100 further includes a partition beam 10, which is disposed on the tray 20 to limit and separate the battery assembly 200 disposed on the tray 20. The partition beam 10 can be disposed around the outer edge of the tray 20 as shown by the partition beam 10a, or can be disposed across the entire tray 20 as shown by the partition beam 10b, and the present application does not limit this.

[0058] Please refer to Figure 3 and Figure 4 , partition beam 10, the partition beam 10 is provided with a phase change cavity 11, the phase change cavity 11 is filled with a first phase change material 13, the first phase change material 13 is used to absorb heat and change into gas; the partition beam 10 is also provided with an exhaust channel 12, the exhaust channel 12 is connected to the phase change cavity 11, the exhaust channel 12 is used to discharge the gas in the phase change cavity 11. The technical solution of the present application is to set a partition beam 10 between the battery assemblies 200, and set a first phase change material in the phase change cavity 11 of the partition beam 10. When the battery assembly 200 in the battery pack 1000 has thermal runaway, the first phase change material in the phase change cavity 11 can quickly absorb heat and vaporize, and take away the heat of the battery assembly 200. At the same time, the vaporized first phase change material can be discharged from the battery pack through the exhaust channel 12 of the partition beam 10, thus avoiding the accumulation of gas in the phase change cavity 11, thereby reducing the thermal insulation effect increased by the gas accumulation, so that the first phase change material can absorb the heat of the battery assembly 200 more efficiently, and effectively reduce the heat propagation speed of the battery assembly 200 in the battery pack 1000, efficiently reduce the temperature in the battery pack, improve the heat dissipation effect of the battery pack under thermal runaway, and improve the safety performance of the battery pack.

[0059] Hereinafter, the partition beam 10 provided in the present application will be described in detail with reference to the accompanying drawings.

[0060] The partition beam 10 includes a first wall 16 and a second wall 17, and the first wall 16 is arranged to form a first cavity. The second wall 17 is arranged in the first cavity and connected to the wall surface of the first cavity; the second wall 17 and the wall surface of the first cavity are arranged to form a phase change cavity 11. Under this structure, the partition beam 10 can be integrally formed by casting, thereby reducing the manufacturing cost of the partition beam 10. The phase change cavity 11 is filled with a first phase change material 13. The first phase change material 13 is used to absorb heat and change into a gas when thermal runaway occurs in the battery assembly 200, thereby taking away the heat of the battery assembly 200, increasing the thermal resistance between the runaway battery assembly 200 and other battery assemblies 200, and slowing down the heat propagation speed of the battery assembly 200.

[0061] The first phase change material 13 can be a liquid material, a solid material, or a gel-state material between a liquid and a solid. When the first phase change material 13 adopts a liquid phase change material, the first phase change material 13 can be water or alcohol. When the first phase change material 13 adopts a solid phase change material, the first phase change material 13 can adopt paraffin, polyethylene glycol (PEG), and other solid materials that can change from a solid state to a liquid state, and then from a liquid state to a gaseous state. The first phase change material 13 can also adopt dry ice, sublimated sulfur, and other solid materials that can directly change from a solid state to a gaseous state, and the present application does not impose any restrictions on this.

[0062] In order to control the phase change timing of the first phase change material 13, in one embodiment of the present application, the phase change temperature of the first phase change material 13 after absorbing heat is T1, 80°≤T1≤120°. Under this temperature limit, the first phase change material 13 will not be unable to absorb the heat of the battery assembly 200 in time due to the phase change temperature being too high, thereby affecting the barrier effect of the partition beam 10 on the thermal runaway of the battery assembly 200. Nor will the first phase change material 13 be triggered in advance due to the phase change temperature being set too low, thereby affecting the amount of heat absorbed by the partition beam 10 for the battery assembly 200.

