A cold plate

Abstract

A cold plate relates to the technical field of power battery heat dissipation, and is used for solving the problem of poor local heat dissipation effect of the battery caused by temperature difference of the water inlet and outlet of the cold plate, and prolonging the service life of the battery. The cold plate comprises an upper cold plate, a lower cold plate and an electronic reversing valve. The upper cold plate is used for adhering to the battery cell. The lower cold plate is sealingly arranged on the lower side of the upper cold plate. A plurality of first interfaces and second interfaces are arranged on the plate surface of the lower cold plate away from the upper cold plate in a spaced manner. A plurality of flow channels extending along the distribution direction of the first interfaces and the second interfaces are formed in the lower cold plate. Both ends of each flow channel are communicated with the first interfaces and the second interfaces. The electronic reversing valve is communicated with the first interfaces and the second interfaces through connecting pipes. The electronic reversing valve is controlled by the vehicle BMS. A plurality of temperature sensors are arranged on the battery cell. The vehicle BMS can receive the detection information of the temperature sensors and control the electronic reversing valve to reverse, so that the cooling liquid flows from the first interfaces to the second interfaces through the flow channels, or the cooling liquid flows from the second interfaces to the first interfaces through the flow channels.

Description

Technical Field

[0001] This application relates to the field of power battery heat dissipation technology, and in particular to a cold plate. Background Technology

[0002] As power batteries develop towards higher energy density and miniaturization, the heat generated by their cells has increased significantly, and cold plates are widely used as efficient heat dissipation components.

[0003] In existing technologies, the flow channel structure used for battery pack thermal management mostly adopts a U-shaped flow channel design. Under cooling conditions, the cell temperature in the area corresponding to the cold plate inlet is relatively low, while the cell temperature in the area corresponding to the cold plate outlet is relatively high; under heating conditions, the opposite temperature distribution characteristics are observed.

[0004] Differences in temperature distribution can lead to significant temperature differences between cells located near the inlet and outlet of the flow channel within the battery pack. These temperature differences exacerbate the inconsistent degradation of the cells, thereby shortening the overall lifespan of the battery pack. Utility Model Content

[0005] This application provides a cold plate to address the problem of poor local heat dissipation in the battery caused by the temperature difference between the inlet and outlet of the cold plate, thereby extending battery life.

[0006] This application provides a cold plate, including an upper cold plate, a lower cold plate, and an electronic reversing valve. The upper cold plate is used to bond the battery cell. The lower cold plate is sealed below the upper cold plate. The lower cold plate has a first interface and a second interface spaced apart on its surface away from the upper cold plate. Multiple flow channels extending along the distribution direction of the first and second interfaces are formed inside the lower cold plate. Both ends of each flow channel are connected to the first and second interfaces. The electronic reversing valve is connected to the first and second interfaces respectively through connecting pipes. The electronic reversing valve is controlled and connected to the vehicle BMS. Multiple temperature sensors are configured on the battery cell. The vehicle BMS can receive the detection information from the temperature sensors and control the electronic reversing valve to switch directions, so that the coolant flows from the first interface through the flow channel to the second interface, or the coolant flows from the second interface through the flow channel to the first interface.

[0007] In this application, the upper cooling plate is bonded to the battery cell, and multiple flow channels are formed within the lower cooling plate, connecting the first and second interfaces at both ends. An electronic reversing valve controls the bidirectional flow of coolant. By switching the flow direction through the electronic reversing valve, the coolant periodically changes its flow path, avoiding localized heat accumulation caused by long-term unidirectional flow. For example, when the temperature rises in a certain area of ​​the battery cell due to continuous heat absorption, reverse flow allows the low-temperature coolant to preferentially flow through that area, balancing the overall temperature.

[0008] The vehicle's BMS adjusts the flow direction in real time based on temperature sensor data to achieve precise temperature control. For example, during fast charging, heat is concentrated in the center of the battery cell, and reverse flow can enhance heat dissipation in the center; during low-speed driving, the temperature of the edge cells is lower, and forward flow can preferentially cool the edges. By using coolant that can change the flow direction, continuous temperature differences in the power battery can be avoided, thus improving the battery's lifespan.

