Battery assembly

Abstract

The application relates to the technical field of batteries, in particular to a battery assembly. The battery assembly comprises a box cover, a cooling plate, a battery cell and a cooling working medium. The cooling plate is connected with the box cover to form a containing space; the cooling plate comprises a hot end and a cold end and a plurality of cooling channels extending from the hot end to the cold end; the plurality of cooling channels are arranged at intervals and are independent and sealed from each other; the cooling plate further comprises a bending area arranged between the cold end and the hot end and a bending hole arranged in the bending area; the bending hole penetrates through the cooling plate along the thickness direction of the cooling plate; a flow sub-area is formed between two adjacent bending holes; the cooling channel reaches the cold end from the hot end through the flow sub-area; the battery cell is connected with the hot end in the containing space; the bending area and the cold end are arranged away from the battery cell; the cooling working medium is arranged in the cooling channel; the cooling working medium generates a phase change in the cooling plate due to a temperature difference; wherein the cooling plate is bent at the bending area, so that the liquid cooling working medium can flow to the hot end under the action of gravity at the cold 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 affects 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 a 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 cooling plate's flow channel and exchanges heat with the battery cells, it absorbs heat from the cells, creating a temperature difference between the inlet and outlet. This temperature difference increases with the length of the flow channel and the heat generated by the cells, leading to larger temperature differences within the cell body, impacting the battery's consistency and service life. 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.

[0003] Furthermore, due to the limited heat transfer capacity of the coolant, the coolant temperature must be lowered to maintain the maximum cell temperature within the operating temperature threshold. This causes the liquid cold plate temperature to be significantly lower than the ambient air temperature. In high-temperature and high-humidity environments, condensation is very likely to form on the cold plate surface. This condensation can degrade the insulation performance of the battery cells and electrical systems, potentially causing serious safety hazards such as electrical breakdown or even short circuits. Summary of the Invention

[0004] The present application provides a battery assembly to solve some or all of the deficiencies in the related art.

[0005] The present application provides a battery assembly, comprising:

[0006] box lid;

[0007] A cooling plate connected with the box cover to form a containing space of the battery assembly; the cooling plate comprises a hot end and a cold end, and a plurality of cooling channels extending from the hot end to the cold end; the plurality of cooling channels are arranged at intervals and are independent and sealed from each other; the cooling plate further comprises a bending area arranged between the cold end and the hot end, and a bending hole arranged in the bending area; the bending hole penetrates through the cooling plate along the thickness direction of the cooling plate; the number of the bending hole is a plurality; the plurality of bending holes are arranged at intervals and form a flow sub-area between adjacent two bending holes; the cooling channel reaches the cold end from the hot end through the flow sub-area;

[0008] An electric core arranged in the containing space; the electric core is connected with the hot end; the bending area and the cold end are arranged away from the electric core; and,

[0009] A cooling working medium arranged in the cooling channel; the cooling working medium receives heat from the electric core at the hot end and generates phase change from liquid state to gaseous state; the cooling working medium dissipates heat at the cold end and generates phase change from gaseous state to liquid state;

[0010] Wherein, the cooling plate is bent at the bending area, so that the liquid cooling working medium can flow to the hot end under the action of gravity at the cold end.

[0011] Further, the cooling channel comprises a plurality of protruding structures arranged on the inner wall of the cooling channel; the protruding structures extend from the hot end to the cold end; the plurality of protruding structures are uniformly distributed around the extension axis of the cooling channel.

[0012] Further, the size of the cooling channel in the thickness direction of the cooling plate is 8 mm; the thickness of the cooling plate is 12 mm.

[0013] Further, the cooling plate further comprises a plurality of weight-reducing channels extending from the hot end to the cold end; the flow area of the weight-reducing channel is larger than that of the cooling channel; the plurality of weight-reducing channels and the plurality of cooling channels are arranged alternately; the plurality of weight-reducing channels are independent and sealed from each other; the weight-reducing channel reaches the cold end from the hot end through the flow sub-area.

[0014] Further, the weight-reducing channel is arranged away from the electric core in the thickness direction of the cooling plate.