[0063] The second wall 17 is arranged to form an exhaust channel 12, and the exhaust channel 12 is connected to the phase change cavity 11 and the external atmosphere of the battery pack 1000. The exhaust channel 12 has an air inlet 121 and an exhaust port 122, and the exhaust channel 12 is connected to the external atmosphere through the air inlet 121 and the exhaust port 122. In one embodiment of the present application, the air inlet 121 and the exhaust port 122 of the exhaust channel 12 are both provided with a pressure valve 50. The pressure valve 50 is used to form a seal at the air inlet 121 and the exhaust port 122 of the exhaust channel 12, thereby preventing external water vapor from entering the exhaust channel 12 through the air inlet 121 and the exhaust port 122 of the exhaust channel 12 and contaminating the first phase change material 13. When thermal runaway occurs in the battery assembly 200, the first phase change material 13 absorbs heat and evaporates. The evaporated first phase change material 13 and the increased temperature will cause the air pressure in the exhaust channel 12 to increase. When the air pressure in the exhaust channel 12 is greater than the pressure value of the pressure valve 50, the pressure valve 50 provided at the air inlet 121 and the exhaust port 122 is opened, and the first phase change material 13 in the phase change cavity 11 and the hot air in the phase change cavity 11 are discharged from the partition beam 10 through the exhaust port 122 under the action of pressure, and the cold air outside the battery pack 1000 enters the partition beam 10 through the air inlet 121. In this way, the internal temperature of the partition beam 10 is reduced, the accumulation time of heat in the partition beam 10 is delayed, the thermal resistance of the partition beam 10 to the battery assembly 200 is increased, and the heat spread speed of the battery assembly 200 is delayed.

[0064] It can be understood that in other possible implementation modes of the present application, the pressure valve 50 may not be set at the air inlet 121 and the exhaust port 122. When the battery assembly 200 undergoes thermal runaway, the evaporation of the first phase change material 13 will also cause the air pressure in the phase change cavity 11 and the exhaust channel 12 to increase. Under the action of the exhaust channel 12, the evaporated first phase change material 13 can still be discharged out of the battery pack 1000 through the exhaust channel 12.

[0065] A connecting hole 14 is provided in the exhaust channel 12 . The connecting hole 14 may be a circular hole, a square hole, or a long strip hole, which is not limited in the present application. The exhaust channel 12 is connected to the phase change chamber 11 through the connecting hole 14 .

[0066] The partition beam 10 also includes a sealing structure 15. When the battery assembly 200 does not experience thermal runaway, the sealing structure 15 is sealed to the communication hole 14, thereby preventing the first phase change material 13 in the phase change cavity 11 from passing through the communication hole 14 too early into the exhaust channel 12, thereby reducing the loss of the first phase change material 13. When the battery assembly 200 experiences thermal runaway and the thermal runaway temperature reaches a preset temperature, the sealing structure 15 is opened, so that the first phase change material 13 in the phase change cavity 11 can be discharged from the battery pack 1000 through the exhaust channel 12.

[0067] There are many ways to open the sealing structure 15 at a preset temperature. In one embodiment of the present application, the sealing structure 15 uses gel or other molten parts. When the thermal runaway temperature reaches the preset temperature, the gel melts and avoids the connecting hole 14, so that the first phase change material 13 in the phase change cavity 11 can enter the exhaust channel 12 through the connecting hole 14 and be discharged from the battery pack 1000 along the exhaust channel 12.

[0068] In another possible implementation of the present application, the sealing structure 15 can also be an explosion-proof membrane. When thermal runaway occurs in the battery assembly, the first phase change material absorbs heat and vaporizes, and the air pressure in the phase change cavity increases. When the temperature of the partition beam reaches a preset temperature, the air pressure in the phase change cavity just breaks open the explosion-proof membrane, and the first phase change material 13 in the phase change cavity 11 enters the exhaust channel 12 through the connecting hole 14, and is discharged from the battery pack 1000 along the exhaust channel 12.

[0069] In another possible implementation of the present application, the sealing structure 15 adopts a deformable part. When the thermal runaway temperature reaches a preset temperature, the deformable part is deformed and avoids the connecting hole 14, so that the first phase change material 13 in the phase change cavity 11 can enter the exhaust channel 12 through the connecting hole 14 and be discharged from the battery pack 1000 along the exhaust channel 12.

