Direct cooling plates, heat exchangers, power battery packs and vehicles

Abstract

Direct cooling plate, heat exchanger, power battery pack and vehicle. The direct cooling plate comprises a plurality of heat exchange channels disposed within the direct cooling plate. Each heat exchange channel comprises an inlet for coolant to enter therein and an outlet for coolant to exit therefrom, at least one heat exchange channel being disposed circumferentially around the other heat exchange channels, each heat exchange channel forming a heat exchange unit in the direct cooling plate, the heat exchange unit being used to perform heat exchange in different temperature regions of the battery. The direct cooling plate can control the temperature of the coolant at the inlet of each heat exchange channel to target different temperature regions of the battery such that the overall temperature difference of the battery is improved, thereby extending the service life of the battery.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This disclosure claims priority to Chinese Patent Application No. 202221703985.0, entitled "DIRECT COOLING PLATE OF HEAT EXCHANGER, HEAT EXCHANGER AND POWER BATTERY PACK," filed on June 30, 2022, the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to the field of heat exchange for power batteries, and more particularly to direct cooling plates, heat exchangers, power battery packs, and vehicles. [Background technology]

[0003] In related technology, conventional coolers for power battery packs, made by stamping and brazing, use the evaporative and heat-absorbing properties of the refrigerant to exchange heat with the power battery, thereby achieving the goal of cooling the power battery. The cooler's flow path adopts a structural design with one inlet and one outlet. Adjusting the flow rate of the cooler affects the heat transfer efficiency of the entire contact area between the cooler and the battery. Currently, power batteries have high energy density and large capacity, and the heat generated in different areas of the battery cell also varies. Therefore, conventional power battery coolers can no longer meet the requirements when using power batteries, thereby failing to contribute to temperature difference management of the power battery and affecting the service life of the power battery. Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure provides a direct cooling plate, a heat exchanger, a power battery pack, and a vehicle. The direct cooling plate can meet the cooling and / or heating requirements of different areas of the battery by controlling the temperature of each heat exchange channel, allowing each heat exchange channel to have different cooling and / or heating capabilities, improving the overall temperature difference of the battery and extending the service life of the battery. [Means for solving the problem]

[0005] To achieve the above object, a first aspect of the present disclosure provides a direct cooling plate including a plurality of heat exchange channels disposed therein, each heat exchange channel including an inlet for a refrigerant to enter therein and an outlet for the refrigerant to exit therefrom, and at least one heat exchange channel is disposed circumferentially around the other heat exchange channels.

[0006] Each heat exchange channel forms a heat exchange unit directly on the cooling plate, and the heat exchange unit is configured to exchange heat in different temperature regions of the battery.

[0007] In one embodiment, the inlet and outlet of the heat exchange channels are directly located on the same side of the cooling plate.

[0008] In one embodiment, the number of heat exchange channels is two, channel 1 and channel 2, with channel 1 being positioned around the outside of channel 2.

[0009] In one embodiment, channel 2 is generally concave, and channel 1 includes two first cooling sections and a second cooling section connected between the two first cooling sections, the second cooling section extending into the recess formed by channel 2, and the two first cooling sections being circumferentially disposed around the outside of channel 2.

[0010] In one embodiment, channel 1 includes a first branch channel, the first branch channel, the first cooling channel, and the first confluence channel are sequentially connected to each other, and the first cooling channel and the first confluence channel include at least two sub-channels, and the number of sub-channels in the first cooling channel is greater than the number of sub-channels in the first branch channel and the first confluence channel.

[0011] and / or the second flow path, which are sequentially connected to each other, includes a second branch channel, a second cooling channel, and a second merging channel, each of which includes at least two sub-channels, and the number of sub-channels of the second cooling channel is greater than the number of sub-channels of the second branch channel and the second merging channel.

[0012] In one embodiment, the number of sub-channels in the first branch channel and the first merge channel are the same.

[0013] The number of sub-channels in the second branch channel and the second merge channel is the same.

[0014] In one embodiment, the direct cooling plate includes interconnected plate 1 and plate 2, where plate 1 is provided with grooves 1 and 2 recessed away from plate 2, and groove 1 is disposed around the outside of groove 2. Plate 2 and groove 1 surround channel 1, while plate 2 and groove 2 surround channel 2.