[0015] Further, the cooling plate further comprises:

[0016] a first heating channel extending from the hot end toward the cold end; a first inlet of the first heating channel communicating with the bent hole, and a first outlet of the first heating channel communicating with the outside at an end face of the hot end away from the cold end;

[0017] a second heating channel extending from the hot end toward the cold end; a second outlet of the second heating channel communicating with the bent hole, and a second inlet of the second heating channel communicating with the outside at an end face of the hot end away from the cold end; the first heating channel and the second heating channel being spaced apart;

[0018] The battery assembly further comprises:

[0019] An evaporator and an evaporation pipeline; the evaporator is fixed at a position of the hot end close to the bending area; one end of the evaporation pipeline is connected to the evaporator, and the other end is connected to the evaporator after passing through the first inlet, the first outlet, the second inlet and the second outlet in sequence, and then passing through the cooling plate to form a heating circuit; a heat exchange medium is provided in the heating circuit.

[0020] Furthermore, the diameter of the heating channel is greater than or equal to 2 mm and less than or equal to 8 mm.

[0021] Furthermore, the cooling plate further comprises:

[0022] A third heating channel extends from the hot end toward the cold end; one end of the third heating channel is connected to the bending hole, and the other end is connected to the outside at the end surface of the hot end away from the cold end; the number of the third heating channels is an even number; one end of the evaporation pipeline is connected to the evaporator, and the other end passes through the first inlet, the first outlet, multiple third heating channels, the second inlet and the second outlet in sequence, and then passes through the cooling plate and is connected to the evaporator to form a heating circuit.

[0023] Furthermore, the cooling plate also includes a plurality of weight-reducing channels extending from the hot end to the cold end; the flow area of ​​the weight-reducing channel is larger than the flow area of ​​the cooling channel and the flow area of ​​the heating channel; the weight-reducing channel is located between the heating channel and the cooling channel.

[0024] Furthermore, the battery assembly also includes a heat-conducting layer; the heat-conducting layer is arranged between the battery core and the cooling plate, and contacts the battery core and the cooling plate respectively; the heat-conducting layer is heat-conducting silicone.

[0025] The technical solutions provided by the embodiments of the present application may have the following beneficial effects:

[0026] The cooling cycle of the battery assembly of the present application can omit pumping devices such as compressors, thereby avoiding excessive energy consumption of the system caused by the continuous operation of the pumping device. In addition, in some schemes, the battery assembly is cooled by low-temperature coolant, and the coolant flows in the flow channel to produce continuous heat exchange with the battery cell, so a temperature difference of the coolant is generated between the inlet and outlet of the coolant, thereby causing a temperature difference in the battery cell. 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, so the heat dissipation effect of the cooling medium on the battery cell at various positions in the cooling channel is more uniform, which is conducive to avoiding excessive temperature differences in the battery cell. In addition, since the cooling medium of the present application does not need to ensure the cooling effect by lowering the temperature, it can avoid the condensation of condensed water on the surface caused by excessive temperature difference between the cooling plate and the outside air. Condensed water reduces the insulation performance of the battery cell and the electrical system, resulting in serious safety risks of electrical breakdown or even short circuit. Furthermore, the cooling channels of the present application are independent and sealed, so the cooling plate does not need to be provided with joints for the liquid inlet and outlet, thereby effectively avoiding leakage or penetration of the cooling medium at the joints, which may cause the insulation capacity of the battery components to decrease or even short circuit.

[0027] 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

[0028] 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.

[0029] Figure 1 Shown is an overall schematic diagram of an embodiment of a battery assembly of the present application;

[0030] Figure 2 Shown as Figure 1 An enlarged partial view of the battery assembly shown;

[0031] Figure 3 Shown is an overall schematic diagram of an embodiment of a cooling plate of a battery assembly of the present application;

[0032] Figure 4 Shown as Figure 3 A perspective schematic diagram of a cooling plate is shown, wherein the internal cooling channels and heating channels are visible;

[0033] Figure 5 Shown as Figure 3 Another overall schematic diagram of the cooling plate shown;

[0034] Figure 6 A partial cross-sectional simplified diagram showing one embodiment of the battery assembly of the present application.

[0035] Legend of reference signs:

[0036] 100 battery assembly, 1 box cover, 2 cooling plate, 21 hot end, 22 cold end, 23 cooling channel, 231 protruding structure, 24 bending area, 25 bending hole, 26 flow sub-area, 27 weight-reducing channel, 281 first heating channel, 282 second heating channel, 283 third heating channel, 3 accommodation space, 4 battery cell, 5 evaporator, 6 evaporation pipeline, 7 heat-conducting layer, X length direction, Y width direction, Z height direction. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments (or, “modes of implementation”) of the present application will be described clearly and completely in conjunction with the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated.

