Cooling device and battery pack

Abstract

This application relates to the field of battery manufacturing technology and discloses a cooling device and a battery pack. The cooling device has a first direction, a second direction, and a third direction that intersect each other, and includes cold plates and support members. At least two cold plates are provided, arranged sequentially along the first direction. The interior of each cold plate has a first channel and a second channel extending along the second direction, which are distributed along the third direction. Both the first and second channels have an inlet and an outlet end, with the direction from the inlet end to the outlet end of the first channel opposite to that of the second channel. At least one pair of support members are provided, each supporting any two adjacent cold plates. Each support member includes a first connecting channel and a second connecting channel. This application addresses the problem of varying cooling intensity in different areas of the cold plate, leading to significant temperature differences between battery cells in contact with the cold plate.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, specifically to a cooling device and a battery pack. Background Technology

[0002] Cylindrical lithium-ion battery cells are widely used in electric vehicles, energy storage systems, and other fields due to their advantages such as high energy density and controllable cost. However, battery cells generate heat during charging and discharging. If the temperature difference between battery cells is too large, it will significantly accelerate the aging rate of the battery cells, which is a key factor affecting the overall performance and lifespan of the battery pack.

[0003] Currently, a common technical solution for cooling cylindrical battery cells is to use a serpentine cooling system. This system typically integrates a cold plate at the bottom or side of the battery pack, with an interconnected serpentine flow channel within the cold plate. To increase the heat exchange area and coverage, the cold plate may contain multiple parallel flow channel branches, but these parallel branches share the same inlet and outlet, forming a single-inlet, single-outlet integrated loop.

[0004] This design results in relatively long cooling channels, and the temperature of the cooling medium gradually increases as it flows through the entire path due to continuous heat absorption. This inevitably leads to differences in cooling intensity across different areas of the cold plate, resulting in significant temperature differences between the battery cells in contact with it. Excessive temperature differences directly accelerate the inconsistent aging rates of the individual battery cells, shortening the overall cycle life of the battery pack. Utility Model Content

[0005] This application provides a cooling device and a battery pack to solve the problem that the cooling intensity varies in different areas of the cold plate, resulting in a significant temperature difference between the battery cells in contact with the cold plate.

[0006] In a first aspect, this application provides a cooling device having intersecting first, second, and third directions, comprising:

[0007] At least two cold plates are provided, and the at least two cold plates are distributed sequentially along the first direction. The interior of each cold plate is provided with a first channel and a second channel extending along the second direction. The first channel and the second channel are distributed along the third direction. Both the first channel and the second channel are provided with an inlet end and an outlet end. The direction from the inlet end to the outlet end of the first channel is opposite to the direction from the inlet end to the outlet end of the second channel.

[0008] The support member is provided in at least one pair, and the at least one pair of the support members are respectively supported between any two adjacent cold plates. The support member includes a first connecting channel and a second connecting channel.

[0009] The liquid inlet end of the first channel of two adjacent cold plates is connected to the first connecting channel of one of the pair of supports, and the liquid outlet end of the first channel of two adjacent cold plates is connected to the first connecting channel of the other support.

[0010] The liquid inlet end of the second channel of two adjacent cold plates is connected to the second connecting channel of one of the pair of supports, and the liquid outlet end of the second channel of two adjacent cold plates is connected to the second connecting channel of the other support.

[0011] Beneficial effects: By dividing the interior of the cold plate into independent first and second channels distributed along a third direction, and ensuring that their flow directions are opposite, and coordinating with the first and second connecting channels in the support component to connect adjacent cold plates in series, reverse parallel flow of coolant is achieved among multiple cold plates. This overcomes the limitations of single-inlet, single-outlet cooling channels in related technologies, enabling efficient heat exchange simultaneously between the upper and lower layers of the cold plate. Specifically, as the low-temperature coolant flows in from the upper layer to absorb heat, the lower layer simultaneously discharges the heated coolant. This bidirectional flow pattern significantly reduces the temperature difference between different areas of the cold plate, thereby homogenizing the cooling intensity between battery cells, suppressing differences in battery aging rates caused by localized overheating, and extending the overall lifespan of the battery pack. Simultaneously, the support component also provides stable support for multiple cold plates.