[0015] In one embodiment, groove 1 and groove 2 are formed by stamping.

[0016] And / or, the first and second plates are connected by brazing.

[0017] In a second aspect of the present disclosure, a heat exchanger is provided that includes the aforementioned direct cooling plate.

[0018] In a third aspect of the present disclosure, a power battery pack is provided that includes a power battery, the power battery pack further including a heat exchanger as described above, the heat exchanger attached to the power battery for cooling and / or heating the power battery.

[0019] A fourth aspect of the present disclosure also provides a vehicle including the power battery pack described in the third aspect of the present disclosure.

[0020] According to the above technical solution, i.e., the disclosed direct cooling plate, the direct cooling plate includes a plurality of heat exchange channels, each including an inlet and an outlet. Each heat exchange channel forms a heat exchange unit corresponding to a different temperature zone of a battery (such as a power battery). According to the cooling and / or heating requirements of the different temperature zones of the battery, the temperature inside the heat exchange channel can be adjusted by controlling the flow rate and pressure of the coolant at the inlet of each heat exchange channel. As a result, the cooling and / or heating capacity of each heat exchange unit is adapted to the temperature of the corresponding battery zone, improving the overall temperature difference of the battery, achieving more accurate temperature difference management of the battery, and extending the service life of the battery.

[0021] Other features and advantages of the present disclosure are described in detail in the section on specific implementations that follows.

[0022] The accompanying drawings are included to provide a further understanding of the present disclosure and form a part of this specification, and together with the specific embodiments below are used to explain the disclosure and are not intended to be limitations thereon. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a schematic diagram of a stamping and brazing cooler structure for a power battery pack in the related art. [Figure 2]FIG. 2 is a schematic diagram of channel 1 and channel 2 of a direct cooling plate provided in some embodiments of the present disclosure. [Figure 3] 1 is a schematic diagram of a channel 1 of a direct cooling plate provided in some embodiments of the present disclosure. [Figure 4] FIG. 2 is a schematic diagram of a channel 2 of a direct cooling plate provided in some embodiments of the present disclosure. [Figure 5] 1 is a front view of plate 1 of a direct cooling plate provided in some embodiments of the present disclosure. FIG. [Figure 6] FIG. 2 is a front view of plate 2 of a direct cooling plate provided in some embodiments of the present disclosure. [Figure 7] FIG. 1 is an exploded view of a power battery pack provided by some embodiments of the present disclosure. [Figure 8] 1 is a front view of a power battery provided by some embodiments of the present disclosure, showing two end positions of the power battery and an intermediate position of the battery cells. FIG. [Figure 9] 1 is a structural block diagram of a vehicle provided by some embodiments of the present disclosure. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0024] Specific implementations of the present disclosure are described in detail below in conjunction with the accompanying drawings. It should be understood that particular embodiments described herein are intended to be illustrative and explanatory only and are not intended to limit the present disclosure.

[0025] In this disclosure, unless otherwise stated, directional terms such as "top, bottom, left, right" generally refer to the corresponding top, bottom, left, and right in the accompanying drawings, and "inside and outside" refer to the "inside and outside" relative to the contours of the corresponding components themselves. In addition, the terms "first," "second," "third," "fourth," etc. used in this disclosure are intended to distinguish one element from another and do not have any order or importance. In addition, in the following description, when referring to the figures, the same reference numerals in different figures represent the same or similar elements unless otherwise stated. The above definitions are only for the purpose of describing and illustrating the present disclosure and should not be construed as limitations on the present disclosure.

[0026] In the related art, a cooler for a power battery pack made by stamping and brazing is shown in Figure 1, which consists of a stamping plate with an internal flow path, a temperature equalizing plate, and a welded joint. The refrigerant enters the flow path through the inlet of the joint and flows in parallel through the flow paths arranged in parallel by dividing the flow. The refrigerant circulates in the flow path, eventually converges, and flows out from the outlet of the joint, completing the circulation of the refrigerant in the flow path. This type of cooler exchanges heat with the power battery by utilizing the evaporative and heat absorption properties of the refrigerant, thereby achieving the purpose of cooling the power battery.