[0038] If the embodiments of the present application involve directional indications or positional relationships (for example, up, down, left, right, front, back, inner, outer, 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 relationships, movement conditions, etc. between components in a certain specific posture (as shown in the drawings); if the specific posture changes, the directional indications or positional relationships also change accordingly. In addition, the embodiments of the present application involve the terms “first”, “second”, etc., which are only used for convenience of description and cannot be understood as indicating or implying relative importance.

[0039] Reference Figures 1-6 The present application provides a battery assembly 100. The battery assembly 100 can be a vehicle battery, an airplane battery, etc. The present application is not limited thereto.

[0040] The battery assembly 100 includes a case cover 1, a cooling plate 2, and battery cells 4. The cooling plate 2 is connected to the case cover 1 to form a storage space 3 for the battery assembly 100. The cooling plate 2 includes a hot end 21 and a cold end 22, as well as multiple cooling channels 23 extending from the hot end 21 to the cold end 22. The multiple cooling channels 23 are spaced apart, independent of each other, and sealed. The cooling plate 2 also includes a bending region 24 disposed between the cold end 22 and the hot end 21, and a bending hole 25 disposed in the bending region 24. The bending hole 25 extends through the cooling plate 2 along the thickness direction of the cooling plate 2. There are multiple bending holes 25. The multiple bending holes 25 are spaced apart from each other, and a flow sub-region 26 is formed between two adjacent bending holes 25. The cooling channel 23 extends from the hot end 21 through the flow sub-region 26 to the cold end 22. The battery cell 4 is disposed in the storage space 3. The battery cell 4 is connected to the hot end 21. The bending region 24 and the cold end 22 are disposed away from the battery cell 4.

[0041] The battery assembly 100 further includes a coolant disposed in the cooling channel 23. The coolant receives heat from the battery cells 4 at the hot end 21 and undergoes a phase transition from liquid to gas. The coolant dissipates heat at the cold end 22 and undergoes a phase transition from gas to liquid. The cooling plate 2 is bent at the bend region 24 to allow the liquid coolant at the cold end 22 to flow toward the hot end 21 under the influence of gravity.

[0042] When the temperature of the battery cell 4 is too high, the heat of the battery cell 4 is conducted to the cooling plate 2, and then the heat is conducted to the cooling medium in the cooling channel 23. 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 4. Since the heat source battery cell 4 is placed away from the cold end 22, the temperature of the cold end 22 is lower than the hot end 21. Therefore, the cooling medium at the cold end 22 has a tendency to dissipate heat and undergo a phase change to become a liquid. Liquid cooling medium has a tendency to move in the direction of gravity under the action of gravity. The cooling plate 2 of the present application sets a bending area 24 so that the cold end 22 can be higher than the hot end 21 in the direction of gravity, so that the liquid cooling medium flows toward the hot end 21 under the action of gravity. The volume of the sealed cooling channel 23 is fixed, so the gaseous cooling medium at the hot end 21 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 at the cold end 22 has a tendency to flow toward the hot end 21 under the action of gravity, the cooling medium has a self-driven property in the cooling channel 23, and there is no need to set up other pumping devices to pump the cooling medium.

[0043] By setting it this way, the cooling cycle of the battery assembly 100 can omit pumping devices such as compressors, thereby avoiding excessive energy consumption of the system caused by the continuous operation of the pumping device. In addition, in some schemes, the battery assembly 100 is cooled by low-temperature coolant. The coolant flows in the flow channel and generates continuous heat exchange with the battery cell 4. Therefore, a temperature difference of the coolant is generated between the inlet and outlet of the coolant, thereby causing a temperature difference in the battery cell 4. 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. Then the cooling effect of the cooling medium on the battery cell 4 at various positions of the cooling channel 23 is more uniform, which is conducive to avoiding excessive temperature difference of the battery cell 4. In addition, since the cooling medium of the present application does not need to ensure the cooling effect by lowering the temperature, it can avoid the condensation of condensed water on the surface caused by excessive temperature difference between the cooling plate 2 and the outside air. Condensed water reduces the insulation performance of the battery cell 4 and the electrical system, resulting in serious safety risks of electrical breakdown or even short circuit. Furthermore, the cooling channel 23 of the present application is independent and sealed, so the cooling plate 2 does not need to be provided with a joint for the liquid inlet and outlet, thereby effectively avoiding leakage or penetration of the cooling medium at the joint, which may cause the insulation capacity of the battery assembly 100 to decrease or even a short circuit.

[0044] In various embodiments of the present application, the extension from the hot end 21 to the cold end 22 , or the extension from the cold end 22 to the hot end 21 , should be understood as extending along the length direction X shown in the drawings.

