WO2025112818A1 - Heat absorption device, battery pack and electric apparatus - Google Patents

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

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Chinese Patent Application No. 202323263965.3, filed on November 30, 2023, entitled “Heat Endotherm, Battery Pack and Electrical Equipment”, the entire contents of which are incorporated herein for all purposes.

Technical Field

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

With the vigorous development of new energy vehicles, factors that cause thermal runaway include but are not limited to overtemperature, overcharging, overdischarging, short circuit, puncture, extrusion, etc. Since the operating environment of the battery pack is very complex, it is often impossible to completely avoid the occurrence of thermal runaway. Therefore, how to design thermal safety protection for the heat absorber so that the heat absorber has the ability to avoid or delay thermal runaway and spread heat to adjacent battery components, and minimize the risks and hazards of heat diffusion, is a problem that needs to be solved urgently.

Normally, heat insulation is set between adjacent battery elements to reduce heat diffusion. However, in the battery pack structure, the battery elements are set inside the battery pack shell, which will encapsulate the battery elements to protect them. If a battery element is in thermal runaway, its heat will be transferred to the battery pack shell, and the battery pack shell will transfer the heat to the adjacent battery elements. When the heat accumulation of the adjacent battery elements reaches the thermal runaway temperature, thermal diffusion and heat spread events will occur.

Summary of the invention

The purpose of the present application is to provide a heat absorption device, a battery pack and an electrical device, which are used to solve the technical problem in the prior art that thermal runaway of a battery cell easily leads to heat diffusion.

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

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

A beam structure, wherein the beam structure is provided with a channel, and a heat exchange medium is arranged in the channel,

A heat conducting member is arranged on the inner wall of the channel and is in thermal contact with the heat exchange medium to reduce the heat of the beam structure.

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

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

Optionally, the heat conducting member is arranged 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.

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

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 relative 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.

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 heat exchange medium in the plurality of cavities generates gas after absorbing heat, and an exhaust port is provided on the beam structure.

Optionally, an exhaust pipe is provided at the exhaust port for exhausting the gas, and the exhaust pipe 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.

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

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

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

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

case;

A plurality of battery cells, wherein the plurality of battery cells are accommodated in the housing;

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.

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.

Optionally, there is an air gap between the beam structure and the battery cell to prevent heat transfer between adjacent battery cells.

Optionally, the shell 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.

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

The heat absorption device, battery pack and electrical equipment provided by the present application are characterized in that the heat absorption device is arranged between adjacent battery cells and is thermally connected to the shell accommodating the battery cells. A channel is arranged 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 diffusion events caused by heat of the thermal runaway battery cells being conducted to the adjacent battery cells through the shell, a heat conductor is arranged on the inner wall of the channel of the beam structure 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 of the battery cells and improving the safety and reliability of the battery pack.

BRIEF DESCRIPTION OF THE DRAWINGS

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.

FIG1 is an exploded view of the battery pack structure provided in the present application;

FIG2 is a perspective view of a heat sink provided by the present application;

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

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

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

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

FIG7 is a schematic diagram of a heat conducting member of a heat absorbing device with air holes according to an embodiment;

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

FIG9 is a schematic structural diagram of a heat-absorbing device with a stamped groove heat-conducting member according to an embodiment;

Description of reference numerals:

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

4-battery pack; 40-battery cell; 51-upper cover; 52-tray; 53-cooling structure.

DETAILED DESCRIPTION

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.

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.

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 related listed items.

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" 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 device or original 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.

In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

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.

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. The channel 11 contains a phase change material. The phase change material absorbs the 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 the heat from the upper end surface and the lower end surface of the beam structure 10 to the phase change material.

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

The present application also provides a battery pack 4, as shown in FIG1. In general, the battery pack 4 includes a plurality of battery cells 40 and a shell for accommodating the plurality of battery cells 40. The shell generally includes a tray 52 and an upper cover plate 51. The upper cover plate 51 is arranged on the upper part of the battery cell 40 and cooperates with the tray 52 to form a shell to protect the battery. In the case of thermal runaway of a battery cell 40, there are two paths for the thermal runaway battery cell 40 to conduct heat to the adjacent battery cell 40. One is that the opposite surfaces between the adjacent battery cells 40 can transfer heat; the other is that the thermal runaway battery cell 40 transfers heat to the shell, and the shell transfers heat to the adjacent battery cell 40. There is a heat sink 1 between the adjacent battery cells 40. The heat sink 1 is thermally connected to at least one end face of the shell, and is used to absorb the heat of the shell end face thermally connected to the heat sink 1, so as to reduce the risk of the thermal runaway battery cell 40 transferring heat to the adjacent battery cell 40 through the shell, causing heat diffusion. It should be noted that the battery cell 40 may refer to a module composed of multiple battery cells arranged in an array (as shown in FIG1).

As shown in FIG. 1 , 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 .

In one embodiment, there are multiple heat absorption devices 1, which are arranged at intervals between multiple battery cells 40, and 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.

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.