[0027] The cooler of this power battery pack, made by stamping and brazing, has the following drawbacks: all flow paths are affected by the refrigerant flow rate at the inlet of the joint, and adjusting the flow rate at the inlet of the cooler will affect the heat transfer efficiency of the entire contact area between the cooler and the battery. The cooler channels adopt a one-piece design, which increases the pressure drop across the cooler, resulting in different evaporation temperatures of the refrigerant at different pressures, and ultimately leading to an increase in the temperature gradient inside the cooler along the positive path. The long length of the flow paths leads to poor flow separation effects in the parallel branches and different heat transfer areas of the flow paths. As a result, the evaporation degree of the refrigerant in different branches varies, ultimately causing the refrigerant in some branches to evaporate earlier than usual, resulting in local overheating of the parallel flow paths.

[0028] 2 to 8, to achieve the above object, a first aspect of the present disclosure provides a direct cooling plate 10 including a plurality of heat exchange channels 100 arranged therein. Each heat exchange channel 100 includes an inlet 101 for a refrigerant to enter therein and an outlet 102 for the refrigerant to exit therefrom. At least one heat exchange channel 100 is arranged circumferentially around the other heat exchange channels 100. Each heat exchange channel 100 forms a heat exchange unit in the direct cooling plate 10, and the heat exchange unit is used to exchange heat among different temperature regions of a battery (such as a power battery 300).

[0029] According to the above technical solution, i.e., the disclosed direct cooling plate 10, the direct cooling plate 10 includes a plurality of heat exchange channels 100, each including an inlet 101 and an outlet 102. Each heat exchange channel 100 forms a heat exchange unit corresponding to a different temperature region of a battery (such as a power battery 300). According to the cooling and / or heating requirements of the different temperature regions of the battery, the temperature inside the heat exchange channel 100 can be adjusted by controlling the flow rate and pressure of the refrigerant at the inlet 101 of each heat exchange channel 100, so that the cooling and / or heating capacity of each heat exchange unit can be adapted to the different temperature regions of the corresponding battery, improving the overall temperature difference of the battery and making it more precisely managed, and extending the service life of the battery. At the same time, at least one heat exchange channel 100 is circumferentially surrounded by other heat exchange channels 100, thereby allowing the battery to be heated or cooled preferentially in the circumferential direction, which is beneficial to improving the temperature difference of the battery in different environments and to some extent extending the service life of the battery.

[0030] It is worth noting that a coolant that can be used for cooling can be introduced directly into the cooling plate 10, or a gas coolant that can be used for heating can be introduced.

[0031] It can be seen that the structural form of the direct cooling plate 10 enables the introduction of different refrigerants (gas or liquid refrigerants) into different temperature areas of the battery according to the required cooling and / or heating amount of heat, thereby enabling better and more accurate control of the overall temperature difference of the battery; meanwhile, the separation of different heat exchange units of the direct cooling plate 10 also accelerates its response speed; furthermore, compared with the conventional structure, the pressure drop due to friction in the direct cooling plate 10 can be greatly reduced by dividing the entire flow path into multiple individually controlled flow paths.

[0032] It should be noted that the above-mentioned battery may be a power battery 300 or other battery that has different heating temperatures in different areas during charging, discharging or use. A specific structure of the direct cooling plate 10 is described below using the power battery 300 as an example, but it should not be understood to limit the scope of protection of the present disclosure.

[0033] The positions of the inlets 101 and outlets 102 of the multiple heat exchange channels 100 can be constructed in any suitable manner. Considering the convenience of connection with a cooling system (such as an air conditioning system), in some embodiments, the inlets 101 and outlets 102 of the heat exchange channels are located on the same side of the direct cooling plate 10. For each heat exchange channel 100, the inlets 101 and outlets 102 of the heat exchange channel 100 are located on the same side of the direct cooling plate 10. For multiple heat exchange channels 100, the inlets 101 and outlets 102 of the multiple heat exchange channels 100 are also located on the same side of the direct cooling plate 10, making it suitable for connecting with an external air conditioning system through fittings 200, simplifying the overall structure and saving parts and space occupation.

