Heat exchange plate, battery pack and power utilization system

Abstract

The utility model discloses a heat exchange plate, battery pack and power utilization system, the heat exchange plate comprises two runner layers laminated along the thickness direction, the runners of the two runner layers are mutually independent, the runner surface of one runner layer and the non-runner surface of the other runner layer are oppositely arranged in the thickness direction, the runner surface of the other runner layer is opposite to the runner surface of the other runner layer, and the runner surface of the other runner layer is opposite to the runner surface of the other runner layer. Therefore, complementation of the two flow channels is achieved. The two independent and complementary flow channels are adopted, a refrigerant can flow into the two flow channels at the same time for heat exchange, and the heat exchange efficiency of the heat exchange plate is improved. The two flow channels are distributed in a staggered mode, the temperature gradient of the whole process can be reduced, and therefore the temperature difference of the heat exchange plate is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange, in particular to a heat exchange plate, a battery pack and an electric power system. Background Art

[0002] New energy power battery systems generally adopt the forms of air cooling, liquid cooling and direct cooling, and the common method is liquid cooling. Among them, the stamping brazing plate, as a heat exchanger that can exchange heat, has been widely used in the battery thermal management of new energy.

[0003] In the related art, the flow channels of the existing liquid cooling plates usually adopt one-way flow channels, with poor heat exchange effect and poor temperature uniformity performance. Summary of the Utility Model

[0004] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a heat exchange plate to improve the heat exchange efficiency.

[0005] The heat exchange plate according to the first aspect embodiment of the utility model includes two flow channel layers stacked along the thickness direction. The flow channels of the two flow channel layers are independent of each other, and the flow channel surface of one flow channel layer is disposed opposite to the non-flow channel surface of the other flow channel layer in the thickness direction to achieve the complementarity of the two flow channels.

[0006] The heat exchange plate according to the embodiment of the utility model adopts two independent and complementary flow channels, which can enable the refrigerant to flow into the two flow channels simultaneously for heat exchange, improving the heat exchange efficiency of the heat exchange plate. Moreover, the two flow channels are staggered, which can effectively reduce the temperature gradient of the whole process, thereby effectively reducing the temperature difference of the whole heat exchange plate and improving the temperature uniformity.

[0007] According to some embodiments of the utility model, the flow channel layer is a flow channel plate, and flow channel grooves are provided on the inner sides of the two opposite flow channel plates. The flow channel groove of one flow channel plate is sealed by the inner surface of the other flow channel plate.

[0008] According to some embodiments of the utility model, the flow channel layer is a cold plate, and the flow channel is provided inside the cold plate.

[0009] According to some embodiments of the utility model, the flow channel of one flow channel layer surrounds the flow channel of the other flow channel layer.

[0010] According to some embodiments of the utility model, the flow channel includes: an inlet water flow channel; an outlet water flow channel, and a plurality of branch flow channels are provided between the inlet water flow channel and the outlet water flow channel. The inlet water flow channel and the outlet water flow channel of one flow channel layer surround the inlet water flow channel and the outlet water flow channel of the other flow channel layer, and the plurality of branch flow channels of the two flow channel layers surround each other.

[0011] According to some embodiments of the present utility model, the water inlet flow channel and the water outlet flow channel of one of the flow channel layers are respectively arranged offset in the thickness direction from the water outlet flow channel and the water inlet flow channel of the other flow channel layer.

[0012] According to some embodiments of the present utility model, the water inlet flow channel and the water outlet flow channel surround a plurality of the branch flow channels, the flow channel layer includes at least two flow splitting regions, and the plurality of branch flow channels are bent and extended within one of the flow splitting regions and then converge and extend to an adjacent one of the flow splitting regions.

[0013] According to some embodiments of the present utility model, the plurality of branch flow channels in two adjacent flow splitting regions are symmetrically arranged with respect to the center line between the two flow splitting regions.

[0014] According to some embodiments of the present utility model, the flow channel further includes: a confluence flow channel, and two ends of the confluence flow channel are respectively connected to the plurality of branch flow channels in one of the flow splitting regions and the plurality of branch flow channels in the other flow splitting region.

[0015] According to some embodiments of the present utility model, each of the branch flow channels is bent back and forth within the flow splitting region to form a plurality of bent segments.