[0009] In some embodiments of this application, the two connecting pipes of the electronic reversing valve connecting the first and second interfaces are two independently configured pipes. This avoids mutual interference between the fluids in the two connecting pipes, ensures stable flow during reversal, and prevents flow direction switching delays or uneven flow due to possible pressure fluctuations.

[0010] In some embodiments of this application, the first interface and the second interface are distributed along the length of the lower cold plate, and a flow channel is located between the first interface and the second interface along a distribution direction perpendicular to the first interface and the second interface. The flow channel extends along the interface connection line, shortening the coolant flow path and reducing pressure drop; the flow channel is located between the interfaces, allowing the coolant to be evenly distributed from the interfaces to each flow channel, avoiding insufficient flow in the edge flow channels.

[0011] In some embodiments of this application, the flow channel includes a main flow channel and a plurality of outer flow channels. The main flow channel extends in a straight line along the connection line between the first interface and the second interface. The plurality of outer flow channels are disposed outside the main flow channel. Along the distribution direction perpendicular to the first interface and the second interface, the other flow channels on both sides of the main flow channel are symmetrically distributed about the connection line between the first interface and the second interface.

[0012] The main flow channel is symmetrically distributed on both sides, so that the coolant pressure is balanced when it is split, avoiding the concentration of flow on one side; the main flow channel serves as a supporting frame, and the symmetrical distribution of the outer flow channels enhances the overall rigidity of the cold plate and reduces deformation caused by thermal expansion.

[0013] In some embodiments of this application, the outer channel includes a channel body and channel interfaces located at both ends of the channel body. The channel interfaces communicate with the channel body and extend in the direction of the first interface or the second interface. The spacing between the first interface or the second interface and the ports of all channel interfaces close to the first interface or the second interface is similar or equal.

[0014] The equal-spaced flow channel interfaces ensure consistent flow resistance of the coolant from the interface to each flow channel, avoiding excessive flow at the near end and insufficient flow at the far end. The equal-spaced interfaces reduce local pressure surges, decrease stress concentration at the flow channel connections, and extend the life of the cold plate.

[0015] In some embodiments of this application, along the extension direction of the outer flow channel, the cross-sectional diameters of the flow channel interface and the flow channel body of the same outer flow channel are close to or equal. Consistent cross-sectional diameters prevent turbulence caused by sudden contraction or expansion of the fluid at the interface, reducing energy loss; a stable flow velocity ensures full contact between the coolant and the inner wall of the cold plate, enhancing the convective heat transfer effect.

[0016] In some embodiments of this application, along the distribution direction perpendicular to the first and second interfaces, the cross-sectional width of the main flow channel is smaller than the cross-sectional width of the main flow channel body. The narrower main flow channel forces the coolant to flow preferentially to the outer flow channel, enhancing heat dissipation of the edge cells; the main flow channel is short and narrow, while the outer flow channel is long and wide, thereby making the resistance of different flow channels more similar and ensuring a balanced flow distribution in each flow channel.

[0017] In some embodiments of this application, the cross-sectional width of the main flow channel gradually increases along the direction away from the main flow channel. This increased width increases the cross-sectional area of ​​the outer flow channel, reduces the coolant flow velocity, extends the residence time, and improves the heat dissipation efficiency of the edge cells. The gradual width balances the pressure loss along the flow path, preventing flow rate attenuation due to insufficient pressure in the far-end flow channel. The coolant travels a longer path in the outer flow channel further away from the main flow channel; increasing the flow channel width reduces resistance and helps to make the coolant flow velocities in different flow channels more similar.

[0018] In some embodiments of this application, the electronic directional valve is a two-position four-way solenoid directional valve, with its inlet connected to the outlet of the coolant circulation pump. The two-position four-way valve can switch flow direction within tens of milliseconds, meeting dynamic thermal management requirements; it is directly connected to the circulation pump outlet, simplifying piping layout and reducing pressure drop. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solution of this utility model and do not constitute a limitation on the technical solution of this utility model.