[0034] The heat exchange channels 100 may be arranged according to actual requirements, and the arrangement method is not limited. A special arrangement may be made according to the heating area of ​​the battery.

[0035] The power battery 300 has a high energy density and a large capacity, and different parts of the battery cell often generate different amounts of heat. In particular, the heat generated by the electrodes at both ends of the battery cell is greater than that in the middle of the battery cell. However, conventional coolers use a single inlet and outlet to uniformly cool or heat the cold plate. Even if the maximum temperature of the battery cell can be reduced, it does not significantly improve the overall temperature difference of the battery cell, which greatly affects the service life of the power battery 300.

[0036] Meanwhile, due to uneven heating of the battery, the heat exchange demand varies at different locations. Current technology is actually designed based on the maximum heat transfer capacity of every part, which leads to significant energy waste and also affects the power distribution of the compressor at the end of the vehicle. In fact, due to the urgent demand for fast charging and the lagging development of high-power compressors, battery thermal management under high-rate charging has become an urgent problem to be solved in the industry.

[0037] Considering the above situation, to improve the temperature difference of the power battery 300, some embodiments of the present disclosure have two heat exchange channels 100, namely, channel 1 110 and channel 2 120, as shown in FIGS. 2, 7, and 8, where channel 1 110 is surrounded by channel 2 120. Among them, channel 1 110 corresponds to the positive and negative poles at positions A on both ends of the power battery 300, which are areas where heat generation is high. Channel 2 120 corresponds to the middle position B of the battery cells of the power battery 300, which is an area where heat generation is relatively low. The cooling capacities of channel 1 110 and channel 2 120 can be controlled differently, i.e., the cooling capacity of channel 1 110 is greater than that of channel 2 120. Channel 1 110, which has a stronger cooling capacity, is used to cool the two end positions A of the power battery 300 where heat generation is higher, while channel 2 120, which has a relatively weaker cooling capacity, is used to cool the middle position B of the power battery 300 where heat generation is lower, thereby solving the problem of uneven heat generation among the battery cells, reducing the temperature difference among the battery cells, and improving the service life of the battery pack. At the same time, the heat exchange channel 100 is divided into two, forming two heat exchange units whose temperatures can be controlled and regulated individually. Compared to the conventional arrangement of heat exchange channels, this reduces the pressure difference along the way to a certain extent, thereby avoiding uneven flow distribution along the way and improving local overheating of the cooling plate.

[0038] It should be noted that in extremely cold regions where the outside temperature is low, it is necessary to heat the power battery 300 to ensure the performance of the power battery 300. At this time, the air conditioning system may be in a heating mode, in which case, channel 1 110 corresponds to the positive and negative poles at position A on both ends of the power battery 300, where heat generation is relatively large, and channel 2 120 corresponds to the middle position B of the battery cell of the power battery 300, where heat generation is relatively small. The heating capacities of channel 1 110 and channel 2 120 can be controlled differently, i.e., the heating capacity of channel 1 110 is smaller than that of channel 2 120. By using channel 1 110 with weaker heating capacity to heat the two end positions A of the power battery 300 where heat generation is higher, and using channel 2 120 with relatively stronger heating capacity to heat the middle position B of the power battery 300 where heat generation is lower, different heating requirements can be used to improve the temperature uniformity of the battery cells, reduce the temperature difference, and also improve the life of the battery pack.

[0039] Additionally, cooling can also be achieved through channel 1 110 and heating can be achieved through channel 2 120. That is, of the multiple heat exchange channels 100 in the disclosed direct cooling plate 10, some are used for cooling and some are used for heating to meet the simultaneous cooling and heating requirements of the battery.

[0040] Additionally, the coolant flow rate can be prioritized to channel 1 110. The area with the higher temperature can be cooled or heated first. After a certain time, the coolant flow rate can be allocated to channel 2 120 as needed to achieve cooling or heating of both the cooler and warmer areas, improving the temperature difference.