[0016] According to some embodiments of the present utility model, the plurality of branch flow channels are bent and extended side by side.

[0017] According to some embodiments of the present utility model, the outer sides of the two flow channel layers facing away from each other are both flat surfaces.

[0018] According to some embodiments of the present utility model, the flow directions of the two flow channels adopt a countercurrent flow mode

[0019] According to some embodiments of the present utility model, the flow channel is provided with a water inlet and a water outlet, and the positions of the water inlet and the water outlet of one of the flow channels are respectively arranged adjacent in the thickness direction to the positions of the water outlet and the water inlet of the other flow channel.

[0020] According to some embodiments of the present utility model, the heat exchange plate further includes: a joint, the joint is provided with one water inlet hole and two water outlet holes, the water inlets of the two flow channels are communicated with each other, the water inlet hole is communicated with the water inlet of one of the flow channels, and the water outlets of the two flow channels are respectively communicated with the two water outlet holes.

[0021] According to the battery pack of the second aspect embodiment of the present utility model, it includes a plurality of battery cells and the heat exchange plate as described above, and the surfaces of the plurality of battery cells are in contact with the heat exchange plate.

[0022] An electrical power system according to a third aspect embodiment of the present utility model includes the battery pack described above.

[0023] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0025] Figure 1 is a schematic structural diagram of a heat exchange plate according to an embodiment of the present utility model;

[0026] Figure 2 is an exploded schematic diagram of a heat exchange plate according to an embodiment of the present utility model;

[0027] Figure 3 is a schematic cross-sectional view of a heat exchange plate according to an embodiment of the present utility model;

[0028] Figure 4 is a schematic plan view of the outside of a flow channel plate according to an embodiment of the present utility model;

[0029] Figure 5 is a schematic diagram of the flow channel structure inside a flow channel plate according to an embodiment of the present utility model;

[0030] Figure 6 is a schematic plan view of the outside of another flow channel plate according to an embodiment of the present utility model;

[0031] Figure 7 is a schematic diagram of the flow channel structure inside another flow channel plate according to an embodiment of the present utility model;

[0032] Figure 8 is a schematic diagram of the complementary flow channels of two flow channel plates according to an embodiment of the present utility model;

[0033] Figure 9 is a schematic diagram of the structure of a joint according to an embodiment of the present utility model;

[0034] Figure 10 is an assembly schematic diagram of a heat exchange plate and multiple battery cells according to an embodiment of the present utility model.

[0035] Reference Signs:

[0036] 100, heat exchange plate; 1, flow channel plate; 11, connection hole; 12, flow channel groove; 2, flow channel; 21, inlet water flow channel; 22, outlet water flow channel; 23, branch flow channel; 231, bent section; 24, confluence flow channel; 3, flow channel layer; 4, shunt area; 5, water inlet; 6, water outlet; 7, joint; 71, inlet hole; 72, outlet hole; 200, cell electrode. Detailed implementation manners

[0037] The embodiments of the present utility model will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present utility model will be described in detail below.

[0038] Next, refer to Figures 1-10 Describe the heat exchange plate 100 according to the embodiments of the present utility model.

[0039] As Figure 3 shown, the heat exchange plate 100 includes two flow channel layers 3 stacked along the thickness direction. The flow channels 2 of the two flow channel layers 3 are independent of each other, and the flow channel surface of one flow channel layer 3 and the non-flow channel surface of the other flow channel layer 3 are oppositely arranged in the thickness direction to achieve the complementarity of the two flow channels 2.

[0040] In other words, the flow channels 2 of the two flow channel layers 3 are not only independent of each other, but also the flow channels 2 of the two flow channel layers 3 are staggered with each other, so that the flow channels 2 of one flow channel layer 3 are projected on the non-flow channel surface of the other flow channel layer 3, enabling the two flow channels to achieve complementarity.

[0041] With such an arrangement, the refrigerant can not only flow into the two flow channels 2 simultaneously for heat exchange, improving the heat exchange efficiency. Moreover, the two flow channels 2 are staggered, which can reduce the temperature gradient of the entire process, thereby effectively reducing the temperature difference of the entire heat exchange plate 100.