[0020] Figure 1 This is a schematic diagram showing the connection relationship of the cold plates provided in an embodiment of this application.

[0021] Figure 2 This is a schematic diagram of the structure of the cold plate provided in an embodiment of this application.

[0022] Figure 3 This is a schematic diagram of the lower cooling plate provided in an embodiment of this application.

[0023] Reference numerals: 1-Lower cold plate; 11-First interface; 12-Second interface; 13-Flow channel; 131-Main flow channel; 132-Outer flow channel; 133-Flow channel body; 134-Flow channel interface; 2-Electronic reversing valve; 21-Connecting pipe; 3-Vehicle BMS; 4-Upper cold plate. Detailed Implementation

[0024] 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, and 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.

[0025] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0026] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, when describing pipelines, the terms "connected" and "linked" as used in this application have the meaning of establishing electrical connection. The specific meaning needs to be understood in conjunction with the context.

[0028] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0029] As power batteries develop towards higher energy density and miniaturization, the heat generated by their cells has increased significantly, and cold plates are widely used as efficient heat dissipation components.

[0030] In existing technologies, the flow channel structure used for battery pack thermal management mostly adopts a U-shaped flow channel design. Under cooling conditions, the cell temperature in the area corresponding to the cold plate inlet is relatively low, while the cell temperature in the area corresponding to the cold plate outlet is relatively high; under heating conditions, the opposite temperature distribution characteristics are observed.

[0031] Differences in temperature distribution can lead to significant temperature differences between cells located near the inlet and outlet of the flow channel within the battery pack. These temperature differences exacerbate the inconsistent degradation of the cells, thereby shortening the overall lifespan of the battery pack.

[0032] Therefore, please refer to Figure 1 and Figure 2 This application provides a cold plate, including an upper cold plate 4, a lower cold plate 1, and an electronic reversing valve 2.

[0033] Please refer to Figure 2 The upper cooling plate 4 is used to bond the battery cells. The upper cooling plate 4 can be made of aluminum alloy, has a flat structure, and its thickness can be 2-5mm. Aluminum alloy has good thermal conductivity and processing properties, enabling it to quickly transfer the heat generated by the battery cells to the coolant. The upper surface of the upper cooling plate 4 is treated for flatness to ensure a tight bond with the battery cells and improve heat transfer efficiency. The battery cell refers to the battery cell of the power battery, which will not be described in detail here.

[0034] Please refer to Figure 2 The lower cold plate 1 is sealed and disposed on the lower side of the upper cold plate 4. The lower cold plate 1 is provided with a first interface 11 and a second interface 12 distributed at intervals on the plate surface opposite to the upper cold plate 4. Multiple flow channels 13 are formed in the lower cold plate 1, extending along the distribution direction of the first interface 11 and the second interface 12. Both ends of each flow channel 13 are connected to the first interface 11 and the second interface 12.

[0035] Please refer to Figure 2 The lower cooling plate 1 can be made of the same aluminum alloy as the upper cooling plate 4, and is fixedly connected to the upper cooling plate 4 by welding or bolting to form a closed cavity. The first interface 11 and the second interface 12 can be through openings. Both the first interface 11 and the second interface 12 can be made of copper to form corresponding tubular structures, which are fixedly connected to the lower cooling plate 1 by welding for connecting coolant pipelines.

[0036] The flow channel 13 inside the lower cold plate 1 can be formed on the upper surface of the lower cold plate 1 by machining or die casting, and together with the upper cold plate 4, they form a closed fluid channel.

[0037] Please refer to Figure 1 The electronic directional valve 2 is connected to the first interface 11 and the second interface 12 via connecting pipe 21, and is controlled by the vehicle BMS3. The electronic directional valve 2 adopts an electromagnetic drive method, which has a fast response speed and can complete the directional action in milliseconds.

