Battery assembly

Abstract

The invention relates to the technical field of batteries, in particular to a battery assembly. The battery assembly comprises a box cover, a heat exchange plate, a loop heat pipe and a battery cell. The heat exchange plate is connected with the box cover to form an accommodating space of the battery assembly; the heat exchange plate comprises a first end and a second end which are oppositely arranged in the length direction, and a loop channel penetrating through the first end and the second end. The number of the loop channels is at least four, and the loop channels are arranged in the width direction. Along the width direction, the loop channels are respectively a first channel, a second channel, a third channel and a fourth channel; the loop heat pipe comprises an evaporator and an evaporation pipeline; the evaporation pipeline enters the first channel through the first end and leaves through the second end, enters the second channel through the second end and leaves through the first end, enters the third channel through the first end and leaves through the second end, and enters the fourth channel through the second end and leaves through the first end.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery assembly. Background Art

[0002] In the field of battery technology, the thermal management performance of batteries directly impacts their safety, service life, and operating efficiency. Currently, mainstream battery thermal management methods rely on liquid cooling systems to transfer heat from the battery cells. This system removes heat generated by the battery cells by circulating coolant within the liquid cooling plate. However, the coolant circulation relies on the continuous operation of a compressor, which requires a continuous input of external energy. This results in high energy consumption for the entire thermal management system and hinders the energy efficiency of the battery system. Existing liquid cooling systems suffer from numerous technical drawbacks in practical applications. Firstly, as the coolant flows through the channels within the heat exchange plate, it absorbs heat from the battery cells, creating a temperature difference between the inlet and outlet. This temperature difference increases with the length of the channel and the heat generated by the cell, leading to larger temperature differences within the cell itself, impacting the consistency and service life of the battery. Secondly, the battery assembly requires inlet and outlet joints, which are prone to coolant leakage or seepage, directly compromising the insulation level of the battery assembly and even causing serious safety risks such as battery short circuits. Summary of the Invention

[0003] The present application provides a battery assembly to solve some or all of the deficiencies in the related art.

[0004] The present application provides a battery assembly, comprising: box lid; a heat exchange plate connected to the box cover to form a housing for the battery assembly; the heat exchange plate includes a first end and a second end disposed opposite each other along a length direction, and a loop channel passing through the first and second ends; the loop channels are at least four and arranged along a width direction; the width direction is perpendicular to the length direction; along the width direction, the loop channels are respectively a first channel, a second channel, a third channel, and a fourth channel; A loop heat pipe, comprising an evaporator and an evaporation pipe; the evaporator is fixed to a position near the first end of the heat exchange plate, and comprises an inlet end and an outlet end; one end of the evaporation pipe is sealedly connected to the inlet end, and the other end is sealedly connected to the outlet end; wherein, the evaporation pipe enters the first channel via the first end and leaves through the second end, enters the second channel via the second end and leaves through the first end, enters the third channel via the first end and leaves through the second end, enters the fourth channel via the second end and leaves through the first end; the loop heat pipe comprises a heat exchange medium; the capillary pressure of the capillary wick of the evaporator drives the heat exchange medium to circulate in the evaporation pipe and the evaporator; and, The battery core is arranged in the accommodating space and connected to the heat exchange plate.

[0005] Furthermore, the heat exchange plate further includes a bent plate connected to the first end; the heat exchange plate further includes: a plurality of heat exchange channels extending from the first end to the bent plate; the heat exchange channels and the loop channels are spaced apart; the plurality of heat exchange channels are independent of each other and sealed; the heat exchange plate further comprises a bent hole provided on the bent plate near the first end; the bent hole penetrates the heat exchange plate along the thickness direction of the heat exchange plate; the number of the bent holes is multiple; the plurality of bent holes are spaced apart from each other, and a flow sub-region is formed between two adjacent bent holes; the heat exchange channel reaches the bent plate from the first end via the flow sub-region; the end of the loop channel toward the first end is exposed from the bent hole; and, A cooling medium is arranged in the heat exchange channel; the cooling medium receives heat from the battery cell at the first end and undergoes a phase change from liquid to gas; the cooling medium dissipates heat at the bending plate and undergoes a phase change from gas to liquid; wherein the bending plate is bent so that the liquid cooling medium can flow toward the first end at the bending plate under the action of gravity.