[0070] In another possible implementation of the present application, the material of the sealing structure 15 is a second phase change material. When the temperature of the partition beam 10 reaches a preset temperature, the sealing structure 15 vaporizes or melts and decomposes, thereby avoiding the connecting hole 14. In order to ensure that the sealing structure 15 can be decomposed in time, in a possible implementation of the present application, the phase change temperature of the first phase change material 13 after absorbing heat is T1, the phase change temperature of the second phase change material after absorbing heat is T2, and the phase change temperature difference between the first phase change material 13 and the second phase change material after absorbing heat is T1-T2, and T1-T2 satisfies the relationship: 10°≤T1-T2≤55°. Under this temperature difference limit, the second phase change material will not melt too late, resulting in the gas of the first phase change material 13 in the phase change cavity 11 being unable to be discharged to the outside, affecting the heat dissipation efficiency of the partition beam 10, nor will it melt too early, affecting the sealing effect of the second phase change material on the connecting hole 14.

[0071] The tray 20 of the box 100 includes a main body 21 and a side beam 22. The side beam 22 is arranged around the outer edge of the main body 21. One end of the side beam 22 is connected to the main body 21, and the other end extends to the side away from the main body 21. The bottom of the partition beam 10 is arranged on the main body 21 of the tray 20, and the two ends of the partition beam 10 are connected to the side beam 22, so as to form a support on the side beam 22 and the main body 21, thereby improving the support strength of the tray 20 for the battery assembly 200 and improving the stability of the battery assembly 200 arranged in the box 100.

[0072] A through hole 23 is also provided on the side beam 22, and the partition beam 10 is arranged opposite to the through hole 23. In one embodiment of the present application, the exhaust channel 12 of the partition beam 10 is connected to the through hole 23. When the battery assembly 200 has thermal runaway, the vaporized first phase change material 13 in the partition beam 10 can be discharged out of the box body 100 through the through hole 23.

[0073] In addition, in another possible implementation of the present application, the partition beam 10 may pass through the through hole 23 and extend out of the tray 20. The extension setting of the partition beam 10, on the one hand, can increase the operating space at both ends of the partition beam 10, thereby facilitating the installation and maintenance of the pressure valve 50 provided in the air inlet 121 and the exhaust port 122 of the partition beam 10. On the other hand, the extension setting of the partition beam 10 can also guide the exhaust port 122 of the exhaust channel 12 to the outside of the box body 100, reduce the possibility of the first phase change material 13 in the exhaust through hole 23 leaking into the box body 100, and protect the safety of the battery assembly 200.

[0074] Please refer to Figure 5 The side beam 22 is also provided with an exhaust outlet 24 , through which the gas and heat in the box body 100 can be discharged to the atmosphere.

[0075] In one possible implementation mode of the present application, the partition beam 10 further includes a fan 30, which is disposed on one side of the exhaust passage 12 and between the through hole 23 and the exhaust passage 12. The fan 30 is connected to the partition beam 10 and the tray 20. The fan 30, the partition beam 10 and the tray 20 can be connected by bonding or welding. When the fan 30, the partition beam 10 and the tray 20 are connected by welding, the fan 30, the partition beam 10 and the tray 20 can be connected by laser welding or by wire welding, and the present application does not limit this.

[0076] The fan 30 is electrically connected to the controller of the battery pack 1000. When the controller detects that the battery assembly 200 has thermal runaway, the controller will turn on the fan 30, thereby accelerating the flow rate of air in the exhaust channel 12, improving the heat dissipation effect of the partition beam 10, and slowing down the spread of thermal runaway of the battery assembly 200.

[0077] There are many ways for the controller to detect thermal runaway of the battery assembly 200. In one embodiment of the present application, a position sensor is provided in the pressure valve 50 of the air inlet 121 and the exhaust port 122, and the controller is connected to the position sensor. When the pressure valve 50 is opened under the action of air pressure, the mechanical position of the valve port of the pressure valve 50 changes. The position sensor that captures the change will transmit the signal to the controller, thereby assisting the controller in determining whether the battery assembly 200 has thermal runaway, thereby turning on the fan 30.

