Heat absorption device, battery pack and electric apparatus

Abstract

An electric apparatus, which is provided with a battery pack. The battery pack comprises a housing, a plurality of battery cells arranged inside the housing, and heat absorption devices, wherein each heat absorption device is located between two adjacent battery cells, is thermally conductively connected to the housing and is used for absorbing heat of a thermal runaway battery cell. Each heat absorption device comprises a beam structure and a thermally conductive member, wherein a channel is provided in the beam structure; a heat exchange medium is arranged in the channel; and the thermally conductive member is arranged on the inner wall of the channel, is in thermally conductive contact with the heat exchange medium, and is used for guiding heat of the beam structure to the heat exchange medium.

Description

Heat absorption device, battery pack and electrical equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202323263965.3, filed on November 30, 2023, entitled “Heat absorption device, battery pack and electrical equipment,” and the entire contents of that application are incorporated herein for all purposes. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a heat absorption device, a battery pack and an electrical device. Background Art

[0004] With the rapid development of new energy vehicles, factors that cause thermal runaway include but are not limited to excessive temperature, overcharging, over-discharging, short circuit, puncture, and extrusion. Due to the complex operating environment of battery packs, thermal runaway is often impossible to completely avoid. Therefore, how to design thermal safety protection for heat sinks to enable them to avoid or delay thermal runaway and spread heat to adjacent battery components, thereby minimizing the risks and hazards of heat diffusion, is an urgent problem that needs to be solved.

[0005] Typically, thermal insulation is installed between adjacent battery cells to reduce heat diffusion. However, in a battery pack structure, the battery cells are placed inside the battery pack shell, which encapsulates and protects the battery cells. If a battery cell experiences thermal runaway, its heat will be transferred to the battery pack shell, which will transfer the heat to the adjacent battery cells. When the heat accumulation of the adjacent battery cells reaches the thermal runaway temperature, thermal diffusion and heat spread will occur.

[0006] Summary of the Invention

[0007] The purpose of this application is to provide a heat absorption device, a battery pack and an electrical device to solve the technical problem in the prior art that thermal runaway of battery cells easily leads to heat diffusion.

[0008] To achieve the purpose of this application, this application provides the following technical solutions:

[0009] In a first aspect, the present application provides a heat sink, comprising:

[0010] The beam structure is provided with a channel, and a heat exchange medium is provided in the channel.

[0011] A heat conducting member is provided on the inner wall of the channel and is in thermal contact with the heat exchange medium, so as to reduce the heat of the beam structure.

[0012] Optionally, the heat conducting member is a plurality of linearly arranged plates.

[0013] Optionally, the heat conducting members are arranged at intervals along the thickness direction of the beam structure.

[0014] Optionally, the heat conducting member is provided on the upper end surface and / or the lower end surface of the channel, and the length of the heat conducting member along the height direction of the channel is smaller than the height of the channel.

[0015] Optionally, the heat conducting member is disposed between the upper end surface and the lower end surface of the channel, and the heat conducting member extends along the height direction of the channel and contacts the upper end surface and the lower end.

[0016] Optionally, the heat conductive part is arranged on the upper end surface and the lower end surface of the channel, the heat conductive part located on the upper end surface and the heat conductive part located on the lower end surface extend in opposite directions respectively, the heat conductive part located on the upper end surface and the heat conductive part located on the lower end surface are staggered, and the length of the heat conductive part along the height direction of the channel is greater than half of the height of the channel and less than the height of the channel.

[0017] Optionally, the heat conducting member divides the channel into a plurality of cavities, and a through hole is provided on the heat conducting member for conducting the gas generated after the heat exchange medium inside the plurality of cavities absorbs heat, and an exhaust port is provided on the beam structure.

[0018] Optionally, an exhaust pipe is provided at the exhaust port for discharging the gas, and the exhaust pipe is provided with a switch valve. The switch valve is turned on when the gas pressure value of the gas reaches a threshold value, thereby discharging the gas to the outside of the heat absorption device.

[0019] Optionally, the heat exchange medium is a phase change material.

[0020] Optionally, the heat conductor is made of one of metal, graphite, graphene, aluminum oxide, and silicon carbide.

[0021] Optionally, the heat conducting member is arc-shaped or plate-shaped with grooves.