In one embodiment, there is an air gap between the battery cell 40 and the heat absorption device 1. The air gap has a certain heat insulation effect and can effectively suppress the heat transfer in the heat conduction path between adjacent battery cells 40. The heat absorption device 1 can absorb the heat of the upper cover plate 51 and the tray 52 in time to cool down, and can also effectively reduce the probability of heat spread.

As shown in FIG1 , in one embodiment, the upper cover plate 51 and/or the tray 52 are provided with a cooling structure 53, and the cooling structure 53 is used to reduce the temperature of the end face of the battery cell 40. It can be understood that when the heat absorbing device 1 is thermally connected to at least one end face of the shell, for example, the heat absorbing device 1 is thermally connected to the tray 52, the upper cover plate 51 is provided with a cold plate to reduce the temperature of the thermal runaway battery cell 40 transferred to the upper cover plate 51, and the tray 52 can be provided with a cold plate; when the heat absorbing device 1 is thermally connected to the upper cover plate 51, the tray 52 is provided with a cold plate to reduce the temperature of the thermal runaway battery cell 40 transferred to the tray 52, and the upper cover plate 51 can be provided with a cold plate.

The present application also provides a heat absorption device 1, as shown in FIG2, the heat absorption device 1 includes: a beam structure 10, a channel 11 is provided, and a heat exchange medium is arranged in the channel 11; a heat conductor 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. It can be understood that the heat conductor 20 is arranged on the inner wall of the channel 11 of the beam structure 10, and a heat exchange medium is arranged in the channel 11 of the beam structure 10. 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 case of thermal runaway of a battery cell 40, the heat exchange medium in the beam structure 10 can quickly absorb the heat transferred from the thermal runaway battery, reduce the heat of the thermal runaway battery cell 40 to be transferred to other adjacent battery cells 40, and can effectively reduce the probability of heat diffusion. However, the simple beam structure 10 cannot effectively suppress the heat transfer 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.

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 accumulation of 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 of the inner wall of the channel 11 in the beam structure 10, and/or the lower end surface. 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.

In one embodiment, the heat conductor 20 is a plurality of linearly arranged plates. It is understandable that the beam structure 10 is usually a slender structure, and the heat conductors 20 are linearly arranged along the length of the beam structure 10, and can be arranged at equal intervals or at non-equal intervals, for example, the heat conductors 20 are densely arranged in the part where the battery pack 4 is difficult to dissipate heat, such as being densely arranged in the middle area along the length of the battery cell 40. Optionally, the heat conductors 20 can be arranged at intervals along the thickness direction of the beam structure 10, or can be arranged at intervals along the length direction of the beam structure 10.

Preferably, the heat conducting members 20 are arranged at intervals along the thickness direction of the beam structure 10, where the thickness direction of the beam structure 10 refers to the relative direction of two adjacent battery cells 40. The heat conducting members 20 are arranged at intervals along the relative direction of the battery cells 40, which can effectively block the heat transfer between the battery cells 40.

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 .

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.

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 on the upper end surface of the beam structure 10 in time.

Optionally, as shown in FIG5 , the heat conductive member 20 is disposed 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, and 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, and the heat conductive member 20 on the upper end surface and the heat conductive member 20 on the lower end surface are arranged alternately, so as to reduce the temperature of the upper and lower end surfaces of the beam structure 10. The length of the heat conductive member 20 is greater than half of the height of the channel 11 and less than the height of the channel 11, and the heat conductive member 20 on the upper end surface and the heat conductive member 20 on the lower end surface are interlaced with each other; when the length of the heat conductive member 20 is less than half of 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 conductive member 20 is smaller than the height of the channel 11. When the raw materials for preparing the same heat conductive member 20 are used, a larger number of shorter heat conductive members 20 can be provided. The more heat conductive members 20 there are on the end face, the better the heat conductive effect. Therefore, while ensuring the realization of the heat conductive function, it is beneficial to save the preparation cost.

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 are in contact with each other. Optionally, as shown in FIG2 , the heat conducting member 20 is vertically disposed 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 .

As shown in FIG. 6 , optionally, the heat conducting member 20 may also 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 improve the strength of the beam structure 10 .

In one embodiment, the heat conducting member 20 is made of one of 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.

In one embodiment, the heat conductor 20 is an arc-shaped or grooved plate. As shown in FIG8 , the heat conductor 20 is optionally an arc-shaped plate; as shown in FIG9 , the heat conductor 20 is optionally a plate with a stamped groove. It is understood that setting the heat conductor 20 to an arc-shaped or grooved plate can increase the heat exchange area between the heat conductor 20 and the heat absorbing material, improve the heat conduction rate and heat absorption efficiency, and the plate with grooves can be made by flat plate stamping.

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

When the heat conducting member 20 is connected to the upper end face and the lower end face at the same time, the heat conducting member 20 divides the channel 11 into several independent cavities 12, and the phase change material absorbs heat to generate gas, as shown in FIG7 , it is necessary to set a through hole 21 on the heat conducting member 20 to connect the several cavities 12, so that the gas generated after the phase change material absorbs heat can be discharged through the through hole 21, so as to avoid excessive gas pressure after the phase change in the beam structure 10 absorbs heat, which may cause danger. In addition, when the channel 11 is divided into several independent cavities 12, the phase change material can be replenished through the through hole 21 after the phase change absorbs heat to volatilize or sublimate.