[0041] It should be noted that the cooling or heating of channel 1 110 and channel 2 120 can be achieved by separately introducing different refrigerants and controlling the cooling or heating capacity of the two channels, which can also be connected separately to the same refrigeration system. For example, in a vehicle air conditioning refrigeration system, an electronic expansion valve is installed upstream of the flow of channel 1 110 and channel 2 120 to control the flow rate and evaporation pressure of the refrigerant entering the two flow paths, thereby achieving compressor power distribution and achieving different cooling or heating capacities of the two flow paths. Prior art on air conditioning refrigeration systems will not be described in detail here.

[0042] It allows precise control of the partitions without having to design according to the maximum heat exchange capacity of every section, which leads to significant energy waste and affects compressor power distribution at the ends of the car, making it more energy efficient and providing more compressor power to the entire car.

[0043] The specific arrangement of Channel 1 110 and Channel 2 120 can adopt any suitable structure, as shown in Figures 2, 3, 4, and 5. In some embodiments disclosed herein, Channel 2 120 has a generally concave shape. Channel 1 110 includes two first cooling sections 1121 and a second cooling section 1122 connected between the two first cooling sections 1121. The second cooling section 1122 extends into a recess 124 formed by Channel 2 120, and the two first cooling sections 1121 are surrounded by the outer periphery of Channel 2 120. As shown in Figure 4, Channel 2 120 has a generally concave shape, which means that Channel 2 120 mainly includes two sections, an upper section and a lower section, and a recess 124 with a right opening is formed between these two sections. 3, the two first cooling sections 1121 of the channel 1 110 are placed outside the channel 2 120, and the second cooling section 1122 used to connect the two first cooling sections 1121 extends into the recess 124 of the channel 2 120. The two first cooling sections 1121 of the channel 1 110 correspond to the positive and negative poles of the two end positions A of the power battery 300, and the second cooling section 1122 corresponds to the middle position of the battery cell. This is mainly because the two end regions of the power battery 300 generate a large amount of heat, while the middle portion of the battery cell generates a large amount of heat. Due to the difficulty of heat dissipation and the possibility of high temperature at position B, the second cooling section 1122 is configured accordingly to realize rapid cooling by improving the cooling capacity; at the same time, the upper and lower parts of channel 2 120, which correspond to the two ends and the middle position of the battery, are cooled in a relatively weaker manner to control the temperature difference of the power battery 300, improve the service life of the battery, and ensure the normal use of the vehicle.

[0044] It should be noted that the inlet 101 and outlet 102 of channel 1 110 and channel 2 120 are both located on the left side, i.e., both the inlet 101 and the outlet 102 are located on the left side, which can be connected via a fitting 200 to simplify the connection structure.

[0045] In other embodiments, Channel 1 110 may be approximately square in shape, and Channel 2 120 may be any other channel formed inside the square-shaped Channel 1 110. Channel 1 110 is configured to have a strong cooling capacity to cool the positive and negative electrodes at positions A on both ends of the battery, while Channel 2 120 is configured to have a weaker cooling capacity to cool the middle position B of the battery cell.

[0046] It should be noted that when heating is required, the coolants in Channel 1 110 and Channel 2 120 can be switched to heat the middle position B of the battery cell, which corresponds to Channel 2 120 with stronger heating power. Channel 1 110 is set to have weaker heating power and is used to heat the positive and negative poles at positions A on both ends of the battery.

[0047] It is worth noting that the special structure of channel 1 110 and channel 2 120 may be designed according to the change of the heat load, and is not limited to the above arrangement type.

[0048] 3, in some embodiments, the channel 1 110 includes a first branch channel 111, a first cooling channel 112, and a first confluence channel 113, which are connected in sequence, and each of the first branch channel 111, the first cooling channel 112, and the first confluence channel 113 includes at least two sub-channels. The number of sub-channels in the first cooling channel 112 is greater than the number of sub-channels in the first branch channel 111 and the first confluence channel 113. Among other things, the first cooling channel 112 forms the two cooling sections, the first cooling section 1121 and the second cooling section 1122, mentioned above, and the first branch channel 111 and the first confluence channel 113 form the inlet 101 and the outlet 102, respectively, at one end remote from the first cooling channel 112. The number of sub-channels in the first cooling channel 112 is greater than that in the first branch channel 111 and the first merging channel 113, thereby increasing the cooling area to meet the requirements of the area to be cooled.