[0012] In one alternative embodiment, the support member includes:

[0013] The main body is provided with a first inner cavity and a second inner cavity. The first inner cavity is respectively connected to the first channel of two adjacent cold plates, and the second inner cavity is respectively connected to the second channel of two adjacent cold plates.

[0014] A pair of first connecting pipes are both connected to the first inner cavity. The pair of first connecting pipes are respectively connected to the first channels of two adjacent cold plates. The first inner cavity and the pair of first connecting pipes form the first connecting channel.

[0015] A pair of second connecting pipes are connected to the second inner cavity. The pair of second connecting pipes are respectively connected to the second channels of two adjacent cold plates. The second inner cavity and the pair of second connecting pipes form the first connecting channel.

[0016] Beneficial effects: The first and second inner cavities of the main body can serve as unidirectional flow channels for adjacent cold plates, providing integrated connection nodes and simplifying the flow channel layout. Centralized liquid distribution through the first or second inner cavity avoids multiple intersecting pipes, improves sealing reliability, reduces flow resistance, ensures a stable and controllable series path of coolant between cold plates, and further enhances the temperature equalization effect of reverse flow. The paired first and second connecting pipes connect the main body and the end of the cold plate respectively, forming a complete connection channel together with the inner cavities.

[0017] In one optional embodiment, the angle between the axis of the first connecting pipe and the side wall of the main body is α, where 20°≤α≤30°; the angle between the axis of the second connecting pipe and the side wall of the main body is β, where 20°≤β≤30°.

[0018] Beneficial effects: The first and second connecting pipes are both set at an angle to the main body, which allows for higher structural strength of the first and second connecting pipes and the main body within this range, enhancing the overall stability of the support. It also ensures that the first and second connecting pipes do not occupy excessive space in the third direction. Furthermore, when the angles between the first and second connecting pipes and the main body are within this range, it facilitates the flow of the cooling medium.

[0019] In one optional embodiment, the length of the main body portion along the first direction is L1, wherein 10mm≤L1≤50mm.

[0020] Beneficial effects: A cylindrical battery cell is disposed between two adjacent cold plates arranged along the first direction, and both adjacent cold plates are in contact with the cylindrical battery cell. Therefore, the distance between two adjacent cold plates is the diameter of the cylindrical battery cell, which is generally between 40mm and 50mm. Thus, the length of the main body along the first direction can be less than the distance between two adjacent cold plates, or it can be equal to the distance between two adjacent cold plates, thereby further enhancing the support effect on the cold plates.

[0021] In one optional embodiment, the first inner cavity and the second inner cavity are sequentially distributed along the third direction, the first connecting pipe and the second connecting pipe are respectively disposed on two opposite sides of the main body along the third direction, a pair of first connecting pipes are disposed on two opposite sides of the main body along the first direction, and a pair of second connecting pipes are disposed on two opposite sides of the main body along the first direction.

[0022] Beneficial effects: The first inner cavity and the second inner cavity are distributed along the third direction, and the first connecting pipe and the second connecting pipe extend along the first direction. This can make full use of the three-dimensional space of the cold plate gap, achieve a compact arrangement, reduce the volume of the support component, avoid interference with the battery cell, and at the same time make the liquid path direction naturally fit with the cold plate channel direction, reducing energy loss caused by bending.

[0023] In one alternative embodiment, the cold plate is provided with:

[0024] A pair of end caps are respectively disposed at two opposite ends of the cold plate along the second direction. The end caps are provided with a first chamber and a second chamber. The first chamber is connected to the first channel, and the second chamber is connected to the second channel.