[0006] Furthermore, the heat exchange channel includes a plurality of protruding structures arranged on the inner wall of the heat exchange channel; the protruding structures extend from the first end to the bending plate; and the plurality of protruding structures are evenly distributed around the extension axis of the heat exchange channel.

[0007] Furthermore, the dimension of the heat exchange channel in the thickness direction of the heat exchange plate is 8 mm; the thickness of the heat exchange plate is 12 mm.

[0008] Furthermore, the bent plate and the heat exchange plate are integrally formed.

[0009] Furthermore, the heat exchange plate also includes a plurality of weight-reducing channels extending along the length direction; the flow area of ​​the weight-reducing channels is larger than the flow area of ​​the heat exchange channel; the plurality of weight-reducing channels are independent and sealed from each other; the weight-reducing channels extend from the first end through the flow sub-area to the bending plate; along the width direction, a weight-reducing channel is arranged between the loop channel and the heat exchange channel.

[0010] Furthermore, the heat exchange plate also includes a plurality of weight-reducing channels extending along the length direction; the flow area of ​​the weight-reducing channels is larger than the flow area of ​​the loop channels; the plurality of weight-reducing channels and the plurality of loop channels are alternately arranged; the plurality of weight-reducing channels are independent and sealed from each other.

[0011] Furthermore, the weight-reducing channel is arranged away from the battery core in the thickness direction of the heat exchange plate.

[0012] Furthermore, the diameter of the loop channel is greater than or equal to 2 mm and less than or equal to 4 mm.

[0013] Furthermore, the battery assembly also includes a heat-conducting layer; the heat-conducting layer is arranged between the battery core and the heat exchange plate, and contacts the battery core and the heat exchange plate respectively; the heat-conducting layer is heat-conducting silica gel.

[0014] The technical solutions provided by the embodiments of the present application may have the following beneficial effects: The battery assembly of the present application is provided with a sealed loop heat pipe. The capillary pressure of the evaporator's capillary wick drives the heat exchange medium to circulate in the evaporation pipe and the evaporator. Therefore, the provision of the loop heat pipe enables the battery assembly to omit pumping devices such as compressors, thereby avoiding excessive energy consumption of the system caused by the continuous operation of the pumping device. The evaporation pipe of the present application is independent and sealed, so the heat exchange plate does not need to be provided with a joint for the liquid inlet and the liquid outlet, thereby effectively avoiding the problem of leakage or penetration of the heat exchange medium at the joint causing the insulation capacity of the battery assembly to decrease or even short circuit.

[0015] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 Shown is an overall schematic diagram of an embodiment of a battery assembly of the present application; Figure 2 Shown as Figure 1 An enlarged partial view of the battery assembly shown; Figure 3 Shown is an overall schematic diagram of an embodiment of a heat exchange plate of a battery assembly of the present application; Figure 4 Shown as Figure 3 A perspective schematic diagram of a heat exchange plate is shown, wherein the internal heat exchange channels and loop channels are visible; Figure 5 Shown as Figure 3 The overall schematic diagram of the heat exchange plate from another angle is shown; Figure 6Shown is a simplified partial cross-sectional view of an embodiment of a battery assembly of the present application.

