A liquid cooling plate, a battery assembly and a vehicle

Abstract

The present invention provides a liquid cooling plate, a battery assembly and a vehicle. Among them, a liquid cooling plate includes: a first cover plate, a second cover plate, a plurality of grooves and a plurality of flow channel units. The first cover plate and the second cover plate are connected to form a hollow cavity. A plurality of the flow channel units are located in the hollow cavity, and a plurality of the flow channel units communicate to form a heat exchange flow path. A fluid can flow in the heat exchange flow path. A plurality of the grooves are arranged on the first cover plate or the second cover plate. The grooves can wrap the product tab. The grooves are opposite to the heat exchange flow path. The heat exchange flow path can directly or indirectly exchange heat with the product tab. It can overcome the defect that in the prior art, the cold plate is located below the battery, and the tab part is prone to overheating.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to a liquid cooling plate, a battery assembly, and a vehicle. Background Art

[0002] The working performance of the power battery of an electric vehicle is severely affected by temperature. To ensure the working performance of the power battery, it is required that the battery be in an appropriate temperature. The current ambient temperature at which the power battery operates is -30°C to 55°C, while the ideal working temperature of the battery is between 10°C and 40°C. Traditional natural cooling and forced air cooling cannot meet its usage conditions and requirements. To apply liquid cooling technology, the liquid cooling plate is the most common method currently used in liquid cooling technology. The battery is mainly composed of three parts: the tab, the housing, and the central region, and the heat sources of lithium batteries are mainly concentrated on the positive and negative tabs. In the design of traditional liquid cooling plates, the cold plate is mostly located at the lower part of the battery, and the cooling of the battery cells is relatively sufficient, but the tab part is prone to overheating, affecting the temperature uniformity of the battery. Summary of the Invention

[0003] Therefore, the present invention provides a liquid cooling plate, a battery assembly, and a vehicle, which can overcome the defect that the cold plate in the prior art is located at the lower part of the battery and the tab part is prone to overheating.

[0004] To solve the above problems, the present invention provides a liquid cooling plate, which includes: a first cover plate, a second cover plate, a plurality of grooves, and a plurality of flow channel units. The first cover plate and the second cover plate are connected to form a hollow cavity. A plurality of the flow channel units are located in the hollow cavity, and a plurality of the flow channel units communicate to form a heat exchange flow path. A fluid can flow in the heat exchange flow path. A plurality of the grooves are provided on the first cover plate or the second cover plate. The grooves can wrap the product tabs. The grooves are opposite to the heat exchange flow path, and the heat exchange flow path can directly or indirectly exchange heat with the product tabs.

[0005] In some embodiments, the flow channel unit includes a first flow channel, a third flow channel, a fourth flow channel, and a sixth flow channel. An inlet is provided on the first flow channel, and the inlet can introduce a fluid. An outlet is provided on the fourth flow channel, and the outlet can discharge the fluid. The first end of the first flow channel is connected to the third end of the fourth flow channel through the sixth flow channel, and the second end of the first flow channel is connected to the fourth end of the fourth flow channel through the third flow channel;

[0006] The groove is provided on the second cover plate, and the flow channel unit is provided on the first cover plate; and the groove is provided at a position on the second cover plate opposite to the first flow channel; the groove is provided at a position on the second cover plate opposite to the first flow channel; and the groove is provided at a position on the second cover plate opposite to the fourth flow channel; the groove is provided at a position on the second cover plate opposite to the fourth flow channel.

[0007] In some embodiments, the flow channel unit further includes a second flow channel and a fifth flow channel. The first end of the first flow channel is communicated with the fourth end of the fourth flow channel through the second flow channel, and the second end of the first flow channel is communicated with the third end of the fourth flow channel through the fifth flow channel. The second flow channel and the fifth flow channel intersect and are communicated with each other, and the groove is provided at a position on the second cover plate opposite to the intersection position;

[0008] The groove is provided at a position on the second cover plate opposite to the first end of the first flow channel; the groove is provided at a position on the second cover plate opposite to the second end of the first flow channel; and the groove is provided at a position on the second cover plate opposite to the third end of the fourth flow channel; the groove is provided at a position on the second cover plate opposite to the fourth end of the fourth flow channel.