[0042] Thus, the heat exchange plate 100 of the present application adopts two independent and complementary flow channels 2, which can achieve the following effects: the refrigerant can flow into the two flow channels 2 simultaneously for heat exchange, improving the heat exchange efficiency of the heat exchange plate 100. And, the two flow channels 2 are staggered, which can effectively reduce the temperature gradient of the entire process, thereby improving the temperature uniformity of the entire heat exchange plate 100. At the same time, when the flow channels 2 are arranged on the upper and lower layers of the heat exchange plate 100, when the pressure in the flow channels 2 increases, the deformation of the entire heat exchange plate 100 caused by the expansion of the flow channels 2 will cancel each other out, reducing the pressure-resistant deformation of the heat exchange plate 100 and improving the flatness of the plate surface of the heat exchange plate 100, thereby ensuring the stable assembly of the heat exchange plate 100 with external components. In addition, by adopting two flow channel layers 3, the flow channel forms of each can be designed separately according to the heat generation characteristics of the battery pack, increasing the design flexibility. And, the two flow channel layers 3 cooperate with each other to strengthen the overall structural strength of the heat exchange plate 100.

[0043] According to an embodiment of the present utility model, see Figures 2-7, the flow channel layer 3 is a flow channel plate 1. Flow channel grooves 12 are provided on the inner sides of the two opposite flow channel plates 1, and the flow channel groove 12 of one flow channel plate 1 is sealed by the surface on the inner side of the other flow channel plate 1.

[0044] Specifically, the two flow channel plates 1 are stacked, and flow channel grooves 12 are provided on the inner sides of the two opposite flow channel plates 1, so that the flow channel groove 12 of one flow channel plate 1 can be covered and sealed by the surface on the inner side of the other flow channel plate 1, thereby forming two independent and complementary flow channels 2. In this way, the two flow channel plates 1 cooperate with each other to reduce the number of flow channels 2 respectively, reduce the manufacturing difficulty, and improve the quality.

[0045] In the embodiment disclosed in the present application, the two flow channel plates 1 are both stamping plates, and the flow channel grooves 12 are processed inside the two flow channel plates 1. The flow channel grooves 12 can be processed by milling or stamping. The flow channel surfaces and brazing surfaces of the two flow channel plates 1 are staggered from each other, that is, the flow channel surface of one flow channel plate 1 corresponds to the brazing surface of the other flow channel plate 1, so that the two flow channel plates 1 jointly close to form an interleaved three-dimensional flow channel layer 3. Among them, the two flow channel plates 1 are relatively connected by welding to form a heat exchange plate 100.

[0046] According to another embodiment of the present invention, the flow channel layer 3 is a cold plate, and a flow channel 2 is provided inside the cold plate.

[0047] Specifically, compared with the above-mentioned flow channel plate 1, the cold plate is provided with a cover plate on the surface of the flow channel plate 1 where the flow channel groove 12 is located, thereby forming a cold plate structure. That is, the cold plate includes a flow channel plate 1 and a cover plate, and the cover plate is covered on the flow channel groove 12 of the flow channel plate 1 to form the flow channel 2 of the cold plate. Among them, the cover plate can be a heat pipe.

[0048] The heat exchange plate 100 includes two cold plates stacked, and the heat pipes of the two cold plates are arranged back to back, so that the heat pipes are close to or in contact with the surface of the battery cell. The flow channels 2 of the two cold plates are independent and complementary, ensuring the sealing and independence of the flow channels 2 of the two flow channel layers 3 respectively, and facilitating installation, maintenance and replacement.

[0049] Further, the flow channel 2 of one flow channel layer 3 surrounds the flow channel 2 of the other flow channel layer 3. In this way, since the two flow channels 2 adopt a complementary form, and the flow channel 2 of one flow channel layer 3 surrounds the flow channel 2 of the other flow channel layer 3, when the refrigerant flows into the two flow channels 2 at the same time for heat exchange, the temperature gradient of the entire refrigerant flow path can be further reduced, thereby better reducing the temperature difference of the entire heat exchange plate 100 and improving the temperature uniformity.

[0050] Further, the sum of the projected areas of the flow channel surfaces of the two flow channel layers 3 on the surface of any flow channel layer 3 covers the surface of the flow channel layer 3 as much as possible to increase the heat exchange area, thereby further improving the heat exchange efficiency and temperature uniformity of the heat exchange plate 100.