[0018] Description of reference numerals: 100 battery assembly, 1 box cover, 2 heat exchange plate, 21 first end, 22 second end, 23 loop channel, 231 first channel, 232 second channel, 233 third channel, 234 fourth channel, 24 bent plate, 25 heat exchange channel, 251 protruding structure, 26 bent hole, 27 circulation sub-area, 28 weight reduction channel, 3 accommodating space, 4 loop heat pipe, 41 evaporator, 411 inlet end, 412 outlet end, 42 evaporation pipeline, 5 battery cells, 6 heat conductive layer, X length direction, Y width direction, Z height direction. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments (or "implementations") of the present application will be described clearly and completely here with reference to the accompanying drawings. In the following description, when referring to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0020] If there are terms in the embodiments of this application that refer to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the accompanying drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first" and "second" in the embodiments of this application are used only for descriptive convenience and should not be understood as indicating or implying relative importance.

[0021] like Figures 1-6 As shown, the present application provides a battery assembly 100. The battery assembly 100 can be a vehicle battery, an aircraft battery, etc. The present application is not limited thereto.

[0022] The battery assembly 100 includes a box cover 1, a heat exchange plate 2, a loop heat pipe and a battery cell 5. The heat exchange plate 2 is connected to the box cover 1 to form a storage space 3 for the battery assembly 100. The heat exchange plate 2 includes a first end 21 and a second end 22 arranged opposite to each other along the length direction X, and a loop channel 23 passing through the first end 21 and the second end 22. There are at least four loop channels 23, which are arranged along the width direction Y. The width direction Y is perpendicular to the length direction X. Along the width direction Y, the loop channels 23 are respectively a first channel 231, a second channel 232, a third channel 233 and a fourth channel 234. The loop heat pipe 4 includes an evaporator 41 and an evaporation pipe 42. The evaporator 41 is fixed to the heat exchange plate 2 near the first end 21, and includes an inlet end 411 and an outlet end 412. One end of the evaporation pipe 42 is sealed to the inlet end 411, and the other end is sealed to the outlet end 412. The evaporation line 42 enters the first channel 231 via the first end 21 and exits through the second end 22, then enters the second channel 232 via the second end 22 and exits through the first end 21, then enters the third channel 233 via the first end 21 and exits through the second end 22, and finally enters the fourth channel 234 via the second end 22 and exits through the first end 21. The loop heat pipe 4 includes a heat exchange medium. The capillary pressure of the capillary wick of the evaporator 41 drives the heat exchange medium to circulate within the evaporation line 42 and the evaporator 41. The battery cell 5 is disposed in the accommodating space 3 and connected to the heat exchange plate 2.

[0023] The through loop channel 23 allows the assembler to easily pass the evaporation pipe 42 through the loop channel 23 when assembling the evaporation pipe 42 with the heat exchange plate 2, thereby achieving a simple connection of the evaporation pipe 42. Compared with the solution in which only one end of the multiple loop channels 23 is connected to the outside world and the other end is connected to the inside of the heat exchange plate 2, the embodiment of the present application can improve the ease of assembly. The arrangement of the evaporator 41 and the evaporation pipe 42 enables the battery assembly 100 to have a heating circuit. In low-temperature seasons, the heating circuit can provide a heating function for the battery cell 5, thereby increasing the available capacity and energy density of the battery in a low-temperature environment. The distribution of multiple loop channels 23 along the width direction Y can improve the temperature uniformity of the heat exchange plate 2, thereby improving the heating effect. When the battery cell 5 is in a heat dissipation condition, such as a high-temperature environment, the pipe on one side of the contact area with the battery cell 5 is the evaporation end, and the pipe on the other side is the condensation end. When the effect of the temperature difference between the evaporation end and the condensation end is greater than the starting temperature of the loop heat pipe 4, the loop heat pipe 4 starts automatically, and conducts the heat of the battery core 5 from the evaporation end to the condensation end, thereby achieving heat dissipation of the battery core 5.