[0049] 4, the channel 2 120 includes a second branch channel 121, a second cooling channel 122, and a second merging channel 123, which are connected in sequence. Each of the second branch channel 121, the second cooling channel 122, and the second merging channel 123 includes at least two sub-channels. The number of sub-channels in the second cooling channel 122 is greater than the number of sub-channels in the second branch channel 121 and the second merging channel 123. The second cooling channel 122, together with the second branch channel 121 and the second merging channel 123, forms the aforementioned concave shape. The second cooling channel 122 is concave from right to left, forming a recess 124 for accommodating the second cooling portion 1122. The second branch channel 121 and the second merging channel 123 form an inlet 101 and an outlet 102, respectively, at one end remote from the second cooling channel 122. The number of sub-channels in the second cooling channel 122 is greater than that in the second branch channel 121 and the second merging channel 123, which can also increase the cooling area to meet the requirements of the area to be cooled.

[0050] In some embodiments, the first divergence channel 111, the first confluence channel 113, the second divergence channel 121 and the second confluence channel 123 may all include two sub-channels, while the first cooling channel 112 may include four sub-channels, with each two sub-channels of the first cooling channel 112 connecting to the sub-channels of the first divergence channel 111 and the first confluence channel 113, and the second cooling channel 122 may include eight sub-channels, with every four sub-channels of the second cooling channel 122 connected to a sub-channel of the second divergence channel 121 and the second confluence channel 123, further improving the cooling uniformity in a certain temperature band while meeting the divergence requirements.

[0051] In order to further reduce pressure drop, minimize temperature differences caused by pressure changes in the direct cooling plate 10, and reduce energy consumption losses, in some embodiments, the first branch channel 111 and the first converging channel 113 have the same number of sub-channels, and the second branch channel 121 and the second converging channel 123 have the same number of sub-channels. In channel 1 110, the refrigerant entering the first branch channel 111 from the inlet 101 passes through the first cooling channel 112 and then discharges through the first converging channel 113, which has the same number of sub-channels, to avoid pressure drop in channel 1 110. Similarly, in channel 2 120, the refrigerant entering the second branch channel 121 from the inlet 101 passes through the second cooling channel 122 and then discharges through the second converging channel 123, which has the same number of sub-channels, to also avoid pressure drop in channel 2 120.

[0052] The direct cooling plate 10 can be constructed in any suitable manner, as shown in FIGS. 5 and 6 . In some embodiments, the direct cooling plate 10 includes interconnected plate 1 11 and plate 2 12. Plate 1 11 is provided with grooves 1 11a and 2 11b recessed in a direction away from plate 2 12, and groove 1 11a is surrounded by groove 2 11b. Plate 2 12 and groove 1 11a surround channel 1 110, while plate 2 12 and groove 2 11b surround channel 2 120. It should be noted that grooves 1 11a and 2 11b having the same shape can also be formed simultaneously in board 111 and board 212. Among these, grooves 1 11a and groove 2 11b are partial structures of channel 1 110 and channel 2 120, respectively. When board 111 and board 212 are connected, groove 111a of board 111 and groove 111a of board 212 jointly surround channel 1110, and groove 211b of board 111 and groove 211b of board 212 jointly surround channel 2120. In particular, the shape of groove 111a of plates 111 and 212 may be half the structure of channel 1110, that is, the two grooves 111a are mirror-symmetric. For example, when channel 1110 is circular, both grooves 111a are semicircular, and the structure of groove 211b of plates 111 and 212 can refer to groove 111a, which will not be repeated here.

[0053] Groove 1 11a and Groove 2 11b can be constructed in any suitable manner, as shown in Figure 5. In some embodiments disclosed herein, Groove 1 11a and Groove 2 11b are formed by stamping, and Plate 1 11 and Plate 2 12 may both be metal plates, with Groove 1 11a and Groove 2 11b mentioned above being formed using stamping techniques. It should be noted that Groove 1 11a and Groove 2 11b can also be formed by integral molding or machining.

[0054] Plate 1 11 and plate 2 12 can be connected in any suitable manner. In some embodiments, plate 1 11 and plate 2 12 are connected by brazing, and the specific brazing process can be found in the related art, which will not be repeated here.