[0051] Further, the flow channel 2 includes an inlet flow channel 21 and an outlet flow channel 22. A plurality of branch flow channels 23 are provided between the inlet flow channel 21 and the outlet flow channel 22. The inlet flow channel 21 and the outlet flow channel 22 of one flow channel layer 3 surround the inlet flow channel 21 and the outlet flow channel 22 of another flow channel layer 3, and the plurality of branch flow channels 23 of the two flow channel layers 3 surround each other.

[0052] With such an arrangement, as Figures 5-8 shown, the inlet flow channel 21 and the outlet flow channel 22 of one flow channel layer 3 surround the inlet flow channel 21 and the outlet flow channel 22 of another flow channel layer 3, which can reduce the temperature gradient when the refrigerant enters and exits the water, and the plurality of branch flow channels 23 of the two flow channel layers 3 surround each other, which can reduce the temperature gradient of the refrigerant in the branch flow channel 23, so as to further reduce the temperature gradient of the entire refrigerant flow process, thereby improving the temperature uniformity of the entire heat exchange plate 100.

[0053] In the embodiment disclosed in the present application, the inlet flow channel 21 and the outlet flow channel 22 of the flow channel layer 3 are distributed in the peripheral area of the flow channel layer 3, and the plurality of branch flow channels 23 are distributed in the area of the flow channel layer 3 except the peripheral side.

[0054] According to some specific embodiments of the present invention, the inlet flow channel 21 and the outlet flow channel 22 of one flow channel plate 1 are staggeredly arranged in the thickness direction with the outlet flow channel 22 and the inlet flow channel 21 of another flow channel plate 1 respectively.

[0055] It can be understood that, in order to better ensure the temperature uniformity effect of the heat exchange plate 100, based on the complementary structure of the upper and lower layers of the flow channels 2, the inlet flow channel 21 and the outlet flow channel 22 of one flow channel plate 1 are staggeredly arranged in the thickness direction with the outlet flow channel 22 and the inlet flow channel 21 of another flow channel plate 1 respectively. When the refrigerant flows into the two flow channels 2, the flow directions of the refrigerant in the two flow channels 2 are opposite, and the temperatures of the refrigerant flowing out of the two paths can be made to be not very different, which can effectively reduce the temperature gradient of the flow process to better achieve the temperature uniformity of the heat exchange plate 100.

[0056] According to some specific embodiments of the present invention, the inlet flow channel 21 and the outlet flow channel 22 surround a plurality of branch flow channels 23. The flow channel layer 3 includes at least two flow splitting regions 4, and the plurality of branch flow channels 23 are bent and extended in one flow splitting region 4 and then converge and extend to an adjacent flow splitting region 4.

[0057] In the embodiment disclosed in the present application, the flow channel plate 1 includes two flow splitting regions 4. The plurality of branch flow channels 23 are communicated with the inlet flow channel 21. The plurality of branch flow channels 23 are bent and extended in one flow splitting region 4 and then converge and extend to another flow splitting region 4. The plurality of branch flow channels 23 are bent and extended in another flow splitting region 4 and are communicated with the outlet flow channel 22.

[0058] With such a setting, the flow channel layer 3 is divided into diversion areas 4 to arrange multiple branch flow channels 23, so that the temperature of the refrigerant in each of the multiple branch flow channels 23 is approximately the same when entering a diversion area 4, effectively reducing the temperature gradient of the multiple branch flow channels 23, thereby better reducing the temperature difference of the entire heat exchange plate 100.

[0059] Further, the multiple branch flow channels 23 in two adjacent diversion areas 4 are symmetrically arranged with respect to the center line between the two diversion areas 4.

[0060] With such a setting, the flow direction of the entire flow channel 2 can be made clearer, avoiding a complex and intricate structure. This not only facilitates the flow of the refrigerant but also allows the flow channel forms in each diversion area 4 to be designed separately according to the heat generation characteristics of the battery pack, increasing the design flexibility. At the same time, the manufacturing difficulty can be greatly reduced, and the manufacturing quality can be ensured.

[0061] Figure 5 The shown is the flow channel form of one flow channel layer 3. Figure 7 The shown is the flow channel form of another flow channel layer 3. The flow channels 2 of the two flow channel layers 3 are in a complementary flow channel form. The complementarity of the two flow channels 2 realizes Figure 8 the shown flow channel structure. In this way, the two flow channels 2 can cover the entire surface of the heat exchange plate 100, thereby better improving the heat exchange efficiency and the temperature equalization effect.