[0009] In some embodiments, the width of the first flow channel and the width of the second flow channel do not exceed the width of the groove, and the sandwich thickness between the groove and the heat exchange flow path is not greater than one-half of the thickness of the liquid cooling plate.

[0010] In some embodiments, along the direction perpendicular to the first cover plate, the cross-sections of the first flow channel and the second flow channel are polygonal.

[0011] In some embodiments, one end of the heat exchange flow path is provided with a liquid inlet pipe, and the other end is provided with a liquid outlet pipe, and the liquid inlet pipe and the liquid outlet pipe can extend out of the hollow cavity.

[0012] The present invention further provides a battery assembly, including a plurality of battery bodies, and the battery body has at least one product tab, and the liquid cooling plate described in the previous item is provided on the product tab.

[0013] In some embodiments, the groove is matched with the product tab, and the distance between two adjacent grooves is equal to the distance between two product tabs.

[0014] In some embodiments, the groove can wrap the product tab, and the surface of the first cover plate or the second cover plate can be attached to the surface of the battery.

[0015] The present invention also provides an electric motor, which includes the battery assembly described in any one of the preceding items.

[0016] A liquid cooling plate, a battery assembly and a vehicle provided by the present invention. The first cover plate and the second cover plate are connected to form a hollow cavity. A plurality of the flow channel units are all located in the hollow cavity. The plurality of the flow channel units are connected in series to form a heat exchange flow path. The groove is opposite to the heat exchange flow path. The product tab is wrapped through the groove. The heat exchange flow path can directly or indirectly exchange heat with the product tab, ensuring that the product tab part is fully cooled, reducing the overall temperature of the battery, and ensuring the heat exchange effect. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the liquid cooling plate according to an embodiment of the present invention;

[0018] Figure 2 is a cross-sectional view of the liquid cooling plate according to an embodiment of the present invention;

[0019] Figure 3 is a schematic structural diagram of the first cover plate in the liquid cooling plate according to an embodiment of the present invention;

[0020] Figure 4 is a schematic structural diagram of the flow channel unit in the liquid cooling plate according to an embodiment of the present invention;

[0021] Figure 5 is a schematic structural diagram of the second cover plate in the liquid cooling plate according to an embodiment of the present invention;

[0022] Figure 6 is an assembly diagram of the liquid cooling plate and the battery according to an embodiment of the present invention;

[0023] Figure 7 is a schematic structural diagram of the battery in the battery assembly according to another embodiment of the present invention.

[0024] The reference numerals are shown as:

[0025] 1. First cover plate; 2. Second cover plate; 3. Flow channel unit; 4. Groove; 5. Liquid inlet pipe; 6. Liquid outlet pipe; 7. Battery; 8. Product tab; 9. First flow channel; 10. Second flow channel; 11. Third flow channel; 12. Fourth flow channel; 13. Fifth flow channel; 14. Sixth flow channel. Detailed Embodiments