[0024] The loop heat pipe is sealed, and the capillary pressure of the capillary core of the evaporator 41 drives the heat exchange medium to circulate in the evaporation pipe 42 and the evaporator 41. Therefore, the setting of the loop heat pipe allows the battery assembly 100 to omit pumping devices such as compressors, thereby avoiding excessive energy consumption of the system caused by the continuous operation of the pumping device. The evaporation pipe 42 of the present application is independent and sealed, so the heat exchange plate 2 does not need to be provided with a joint for the liquid inlet and the liquid outlet, thereby effectively avoiding the problem of leakage or penetration of the heat exchange medium at the joint causing the insulation capacity of the battery assembly 100 to decrease or even short circuit. In addition, the setting of the evaporator 41 can generate capillary force to pump the heat exchange medium, so the loop heat pipe 4 has the ability to reverse gravity, so that the direction of the evaporation pipe 42 is not spatially restricted.

[0025] In the embodiment where the number of the loop channels 23 is greater than four, the number of the loop channels 23 is an even number, such as six, eight, or ten. This application is not limited thereto.

[0026] In some optional embodiments, the heat exchange plate 2 further includes a bent plate 24 connected to the first end 21. The heat exchange plate 2 further includes a plurality of heat exchange channels 25 extending from the first end to the bent plate. The heat exchange channels 25 and the loop channel 23 are spaced apart. The plurality of heat exchange channels 25 are independent and sealed from each other. The heat exchange plate 2 further includes a bent hole 26 disposed on the bent plate 24 near the first end 21. The bent hole 26 penetrates the heat exchange plate 2 along the thickness direction of the heat exchange plate 2. There are multiple bent holes 26. The plurality of bent holes 26 are spaced apart from each other, and a flow sub-region 27 is formed between two adjacent bent holes 26. The heat exchange channel 25 extends from the first end through the flow sub-region 27 to the bent plate. The end of the loop channel 23 facing the first end 21 emerges from the bent hole 26. A cooling medium is disposed in the heat exchange channel 25. The cooling medium receives heat from the battery cell 5 at the first end and undergoes a phase change from liquid to gas. The cooling medium dissipates heat at the bending plate and undergoes a phase change from gas to liquid. The bending plate 24 is bent so that the liquid cooling medium can flow toward the first end under the action of gravity.

[0027] When the temperature of the battery cell 5 is too high, the heat of the battery cell 5 is transferred to the heat exchange plate 2, and then the heat is transferred to the cooling medium in the heat exchange channel 25. After the liquid cooling medium receives the heat, it undergoes a phase change to become a gas. During this process, the cooling medium absorbs heat, thereby reducing the temperature of the battery cell 5. Since the heat source battery cell 5 is placed away from the bending plate, the temperature of the bending plate is lower than the first end. Therefore, the cooling medium of the bending plate has a tendency to dissipate heat and undergo a phase change to become a liquid. Under the action of gravity, the liquid cooling medium has a tendency to move in the direction of gravity. The heat exchange plate 2 of the present application is provided with a bending plate 24, so that the bending plate can be higher than the first end in the direction of gravity, so the liquid cooling medium flows toward the first end under the action of gravity. The volume of the sealed heat exchange channel 25 is fixed, so the gaseous cooling medium at the first end not only has a tendency to move in the opposite direction of gravity compared to the liquid cooling medium, but also because the liquid cooling medium in the bent plate has a tendency to flow toward the first end under the action of gravity, the cooling medium has a self-driven property in the heat exchange channel 25, and there is no need to set up other pumping devices to pump the cooling medium.

[0028] In addition, in some embodiments, the battery assembly 100 is cooled by a low-temperature coolant. The coolant flows in the flow channel and continuously exchanges heat with the battery cells 5. Therefore, a temperature difference of the coolant is generated between the coolant inlet and the coolant outlet, thereby causing a temperature difference in the battery cells 5. The cooling medium of the present application absorbs heat through phase change, so the cooling effect of the cooling medium is less correlated with the temperature of the cooling medium itself. Therefore, the cooling effect of the cooling medium on the battery cells 5 at various positions in the heat exchange channel 25 is more uniform, which helps to avoid excessive temperature differences in the battery cells 5.