[0038] The battery cell is equipped with multiple temperature sensors. The vehicle BMS3 can receive the detection information from the temperature sensors and control the electronic reversing valve 2 to switch the flow so that the coolant flows from the first port 11 through the flow channel 13 to the second port 12, or the coolant flows from the second port 12 through the flow channel 13 to the first port 11.

[0039] Please refer to Figure 1 and Figure 2 In this application, the upper cooling plate 4 is attached to the battery cell, and the lower cooling plate 1 has multiple flow channels 13 with their two ends connected to the first interface 11 and the second interface 12. The electronic reversing valve 2 controls the bidirectional flow of the coolant. By switching the flow direction through the electronic reversing valve 2, the coolant periodically changes its flow path, avoiding localized heat accumulation caused by long-term unidirectional flow. For example, when the temperature of a certain area of ​​the battery cell rises due to continuous heat absorption, reverse flow allows the low-temperature coolant to preferentially flow through that area, balancing the overall temperature.

[0040] The vehicle's BMS3 adjusts the flow direction in real time based on temperature sensor data to achieve precise temperature control. For example, during fast charging, heat is concentrated in the center of the battery cell, which can be cooled more effectively by reversing the flow direction; at low speeds, the edge cells are cooler, and forward flow can prioritize cooling the edges. By using coolant that can change the flow direction, continuous temperature differences in the power battery can be avoided, thus extending the battery's lifespan.

[0041] Please refer to Figure 1 In some examples, the two connecting pipes 21 of the electronic reversing valve 2, which connect the first interface 11 and the second interface 12, are two independently configured pipes. This avoids mutual interference between the fluids in the two connecting pipes 21, ensures stable flow during reversal, and prevents flow direction switching delays or uneven flow due to possible pressure fluctuations.

[0042] For example, the independent tube body can be made of high-pressure resistant rubber or metal corrugated pipe, thus possessing good flexibility and corrosion resistance, and being able to adapt to slight vibrations and displacements of the cold plate during operation.

[0043] Please refer to Figure 3 In some examples, the first interface 11 and the second interface 12 are distributed along the length of the lower cold plate 1, and the flow channel 13 is located between the first interface 11 and the second interface 12 along a distribution direction perpendicular to the first interface 11 and the second interface 12. The flow channel 13 extends along the direction of the interface connection, shortening the coolant flow path and reducing the pressure drop; the flow channel 13 is located between the interfaces, and the coolant is evenly distributed from the interfaces to each flow channel 13, avoiding insufficient flow in the edge flow channels 13.

[0044] Please refer to Figure 3In some examples, the flow channel 13 includes a main flow channel 131 and a plurality of outer flow channels 132. The main flow channel 131 extends in a straight line along the connection line between the first interface 11 and the second interface 12. The plurality of outer flow channels 132 are disposed outside the main flow channel 131. Along the distribution direction perpendicular to the first interface 11 and the second interface 12, the other flow channels 13 on both sides of the main flow channel 131 are symmetrically distributed about the connection line between the first interface 11 and the second interface 12.

[0045] Please refer to Figure 3 The main flow channel 131 has symmetrically distributed flow channels 13 on both sides, so that the coolant pressure is balanced when it is split, avoiding the concentration of flow on one side. The main flow channel 131 serves as a supporting frame, and the symmetrically distributed outer flow channels 132 enhance the overall rigidity of the cold plate and reduce deformation caused by thermal expansion.

[0046] Please refer to Figure 3 In some examples, the outer channel 132 includes a channel body 133 and channel interfaces 134 located at both ends of the channel body 133. The channel interfaces 134 communicate with the channel body 133 and extend in the direction of the first interface 11 or the second interface 12. The spacing between the first interface 11 or the second interface 12 and the ports of all channel interfaces 134 near the first interface 11 or the second interface 12 is similar or equal.