[0026] With reference to Figures 1-7As shown in the figure, according to an embodiment of the present invention, a liquid cooling plate is provided, including: a first cover plate 1, a second cover plate 2, a plurality of grooves 4 and a plurality of flow channel units 3. The first cover plate 1 and the second cover plate 2 are connected to form a hollow cavity. A plurality of the flow channel units 3 are located in the hollow cavity, and a plurality of the flow channel units 3 communicate to form a heat exchange flow path. A fluid can flow in the heat exchange flow path. A plurality of the grooves 4 are arranged on the first cover plate 1 or the second cover plate 2. The grooves 4 can wrap the product tab. The grooves 4 are opposite to the heat exchange flow path, and the heat exchange flow path can directly or indirectly exchange heat with the product tab. In this technical solution, the product tab is a battery tab. The heat exchange flow path can be formed by arranging a flow channel in the hollow cavity, or by fixing a plurality of baffles on the first cover plate 1 or the second cover plate 2. The baffles are opposite to each other in pairs, so that a flow channel is formed between two baffles, and then the top surface of the flow channel is sealed by the first cover plate 1 or the second cover plate 2 to form a heat exchange flow channel. The first cover plate 1 and the second cover plate 2 are connected to form a hollow cavity. A plurality of the flow channel units 3 are all located in the hollow cavity. A plurality of the flow channel units 3 are connected in series to form a heat exchange flow path. The grooves 4 are opposite to the heat exchange flow path. The product tab is wrapped by the grooves 4, and the grooves 4 are heated by the heat exchange flow path, so as to cool the product tab, ensure that the tab part is fully cooled, reduce the overall temperature of the battery, and also enable the product tab and the upper surface of the product to be in contact with the liquid cooling plate, increase the heat exchange area, realize the cooling of the tab part and the middle part of the battery, ensure the heat exchange effect, and reduce the temperature difference between batteries. Preferably, taking 9 product tabs 8 as a group, see Figure 5 As shown in the figure, along the width direction of the second cover plate 2, 6 grooves 4 are arranged on the second cover plate 2. Two adjacent grooves 4 are a group, and the distance between two adjacent groups of grooves 4 is equal. Along the length direction of the second cover plate 2, 3n grooves 4 are arranged on the second cover plate 2, where n is a constant, and the distance between two adjacent grooves 4 is equal. See Figure 4 As shown in the figure, the flow channels of each flow channel unit are arranged horizontally, vertically and obliquely. The product tabs 8 of the battery are distributed at the positions where the flow channels and the flow channels intersect, ensuring the full cooling of the product tabs 8. See Figure 4 As shown in the figure, the structure of each flow channel unit is exactly the same. The horizontal and vertical flow channels are used to connect each flow channel unit in series to form a passage. The liquid inlet pipe 5 and the liquid outlet pipe 6 are arranged on the side of the liquid cooling plate. To improve the cooling efficiency of the liquid cooling plate, the width of the flow channel cross-section should not exceed the size of the electrode. See Figure 6 As shown in the figure, on the side of the second cover plate of the liquid cooling plate in contact with the battery, grooves 4 are provided and are in contact with the battery 7. The grooves 4 partially overlap with the product tabs 8, so that the grooves 4 can completely wrap the product tabs 8. The non-groove 4 part is in contact with the upper surface of the power battery 7. The side of the second cover plate with grooves 4 can be completely attached to the battery tab part and the upper surface of the battery 7.

[0027] In a specific embodiment, the flow channel unit 3 includes a first flow channel 9, a third flow channel 11, a fourth flow channel 12, and a sixth flow channel 14. An inlet is provided on the first flow channel 9, and the inlet can admit fluid. An outlet is provided on the fourth flow channel 12, and the outlet can discharge fluid. The first end of the first flow channel 9 is communicated with the third end of the fourth flow channel 12 through the sixth flow channel 14, and the second end of the first flow channel 9 is communicated with the fourth end of the fourth flow channel 12 through the third flow channel 11;

[0028] The groove is provided on the second cover plate 2, and the flow channel unit 3 is provided on the first cover plate 1; and the groove 4 is provided at a position on the second cover plate 2 opposite to the first flow channel 9; the groove 4 is provided at a position on the second cover plate 2 opposite to the first flow channel 9; and the groove 4 is provided at a position on the second cover plate 2 opposite to the fourth flow channel 12; the groove 4 is provided at a position on the second cover plate 2 opposite to the fourth flow channel 12. Specifically, the flow channel unit 3 further includes a second flow channel 10 and a fifth flow channel 13. The first end of the first flow channel 9 is communicated with the fourth end of the fourth flow channel 12 through the second flow channel 10, and the second end of the first flow channel 9 is communicated with the third end of the fourth flow channel 12 through the fifth flow channel 13. The second flow channel 10 and the fifth flow channel 13 intersect and communicate with each other, and the groove 4 is provided at a position on the second cover plate 2 opposite to the intersection position;

[0029] The groove 4 is provided at a position on the second cover plate 2 opposite to the first end of the first flow channel 9; the groove 4 is provided at a position on the second cover plate 2 opposite to the second end of the first flow channel 9; and the groove 4 is provided at a position on the second cover plate 2 opposite to the third end of the fourth flow channel 12; the groove 4 is provided at a position on the second cover plate 2 opposite to the fourth end of the fourth flow channel 12.

