Liquid cooling plate suitable for high-energy and high-density battery cell

Abstract

The invention discloses a liquid cooling plate suitable for a high-energy high-density battery cell, the liquid cooling plate comprises a flow channel plate, one side of the flow channel plate is provided with a liquid inlet hole and a liquid outlet hole, a plurality of cooling sections are sequentially arranged in the direction from the liquid inlet hole to the liquid outlet hole, the liquid inlet hole is respectively connected with a head end cooling section and a middle cooling section through a shunt branch pipe, and the shunt branch pipe is connected with the middle cooling section. The liquid inlet end of the tail end cooling section is connected with the liquid outlet end of the head end cooling section and the liquid outlet end of the middle cooling section, a U-shaped pipe is arranged between the tail end cooling section and the middle cooling section, and the flow dividing branch pipe is connected with the liquid outlet end of the tail end cooling section through the U-shaped pipe. And a step-shaped turbulent flow plate is arranged between the cooling pipelines at the liquid outlet end of the middle cooling section. Compared with the prior art, the liquid cooling plate has the advantages that the plurality of shunting branch pipes are arranged at the liquid inlet hole, the turbulent flow plate is arranged at the liquid outlet end of the middle cooling section, and the U-shaped pipe is arranged between the tail end cooling section and the middle cooling section, so that the overall temperature difference of the liquid cooling plate can be reduced through the cooperation of the three aspects.

Description

Technical Field

[0001] This invention relates to the field of liquid cooling technology for battery cells, and in particular to a liquid cooling plate suitable for high-energy, high-density battery cells. Background Technology

[0002] With the iterative upgrades of battery cell products, 587Ah capacity cells will gradually replace 314Ah cells, reducing costs and increasing efficiency through improved energy density and optimized system integration. This is a result of technological development, market demand, and economic considerations. At the same discharge rate, the total heat generation of a 587Ah cell is more than twice that of a 314Ah cell, requiring a more powerful cooling system to dissipate heat promptly; otherwise, localized overheating can easily occur, affecting lifespan and safety. In terms of weight, a 587Ah cell is significantly heavier than a 314Ah cell, almost twice as heavy. Since the thickness of liquid cooling plates is mostly 1 to 1.5mm, the liquid cooling plates need to have excellent pressure resistance while incorporating cooling channels. Summary of the Invention

[0003] This invention provides a liquid cooling plate suitable for high-energy, high-density battery cells to solve the technical problem of heat dissipation in 587Ah capacity battery cells.

[0004] This invention provides a liquid cooling plate suitable for high-energy, high-density battery cells, comprising a flow channel plate. One side of the flow channel plate has an inlet and an outlet. Multiple cooling sections are sequentially arranged from the inlet to the outlet. Each cooling section includes a first-end cooling section, a last-end cooling section, and multiple intermediate cooling sections disposed between the first-end and last-end cooling sections. The inlet is connected to the first-end and intermediate cooling sections via branch pipes. The inlet end of the last-end cooling section is connected to the outlet end of both the first-end and intermediate cooling sections. A U-shaped pipe is provided between the last-end and intermediate cooling sections. The branch pipes of the flow channel plate are connected to the outlet end of the last-end cooling section via the U-shaped pipe. The transverse cooling pipes on the intermediate cooling sections gradually increase along the coolant flow direction. Multiple longitudinal cooling pipes are provided between the transverse cooling pipes at the outlet end of the intermediate cooling section. A stepped turbulence plate is provided between the cooling pipes at the outlet end of the intermediate cooling section.

[0005] Preferably, the liquid inlet is connected to the first end cooling section through a first branch pipe, the liquid inlet is connected to multiple middle cooling sections through a third branch pipe, the third branch pipe is connected to the first end cooling section, a second branch pipe is connected on the pipe from the liquid inlet to the third branch pipe, and multiple connecting pipes are provided between the second branch pipe and the third branch pipe.