[0022] In a second aspect, the present application provides a battery pack, comprising:

[0023] case;

[0024] a plurality of battery cells, wherein the plurality of battery cells are accommodated in the housing;

[0025] The heat absorption device described in any of the above embodiments is arranged between two adjacent battery cells and is thermally connected to at least one end surface of the shell to absorb heat from the end surface of the shell.

[0026] Optionally, a heat conducting plate is provided between the heat absorbing device and the battery core, for conducting the heat of the battery core to the heat absorbing device to cool the battery core.

[0027] Optionally, there is an air gap between the beam structure and the battery cells, which is used to block heat transfer between adjacent battery cells.

[0028] Optionally, the housing includes an upper cover plate and a tray, and the upper cover plate and / or the tray are provided with a cooling structure, and the cooling structure is used to reduce the temperature of the end surface of the battery cell.

[0029] In a third aspect, the present application provides an electrical device, comprising a battery pack and an electrical appliance provided in any of the above embodiments, wherein the battery pack is used to power the electrical appliance.

[0030] The heat absorption device, battery pack and electrical equipment provided by the present application are arranged between adjacent battery cells and thermally connected to the shell that contains the battery cells. A channel is provided in the beam structure to accommodate a heat exchange medium. The heat exchange medium can cool the beam structure, thereby controlling the temperature of the battery cells within a normal range. In addition, in order to reduce the probability of heat from thermal runaway battery cells being conducted to adjacent battery cells through the shell, resulting in a heat diffusion event, a heat conductor is provided on the inner wall of the channel of the beam structure that is thermally connected to the shell. The heat conductor is thermally connected to the heat exchange medium and is used to conduct the heat of the shell into the heat exchange medium, thereby timely reducing the temperature of the shell, which is beneficial to reducing the risk of heat diffusion and heat spread in the battery cells and improving the safety and reliability of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the implementation methods or the description of the prior art. 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.

[0032] FIG1 is an exploded view of the battery pack structure provided in this application;

[0033] FIG2 is a perspective view of the heat absorption device provided by the present application;

[0034] FIG3 is a schematic structural diagram of a heat absorption device provided in the present application;

[0035] FIG4 is a schematic diagram 1 of a heat conducting member of a heat absorbing device according to an embodiment;

[0036] FIG5 is a schematic diagram 2 of a heat conducting member of a heat absorbing device according to an embodiment;

[0037] FIG6 is a schematic diagram 3 of a heat conducting member of a heat absorbing device according to an embodiment;

[0038] FIG7 is a schematic diagram of a heat-absorbing device having a heat-conducting member with air holes according to an embodiment;

[0039] FIG8 is a schematic structural diagram of an arc-shaped heat-conducting member of a heat-absorbing device according to an embodiment;

[0040] FIG9 is a schematic structural diagram of a heat sink with a stamped groove heat conducting member according to an embodiment;

[0041] Description of reference numerals:

[0042] 1-heat absorbing device; 10-beam structure; 11-channel; 12-cavity; 20-heat conducting member; 21-through hole; 30-exhaust port; 31-exhaust duct;

[0043] 4-battery pack; 40-battery cell; 51-upper cover; 52-tray; 53-cooling structure. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0045] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be an intermediate component. When a component is referred to as being "connected to" another component, it may be directly connected to the other component or there may be an intermediate component.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the relevant listed items.

[0047] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship of terms such as "upper", "lower", "vertical", "horizontal", "inside", and "outside" is based on the orientation or positional relationship described in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0049] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0050] The heat absorption device 1 includes a beam structure 10 and a heat conductor 20. A channel 11 is opened in the beam structure 10, and the channel 11 contains a phase change material. The phase change material absorbs heat transferred from the battery cell 40 to the beam structure 10 during the phase change heat absorption process. The heat conductor 20 is arranged on the upper end surface and / or the lower end surface of the inner wall of the channel 11. The heat conductor 20 is at least partially immersed in the phase change material and is used to conduct heat from the upper and lower end surfaces of the beam structure 10 to the phase change material.

[0051] The present application provides an electrical device, which includes a battery pack 4 and an electrical appliance. The battery pack 4 is used to power the electrical appliance, which may be an electric car, an electric train, a golf cart, etc.