[0025] The first connecting pipe is connected to the first chamber, and the second connecting pipe is connected to the second chamber.

[0026] Beneficial effects: The first and second chambers inside the end cap serve as flow collection areas connecting the internal channels of the cold plate with the outside, enabling the convergence and divergence of multiple branch channels.

[0027] In one optional implementation, multiple first channels and multiple second channels are sequentially distributed along the third direction, and multiple first channels are all connected to the first chamber, and multiple second channels are all connected to the second chamber.

[0028] Beneficial effects: Multiple parallel first and second channels are arranged within a single cold plate and connected in parallel through the chamber of the end cap, maximizing the heat exchange area within a limited space. The multi-channel structure reduces the flow load of a single path, and combined with the reverse flow design, it makes the temperature distribution on the surface of the cold plate more uniform, which is especially suitable for efficient thermal management of large-size cylindrical batteries.

[0029] In one optional embodiment, the width of the first channel and the width of the second channel along the third direction are equal, and the width of the first channel along the third direction is L2, wherein 3mm ≤ L2 ≤ 7mm. The width of the cold plate along the third direction is L3, wherein 70mm ≤ L3 ≤ 180mm.

[0030] Beneficial effects: The specific number of the first and second channels on the cold plate needs to be determined based on the shoulder height of the cylindrical battery cell, and the width of the cold plate along the third direction is also determined based on the shoulder height of the cylindrical battery cell. Therefore, by limiting the width of the first and second channels along the third direction, as well as the width of the cold plate along the third direction, the flow of the cooling medium in the first and second channels can be guaranteed, avoiding the situation where the width of the first and second channels along the third direction is too small due to an excessive number of channels, thus avoiding affecting the flow of the cooling medium.

[0031] In one optional embodiment, the end cap is provided with:

[0032] A partition is disposed inside the end cap, and the partition divides the inner cavity of the end cap into a first chamber and a second chamber.

[0033] Beneficial effects: The partition separates the first inner cavity and the second inner cavity inside the end cap, preventing cross-flow between the first channel and the second channel and ensuring the independence of reverse flow.

[0034] In one alternative implementation, it further includes:

[0035] The liquid supply assembly includes two output terminals, which are respectively connected to a pair of end caps on the first cold plate along the first direction;

[0036] The liquid outlet assembly includes two input terminals, which are respectively connected to a pair of end caps on the first cold plate along the first direction.

[0037] Beneficial effects: The dual output interfaces and dual input interfaces of the liquid supply and discharge components directly connect to the bidirectional channel of the cold plate, avoiding complex external diversion structures.

[0038] Secondly, this application also provides a battery pack including the cooling device.

[0039] Beneficial effects: Batteries with cooling devices can control the temperature difference between individual cells through reverse flow between the cold plate layers, thus delaying aging caused by battery inconsistency. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the structure of a cooling device according to an embodiment of this application;

[0042] Figure 2 This is a schematic diagram showing the positional relationship between the support member and the cold plate in an embodiment of this application;

[0043] Figure 3 This is a schematic diagram of the support structure in the embodiments of this application;

[0044] Figure 4This is a side view of the support member in an embodiment of this application;

[0045] Figure 5 for Figure 4 Cross-sectional view of BB in the middle;

[0046] Figure 6 This is a schematic diagram of the cold plate structure in an embodiment of this application;

[0047] Figure 7 for Figure 6 A magnified view of part A in the image;

[0048] Figure 8 This is a schematic diagram of the end cap structure in an embodiment of this application.

[0049] Explanation of reference numerals in the attached figures:

[0050] 1. Cold plate; 101. First channel; 102. Second channel; 2. Support component; 201. Main body; 2011. First inner cavity; 2012. Second inner cavity; 202. First connecting pipe; 203. Second connecting pipe; 3. End cap; 301. First chamber; 302. Second chamber; 303. Partition; 4. Liquid supply assembly; 5. Liquid outlet assembly; X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0052] The following is combined with Figures 1 to 8 This describes an embodiment of the present application.