[0030] In this technical solution, as shown in Figure 3 shown, the shape of the flow channel unit can be a quadrilateral or other types of polygons. On the premise of ensuring the heat exchange effect of the product ear electrode, the groove 4 is provided opposite to the intersection point of the second flow channel 10 and the fifth flow channel 13 to increase the disturbance of the coolant, improve the convective heat transfer coefficient, and enhance the heat exchange effect.

[0031] In a specific embodiment, the widths of the first flow channel 9 and the second flow channel 10 do not exceed the width of the groove 4, and the thickness of the interlayer between the groove 4 and the heat exchange flow path is not greater than one-half of the thickness of the liquid cooling plate. In this technical solution, the heat exchange capabilities of the first flow channel 9 and the second flow channel 10 are ensured. If the cross-sectional width is too wide, the greater the coolant flow rate, and the heat transfer coefficient will decrease, which will weaken the heat exchange ability and reduce the heat transfer resistance between the product tab and the coolant.

[0032] In a specific embodiment, along the direction perpendicular to the first cover plate 1, the cross-sections of the first flow channel 9 and the second flow channel 10 are polygonal. In this technical solution, the cross-sections of the first flow channel 9 and the second flow channel 10 are polygonal, which increases the heat exchange area between the first flow channel 9, the second flow channel 10 and the groove, and improves the heat exchange effect.

[0033] In a specific embodiment, a liquid inlet pipe 5 is provided at one end of the heat exchange flow path, and a liquid outlet pipe 6 is provided at the other end. The liquid inlet pipe 5 and the liquid outlet pipe 6 can extend out of the hollow cavity. In this technical solution, the two ends of the heat exchange flow path can be located at the two ends of the first cover plate 1 or the second cover plate 2 respectively, or can be located at the same end of the first cover plate 1 or the second cover plate 2. Through the liquid inlet pipe 5 and the liquid outlet pipe 6, the coolant is transported into and discharged from the heat exchange flow path. The coolant flows into the first flow channel unit 3 of the liquid cooling plate through the liquid inlet pipe 5, and flows along the horizontal, vertical and diagonal first flow channels 9 and second flow channels 10. A groove 4 is provided on one side of the cold plate, so that the product tab 8 is closely attached to the groove 4 of the liquid cooling plate and is distributed along the coolant flow path, reducing the heat transfer resistance between the product tab 8 and the coolant, and ensuring that the product tab 8 part is fully cooled. The flow channels are arranged horizontally, vertically and obliquely, increasing the disturbance of the coolant and improving the convective heat transfer coefficient, enhancing the heat exchange effect. In addition, one side of the cold plate is a groove 4, and its flat part is attached to the upper surface of the battery 7, which can also cool the central part of the battery, reduce the temperature difference between the batteries, improve the battery temperature uniformity, and ensure the charge and discharge performance of the battery. The coolant converges and flows out of one flow channel unit and then flows into the next flow channel unit, and so on, until it flows out of all the flow channel units and then flows out of the liquid cooling plate through the coolant outlet pipe.

[0034] Combined with reference to Figure 6 and Figure 7 As shown, the present invention also provides a battery assembly including a plurality of batteries 7, each of the batteries 7 having at least one product tab 8, and a liquid cooling plate is provided on the product tab 8. In this technical solution, a battery assembly capable of cooling the product tab 8 of the battery 7 is provided.

[0035] In a specific embodiment, the groove 4 matches the product tab 8, and the distance between two adjacent grooves 4 is equal to the distance between two product tabs 8. In this technical solution, the groove 4 matches the product tab 8, and the distance between two adjacent grooves 4 is equal to the distance between two product tabs 8, so that the liquid cooling plate can exchange heat for all the product tabs 8 of the battery assembly.

[0036] In a specific embodiment, the groove 4 can wrap the product tab 8, and the surface of the first cover plate 1 or the second cover plate 2 can be attached to the surface of the battery 7. In this technical solution, cooling of the part of the product tab 8 and the middle part of the battery 7 is achieved, ensuring the heat exchange effect and reducing the temperature difference between the batteries.