[0052] The present application also provides a battery pack 4, as shown in FIG1 . Typically, the battery pack 4 includes multiple battery cells 40 and a housing for accommodating the multiple battery cells 40. The housing typically includes a tray 52 and an upper cover 51. The upper cover 51 is positioned above the battery cells 40 and cooperates with the tray 52 to form a housing to protect the battery. In the event of thermal runaway of a battery cell 40, there are two pathways for heat transfer from the thermally runaway battery cell 40 to adjacent battery cells 40. One pathway allows heat transfer between the opposing surfaces of adjacent battery cells 40. The other pathway allows the thermally runaway battery cell 40 to transfer heat to the housing, which in turn transfers heat to adjacent battery cells 40. A heat sink 1 is located between adjacent battery cells 40. The heat sink 1 is thermally conductively connected to at least one end face of the housing and is used to absorb heat from the end face of the housing to which it is thermally conductively connected, thereby reducing the risk of heat transfer from the thermally runaway battery cell 40 to adjacent battery cells 40 through the housing, thereby causing thermal diffusion. It should be noted that the battery cell 40 may refer to a module consisting of multiple battery cells arranged in an array (as shown in FIG1 ).

[0053] As shown in FIG1 , the heat absorption device 1 may be in a “cross” shape and disposed between four battery cells 40 , and any two adjacent battery cells 40 are spaced apart by the heat absorption device 1 .

[0054] In one embodiment, there are multiple heat absorption devices 1, which are arranged at intervals between multiple battery cells 40. Each heat absorption device 1 is located between two battery cells 40, which can effectively reduce the probability of heat diffusion from the thermal runaway battery cell 40 to the adjacent battery cell 40, resulting in heat spread.

[0055] In one embodiment, a heat conducting plate is provided between the battery cell 40 and the heat absorbing device 1, and the heat conducting plate is used to quickly conduct the heat of the battery cell 40 in thermal runaway to the heat absorbing device 1, thereby timely reducing the temperature of the battery cell 40 in thermal runaway and reducing the occurrence of thermal runaway heat spread.

[0056] In one embodiment, an air gap exists between the battery cells 40 and the heat sink 1. The air gap has a certain thermal insulation effect and can effectively suppress the heat transfer in the heat conduction path between adjacent battery cells 40. The heat sink 1 can absorb the heat of the upper cover 51 and the tray 52 in a timely manner to cool them down, and can also effectively reduce the probability of heat spread.

[0057] As shown in FIG1 , in one embodiment, the upper cover 51 and / or the tray 52 are provided with a cooling structure 53, which is used to reduce the temperature of the end faces of the battery cells 40. It is understood that when the heat sink 1 is thermally connected to at least one end face of the housing, for example, the heat sink 1 is thermally connected to the tray 52, a cold plate is provided on the upper cover 51 to reduce the temperature of the thermally runaway battery cells 40 transmitted to the upper cover 51, and a cold plate can be provided on the tray 52; when the heat sink 1 is thermally connected to the upper cover 51, a cold plate is provided on the tray 52 to reduce the temperature of the thermally runaway battery cells 40 transmitted to the tray 52, and a cold plate can be provided on the upper cover 51.

[0058] The present application also provides a heat absorption device 1, as shown in FIG2 , which includes: a beam structure 10 having a channel 11 formed therein, wherein a heat exchange medium is disposed in the channel 11; and a heat conductor 20 disposed on the inner wall of the channel 11, in thermal contact with the heat exchange medium, for reducing the heat of the beam structure 10. It is understood that the heat conductor 20 is disposed on the inner wall of the channel 11 of the beam structure 10, wherein a heat exchange medium is disposed in the channel 11 of the beam structure 10, and the heat conductor 20 is in thermal contact with the heat exchange medium, and can conduct the heat of the beam structure 10 into the heat exchange medium, thereby reducing the temperature of the beam structure 10. Specifically, in the event that a battery cell 40 experiences thermal runaway, the heat exchange medium in the beam structure 10 can quickly absorb the heat transferred from the thermally runaway battery, reducing the heat transfer from the thermally runaway battery cell 40 to other adjacent battery cells 40, and effectively reducing the probability of heat diffusion. However, the simple beam structure 10 cannot effectively suppress the transfer of heat from the tray 52 and the upper cover 51. When the heat of the thermal runaway battery cell 40 is transferred to the adjacent battery cell 40 through the tray 52 and the upper cover 51, and the heat of the adjacent battery cell 40 reaches the thermal runaway temperature, heat spread will occur.