[0045] The present application does not impose any restrictions on the bending angle of the bending region 24. The bending region 24 may be as follows: Figure 1 As shown, the cold end 22 forms a 90° angle with the hot end 21. Alternatively, in other embodiments, the angle between the cold end 22 and the hot end 21 can be any value, such as 30°, 45°, 60°, 75°, 105°, 120°, 135°, 150°, 175°, etc. The hot end 21 and the cold end 22 only need to differ in height in the Z direction, and the cold end 22 must be higher than the hot end 21 in the direction of gravity.

[0046] When multiple battery assemblies 100 are stacked along the height direction Z, the bending holes 25 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 25, thereby removing heat from the multiple battery assemblies 100 at the cold end 22, improving the heat dissipation efficiency of the gas-phase cooling medium at the cold end 22, and further improving the efficiency of the cooling medium in the gas-phase at the cold end 22 changing into a liquid phase.

[0047] Combine Figures 2 to 5In some optional embodiments, the cooling plate 2 further includes heating channels. The heating channels include a first heating channel 281 and a second heating channel 282. The first heating channel 281 extends from the hot end 21 toward the cold end 22. The first inlet of the first heating channel 281 communicates with the bent hole 25, and the first outlet of the first heating channel 281 communicates with the outside world at the end face of the hot end 21 facing away from the cold end 22. The second heating channel 282 extends from the hot end 21 toward the cold end 22. The second outlet of the second heating channel 282 communicates with the bent hole 25, and the second inlet of the second heating channel 282 communicates with the outside world at the end face of the hot end 21 facing away from the cold end 22. The first heating channel 281 and the second heating channel 281 are spaced apart. The battery assembly 100 further includes an evaporator 5 and an evaporation line 6. The evaporator 5 is fixed to the hot end 21 near the bent region 24. One end of the evaporation line 6 is connected to the evaporator 5, and the other end passes through the cooling plate 2 via the first inlet, first outlet, second inlet, and second outlet in sequence, and then connects to the evaporator 5, forming a heating circuit. A heat exchange medium is provided in the heating circuit.

[0048] The first heating channel 281 and the second heating channel 282 that pass through the evaporation line 6 allow the assembler to easily pass the evaporation line 6 through the first heating channel 281 and the second heating channel 282 when assembling the evaporation line 6 with the cooling plate 2, thereby achieving a simple connection of the evaporation line 6. Compared to the solution in which only one end of the first heating channel 281 and the second heating channel 282 are connected to the outside world and the other end is connected to the inside of the cooling plate 2, the embodiment of the present application can improve the ease of assembly. In addition, if the first heating channel 281 and the second heating channel 282 are connected inside the cooling plate 2, then the first heating channel 281 and the second heating channel 282 will occupy the space inside the cooling plate 2 in the width direction Y, making it difficult for the cooling channel 23 to be laid out and processed in this area and to achieve cooling of the battery cell 4.

[0049] The arrangement of the evaporator 5 and the evaporation line 6 provides the battery assembly 100 with a heating circuit. In low-temperature seasons, the heating circuit can provide a heating function for the battery cells 4, thereby increasing the available capacity and energy density of the battery in low-temperature environments.

[0050] Optionally, the heating channel also includes a third heating channel 283 extending from the hot end 21 toward the cold end 22. One end of the third heating channel 283 communicates with the folded hole 25, and the other end communicates with the outside world at the end face of the hot end 21 facing away from the cold end 22. The number of third heating channels 283 is even. The evaporation line 6 is connected to the evaporator 5 at one end, and connected to the evaporator 5 at the other end, passing through the cooling plate 2 via the first inlet, the first outlet, multiple third heating channels 283, the second inlet, and the second outlet, forming a heating circuit.

[0051] In other words, the heating channel between the first heating channel 281 and the second heating channel 282 in the width direction Y should be understood as the third heating channel 283. The provision of the third heating channel 283 can improve the heating uniformity within the cooling plate 2. Furthermore, the third heating channel 283 is designed to penetrate the non-bending area of ​​the cooling plate 2, which helps simplify the routing and assembly of the evaporation pipe 6.

[0052] The even number of third heating channels 283 ensures that the evaporation line 6 can ultimately enter the second heating channel 282 from the second inlet and then exit the cooling plate 2 through the second outlet to connect to the evaporator 5. This arrangement reduces the area of ​​the evaporation line 6 outside the cooling plate 2, thereby reducing heat loss caused by heat exchange between the evaporation line 6 and the outside air.