Optionally, as shown in FIG3 , an exhaust port 30 is provided on the beam structure 10, and an exhaust pipe 31 is provided at the exhaust port 30, and the exhaust pipe 31 is used to discharge the gas generated after the phase change material absorbs heat during phase change. If the phase change material is liquid at room temperature, the phase change material absorbs heat during phase change and becomes gaseous. At this time, it is necessary to set a plurality of through holes 21 on the heat conducting member 20, or a through hole 21 with a larger size, and it is also necessary to set an exhaust port 30 and an exhaust pipe 31 with a larger size to meet the exhaust needs.

Optionally, the exhaust duct 31 can be directly connected to the exhaust channel 11 or the 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.

Optionally, a corresponding switch valve (not shown in the drawings) is provided on the side of the exhaust pipe 31 away from the exhaust port 30, which can be opened when the air pressure inside the beam structure 10 exceeds a threshold value, so as to discharge the gas generated by the phase change endothermic in time, effectively reducing the beam pressure. The air pressure inside the structure 10 reduces the probability of safety accidents caused by excessive air pressure due to phase change heat absorption. In addition, at room temperature or when the battery cell 40 does not experience thermal runaway, a switch valve is provided to provide a relatively closed space for the phase change material to prevent the phase change material from volatilizing or external dust from entering.

Specifically, a diaphragm is provided on one side of the exhaust pipe 31 away from the exhaust port 30, and the diaphragm may be made of metal material, 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 air pressure rises to a threshold value, for example, 0.5 MPa, reaching the detonation pressure of the diaphragm, the diaphragm ruptures, and the gas is directly discharged out of the package through the exhaust port 30 and the exhaust pipe 31. The diaphragm can automatically rupture when the air pressure reaches the threshold value to allow the gas to be discharged without the need for additional manual operation.

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 (16)

A heat absorbing device (1), characterized in that the heat absorbing 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). The heat absorption device (1) according to claim 1 is characterized in that the heat conducting member (20) is a plurality of linearly arranged plates. The heat absorption device (1) according to claim 2 is characterized in that the heat conducting members (20) are arranged at intervals along the thickness direction of the beam structure (10). The heat absorption device (1) according to any one of claims 1 to 3 is 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 less than the height of the channel (11). The heat absorption device (1) according to any one of claims 1 to 3 is characterized in that the heat conducting member (20) is arranged between the upper end surface and the lower end surface of the channel (11), and 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. The heat absorption device (1) according to any one of claims 1 to 3 is 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 at the upper end surface and the heat conducting member (20) located at the lower end surface respectively extend in opposite directions, the heat conducting member (20) located at the upper end surface and the heat conducting member (20) located at 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 of the height of the channel (11) and less than the height of the channel (11). The heat absorption device (1) according to any one of claims 4 to 6 is characterized in that the heat conducting member (20) divides the channel (11) into a plurality of cavities (12), the heat conducting member (20) is provided with a through hole (21) for conducting the gas generated after the heat exchange medium absorbs heat in the plurality of cavities (12), and the beam structure (10) is provided with an exhaust port (30). The heat absorption device (1) according to claim 7 is characterized in that an exhaust pipe (31) is provided at the exhaust port (30) for discharging the gas, and the exhaust pipe (31) is provided with a switch valve, and the switch valve is turned on when the gas pressure value of the gas reaches a threshold value, so that the gas is discharged to the outside of the heat absorption device (1). The heat absorption device (1) according to any one of claims 1 to 8, characterized in that the heat exchange medium is a phase change material. The heat absorption device (1) according to any one of claims 1 to 9, characterized in that the heat conducting member (20) is one of metal, graphite, graphene, aluminum oxide, and silicon carbide. The heat absorption device (1) according to any one of claims 1 to 10 is characterized in that the heat conducting member (20) is arc-shaped or a plate-shaped with grooves. A battery pack (4), characterized by comprising: 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. The battery pack (4) according to claim 12, characterized in that a heat conducting plate is arranged between the heat absorbing device (1) and the battery cell (40), for conducting the heat of the battery cell (40) to the heat absorbing device (1), thereby reducing the heat of the battery cell (40). temperature. The battery pack (4) according to claim 12 is characterized in that an air gap exists between the beam structure (10) and the battery cell (40) to block heat transfer between adjacent battery cells (40). The battery pack (4) according to any one of claims 12 to 14, characterized in that the shell includes an upper cover plate (51) and a tray (52), and the upper cover plate (51) and/or the tray (51) are provided with a cooling structure (53), and the cooling structure (53) is used to reduce the temperature of the end surface of the battery cell (40). An electrical device, characterized in that it comprises a battery pack (4) as described in any one of claims 12 to 15 and an electrical device, wherein the battery pack is used to supply power to the electrical device.