[0059] On the other hand, the battery cell 40 in thermal runaway fits tightly with the tray 52 and the upper cover 51, and can transfer heat to the adjacent battery cell 40 through the tray 52 or the upper cover 51. When the heat accumulated by the adjacent battery cells 40 through the upper cover 51 and the tray 52 reaches the temperature of thermal runaway, heat diffusion between the battery cells 40 will occur. Therefore, the beam structure 10 of the present application is thermally connected to the shell, and a heat conductor 20 is provided on the upper end surface and / or the lower end surface of the inner wall of the channel 11 in the beam structure 10. The heat conductor 20 is made of a material with a high thermal conductivity coefficient and is used to conduct the heat of the tray 52 and the upper cover 51 in the height direction of the battery pack 4 into the heat exchange medium, thereby reducing the heat of the thermal runaway battery cell 40 from being transferred to other battery cells 40 through the upper cover 51 and the tray 52, and reducing the probability of heat spread. It can effectively improve the safety performance of the battery pack 4.

[0060] In one embodiment, the heat conductors 20 are multiple linearly arranged plates. It is understood that the beam structure 10 is typically an elongated structure, and the heat conductors 20 are arranged linearly along the length of the beam structure 10. They can be arranged at equal or uneven intervals, for example, densely arranged in areas of the battery pack 4 where heat dissipation is difficult, such as in the middle of the battery cell 40. Alternatively, the heat conductors 20 can be spaced apart along the thickness of the beam structure 10 or along its length.

[0061] Preferably, the heat conducting members 20 are spaced apart along the thickness direction of the beam structure 10, where the thickness direction of the beam structure 10 refers to the direction in which two adjacent battery cells 40 are opposite to each other. The heat conducting members 20 are spaced apart along the direction in which the battery cells 40 are opposite to each other, which can effectively block heat transfer between the battery cells 40.

[0062] In one embodiment, the length of the heat conductor 20 along the height direction of the channel 11 of the beam structure 10 is smaller than the height of the channel 11 , and the heat conductor 20 is disposed on the upper end surface and / or the lower end surface of the inner wall of the channel 11 .

[0063] Optionally, as shown in Figure 4, the heat conductor 20 is arranged on the lower end surface of the channel 11 and extends toward the upper end surface. The length of the heat conductor 20 along the height direction of the channel 11 is less than the height of the channel 11. The heat conductor 20 can cool the lower end surface of the beam structure 10.

[0064] Optionally, the heat conductor 20 is arranged on the upper end surface of the channel 11 and extends toward the lower end surface. Its length along the height direction of the channel 11 is less than the height of the channel 11. The heat conductor 20 can conduct away the heat from the upper end surface of the beam structure 10 in a timely manner.

[0065] Optionally, as shown in FIG5 , a heat conductive member 20 is provided on the upper and lower end surfaces of the channel 11, and the heat conductive members 20 on the upper and lower end surfaces extend in opposite directions, respectively. If the length of the heat conductive member 20 along the height direction of the channel 11 of the beam structure 10 is less than the height of the channel 11, the heat conductive member 20 on the upper end surface and the heat conductive member 20 on the lower end surface are staggered to reduce the temperature of the upper and lower end surfaces of the beam structure 10. If the length of the heat conductive member 20 is greater than half the height of the channel 11 and less than the height of the channel 11, the heat conductive member 20 on the upper end surface and the heat conductive member 20 on the lower end surface intersperse with each other; when the length of the heat conductive member 20 is less than half the length of the channel 11, the heat conductive member 20 on the upper end surface and the heat conductive member 20 on the lower end surface are separated from each other. The length of the heat conducting member 20 is smaller than the height of the channel 11. When the raw materials for preparing the heat conducting members 20 are the same, a larger number of shorter heat conducting members 20 can be provided. The more heat conducting members 20 there are on the end face, the better the heat conducting effect. Therefore, while ensuring the realization of the heat conducting function, it is beneficial to save the preparation cost.