[0029] Combine Figure 6 Optionally, the heat exchange channel 25 includes a plurality of protruding structures 251 provided on the inner wall of the heat exchange channel 25. The protruding structure 251 extends from the first end to the bending plate. The plurality of protruding structures 251 are evenly distributed around the extension axis of the heat exchange channel 25. The provision of the protruding structures 251 increases the contact area between the inner wall of the heat exchange channel 25 and the cooling medium, thereby enhancing the interaction between the inner wall of the heat exchange channel 25 and the liquid cooling medium. If the inner wall of the heat exchange channel 25 is wetted by the cooling medium, the liquid molecules will be subjected to a stronger attraction from the solid molecules, resulting in a decrease in the molecular distance, forming an expansion trend, thereby promoting the spreading of the liquid along the wall. Since the heat exchange channel 25 contains a gas-liquid two-phase mixed cooling medium, the liquid cooling medium has a tendency to flow along the inner wall of the heat exchange channel 25, causing the gaseous cooling medium to flow in the middle of the heat exchange channel 25. This arrangement can increase the flow rate of the cooling medium in the heat exchange channel 25, thereby increasing the rate at which the cooling medium reaches the bending plate from the first end to release heat and then returns to the first end to absorb heat, which is beneficial to improving the overall cooling effect of the battery assembly 100.

[0030] In some optional embodiments, the diameter of the loop channel 23 is greater than or equal to 2 mm and less than or equal to 4 mm. If the diameter is too small, the flow rate of the heat exchange medium is increased, resulting in the circulation driving force being difficult to overcome the resistance. If the diameter is too large, the capillary force or gravity will weaken the reflux effect of the medium, resulting in the liquid phase heat exchange medium being unable to effectively return to the evaporator 41, thereby causing heat transfer interruption. It should be noted that the diameters of multiple loop channels 23 are the same, which can ensure the fit between the evaporation pipe 42 and the inner wall of the loop channel 23, and avoid the evaporation pipe 42 being difficult to assemble due to an overly small loop channel 23, and the air between the evaporation pipe 42 and the loop channel 23 being affected by an overly large heating pipe, thereby preventing heat exchange.

[0031] The present application does not impose any restrictions on the bending angle of the bending plate 24. The bending plate 24 can be as follows: Figure 1 As shown, the angle between the bent plate and the first end is 90°. Alternatively, in other embodiments, the angle between the bent plate and the first end can be any value, such as 30°, 45°, 60°, 75°, 105°, 120°, 135°, 150°, 175°, etc. The first end and the bent plate only need to have a height difference in the Z direction, and the bent plate must be higher than the first end in the direction of gravity.

[0032] When multiple battery assemblies 100 are stacked along the height direction Z, the bending holes 26 of the multiple battery assemblies 100 can be connected in the height direction Z. Subsequently, the battery assemblies 100 can be connected to a fan or other structure to allow cooling air to circulate through the bending holes 26, thereby removing heat from the multiple battery assemblies 100 at the bending plate, improving the heat dissipation efficiency of the gas-phase cooling medium at the bending plate, and further improving the efficiency of the cooling medium in the gas-phase converting from the bending plate to the liquid phase.

[0033] Optionally, the bent plate 24 and the heat exchange plate 2 are integrally formed. This integral formation of the bent plate 24 and the heat exchange plate 2 can improve the sealing of the heat exchange channel 25, preventing leakage of the cooling medium due to a gap at the connection between the bent plate 24 and the heat exchange plate 2, thereby reducing the cooling efficiency of the battery assembly 100 and potentially causing a short circuit risk.

[0034] Optionally, the dimension of the heat exchange channel 25 in the thickness direction of the heat exchange plate 2 is 8 mm. The thickness of the heat exchange plate 2 is 12 mm. Figure 6As shown, this embodiment should be understood as having a heat exchange channel 25 dimensioned 8 mm in the height direction Z and a heat exchange plate 2 dimensioned 12 mm in the height direction Z. This arrangement maximizes the proportion of the heat exchange channel 25 in the height direction Z, thereby increasing the area available for the cooling medium to circulate. This allows the heat exchange channel 25 to be filled with more cooling medium to cool the battery cells 5, while still leaving ample space for the medium to flow. Furthermore, the heat exchange channel 25 can be positioned as close as possible to the battery cells 5, thereby enhancing the heat exchange effect of the cooling medium on the battery cells 5.