[0053] According to an embodiment of this application, a cooling device is provided, having intersecting first direction X, second direction Y, and third direction Z, including cold plates 1 and support members 2. At least two cold plates 1 are provided, arranged sequentially along the first direction X. The interior of each cold plate 1 has a first channel 101 and a second channel 102 extending along the second direction Y, distributed along the third direction Z. Both the first channel 101 and the second channel 102 have an inlet and an outlet end, with the direction from the inlet end to the outlet end of the first channel 101 opposite to the direction from the inlet end to the outlet end of the second channel 102. At least one pair of support members 2 are provided, each pair supporting any two adjacent cold plates 1. Each support member 2 includes a first connecting channel and a second connecting channel.

[0054] Specifically, the liquid inlet ends of the first channels 101 of two adjacent cold plates 1 are respectively connected to the first connecting channel of one of the pair of support members 2, and the liquid outlet ends of the first channels 101 of two adjacent cold plates 1 are respectively connected to the first connecting channel of the other support member 2. The liquid inlet ends of the second channels 102 of two adjacent cold plates 1 are respectively connected to the second connecting channel of one of the pair of support members 2, and the liquid outlet ends of the second channels 102 of two adjacent cold plates 1 are respectively connected to the second connecting channel of the other support member 2.

[0055] It should be noted that, as Figure 1 As shown, the first direction X is the thickness direction of the cold plate 1, the second direction Y is the length direction of the cold plate 1, and the third direction Z is the width direction of the cold plate 1. Multiple cold plates 1 are distributed sequentially along the first direction X, meaning they are spaced apart along their thickness direction, and the distance between any two adjacent cold plates 1 is equal. The first channel 101 and the second channel 102 are distributed along the third direction Z. Specifically, the first channel 101 and the second channel 102 are respectively located at both ends of the width direction of the cold plate 1. This arrangement allows the first and second connecting channels to be synchronously integrated into a single support member 2, making the first channels 101 and the second channels 102 of the multiple cold plates 1 a straight-through structure along the first direction X. This ensures that the support member 2 is located within the coverage area of ​​two adjacent cold plates 1 along the first direction X, achieving both connectivity and support. No additional connecting members are needed; the additional connecting members extend from the coverage area of ​​two adjacent cold plates 1 along the first direction X, connecting the first channel 101 or the second channel 102 of the two adjacent cold plates 1, saving space and coupling the support and connectivity effects of the support member 2. Meanwhile, the support component 2 can also provide stable support for multiple cold plates 1.

[0056] In addition, such as Figure 6 As shown, the cold plate 1 can be specifically configured as a serpentine cold plate 1, including a recessed area along the first direction X and a protruding area along the first direction X. The recessed areas and protruding areas of two adjacent cold plates 1 are correspondingly arranged, which can be adapted to the outer sidewall of the cylindrical cell to increase the coverage area and thus enhance the cooling effect.

[0057] In this embodiment, by dividing the interior of the cold plate 1 into independent first channels 101 and second channels 102 distributed along the third direction Z, and ensuring that the two channels flow in opposite directions, and cooperating with the first and second connecting channels in the support member 2 to connect adjacent cold plates 1 in series, the reverse parallel flow of coolant between multiple cold plates 1 is achieved. This solves the limitations of the single-inlet, single-outlet cooling channel in related technologies, enabling efficient heat exchange between the upper and lower layers of the cold plate 1 simultaneously. That is, when the low-temperature coolant flows in from the upper layer to absorb heat, the lower layer simultaneously discharges the heated coolant. This bidirectional flow mode can significantly reduce the temperature difference between different areas of the cold plate 1, thereby homogenizing the cooling intensity between battery cells, suppressing the difference in battery aging rate caused by local overheating, and extending the overall life of the battery pack.