[0062] Further, the flow channel 2 further includes: a confluence flow channel 24, and both ends of the confluence flow channel 24 are respectively connected to the multiple branch flow channels 23 of one diversion area 4 and the multiple branch flow channels 23 of another diversion area 4.

[0063] With such a setting, the refrigerant is diverted from the water inlet flow channel 21 into the multiple branch flow channels 23 of one diversion area 4. Then, the multiple branch flow channels 23 of this diversion area 4 are connected to one end of the confluence flow channel 24, thereby neutralizing the temperature of the multiple branch flow channels 23. Then, the other end of the confluence flow channel 24 is connected to the multiple branch flow channels 23 of another diversion area 4, and finally flows out from the water outlet flow channel 22.

[0064] Further, each branch flow channel 23 reciprocally bends in the diversion area 4 to form multiple bending segments 231. With such a setting, the reciprocal bending and extension of the branch flow channel 23 can increase the flow path of the flow channel 2 as much as possible, and at the same time can cover the flow channel layer 3 as much as possible, so that the projected area of the two flow channels 2 on the heat exchange plate 100 is the entire heat exchange area of the heat exchange plate 100, improving the heat exchange efficiency.

[0065] Further, the multiple branch flow channels 23 bend and extend side by side.

[0066] Referring to an embodiment disclosed in the present application, each diversion area 4 includes two branch channels 23. The two branch channels 23 are arranged side by side and reciprocally bent synchronously, and adjacent bending segments 231 are spaced apart, facilitating the complementarity of the channels 2.

[0067] Furthermore, the flow directions of the two channels 2 adopt an opposite flow mode.

[0068] Since the traditional stamping brazing plate uses a unidirectional channel 2, the temperature gradient along the way becomes larger and there is an overheating problem, resulting in a large temperature difference between different parts, which is not conducive to the balanced cooling of the battery module. In the present application, the flow modes of the refrigerants in the two channels 2 are opposite to each other, making the heat carried away by the refrigerants in the two channel layers 3 close, effectively reducing the temperature gradient in the process, reducing the temperature difference, and making the temperature uniformity of the heat exchange plate 100 of the present application better.

[0069] Furthermore, the opposite sides of the two channel layers 3 are both flat surfaces.

[0070] Since the channel surface of the traditional stamping brazing plate protrudes with the channel 2 structure, additional structural parts or caulking are required to fill it into a flat surface when sealing or supporting is needed, resulting in high costs and being unfavorable for the improvement of the overall package energy density. Therefore, the outer surfaces of the two channel layers 3 of the present application are flat structures, improving the assemblability with external components.

[0071] For example, for a battery pack with an upper and lower two-layer module layout scheme, compared with the traditional stamping brazing plate, the upper and lower surfaces of the outside of the heat exchange plate 100 of the present application are both flat surfaces, which can better adapt to the package layout and also improve the overall package energy density.

[0072] Furthermore, the channel 2 is provided with a water inlet 5 and a water outlet 6. The positions of the water inlet 5 and the water outlet 6 of one channel 2 are respectively adjacent to the positions of the water outlet 6 and the water inlet 5 of the other channel 2 in the thickness direction. Such a setting can effectively reduce the temperature gradient at the refrigerant inlet and outlet, improving the temperature uniformity of the heat exchange plate 100.

[0073] Furthermore, the heat exchange plate 100 includes: a joint 7. The joint 7 is arranged on the outside of one of the channel layers 3. The joint 7 is provided with a water inlet hole 71 and two water outlet holes 72. The water inlets 5 of the two channels 2 are communicated with each other. The water inlet hole 71 is communicated with the water inlet 5 of one of the channels 2. The water outlets 6 of the two channels 2 are respectively communicated with the two water outlet holes 72.

[0074] With such a setting, the joint 7 can be welded to the channel layer 3 on the outside of one channel layer 3. Refer to Figure 9In the illustrated embodiment, the joint 7 is provided with a total water inlet hole 71 and two water outlet holes 72. A total water inlet hole 71 communicates with the water inlets 5 of the two flow channels 2, such that the refrigerant flows into the interiors of the two flow channels 2 simultaneously through the water inlet hole 71 and finally flows out respectively from the two water outlet holes 72 of the joint 7. Among them, three connection holes 11 are provided on the flow channel layer 3 welded with the joint 7, and respectively correspond to one water inlet hole 71 and two water outlet holes 72.