[0035] It should be understood that the flow cross section of the heat exchange channel 25 can be circular, and the diameter of the heat exchange channel 25 is 8 mm. Figure 6 As shown, the flow cross section of the heat exchange channel 25 is irregularly shaped, so this embodiment should be understood as the maximum dimension of the heat exchange channel 25 being 8 mm in the height direction Z. This application does not specifically limit the shape of the flow cross section of the heat exchange channel 25.

[0036] In some optional embodiments, the heat exchange plate 2 further includes a plurality of weight-reducing channels 28 extending along the length direction X. The flow area of ​​the weight-reducing channel 28 is greater than the flow area of ​​the heat exchange channel 25. The plurality of weight-reducing channels 28 are independent and sealed from each other. The weight-reducing channel 28 passes through the flow sub-region 27 from the first end to the bending plate. Along the width direction Y, a weight-reducing channel 28 is provided between the loop channel 23 and the heat exchange channel 25. The weight-reducing channel 28 is independent and sealed, which can prevent foreign matter from entering the weight-reducing channel 28 and causing problems such as increased weight and rust of the heat exchange plate 2. The flow area of ​​the weight-reducing channel 28 is greater than that of the heat exchange channel 25, which can maximize the use of the space of the heat exchange plate 2, thereby reducing the overall weight of the battery assembly 100. The weight-reducing channel 28 is located between the loop channel 23 and the heat exchange channel 25. This arrangement allows the weight-reducing channel 28 to isolate the heat exchange channel 25 from the loop channel 23, thereby preventing the heat exchange medium in the loop channel 23 from causing a phase change in the cooling medium in the heat exchange channel 25, thereby reducing the cooling effect of the cooling medium on the battery cells 5. Conversely, the weight-reducing channel 28 can prevent the cooling medium in the heat exchange channel 25 from absorbing heat due to phase change, which would cause heat loss from the heat exchange medium, thereby reducing the heating effect of the heat exchange medium.

[0037] Of course, in the embodiment where the heat exchange plate 2 does not include the heat exchange channel 25, the heat exchange plate 2 may also include a weight reduction channel 28. The weight reduction channel 28 and the loop channel 23 are alternately arranged. This application will not elaborate on this.

[0038] Further, optionally, the weight-reducing channel 28 is disposed away from the battery cells 5 in the thickness direction of the heat exchange plate 2. Air exists in the weight-reducing channel 28. Therefore, disposing the weight-reducing channel 28 away from the battery cells 5 can prevent air from acting as a heat exchange medium and affecting the thermal management of the battery cells 5. For example, the centerline of the flow area of ​​the weight-reducing channel 28 is offset from the thickness center of the heat exchange plate 2 in the height direction Z and is located away from the battery cells 5.

[0039] In various embodiments, the battery assembly 100 further includes a thermally conductive layer 6. The thermally conductive layer 6 is disposed between the battery cells 5 and the heat exchange plate 2, and contacts both the battery cells 5 and the heat exchange plate 2. The thermally conductive layer 6 is made of thermally conductive silicone. The provision of the thermally conductive layer 6 can reduce the contact thermal resistance between the battery cells 5 and the heat exchange plate 2, thereby improving thermal management efficiency.

[0040] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application shall be included in the scope of protection of this application.