[0058] In one embodiment, such as Figures 3 to 5 As shown, the support member 2 includes a main body 201 and is provided with a first inner cavity 2011 and a second inner cavity 2012. The first inner cavity 2011 is connected to the liquid outlet or liquid inlet of the first channel 101 of two adjacent cold plates 1, and the second inner cavity 2012 is connected to the liquid outlet or liquid inlet of the second channel 102 of two adjacent cold plates 1.

[0059] Optionally, the first inner cavity 2011 and the second inner cavity 2012 are internal structures of the main body 201 itself, and are formed by providing a plate structure in the inner cavity of the main body 201.

[0060] Optionally, the main body 201 may include a first outer shell and a second outer shell, with a first inner cavity 2011 and a second inner cavity 2012 respectively provided inside the first outer shell and the second outer shell. The main body 201 is formed by connecting the outer walls of the first outer shell and the second outer shell.

[0061] Optionally, the main body 201 can be configured as an integral casting structure or an integral injection molding structure, with the first inner cavity 2011 and the second inner cavity 2012 integrally formed with the main body 201.

[0062] In this embodiment, the first inner cavity 2011 and the second inner cavity 2012 of the main body 201 can serve as unidirectional flow channels for adjacent cold plates 1, providing integrated connection nodes and simplifying the flow channel layout. Centralized liquid distribution through the first inner cavity 2011 or the second inner cavity 2012 avoids multiple intersecting pipes, improves sealing reliability, reduces flow resistance, ensures a stable and controllable series path of the coolant between the cold plates 1, and further enhances the temperature equalization effect of reverse flow.

[0063] In one embodiment, such as Figures 3 to 5As shown, the support member 2 includes a pair of first connecting pipes 202 and a pair of second connecting pipes 203. Both first connecting pipes 202 are connected to the first inner cavity 2011, and are respectively connected to the liquid outlet or liquid inlet of the first channel 101 of two adjacent cold plates 1. The first inner cavity 2011 and the pair of first connecting pipes 202 form a first connecting channel. Both second connecting pipes 203 are connected to the second inner cavity 2012, and are respectively connected to the liquid outlet or liquid inlet of the second channel 102 of two adjacent cold plates 1. The second inner cavity 2012 and the pair of second connecting pipes 203 form a first connecting channel.

[0064] It should be noted that the connection ends of the first connecting pipe 202 and the second connecting pipe 203 to the end cap 3 can both be set in a trumpet shape and are larger than the connecting pipe or connecting through hole on the end cap 3, so as to facilitate the connection between the connecting pipe and the end cap 3.

[0065] Optionally, the main body 201, the first connecting pipe 202, and the second connecting pipe 203 can be configured as an integral casting structure or an integral injection molding structure, or they can be connected by fasteners, or they can be configured as a welded structure.

[0066] In this embodiment, the first connecting pipe 202 and the second connecting pipe 203, which are arranged in pairs, are respectively connected to the main body 201 and the end of the cold plate 1, forming a complete connecting channel together with the inner cavity.

[0067] In one embodiment, the angle between the axis of the first connecting pipe 202 and the side wall of the main body 201 is α, where 20°≤α≤30°; the angle between the axis of the second connecting pipe 203 and the side wall of the main body 201 is β, where 20°≤β≤30°.

[0068] In this embodiment, the first connecting pipe 202 and the second connecting pipe 203 are both set at an angle to the main body 201. This allows the first connecting pipe 202, the second connecting pipe 203, and the main body 201 to have higher structural strength within this range, enhancing the overall stability of the support. It also ensures that the first connecting pipe 202 and the second connecting pipe 203 do not occupy excessive space in the third direction Z. Furthermore, when the angle between the first connecting pipe 202 and the second connecting pipe 203 and the main body 201 is within this range, it facilitates the flow of the cooling medium.

[0069] In one embodiment, the length of the main body 201 along the first direction X is L1, wherein 10mm≤L1≤50mm.