[0055] The present disclosure provides a direct cooling plate 10 that includes two independent heat exchange channels 100 to meet the heat exchange needs of different areas of a battery. Unlike conventional coolers, this direct cooling plate 10 focuses on meeting the cooling or heating needs of different areas of a battery, providing greater cooling capacity to the higher heat generating areas at both ends of the battery cell, improving the temperature difference of the battery. It has the following characteristics:

[0056] Two heat exchange channels 100 are adopted, and each heat exchange channel 100 includes an inlet 101 and an outlet 102 in its structure. Each inlet 101 controls the flow rate in the heat exchange channel 100 corresponding to a different region individually, and the cooling distribution between different regions is achieved by adjusting the flow rate schedule of the different inlets 101. At the same time, the arrangement of the two heat exchange channels 100 is adopted to reduce the internal pressure drop, balance the evaporation temperature of the refrigerant in the channel, and reduce the temperature difference along the channel.

[0057] The two heat exchange channels 100 are designed independently with temperature control zones. Channel 1 110 is located in the high-heat-generation area of ​​the battery cell, and channel 2 120 is located in the low-heat-generation area of ​​the battery cell. This achieves different heat exchange rates of the refrigerant in different channels, thereby reducing the temperature difference of the battery.

[0058] The direct cooling plate 10 employs an integrated stamping and brazing design, integrating independent flow passages for high space utilization.

[0059] Compared to the related art, the present disclosure distinguishes between the differences in thermal loads in different regions from the perspective of thermal management effectiveness, which is beneficial for managing the temperature difference in the battery and resolving the problem of uneven heating inside the battery. From a design perspective, it has a more flexible adjustment method and a faster response speed due to the use of a direct cooling plate 10 including at least two heat exchange channels, thereby enabling better and more accurate control of the temperature difference in the battery. The direct cooling plate 10 has excellent geometric flexibility and does not require secondary design for thermal management of small areas. The direct cooling plate 10 can reduce frictional resistance along the way, resulting in excellent energy savings.

[0060] In a second aspect of the present disclosure, there is also provided a heat exchanger 1 including the above-described direct cooling plate 10. As such, the heat exchanger 1 also has all the advantages of the direct cooling plate 10 mentioned above, which will not be repeated here.

[0061] In particular, when the inlets 101 and outlets 102 of multiple heat exchange channels are directly located on the same side of the cooling plate 10, the heat exchanger 1 also includes a joint 200. The joint 200 is equipped with multiple connecting channels that correspond one-to-one to and connect with the inlets 101 and outlets 102 of each heat exchange channel 100, thereby simplifying the connection structure between the heat exchanger and the air conditioning system, improving the connection efficiency, and saving space occupation.

[0062] A third aspect of the present disclosure also provides a power battery pack 1000 including a power battery 300. The power battery pack 1000 further includes the aforementioned heat exchanger 1 attached to the power battery 300 for cooling and / or heating the power battery 300. It should be noted that bonding of the heat exchanger 1 to the power battery 300 can be understood as direct bonding of the heat exchanger 1 to the power battery 300 or fixing the heat exchanger 1 to the power battery 300 with a thermally conductive adhesive. The heat exchanger 1 is fixed to the power battery 300 via the thermally conductive adhesive.

[0063] The power battery 300 may be a blade battery, a long, thin battery stacked in one direction. Especially when equipped with high-power charging, positions A at both ends of the battery generate a large amount of heat, causing the temperature on both sides of the entire battery to rise excessively. The heat exchanger 1 receives refrigerant from the air conditioning and refrigeration system. At this point, the channels 1 110 corresponding to both ends begin to supply refrigerant at maximum output, lowering the temperature on both ends of the battery and reducing heat accumulation on both ends. The heat exchanger waits until the temperature at position B, in the middle of the battery cell, slowly rises. It then allocates part of the compressor power to the middle section, slowly introducing refrigerant, adjusting the amount of refrigerant introduced according to the temperature change in the middle section.