[0006] Preferably, the first branch pipe is inclinedly distributed between the first cooling section and the liquid inlet, and the lower end of the first branch pipe is connected to the liquid inlet.

[0007] Preferably, the flow channel plate has multiple support protrusions at one end near the liquid inlet hole. The support protrusions are located on the upper and lower sides of the first cooling section, and also on the upper and lower sides of the middle cooling section.

[0008] Preferably, the liquid outlet end of the first cooling section is provided with a first step, the support protrusion extends to the first step, the middle part of the first cooling section is provided with a second step, the support protrusion extends to the second step, and the first step and the second step are respectively provided on both sides of the first cooling section.

[0009] Preferably, the upper side of the middle cooling section at the beginning end is provided with a third step and a fourth step, the support protrusion extends to the fourth step, the support protrusion extending to the fourth step is provided with a fifth step that cooperates with the third step, the lower side of the middle cooling section at the beginning end is provided with a sixth step, the support protrusion extends to the sixth step, and the third step is located between the fourth step and the branch pipe.

[0010] Preferably, the upper and lower sides of the middle cooling section at the end are provided with a seventh step and an eighth step, respectively. One of the supporting protrusions extends to the seventh step, and the other supporting protrusion extends to the eighth step. The seventh step is located between the eighth step and the branch pipe.

[0011] Preferably, the liquid outlet of the first cooling section is connected to the liquid outlet of the middle cooling section through a first liquid outlet pipe, the first liquid outlet pipe is connected to the liquid inlet of the end cooling section, the first liquid outlet pipe is connected to a second liquid outlet pipe through multiple connecting pipes, and the two ends of the second liquid outlet pipe are flush with the two ends of the first liquid outlet pipe.

[0012] Preferably, multiple connecting pipes are provided between the liquid outlet of the first cooling section and the liquid outlet of the middle cooling section, and connecting pipes are provided between the liquid outlets of two adjacent middle cooling sections, and connecting pipes are provided between the liquid outlets of the middle cooling section and the liquid outlet of the last cooling section.

[0013] Preferably, the end cooling section is provided with a mixing pipe, which is connected to the first liquid outlet pipe through multiple transverse cooling pipes, and the mixing pipe is connected to the liquid outlet hole through multiple drain pipes. The U-shaped pipe is connected to the mixing pipe, and the number of transverse cooling pipes on the end cooling section is greater than the number of drain pipes. The support protrusion is located between the second branch pipe and the drain pipe.

[0014] Compared with existing technologies, this invention features multiple branch pipes at the inlet, which facilitates coolant dispersion and rapid flow into the initial cooling section and each intermediate cooling section. This reduces the flow resistance of the liquid cooling plate and helps control the temperature difference between the initial and intermediate cooling sections. Secondly, a turbulence plate is installed at the outlet of the intermediate cooling section to increase turbulence and prevent excessively high local temperatures in this area. The change in the flow channel affects the overall coolant flow velocity within the channel, causing the minimum temperature of the liquid cooling plate to rise, further facilitating the control of the temperature difference between the initial and intermediate cooling sections. Thirdly, the U-shaped pipe directly introduces coolant from the inlet through the branch pipes, and the low-temperature coolant in the U-shaped pipe neutralizes the high-temperature coolant in the final cooling section, thereby controlling the temperature difference between the final and intermediate cooling sections. The combination of these three features helps reduce the overall temperature difference of the liquid cooling plate. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the flow channel plate of the present invention; Figure 3 This is a schematic diagram of the structure of the support protrusion of the present invention; Figure 4 This is a schematic diagram of the liquid cooling plate of the present invention without a turbulence plate; Figure 5 for Figure 4 Temperature distribution on the battery surface in a simulation experiment using a liquid cooling plate; Figure 6 This is a battery surface temperature distribution diagram from the liquid cooling plate simulation experiment of the present invention; Figure 7 This is a flow resistance distribution diagram from the simulation experiment of the liquid cooling plate of the present invention; Figure 8 for Figure 4 Flow resistance distribution diagram from the simulation experiment of the liquid cooling plate; Figure 9 This is a load-bearing deformation distribution diagram from the simulation experiment of the liquid-cooled plate of the present invention.