[0075] In some embodiments, the joint 7 has a straight-through structure, with small flow resistance, compact structure, and simple processing technology.

[0076] The heat exchange plate 100 of the present application can weld the two flow channel layers 3 and the joint 7 together to form a heat exchange plate 100 that can accommodate the refrigerant flowing in its internal flow channel 2. As Figure 8 shown, the flow route of the refrigerant is: refrigerant - water inlet hole 71 of the joint 7 - one flow channel layer 3 / the other flow channel layer 3 - water outlet hole 72 of the joint 7.

[0077] According to the battery pack of the second aspect embodiment of the present utility model, as Figure 10 shown, the battery pack includes a plurality of battery cells and a heat exchange plate 100. The surfaces of the plurality of battery cells are in contact with the heat exchange plate 100 to heat or cool the plurality of battery cells. Among them, the plurality of battery cells are connected through battery cell electrodes 200.

[0078] According to the power consumption system of the third aspect embodiment of the present utility model, it includes a battery pack.

[0079] Taking the power consumption system of a vehicle as an example of the power consumption system, the joint 7 serves as the only inlet and outlet of the heat exchange plate 100 of the present application. The heat exchange plate 100 can be connected to the air-conditioning system pipeline in the vehicle power consumption system through the joint 7 and is connected in parallel in the vehicle's air-conditioning system, serving as an evaporator or a condenser in the battery pack. Whether the refrigerant flows in the heat exchange plate 100 of the present application is controlled by the vehicle air-conditioning controller, and the evaporation (condensation) of the refrigerant in the heat exchange plate 100 is controlled according to the requirements of the battery pack to achieve the cooling (heating) of the battery pack. The heat exchange plate 100 of the present application can be used in parallel with other evaporators or condensers in the air-conditioning system or the heat exchange plate 100 of the present application can be used alone as an evaporator or a condenser in the air-conditioning system. When used as an evaporator, the liquid refrigerant cools (heats) the inside of the battery pack through evaporation (condensation) in the heat exchange plate 100. When used as a condenser, the gaseous refrigerant condenses in the heat exchange plate 100 to heat the inside of the battery pack.

[0080] Thus, the refrigerant flows inside the heat exchange plate 100 of the present application. Compared with the heat exchange plate 100 with a single-phase liquid flowing inside, the heat exchange plate 100 of the present application has a higher heat exchange efficiency and a higher energy efficiency ratio.

[0081] Therefore, the heat exchange plate 100 of the present application can achieve the following effects:

[0082] First, the heat exchange plate 100 adopts two flow channel layers 3 arranged in a stacked manner. The flow channels 2 of the two flow channel layers 3 are independent, enabling the refrigerant to flow into the two flow channel layers 3 for heat exchange, thereby improving the heat exchange efficiency of the heat exchange plate 100. Moreover, the two flow channels 2 complement each other, which can effectively reduce the temperature gradient of the entire process, thereby effectively reducing the temperature difference of the entire heat exchange plate 100 and improving the temperature uniformity.

[0083] Second, the flow channels 2 are provided inside the two flow channel layers 3, and the external surface is a planar structure. The contact surfaces with the battery cells or the package are all planar, which improves the assemblability with other components and is conducive to improving the grouping efficiency.

[0084] Third, the heat exchange plate 100 adopts an internal flow channel 2 arrangement. The processing method can adopt machining methods such as milling. At the same time, due to the increase in the thickness of the plate and the mutual cooperation of the two flow channel plates 1, the strength of the heat exchange plate 100 can be improved.

[0085] Fourth, the flow mode of the refrigerant in the two flow channel layers 3 is countercurrent convection, so that the heat carried away by the refrigerant in the two flow channel layers 3 is close, which can effectively reduce the temperature gradient difference of the refrigerant flow path, improve the temperature uniformity, and is more conducive to the use and life extension of the battery pack.