[0064] 9, the fourth aspect of the present disclosure also provides a vehicle 2000 including the power battery pack 1000 described in the third aspect of the present disclosure. As such, the vehicle 2000 also has all the advantages of the power battery pack 1000 described above, which will not be repeated here.

[0065] The preferred embodiments of the present disclosure have been described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the embodiments described above. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, all of which fall within the protection scope of the present disclosure.

[0066] Furthermore, it should be noted that the specific technical features described in the above embodiments can be combined in any suitable manner without contradiction, and in order to avoid unnecessary repetition, the present disclosure does not individually describe the various possible combinations.

[0067] In addition, the various different embodiments disclosed in the present disclosure can also be arbitrarily combined unless it is contrary to the idea disclosed in the present disclosure, and they should also be considered as contents disclosed in the present disclosure.

Claims

1. A direct cooling plate (10) comprising a plurality of heat exchange channels (100) disposed within the direct cooling plate, each heat exchange channel (100) having an inlet (101) for a refrigerant to enter therein and an outlet (102) for the refrigerant to exit therefrom, at least one said heat exchange channel (100) being disposed circumferentially around another said heat exchange channel (100); Each heat exchange channel (100) forms a heat exchange unit in the direct cooling plate (10), and the heat exchange unit is configured to exchange heat in different temperature regions of the battery. Direct cooling plate (10).

2. The direct cooling plate (10) of claim 1, wherein the inlet (101) and the outlet (102) of the heat exchange channel (100) are located on the same side of the direct cooling plate (10).

3. 2. The direct cooling plate (10) of claim 1, wherein the number of the heat exchange channels (100) is two, namely, channel 1 (110) and channel 2 (120), and the channel 1 (110) is disposed around the outside of the channel 2 (120).

4. 4. The direct cooling plate (10) of claim 3, wherein the channel 2 (120) is generally concave, the channel 1 (110) comprises two first cooling sections (1121) and a second cooling section (1122) connected between the two first cooling sections (1121), the second cooling section (1122) extending into a recess (124) formed by the channel 2 (120), and the two first cooling sections (1121) being circumferentially arranged around the outside of the channel 2 (120).

5. The channel 1 (110) comprises a first branch channel (111), a first cooling channel (112), and a first confluence channel (113) which are sequentially connected to one another, each of the first branch channel (111), the first cooling channel (112), and the first confluence channel (113) comprises at least two sub-channels, and the number of the sub-channels of the first cooling channel (112) is greater than the number of the sub-channels of the first branch channel (111) and the first confluence channel (113). and / or the channel 2 (120) comprises a second branch channel (121), a second cooling channel (122), and a second confluence channel (123) that are sequentially connected to one another, each of the second branch channel (121), the second cooling channel (122), and the second confluence channel (123) comprises at least two sub-channels, and the number of the sub-channels in the second cooling channel (122) is greater than the number of the sub-channels in the second branch channel (121) and the second confluence channel (123).

6. the number of the sub-channels of the first branch channel (111) and the first joining channel (113) is the same; The direct cooling plate (10) of claim 5, wherein the number of the sub-channels of the second branch channel (121) and the second merge channel (123) are the same.

7. 5. The direct cooling plate (10) according to claim 3 or 4, wherein the direct cooling plate (10) comprises interconnected plates 1 (11) and 2 (12), the plate 1 (11) being provided with grooves 1 (11a) and 2 (11b) recessed in a direction away from the plate 2 (12), the groove 1 (11a) being arranged around the outside of the groove 2 (11b), the plate 2 (12) and the groove 1 (11a) surrounding the channel 1 (110), while the plate 2 (12) and the groove 2 (11b) surrounding the channel 2 (120).

8. The groove 1 (11a) and the groove 2 (11b) are formed by stamping. and / or the direct cooling plate (10) according to claim 7, wherein said plate 1 (11) and said plate 2 (12) are connected by brazing.

9. A heat exchanger (1) comprising a direct cooling plate (10) according to any one of claims 1 to 4.

10. A power battery pack (1000) comprising a power battery (300), further comprising a heat exchanger (1) according to claim 9, the heat exchanger (1) being attached to the power battery (300) for cooling and / or heating the power battery (300).

11. A vehicle (2000) comprising the power battery pack (1000) of claim 10.

Images