[0070] In this embodiment, a cylindrical battery cell is disposed between two adjacent cold plates 1 arranged along the first direction X, and both adjacent cold plates 1 are in contact with the cylindrical battery cell. Therefore, the distance between two adjacent cold plates 1 is the diameter of the cylindrical battery cell. The diameter of the cylindrical battery cell is generally between 40mm and 50mm. Therefore, the length of the main body 201 along the first direction X can be less than the distance between two adjacent cold plates 1, or it can be equal to the distance between two adjacent cold plates 1, thereby further enhancing the support effect on the cold plates 1.

[0071] In one embodiment, such as Figure 5 As shown, the first inner cavity 2011 and the second inner cavity 2012 are distributed sequentially along the third direction Z. The first connecting pipe 202 and the second connecting pipe 203 are respectively arranged on two opposite sides of the main body 201 along the third direction Z. A pair of first connecting pipes 202 are arranged on two opposite sides of the main body 201 along the first direction X. A pair of second connecting pipes 203 are arranged on two opposite sides of the main body 201 along the first direction X.

[0072] It should be noted that the first inner cavity 2011 and the second inner cavity 2012 are distributed sequentially along the third direction Z. With the arrangement of the first channel 101 and the second channel 102 distributed along the third direction Z, the two coolant flow paths are respectively placed at both ends of the width direction of the cold plate 1, avoiding mutual interference and mutual obstruction between the two, and realizing the coupling between the support member 2 and the cooling path.

[0073] In this embodiment, the first inner cavity 2011 and the second inner cavity 2012 are distributed along the third direction Z, and the first connecting pipe 202 and the second connecting pipe 203 extend along the first direction X. This can make full use of the three-dimensional space of the gap between the cold plates 1 to achieve a compact arrangement, reduce the volume of the support member 2, avoid interference with the battery cells, and at the same time make the liquid path direction naturally fit with the channel direction of the cold plate 1, reducing the energy loss caused by bending.

[0074] In one embodiment, a pair of end caps 3 are provided on the cold plate 1, respectively located at two opposite ends of the cold plate 1 along the second direction Y. A first chamber 301 and a second chamber 302 are provided within the end caps 3. The first chamber 301 communicates with the first channel 101, and the second chamber 302 communicates with the second channel 102. A first connecting pipe 202 communicates with the first chamber 301, and a second connecting pipe 203 communicates with the second chamber 302.

[0075] It should be noted that the first chamber 301 and the second chamber 302 serve to converge multiple first channels 101 and multiple second channels 102, and are used to connect with the support member 2, thus avoiding damage to the structure of the cold plate 1 and ensuring the structural strength and sealing of the cold plate 1. Specifically, the connection nodes with the liquid supply component 4, the liquid outlet component 5, and the support member 2 are all located on the end cap 3.

[0076] In this embodiment, the first chamber 301 and the second chamber 302 provided inside the end cover 3 serve as a flow collection area connecting the internal channel of the cold plate 1 with the outside, which can realize the convergence and diversion of multiple branch channels.

[0077] In one embodiment, multiple first channels 101 and multiple second channels 102 are arranged sequentially along the third direction Z, and multiple first channels 101 are connected to the first chamber 301, and multiple second channels 102 are connected to the second chamber 302.

[0078] Understandable, such as Figure 7 As shown, multiple first channels 101 and multiple second channels 102 are arranged sequentially along the third direction Z. That is, multiple first channels 101 are arranged at one end of the cold plate 1 along its width direction, and multiple second channels 102 are arranged at the other end of the cold plate 1 along its width direction.

[0079] In this embodiment, a single cold plate 1 is provided with multiple parallel first channels 101 and second channels 102, which are connected in parallel through the chamber of the end cap 3, maximizing the heat exchange area within a limited space. The multi-channel structure reduces the flow load of a single path, and combined with the reverse flow design, makes the surface temperature distribution of the cold plate 1 more uniform, which is especially suitable for efficient thermal management of large-size cylindrical batteries.