[0066] In one embodiment, the heat conducting member 20 is disposed between the upper end surface and the lower end surface, and the upper and lower end surfaces contact each other. Alternatively, as shown in FIG2 , the heat conducting member 20 is disposed vertically along the height direction of the channel 11 , and the heat conducting member 20 connects the upper and lower end surfaces, which can effectively enhance the strength of the beam structure 10 .

[0067] As shown in FIG. 6 , the heat conducting member 20 may optionally be tilted, and the tilt angle of the heat conducting member 20 relative to the vertical direction ranges from 1° to 45°. The heat conducting member 20 can enhance the strength of the beam structure 10 .

[0068] In one embodiment, the heat conducting member 20 is made of a material selected from metal, graphite, graphene, aluminum oxide, and silicon carbide. That is, the heat conducting member 20 is made of a material with a high thermal conductivity coefficient and has excellent thermal conductivity.

[0069] In one embodiment, the heat conductor 20 is an arc-shaped or grooved plate. As shown in FIG8 , the heat conductor 20 is optionally arc-shaped; as shown in FIG9 , the heat conductor 20 is optionally a plate with stamped grooves. It will be appreciated that configuring the heat conductor 20 as an arc-shaped or grooved plate can increase the heat exchange area between the heat conductor 20 and the heat absorbing material, improving the heat transfer rate and heat absorption efficiency. The grooved plate can be formed by flat plate stamping.

[0070] In one embodiment, the heat exchange medium may be a phase change material or a coolant. Optionally, the phase change material is one of hydrogel, paraffin, fatty acid, metal, crystalline hydrate, fatty alcohol, molten salt, and water.

[0071] When the heat conductor 20 connects to both the upper and lower end surfaces, it divides the channel 11 into several independent cavities 12. As shown in FIG7 , the phase change material undergoes a phase change and absorbs heat to generate gas. Therefore, through-holes 21 are provided on the heat conductor 20 to connect the multiple cavities 12. This allows the gas generated by the phase change material to be discharged through the through-holes 21, thereby preventing the dangerous excessive pressure generated by the phase change in the beam structure 10. Furthermore, when the channel 11 is divided into several independent cavities 12, the phase change material can be replenished through the through-holes 21 after volatilization or sublimation during the phase change.

[0072] Optionally, as shown in FIG3 , an exhaust port 30 is provided on the beam structure 10, and an exhaust duct 31 is provided outside the exhaust port 30. The exhaust duct 31 is used to exhaust the gas generated after the phase change material absorbs heat during the phase change. If the phase change material is liquid at room temperature and then absorbs heat to become a gas, it is necessary to provide multiple through holes 21 on the heat conductor 20, or to provide larger through holes 21. Furthermore, it is necessary to provide a larger exhaust port 30 and exhaust duct 31 to meet the exhaust requirements.

[0073] Optionally, the exhaust duct 31 can be directly connected to the exhaust channel 11 or exhaust hole of the battery pack 4, and exhaust can be achieved with the help of the structure of the battery pack 4 itself without adding other additional components, which helps to save costs and improve space utilization.

[0074] Optionally, a corresponding on-off valve (not shown in the drawings) is provided on the side of the exhaust duct 31 away from the exhaust port 30. This valve can be opened when the air pressure inside the beam structure 10 exceeds a threshold value, promptly discharging the gas generated by the phase change heat absorption, effectively reducing the air pressure inside the beam structure 10 and the probability of safety accidents caused by excessive air pressure generated by the phase change heat absorption. In addition, at room temperature or when the battery cell 40 is not experiencing thermal runaway, the on-off valve provides a relatively closed space for the phase change material to prevent volatilization of the phase change material and the ingress of external dust.

[0075] Specifically, a diaphragm is provided on the side of the exhaust pipe 31 away from the exhaust port 30. The diaphragm can be made of metal, polymer material, etc. When the phase change material in the channel 11 absorbs heat and produces gas, the generated gas can flow through the pores. When the gas in the channel 11 accumulates and the pressure rises to a threshold, for example, 0.5 MPa, reaching the detonation pressure of the diaphragm, the diaphragm ruptures, and the gas is discharged directly from the package through the exhaust port 30 and the exhaust pipe 31. The diaphragm can automatically rupture when the pressure reaches the threshold, allowing the gas to be discharged, without the need for additional manual operation.

[0076] The above disclosure is only a preferred embodiment of the present application, and 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 the above embodiment and equivalent changes made in accordance with the claims of the present application are still within the scope covered by the present application.