[0037] The present invention also provides a vehicle, which is characterized by including the above-mentioned battery assembly.

[0038] The foregoing are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention. The foregoing is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A liquid cooling plate, characterized in that: Comprising: A first cover plate (1), a second cover plate (2), a plurality of grooves (4) and a plurality of flow channel units (3), wherein the first cover plate (1) and the second cover plate (2) are connected to form a hollow cavity, the plurality of flow channel units (3) are located in the hollow cavity, and the plurality of flow channel units (3) communicate to form a heat exchange flow path through which a fluid can flow. The plurality of grooves (4) are provided on the first cover plate (1) or the second cover plate (2), the grooves (4) can wrap the product tab, the grooves (4) are opposite to the heat exchange flow path, and the heat exchange flow path can directly or indirectly exchange heat with the product tab; The flow channel unit (3) includes a first flow channel (9), a third flow channel (11), a fourth flow channel (12) and a sixth flow channel (14). An inlet is provided on the first flow channel (9), and the inlet can introduce a fluid. An outlet is provided on the fourth flow channel (12), and the outlet can discharge a fluid. The first end of the first flow channel (9) is communicated with the third end of the fourth flow channel (12) through the sixth flow channel (14), and the second end of the first flow channel (9) is communicated with the fourth end of the fourth flow channel (12) through the third flow channel (11); The groove is provided on the second cover plate (2), and the flow channel unit (3) is provided on the first cover plate (1); and the groove (4) is provided at a position on the second cover plate (2) opposite to the first flow channel (9); the groove (4) is provided at a position on the second cover plate (2) opposite to the first flow channel (9); and the groove (4) is provided at a position on the second cover plate (2) opposite to the fourth flow channel (12); the groove (4) is provided at a position on the second cover plate (2) opposite to the fourth flow channel (12).

2. The liquid cooling plate according to claim 1, wherein: The flow channel unit (3) further includes a second flow channel (10) and a fifth flow channel (13). The first end of the first flow channel (9) is communicated with the fourth end of the fourth flow channel (12) through the second flow channel (10), and the second end of the first flow channel (9) is communicated with the third end of the fourth flow channel (12) through the fifth flow channel (13). The second flow channel (10) and the fifth flow channel (13) intersect and communicate with each other, and the groove (4) is provided at a position on the second cover plate (2) opposite to the intersection; The groove (4) is provided at a position on the second cover plate (2) opposite to the first end of the first flow channel (9); the groove (4) is provided at a position on the second cover plate (2) opposite to the second end of the first flow channel (9); and the groove (4) is provided at a position on the second cover plate (2) opposite to the third end of the fourth flow channel (12); the groove (4) is provided at a position on the second cover plate (2) opposite to the fourth end of the fourth flow channel (12).

3. The liquid cooling plate according to claim 2, wherein: The widths of the first flow channel (9) and the second flow channel (10) do not exceed the width of the groove (4), and the thickness of the interlayer between the groove (4) and the heat exchange flow path is not greater than one-half of the thickness of the liquid cooling plate.

4. The liquid cooling plate according to claim 2, characterized in that: In a direction perpendicular to the first cover plate (1), the cross-sections of the first flow channel (9) and the second flow channel (10) are polygonal.

5. The liquid cooling plate according to claim 1, wherein: One end of the heat exchange flow path is provided with a liquid inlet pipe (5), and the other end is provided with a liquid outlet pipe (6), and the liquid inlet pipe (5) and the liquid outlet pipe (6) can extend out of the hollow cavity.

6. A battery assembly, characterized in that, It includes a plurality of batteries (7), the batteries (7) have at least one product tab (8), and the liquid cooling plate according to any one of claims 1-5 is provided on the product tab (8).

7. The battery assembly according to claim 6, wherein The groove (4) matches the product tab (8), and the distance between two adjacent grooves (4) is equal to the distance between two product tabs (8).

8. The battery assembly according to claim 6, wherein, The groove (4) can wrap the product tab (8), and the surface of the first cover plate (1) or the second cover plate (2) can be attached to the surface of the battery (7).

9. A vehicle, characterized in that, It includes a battery assembly according to any one of claims 6-8.

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