[0047] The flow channel interfaces 134 are evenly distributed, so that the flow resistance of the coolant from the interface to each flow channel 13 is consistent, avoiding excessive flow at the near end of the flow channel 13 and insufficient flow at the far end; the evenly distributed interfaces reduce local pressure changes, reduce stress concentration at the connection of the flow channels 13, and extend the life of the cold plate.

[0048] Please refer to Figure 3 In some examples, along the extension direction of the outer flow channel 132, the cross-sectional diameters of the flow channel interface 134 and the flow channel body 133 of the same outer flow channel 132 are close to or equal. Consistent cross-sectional diameters prevent turbulence at the interface due to sudden contraction or expansion, reducing energy loss; a stable flow velocity ensures full contact between the coolant and the inner wall of the cold plate, enhancing convective heat transfer.

[0049] Please refer to Figure 3 In some examples, along the distribution direction perpendicular to the first interface 11 and the second interface 12, the cross-sectional width of the main flow channel 131 is smaller than the cross-sectional width of the flow channel body 133. The narrower main flow channel 131 forces the coolant to flow preferentially to the outer flow channel 132, enhancing the heat dissipation of the edge cells; the main flow channel 131 is short and narrow, while the outer flow channel 132 is long and wide, thereby making the resistance of different flow channels 13 more similar and ensuring a balanced flow distribution in each flow channel 13.

[0050] Please refer to Figure 3In some examples, the cross-sectional width of the flow channel body 133 gradually increases along the direction away from the main flow channel 131. The increased width increases the cross-sectional area of ​​the outer flow channel 132, reduces the coolant flow velocity, prolongs the residence time, and improves the heat dissipation efficiency of the edge cells; the gradual width balances the pressure loss along the flow path, avoiding flow rate attenuation due to insufficient pressure in the far-end flow channel 13; the coolant travels a longer path in the outer flow channel 132 further away from the main flow channel 131, and increasing the width of the flow channel 13 can reduce resistance, which helps to make the coolant flow velocities in different flow channels 13 more similar.

[0051] In some examples, the electronic directional valve 2 is a two-position four-way solenoid directional valve, with its inlet connected to the outlet of the coolant circulation pump. This two-position four-way valve can switch flow direction within tens of milliseconds, meeting dynamic thermal management requirements; its direct connection to the circulation pump outlet simplifies piping layout and reduces pressure drop.

[0052] In some examples, since the length of the outer flow channel 132 gradually increases in the direction away from the main flow channel 131, multiple flow channel bodies 133 may share the same flow channel interface 134 for ease of arrangement. In this case, the flow channel interface 134 can be configured according to the number and layout of the flow channel bodies 133.

[0053] For example, flow channels 131, 23 and 33 can be configured on the same side of the main flow channel 131, and flow channels 131 and 23 share the same flow channel interface 134, while flow channel 3 uses an independent flow channel interface 134. At this time, a flow splitting structure can be configured accordingly, such as a tapered flow splitter or a flow splitting auxiliary structure with an angle.

[0054] This application provides an embodiment one, a cold plate, including an upper cold plate 4, a lower cold plate 1, and an electronic reversing valve 2.

[0055] The upper cooling plate 4 can be made of 6061 aluminum alloy, in the shape of a rectangular plate with a thickness of 3mm and a surface roughness of Ra0.8 to ensure a tight fit with the battery cell.

[0056] The lower cooling plate 1 can also be made of 6061 aluminum alloy and is sealed to the upper cooling plate 4 by friction stir welding. The lower cooling plate 1 is 300mm long, 200mm wide, and 5mm thick.

[0057] The lower cold plate 1 has a first interface 11 and a second interface 12 on its surface opposite to the upper cold plate 4. Both the first interface 11 and the second interface 12 are made of T2 copper, with an outer diameter of 12mm and a wall thickness of 1mm, and are distributed at intervals of 250mm along the length of the lower cold plate 1.