[0053] In some optional embodiments, the diameter of at least one of the first heating channel 281, the second heating channel 282, and the third heating channel 283 is greater than or equal to 2 mm and less than or equal to 8 mm. If the diameter is too small, the flow rate of the heat exchange medium increases, making it difficult for the circulation driving force to overcome the resistance. If the diameter is too large, the capillary force or gravity will weaken the reflux effect of the heat exchange medium, resulting in the liquid phase heat exchange medium being unable to effectively return to the evaporator 5, thereby interrupting heat transfer.

[0054] Combine Figure 6 Optionally, the cooling channel 23 includes a plurality of protruding structures 231 provided on the inner wall of the cooling channel 23. The protruding structure 231 extends from the hot end 21 to the cold end 22. The plurality of protruding structures 231 are evenly distributed around the extension axis of the cooling channel 23. The provision of the protruding structure 231 increases the contact area between the inner wall of the cooling channel 23 and the cooling medium, thereby enhancing the interaction between the inner wall of the cooling channel 23 and the liquid cooling medium. If the inner wall of the cooling channel 23 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 cooling channel 23 contains a gas-liquid two-phase mixed cooling medium, the liquid cooling medium has a tendency to flow along the inner wall of the cooling channel 23, causing the gaseous cooling medium to flow in the middle of the cooling channel 23. This arrangement can increase the flow rate of the cooling medium in the cooling channel 23, thereby increasing the rate at which the cooling medium reaches the cold end 22 from the hot end 21 to release heat and then returns to the hot end 21 to absorb heat, which is beneficial to improving the overall cooling effect of the battery assembly 100.

[0055] Optionally, the dimension of the cooling channel 23 in the thickness direction of the cooling plate 2 is 8 mm. The thickness of the cooling plate 2 is 12 mm. Figure 6As shown, the embodiment should be understood as the size of the cooling channel 23 in the height direction Z is 8mm, and the size of the cooling plate 2 in the height direction Z is 12mm. This arrangement can maximize the proportion of the cooling channel 23 in the height direction Z, thereby increasing the flow area of the cooling working medium. In this way, the cooling channel 23 can be filled with more cooling working medium to cool the battery cell 4, and there is enough space for flow. In addition, the cooling channel 23 can be arranged as close to the battery cell 4 as possible, thereby improving the heat exchange effect of the cooling working medium on the battery cell 4.

[0056] It should be understood that the flow cross section of the cooling channel 23 can be circular, and the diameter of the cooling channel 23 is 8mm. Alternatively, as shown, the flow cross section of the cooling channel 23 is shaped, and the embodiment should be understood as the maximum size of the cooling channel 23 in the height direction Z is 8mm. The shape of the flow cross section of the cooling channel 23 is not limited in the present application. Figure 6

[0057] In some alternative embodiments, the cooling plate 2 further comprises a plurality of weight-reducing channels 27 extending from the hot end 21 to the cold end 22. The flow area of the weight-reducing channel 27 is greater than the flow area of the cooling channel 23. The plurality of weight-reducing channels 27 and the plurality of cooling channels 23 are arranged alternately. The plurality of weight-reducing channels 27 are independent and sealed from each other. The weight-reducing channel 27 reaches the cold end 22 from the hot end 21 via the flow sub-area 26. The independent and sealed weight-reducing channel 27 can prevent foreign matter from entering the weight-reducing channel 27, thereby avoiding problems such as weight increase and rust of the cooling plate 2. In addition, the flow area of the weight-reducing channel 27 is greater than the flow area of the cooling channel 23, which can maximize the use of the space of the cooling plate 2, thereby reducing the overall weight of the battery assembly 100.

[0058] In the embodiment in which the battery assembly 100 comprises a heating channel, the flow area of the weight-reducing channel 27 is greater than the flow area of the cooling channel 23 and the flow area of the heating channel. The weight-reducing channel 27 is located between the heating channel and the cooling channel 23. This arrangement allows the weight-reducing channel 27 to isolate the cooling channel 23 and the heating channel, thereby preventing the cooling working medium in the cooling channel 23 from phase changing due to the heat exchange working medium in the heating channel, thereby reducing the cooling effect of the cooling working medium on the battery cell 4. Conversely, the weight-reducing channel 27 can prevent the cooling working medium in the cooling channel 23 from absorbing heat after phase changing, thereby reducing the heat loss of the heat exchange working medium, thereby reducing the heating effect of the heat exchange working medium.