[0080] In one embodiment, such as Figure 8 As shown, a partition 303 is provided inside the end cap 3, which divides the inner cavity of the end cap 3 into a first chamber 301 and a second chamber 302.

[0081] It should be noted that the partition 303 and the end cap 3 can be configured as an integral structure or as separate structures that are connected later.

[0082] In one embodiment, the widths of the first channel 101 and the second channel 102 along the third direction Z are equal, and the width of the first channel 101 along the third direction Z is L2, wherein 3mm ≤ L2 ≤ 7mm. The width of the cold plate 1 along the third direction Z is L3, wherein 70mm ≤ L3 ≤ 180mm.

[0083] In this embodiment, the specific number of the first channel 101 and the second channel 102 on the cold plate 1 needs to be determined according to the shoulder height of the cylindrical battery cell, and the width of the cold plate 1 along the third direction Z is also determined according to the shoulder height of the cylindrical battery cell. Therefore, by limiting the width of the first channel 101 and the second channel 102 along the third direction Z, and limiting the width of the cold plate 1 along the third direction Z, the flow of the cooling medium in the first channel 101 and the second channel 102 can be guaranteed, and the excessive number of the first channel 101 and the second channel 102 can be avoided, which would result in the width of the first channel 101 and the second channel 102 being too small along the third direction Z, thus avoiding affecting the flow of the cooling medium.

[0084] In this embodiment, the partition 303 separates the first inner cavity 2011 and the second inner cavity 2012 within the end cap 3, preventing crossflow between the first channel 101 and the second channel 102 and ensuring the independence of reverse flow.

[0085] In one embodiment, the system further includes a liquid supply assembly 4 and a liquid outlet assembly 5. The liquid supply assembly 4 includes two output terminals, which are respectively connected to a pair of end caps 3 on the first cold plate 1 along the first direction X. The liquid outlet assembly 5 includes two input terminals, which are respectively connected to a pair of end caps 3 on the first cold plate 1 along the first direction X.

[0086] It should be noted that both the liquid supply component 4 and the liquid outlet component 5 are configured as valve bodies and are connected to the external heat exchange system.

[0087] In this embodiment, the dual output interfaces and dual input interfaces of the liquid supply component 4 and the liquid outlet component 5 are directly connected to the bidirectional channel of the cold plate 1, avoiding complex external diversion structures.

[0088] In one embodiment, the first connecting pipe 202, the second connecting pipe 203, and the main body 201 can be constructed as an integral structure, eliminating the risk of leakage at the pipe joints and stabilizing the multiple cold plates 1. The integral molding process improves the pressure resistance and shock resistance of the support component 2, making it particularly suitable for the vibration conditions of electric vehicles and ensuring the sealing reliability of the cooling system during long-term operation.

[0089] According to an embodiment of this application, another aspect provides a battery pack including a cooling device.

[0090] In this embodiment, the battery using the cooling device can control the temperature difference between individual battery cells through reverse flow between the cold plate 1 layers, thus delaying aging caused by battery inconsistency.

[0091] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A cooling device having a first direction (X), a second direction (Y), and a third direction (Z) that intersect each other in pairs, characterized in that, include: At least two cold plates (1) are provided, and the at least two cold plates (1) are distributed sequentially along the first direction (X). The interior of the cold plate (1) is provided with a first channel (101) and a second channel (102) extending along the second direction (Y). The first channel (101) and the second channel (102) are distributed along the third direction (Z). The first channel (101) and the second channel (102) are each provided with an inlet end and an outlet end. The direction from the inlet end to the outlet end of the first channel (101) is opposite to the direction from the inlet end to the outlet end of the second channel (102). Support member (2), provided in at least one pair, the at least one pair of support members (2) are respectively supported between any two adjacent cold plates (1), the support member (2) includes a first connecting channel and a second connecting channel; The liquid inlet end of the first channel (101) of two adjacent cold plates (1) is connected to the first connecting channel of one of the support members (2) of a pair of support members (2), and the liquid outlet end of the first channel (101) of two adjacent cold plates (1) is connected to the first connecting channel of the other support member (2). The liquid inlet end of the second channel (102) of two adjacent cold plates (1) is connected to the second connecting channel of one of the support members (2) of a pair of support members (2), and the liquid outlet end of the second channel (102) of two adjacent cold plates (1) is connected to the second connecting channel of the other support member (2).