[0058] Five flow channels 13 can be formed within the lower cooling plate 1, with each flow channel 13 connected to a first interface 11 and a second interface 12 at both ends. The flow channels 13 are machined by CNC milling to a depth of 2mm. Among them, the main flow channel 131 extends in a straight line along the connection line between the first interface 11 and the second interface 12, with a cross-sectional width of 4mm. Two outer flow channels 132 are provided on each side of the main flow channel 131, symmetrically distributed about the main flow channel 131.

[0059] The outer flow channel 132 includes a flow channel body 133 and flow channel interfaces 134 located at both ends of the flow channel body 133. The flow channel interfaces 134 extend towards the first interface 11 or the second interface 12 with a length of 15 mm. The distance between the first interface 11 and the ports of all flow channel interfaces 134 near the first interface 11 is 10 mm, and the distance between the second interface 12 and the ports of all flow channel interfaces 134 near the second interface 12 is also 10 mm.

[0060] Along the extension direction of the outer flow channel 132, the cross-sectional diameter of both the flow channel interface 134 and the flow channel body 133 of the same outer flow channel 132 is 5 mm. Along the direction away from the main flow channel 131, the cross-sectional width of the flow channel body 133 gradually increases from 5 mm to 7 mm.

[0061] The electronic directional valve 2 is a two-position four-way solenoid directional valve, model 4WE6, which is connected to the first port 11 and the second port 12 via two independent connecting pipes 21. The connecting pipes 21 are made of high-pressure resistant rubber, with an inner diameter of 10mm and an outer diameter of 16mm. The inlet of the electronic directional valve 2 is connected to the outlet of the coolant circulation pump via a pipeline, and the control end is connected to the vehicle BMS3 via a wire.

[0062] Four temperature sensors are installed on the battery cell, located at the four corners of the cell. These sensors are connected to the vehicle's BMS3 via wires. When the vehicle's BMS3 detects that the temperature in a certain area of ​​the battery cell is too high, it controls the electronic reversing valve 2 to reverse the flow of coolant, allowing the coolant to flow preferentially through that area for more uniform heat dissipation.

[0063] This application provides a second embodiment of a cold plate, which includes an upper cold plate 4, a lower cold plate 1, and an electronic reversing valve 2.

[0064] The upper cold plate 4 is made of 5052 aluminum alloy, is a square flat plate with a thickness of 4mm, and the upper surface is anodized to improve surface hardness and corrosion resistance.

[0065] The lower cooling plate 1 is made of 5052 aluminum alloy and is sealed to the upper cooling plate 4 by bolts. A nitrile rubber sealing ring is installed between the two to ensure sealing performance. The lower cooling plate 1 has a side length of 250mm and a thickness of 6mm. The lower cooling plate 1 has a first interface 11 and a second interface 12 on the plate surface opposite to the upper cooling plate 4. Both the first interface 11 and the second interface 12 are made of H62 brass, with an outer diameter of 10mm and a wall thickness of 1mm, and are distributed at 200mm intervals along the length of the lower cooling plate 1.

[0066] The lower cold plate 1 has seven flow channels 13, each of which is connected to a first interface 11 and a second interface 12 at both ends. The flow channels 13 are formed by die casting and have a depth of 2.5 mm. The main flow channel 131 extends in a straight line along the connection line between the first interface 11 and the second interface 12, and has a cross-sectional width of 3 mm. Three outer flow channels 132 are provided on each side of the main flow channel 131, symmetrically distributed about the main flow channel 131.

[0067] The outer flow channel 132 includes a flow channel body 133 and flow channel interfaces 134 located at both ends of the flow channel body 133. The flow channel interfaces 134 extend towards the first interface 11 or the second interface 12, with a length of 20 mm. The spacing between the first interface 11 and the ports of all flow channel interfaces 134 near the first interface 11 is in the range of 8-12 mm, and the spacing between the second interface 12 and the ports of all flow channel interfaces 134 near the second interface 12 is also in the range of 8-12 mm.