Claims

1. A heat absorbing device (1), characterized in that: The heat absorption device (1) comprises: A beam structure (10), wherein the beam structure (10) is provided with a channel (11), and a heat exchange medium is arranged in the channel (11); and A heat conducting member (20) is arranged on the inner wall of the channel (11) and is in thermal contact with the heat exchange medium, and is used to reduce the heat of the beam structure (10).

2. The heat absorption device (1) according to claim 1, characterized in that: The heat conducting member (20) is a plurality of linearly arranged plates.

3. The heat absorption device (1) according to claim 2, characterized in that: The heat conducting members (20) are arranged at intervals along the thickness direction of the beam structure (10).

4. The heat absorbing device (1) according to any one of claims 1 to 3, characterized in that: The heat conducting member (20) is arranged on the upper end surface and / or the lower end surface of the channel (11), and the length of the heat conducting member (20) along the height direction of the channel (11) is smaller than the height of the channel (11).

5. The heat absorbing device (1) according to any one of claims 1 to 3, characterized in that: The heat conducting member (20) is arranged between the upper end surface and the lower end surface of the channel (11); the heat conducting member (20) extends along the height direction of the channel (11) and contacts the upper end surface and the lower end surface.

6. The heat absorbing device (1) according to any one of claims 1 to 3, characterized in that: The heat conducting member (20) is arranged on the upper end surface and the lower end surface of the channel (11); the heat conducting member (20) located on the upper end surface and the heat conducting member (20) located on the lower end surface extend in opposite directions respectively; the heat conducting member (20) located on the upper end surface and the heat conducting member (20) located on the lower end surface are arranged alternately; and the length of the heat conducting member (20) along the height direction of the channel (11) is greater than half the height of the channel (11) and less than the height of the channel (11).

7. The heat absorbing device (1) according to any one of claims 4 to 6, characterized in that: The heat conducting member (20) divides the channel (11) into a plurality of cavities (12); a through hole (21) is provided on the heat conducting member (20) for conducting gas generated after the heat exchange medium absorbs heat inside the plurality of cavities (12); and an exhaust port (30) is provided on the beam structure (10).

8. The heat sink (1) according to claim 7, characterized in that: An exhaust pipe (31) is provided at the exhaust port (30) for exhausting the gas, and the exhaust pipe (31) is provided with a switch valve. When the gas pressure value of the gas reaches a threshold value, the switch valve is turned on to discharge the gas to the outside of the heat absorption device (1).

9. The heat absorbing device (1) according to any one of claims 1 to 8, characterized in that: The heat exchange medium is a phase change material.

10. The heat absorption device (1) according to any one of claims 1 to 9, characterized in that: The heat conducting member (20) is made of one of metal, graphite, graphene, aluminum oxide and silicon carbide.

11. The heat absorbing device (1) according to any one of claims 1 to 10, characterized in that: The heat conducting member (20) is arc-shaped or plate-shaped with grooves.

12. A battery pack (4), characterized in that: include: case; A plurality of battery cells (40), wherein the plurality of battery cells (40) are accommodated in the housing; The heat absorption device (1) according to any one of claims 1 to 11, wherein the heat absorption device (1) is arranged between two adjacent battery cells (40) and is thermally connected to at least one end surface of the shell to absorb heat from the end surface of the shell.

13. The battery pack (4) according to claim 12, characterized in that: A heat conducting plate is provided between the heat absorbing device (1) and the battery core (40) for conducting the heat of the battery core (40) to the heat absorbing device (1) to cool the battery core (40).

14. The battery pack (4) according to claim 12, characterized in that: An air gap exists between the beam structure (10) and the battery core (40), which is used to block heat transfer between adjacent battery cores (40).

15. The battery pack (4) according to any one of claims 12 to 14, characterized in that: The shell comprises an upper cover plate (51) and a tray (52); the upper cover plate (51) and / or the tray (51) are provided with a cooling structure (53); the cooling structure (53) is used to reduce the temperature of the end surface of the battery cell (40).

16. An electrical equipment, characterized in that: It comprises a battery pack (4) as claimed in any one of claims 12 to 15 and an electrical appliance, wherein the battery pack is used to supply power to the electrical appliance.

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