[0078] In other possible implementations of the present application, a temperature sensor may also be provided on each battery assembly 200, and a controller is connected to each temperature sensor. When the temperature of a battery assembly 200 exceeds a preset threshold, the controller determines that thermal runaway has occurred in the battery assembly 200, thereby turning on the fan 30 of the partition beam 10 adjacent to the battery assembly 200 to prevent the spread of thermal runaway of the battery assembly 200.

[0079] Please refer to Figure 6 The box 100 further includes a heat insulating sheet 40, which is disposed between the partition beam 10 and the battery assembly 200, and the heat insulating sheet 40 is connected to the partition beam 10. The heat insulating sheet 40 and the partition beam 10 can be connected by bonding or by hot pressing, which is not limited in the present application.

[0080] The heat insulation sheet is made of heat insulation material, so as to increase the thermal resistance between the partition beam 10 and the battery assembly 200, slow down the heat propagation speed from the battery assembly 200 to the heat insulation, and reduce the thermal runaway speed of the battery pack 1000. The heat insulation material of the heat insulation sheet 40 can be aerogel, polystyrene foam, or expanded polystyrene board, and this application does not limit this.

[0081] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0082] What is disclosed above is only a preferred embodiment of the present application, and it certainly cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiment and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A partition beam, applied to a battery pack, characterized in that: The partition beam is provided with a phase change cavity, and the phase change cavity is filled with a first phase change material, and the first phase change material is used for absorbing heat and changing into a gas; The partition beam is also provided with an exhaust channel, and the exhaust channel is used to exhaust the gas in the phase change cavity.

2. The partition beam according to claim 1, characterized in that: A communication hole is provided in the exhaust channel, and the exhaust channel is connected with the phase change chamber through the communication hole; The partition beam further comprises a sealing structure, wherein the sealing structure is sealed to the communicating hole, and the sealing structure is configured to be opened at a preset temperature.

3. The partition beam according to claim 2, characterized in that: The material of the sealing structure is a second phase change material, the phase change temperature of the first phase change material after absorbing heat is T1, the phase change temperature of the second phase change material after absorbing heat is T2, and 10°≤T1-T2≤55°.

4. The partition beam according to any one of claims 1 to 3, characterized in that: The phase change temperature of the first phase change material after absorbing heat is T1, 80°≤T1≤120°.

5. The partition beam according to claim 1, characterized in that: The partition beam comprises a first wall and a second wall, wherein the first wall is arranged to form a first cavity; The second wall is arranged in the first cavity and connected to the wall surface of the first cavity; the second wall is arranged to form the exhaust channel, and the second wall and the wall surface of the first cavity are arranged to form the phase change cavity.

6. The partition beam according to claim 1, characterized in that: The partition beam further comprises a fan, and the fan is arranged at one side of the exhaust passage.

7. A box, characterized in that: include: tray; The partition beam according to any one of claims 1 to 6, wherein the partition beam is arranged on the pallet.

8. The box body according to claim 7, characterized in that: The pallet comprises a body and side beams; the side beams are arranged around the outer edge of the body, and the side beams are provided with through holes; The partition beam is arranged on the main body and corresponds to the through hole.

9. The box body according to claim 8, characterized in that: The partition beam passes through the through hole and extends out of the tray.

10. The box body according to claim 8, characterized in that: The exhaust passage is communicated with the through hole.

11. The box body according to claim 7, characterized in that: The box body also includes a heat insulation sheet, which is used to be arranged between the partition beam and the battery assembly.

12. A battery pack, characterized in that: It comprises a battery assembly and a box body as claimed in any one of claims 7 to 11, wherein the battery assembly is arranged in the box body.

13. An electrical equipment, characterized in that: Comprising the battery pack as claimed in claim 12.

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