[0068] Along the extension direction of the outer flow channel 132, the cross-sectional diameter of the flow channel interface 134 of the same outer flow channel 132 is 4 mm, and the cross-sectional diameter of the flow channel body 133 is 5 mm, with a difference of 1 mm. Along the direction away from the main flow channel 131, the cross-sectional width of the flow channel body 133 gradually increases from 5 mm to 8 mm.

[0069] The electronic directional valve 2 is a two-position four-way solenoid directional valve, model 4WE10, which is connected to the first port 11 and the second port 12 via two independent connecting pipes 21. The connecting pipes 21 are made of stainless steel bellows with an inner diameter of 8mm and an outer diameter of 14mm. The inlet end of the electronic directional valve 2 is connected to the outlet of the coolant circulation pump via a pipeline, and the control end is connected to the vehicle BMS3 via a wire.

[0070] The battery cell is equipped with six temperature sensors, which are installed at the center, four corners, and the midpoint of the edge of the cell. The temperature sensors are connected to the vehicle's BMS3 via wires. Based on the detection information from the temperature sensors, the vehicle's BMS3 controls the switching frequency and time of the electronic reversing valve 2 in real time, so that the time distribution of coolant in different flow directions matches the heat generation in different areas of the battery cell, achieving precise temperature control.

[0071] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0072] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A cold-rolled steel plate, characterized in that, include: Upper cold plate, used for bonding battery cells; The lower cold plate is sealed and disposed below the upper cold plate. The lower cold plate has a first interface and a second interface distributed at intervals on its surface away from the upper cold plate. Multiple flow channels are formed inside the lower cold plate, extending along the distribution direction of the first interface and the second interface. Both ends of each flow channel are connected to the first interface and the second interface. An electronic reversing valve is connected to the first interface and the second interface via connecting pipes. The electronic reversing valve is controlled and connected to the vehicle BMS. Multiple temperature sensors are configured on the battery cell. The vehicle BMS can receive the detection information from the temperature sensors and control the electronic reversing valve to switch directions, so that the coolant flows from the first interface through the flow channel to the second interface, or the coolant flows from the second interface through the flow channel to the first interface.

2. The cold-rolled plate according to claim 1, characterized in that, The two connecting pipes that connect the first interface and the second interface of the electronic reversing valve are two independently configured pipe bodies.

3. The cold-rolled plate according to claim 1, characterized in that, The first interface and the second interface are distributed along the length of the lower cold plate, and the flow channel is located between the first interface and the second interface along a distribution direction perpendicular to the first interface and the second interface.

4. The cold-rolled plate according to any one of claims 1 to 3, characterized in that, The flow channel includes a main flow channel and multiple outer flow channels. The main flow channel extends in a straight line along the connection line between the first interface and the second interface. The multiple outer flow channels are disposed outside the main flow channel and distributed in a direction perpendicular to the first interface and the second interface. The other flow channels on both sides of the main flow channel are symmetrically distributed about the connection line between the first interface and the second interface.

5. The cold-rolled plate according to claim 4, characterized in that, The outer flow channel includes a flow channel body and flow channel interfaces located at both ends of the flow channel body. The flow channel interfaces connect to the flow channel body and extend in the direction of the first interface or the second interface. The distance between the first interface or the second interface and the ports of all the flow channel interfaces close to the first interface or the second interface is similar or equal.

6. The cold-rolled plate according to claim 5, characterized in that, Along the extension direction of the outer flow channel, the cross-sectional diameters of the flow channel interface and the flow channel body of the same outer flow channel are close to or equal.

7. The cold-rolled plate according to claim 5, characterized in that, Along the distribution direction perpendicular to the first interface and the second interface, the cross-sectional width of the main channel is smaller than the cross-sectional width of the channel body.

8. The cold-rolled plate according to claim 7, characterized in that, Along the direction away from the main flow channel, the cross-sectional width of the main flow channel gradually increases.

9. The cold-rolled plate according to claim 1, characterized in that, The electronic directional valve is a two-position four-way solenoid directional valve, and the inlet end of the electronic directional valve is connected to the outlet of the coolant circulation pump.

Images