2. Cooling device according to claim 1, characterized in that The support member (2) includes: The main body (201) is provided with a first inner cavity (2011) and a second inner cavity (2012). The first inner cavity (2011) is connected to the first channel (101) of two adjacent cold plates (1) respectively, and the second inner cavity (2012) is connected to the second channel (102) of two adjacent cold plates (1) respectively. A pair of first connecting pipes (202) are both connected to the first inner cavity (2011). The pair of first connecting pipes (202) are respectively connected to the first channels (101) of two adjacent cold plates (1). The first inner cavity (2011) and the pair of first connecting pipes (202) form the first connecting channel. A pair of second connecting pipes (203) are connected to the second inner cavity (2012). The pair of second connecting pipes (203) are respectively connected to the second channels (102) of two adjacent cold plates (1). The second inner cavity (2012) and the pair of second connecting pipes (203) form the first connecting channel.

3. Cooling device according to claim 2, characterized in that The angle between the axis of the first connecting pipe (202) and the side wall of the main body (201) is α, where 20°≤α≤30°; the angle between the axis of the second connecting pipe (203) and the side wall of the main body (201) is β, where 20°≤β≤30°; The length of the main body (201) along the first direction (X) is L1, wherein 10mm≤L1≤50mm.

4. Cooling device according to claim 2, characterized in that The first inner cavity (2011) and the second inner cavity (2012) are sequentially distributed along the third direction (Z). The first connecting pipe (202) and the second connecting pipe (203) are respectively disposed on two opposite sides of the main body (201) along the third direction (Z). A pair of first connecting pipes (202) are disposed on two opposite sides of the main body (201) along the first direction (X). A pair of second connecting pipes (203) are disposed on two opposite sides of the main body (201) along the first direction (X).

5. Cooling device according to claim 4, characterized in that The cold plate (1) is provided with: A pair of end caps (3) are respectively disposed at two opposite ends of the cold plate (1) along the second direction (Y). The end caps (3) are provided with a first chamber (301) and a second chamber (302). The first chamber (301) is connected to the first channel (101), and the second chamber (302) is connected to the second channel (102). The first connecting pipe (202) is connected to the first chamber (301), and the second connecting pipe (203) is connected to the second chamber (302).

6. Cooling device according to claim 5, characterized in that The first channel (101) and the second channel (102) are arranged in multiple ways along the third direction (Z), and the multiple first channels (101) are all connected to the first chamber (301), and the multiple second channels (102) are all connected to the second chamber (302).

7. Cooling device according to claim 6, characterized in that The widths of the first channel (101) and the second channel (102) along the third direction (Z) are equal, and the width of the first channel (101) along the third direction (Z) is L2, wherein 3mm≤L2≤7mm; The width of the cold plate (1) along the third direction (Z) is L3, wherein 70mm≤L3≤180mm.

8. The cooling device of claim 5, wherein, The end cap (3) is provided with: A partition (303) is disposed inside the end cap (3), the partition (303) dividing the inner cavity of the end cap (3) into the first chamber (301) and the second chamber (302).

9. The cooling device of claim 6, wherein, Also includes: The liquid supply assembly (4) includes two output ends, which are respectively connected to a pair of end caps (3) on the first cold plate (1) along the first direction (X); The liquid outlet assembly (5) includes two input terminals, which are respectively connected to a pair of end caps (3) on the first cold plate (1) along the first direction (X).

10. A battery pack, characterized by, include: The cooling device according to any one of claims 1 to 9.

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