Claims

1. A battery assembly, characterized in that: include: box lid; a heat exchange plate connected to the box cover to form a housing space for the battery assembly; The heat exchange plate includes a first end and a second end oppositely disposed along a length direction, and a loop channel passing through the first end and the second end; the loop channels are at least four in number and arranged along a width direction; the width direction is perpendicular to the length direction; along the width direction, the loop channels are respectively a first channel, a second channel, a third channel, and a fourth channel; A loop heat pipe, comprising an evaporator and an evaporation pipe; the evaporator is fixed to a position near the first end of the heat exchange plate, and comprises an inlet end and an outlet end; one end of the evaporation pipe is sealedly connected to the inlet end, and the other end is sealedly connected to the outlet end; wherein, the evaporation pipe enters the first channel via the first end and leaves through the second end, enters the second channel via the second end and leaves through the first end, enters the third channel via the first end and leaves through the second end, enters the fourth channel via the second end and leaves through the first end; the loop heat pipe comprises a heat exchange medium; the capillary pressure of the capillary wick of the evaporator drives the heat exchange medium to circulate in the evaporation pipe and the evaporator; and, The battery core is arranged in the accommodating space and connected to the heat exchange plate.

2. The battery assembly according to claim 1, wherein: The heat exchange plate further includes a bent plate connected to the first end; the heat exchange plate further includes: a plurality of heat exchange channels extending from the first end to the bent plate; the heat exchange channels and the loop channels are spaced apart; the plurality of heat exchange channels are independent of each other and sealed; the heat exchange plate further comprises a bent hole provided on the bent plate near the first end; the bent hole penetrates the heat exchange plate along the thickness direction of the heat exchange plate; the number of the bent holes is multiple; the plurality of bent holes are spaced apart from each other, and a flow sub-region is formed between two adjacent bent holes; the heat exchange channel reaches the bent plate from the first end via the flow sub-region; the end of the loop channel toward the first end is exposed from the bent hole; and, A cooling medium is arranged in the heat exchange channel; the cooling medium receives heat from the battery cell at the first end and undergoes a phase change from liquid to gas; the cooling medium dissipates heat at the bending plate and undergoes a phase change from gas to liquid; wherein the bending plate is bent so that the liquid cooling medium can flow toward the first end at the bending plate under the action of gravity.

3. The battery assembly according to claim 2, wherein: The heat exchange channel includes a plurality of protruding structures arranged on the inner wall of the heat exchange channel; the protruding structures extend from the first end to the bent plate; and the plurality of protruding structures are evenly distributed around the extension axis of the heat exchange channel.

4. The battery assembly according to claim 2, wherein: The dimension of the heat exchange channel in the thickness direction of the heat exchange plate is 8 mm; the thickness of the heat exchange plate is 12 mm.

5. The battery assembly according to claim 2, wherein: The bent plate and the heat exchange plate are integrally formed.

6. The battery assembly according to claim 2, wherein: The heat exchange plate also includes a plurality of weight-reducing channels extending along the length direction; the flow area of ​​the weight-reducing channels is larger than the flow area of ​​the heat exchange channel; the plurality of weight-reducing channels are independent and sealed from each other; the weight-reducing channels extend from the first end through the flow sub-area to the bending plate; along the width direction, a weight-reducing channel is arranged between the loop channel and the heat exchange channel.

7. The battery assembly according to claim 1, wherein: The heat exchange plate further comprises a plurality of weight-reducing channels extending along the length direction; the flow area of ​​the weight-reducing channels is larger than the flow area of ​​the loop channels; the plurality of weight-reducing channels and the plurality of loop channels are alternately arranged; the plurality of weight-reducing channels are independent of and sealed from each other.

8. The battery assembly according to claim 6, wherein: The weight-reducing channel is arranged away from the battery core in the thickness direction of the heat exchange plate.

9. The battery assembly according to claim 1, wherein: The diameter of the loop channel is greater than or equal to 2 mm and less than or equal to 4 mm.

10. The battery assembly according to claim 1, wherein: The battery assembly further includes a heat-conducting layer; the heat-conducting layer is arranged between the battery core and the heat exchange plate, and contacts the battery core and the heat exchange plate respectively; the heat-conducting layer is heat-conducting silica gel.

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