[0059] ​Furthermore, optionally, the weight-reducing channel 27 is disposed away from the battery cells 4 in the thickness direction of the cooling plate 2. Air is present in the weight-reducing channel 27. Therefore, disposing the weight-reducing channel 27 away from the battery cells 4 prevents air from acting as a heat exchange medium and affecting the thermal management of the battery cells 4. For example, the centerline of the flow area of ​​the weight-reducing channel 27 is offset from the thickness center of the cooling plate 2 in the height direction Z and is located away from the battery cells 4.

[0060] In various embodiments, the battery assembly 100 further includes a thermally conductive layer 7. The thermally conductive layer 7 is disposed between the battery cells 4 and the cooling plate 2, and contacts both the battery cells 4 and the cooling plate 2. The thermally conductive layer 7 is made of thermally conductive silicone. The provision of the thermally conductive layer 7 can reduce the contact thermal resistance between the battery cells 4 and the cooling plate 2, thereby improving thermal management efficiency.

[0061] 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 cooling plate connected to the box cover to form a storage space for the battery assembly; the cooling plate includes a hot end and a cold end, and a plurality of cooling channels extending from the hot end to the cold end; the plurality of cooling channels are arranged at intervals, are independent of each other and are sealed; the cooling plate also includes a bending area arranged between the cold end and the hot end, and a bending hole arranged in the bending area; the bending hole penetrates the cooling plate along the thickness direction of the cooling plate; the number of the bending holes is multiple; the plurality of bending holes are arranged at intervals, and a flow sub-area is formed between two adjacent bending holes; the cooling channel reaches the cold end from the hot end through the flow sub-area; A battery cell is disposed in the accommodating space; the battery cell is connected to the hot end; the bending region and the cold end are disposed away from the battery cell; and A cooling medium is provided in the cooling channel; the cooling medium receives heat from the battery cell at the hot end and undergoes a phase change from liquid to gas; the cooling medium dissipates heat at the cold end and undergoes a phase change from gas to liquid; The cooling plate is bent in the bending area so that the liquid cooling medium at the cold end can flow to the hot end under the action of gravity; The cooling plate further comprises a heating channel; the heating channel comprises: a first heating channel extending from the hot end toward the cold end; a first inlet of the first heating channel communicating with the bent hole, and a first outlet of the first heating channel communicating with the outside at an end face of the hot end away from the cold end; a second heating channel extending from the hot end toward the cold end; a second outlet of the second heating channel communicating with the bent hole, and a second inlet of the second heating channel communicating with the outside at an end face of the hot end away from the cold end; the first heating channel and the second heating channel being spaced apart; The battery assembly further comprises: An evaporator and an evaporation pipeline; the evaporator is fixed at a position of the hot end near the bending area; one end of the evaporation pipeline is connected to the evaporator, and the other end passes through the cooling plate through the first inlet, the first outlet, the second inlet, and the second outlet in sequence, and is then connected to the evaporator to form a heating circuit; a heat exchange medium is provided in the heating circuit; The cooling plate further includes a plurality of weight-reducing channels extending from the hot end to the cold end; the weight-reducing channels are located between the heating channels and the cooling channels.

2. The battery assembly according to claim 1, wherein: The cooling channel includes a plurality of protruding structures arranged on the inner wall of the cooling channel; the protruding structures extend from the hot end to the cold end; and the plurality of protruding structures are evenly distributed around the extension axis of the cooling channel.

3. The battery assembly according to claim 1, wherein: The dimension of the cooling channel in the thickness direction of the cooling plate is 8 mm; the thickness of the cooling plate is 12 mm.

4. The battery assembly according to claim 1, wherein: The diameters of the first heating channel and the second heating channel are greater than or equal to 2 mm and less than or equal to 8 mm.

5. The battery assembly according to claim 1, wherein: The heating channel also includes: A third heating channel extends from the hot end toward the cold end; one end of the third heating channel is connected to the bending hole, and the other end is connected to the outside at the end surface of the hot end away from the cold end; the number of the third heating channels is an even number; one end of the evaporation pipeline is connected to the evaporator, and the other end passes through the first inlet, the first outlet, multiple third heating channels, the second inlet and the second outlet in sequence, and then passes through the cooling plate and is connected to the evaporator to form a heating circuit.

6. The battery assembly according to claim 1, wherein: The flow area of ​​the weight-reducing channel is larger than the flow areas of the cooling channel and the heating channel.

7. 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 cooling plate, and contacts the battery core and the cooling plate respectively; the heat-conducting layer is heat-conducting silica gel.

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