[0086] Fifth, when the flow channels 2 are arranged in the upper and lower layers of the heat exchange plate 100, when the pressure in the flow channels 2 increases, the deformation of the entire heat exchange plate 100 caused by the expansion of the flow channels 2 will cancel each other out, reducing the pressure-resistant deformation of the heat exchange plate 100 and improving the flatness of the plate surface of the heat exchange plate 100, thereby ensuring the stable assembly of the heat exchange plate 100 with external components.

[0087] Sixth, the present application uses refrigerant phase change (gas to liquid or liquid to gas) heat transfer, and the heat transfer efficiency is higher than that of traditional single-phase liquid working media. It is more conducive to the cooling and heating of the battery system. For the whole vehicle, the energy efficiency ratio of the air conditioning system is improved, and the energy consumption can be reduced. At the same time, the plate heat exchanger required for single-phase liquid can be omitted, which can reduce the cost.

[0088] Seventh, each of the two flow channel plates 1 can reduce the number of flow channels 2, thereby reducing the manufacturing difficulty and improving the quality.

[0089] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0090] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0091] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A heat exchange plate, characterized in that: It comprises two channel layers stacked in the thickness direction, the channels of the two channel layers are independent of each other, and the channel surface of one channel layer is arranged opposite to the non-channel surface of the other channel layer in the thickness direction to achieve complementarity of the two channel layers.

2. The heat exchange plate according to claim 1, characterized in that: The flow channel layer is a flow channel plate, and flow channel grooves are arranged on the opposite inner sides of the two flow channel plates. The flow channel groove of one flow channel plate is sealed by the inner surface of the other flow channel plate.

3. The heat exchange plate according to claim 1, characterized in that: The flow channel layer is a cold plate, and the flow channel is arranged inside the cold plate.

4. The heat exchange plate according to claim 1, characterized in that: The flow channels of one of the flow channel layers surround the flow channels of another of the flow channel layers.

5. The heat exchange plate according to claim 1, characterized in that: The flow channel comprises: Water inlet channel; A water outlet channel, a plurality of branch channels are arranged between the water inlet channel and the water outlet channel, the water inlet channel and the water outlet channel of one channel layer surround the water inlet channel and the water outlet channel of another channel layer, and the plurality of branch channels of the two channel layers surround each other.

6. The heat exchange plate according to claim 5, characterized in that: The water inlet channel and the water outlet channel of one channel layer are staggered with the water outlet channel and the water inlet channel of another channel layer in the thickness direction.

7. The heat exchange plate according to claim 5, characterized in that: The water inlet channel and the water outlet channel surround a plurality of branch channels, the channel layer includes at least two diversion areas, and a plurality of branch channels bend and extend in one diversion area, then merge and extend to an adjacent diversion area.

8. The heat exchange plate according to claim 7, characterized in that: The plurality of branch flow channels in two adjacent flow diversion areas are symmetrically arranged about a center line between the two flow diversion areas.

9. The heat exchange plate according to claim 7, characterized in that: The flow channel also includes: The converging flow channel has two ends respectively connected to the multiple branch flow channels in one diversion area and the multiple branch flow channels in another diversion area. 10 . The heat exchange plate according to claim 7 , wherein each of the branch flow channels is bent back and forth in the flow diversion area to form a plurality of bent sections. The heat exchange plate according to claim 7 , wherein a plurality of branch flow channels are bent and extended side by side.

12. The heat exchange plate according to claim 1, characterized in that: The outer sides of the two flow channel layers facing each other are both flat.

13. The heat exchange plate according to claim 1, characterized in that: The flow directions of the two flow channels adopt a convection flow mode.

14. The heat exchange plate according to claim 1, characterized in that: The flow channel is provided with a water inlet and a water outlet, and the water inlet position and the water outlet position of one flow channel are respectively arranged adjacent to the water outlet position and the water inlet position of another flow channel in the thickness direction.

15. The heat exchange plate according to claim 14, characterized in that: Also includes: A joint, wherein the joint is provided with a water inlet and two water outlets, the water inlets of the two flow channels are connected to each other, the water inlet is connected to the water inlet of one of the flow channels, and the water outlets of the two flow channels are respectively connected to the two water outlets.

16. A battery pack, characterized in that: It comprises a plurality of battery cells and the heat exchange plate according to any one of claims 1 to 15, wherein surfaces of the plurality of battery cells are in contact with the heat exchange plate.

17. An electricity system, characterized in that: A battery pack comprising the battery pack of claim 16.

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