[0017] Figure label: 100. Flow channel plate, 1. Liquid inlet, 2. Liquid outlet, 3. First cooling section, 4. Middle cooling section, 5. End cooling section, 6. Branch pipe, 7. U-shaped pipe, 8. Cooling pipe, 9. Turbulence plate, 10. Connecting pipe, 11. Support protrusion, 12. First step, 13. Second step, 14. Third step, 15. Fourth step, 16. Fifth step, 17. Sixth step, 18. Seventh step, 19. Eighth step, 20. First groove, 21. First liquid outlet pipe, 22. Second liquid outlet pipe, 23. Mixing pipe, 24. Drain pipe, 25. Battery cell, 26. Cover plate. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0019] See attached document Figure 1 and attached Figure 2A liquid cooling plate suitable for high-energy, high-density battery cells 25 includes a flow channel plate 100, with a cover plate 26 fixed to the upper end of the flow channel plate 100. One side of the flow channel plate 100 has an inlet hole 1 and an outlet hole 2, both of which penetrate the cover plate 26. Multiple cooling sections are sequentially arranged from the inlet hole 1 to the outlet hole 2. Each cooling section is used to cool one row of battery cells 25. The cooling sections include a first-end cooling section 3, a last-end cooling section 5, and multiple middle cooling sections 4 disposed between the first-end cooling section 3 and the last-end cooling section 5. In this embodiment, there are two middle cooling sections 4, meaning the liquid cooling plate cools a total of four rows of battery cells 25. The inlet hole 1 is connected to the first-end cooling section 3 and the middle cooling section 4 respectively via a branch pipe 6. The inlet end of the last cooling section 5 is connected to the outlet end of the first-end cooling section 3 and the outlet end of the middle cooling section 4 respectively. A U-shaped pipe 7 is provided between the middle cooling section 4 and the flow channel plate 100. The branch pipes 6 of the flow channel plate 100 are connected to the liquid outlet end of the end cooling section 5 through the U-shaped pipe 7. The bend of the U-shaped pipe 7 extends to the liquid inlet end of the end cooling section 5. The transverse cooling pipes 8 on the middle cooling section 4 gradually increase along the coolant flow direction. This arrangement helps to increase the distribution area of ​​the cooling pipes 8 and reduce the temperature in this area. At the liquid outlet end of the middle cooling section 4, multiple longitudinal cooling pipes 8 are provided between the transverse cooling pipes 8. This arrangement further increases the distribution area of ​​the cooling pipes 8 at the liquid outlet end of the middle cooling section 4 and reduces the temperature in this area. The middle cooling section 4 has a stepped turbulence plate 9 between the cooling pipes 8 at its liquid outlet end. In this invention, multiple branch pipes 6 are provided at the liquid inlet 1, which helps to disperse and quickly flow the coolant into the first cooling section 3 and each of the middle cooling sections 4, which helps to reduce the flow resistance of the liquid cooling plate and helps to control the temperature difference between the first cooling section 3 and the middle cooling section 4. Secondly, a turbulence plate 9 is installed at the liquid outlet of the middle cooling section 4 to increase turbulence and prevent excessively high local temperatures in this area. This further facilitates the control of the temperature difference between the first cooling section 3 and the middle cooling section 4. (See attached diagram.) Figure 4 and attached Figure 5 Without the coolant being turbulent by the turbulence plate 9, under the conditions of an inlet flow rate of 10 L / min and an inlet temperature of 25℃, the maximum temperature at the outlet of the middle cooling section 4 is 43.37℃. (Refer to Appendix) Figure 6By designing turbulence plates 9 between cooling pipes 8 to turbulent the coolant, the maximum temperature at the outlet of the middle cooling section 4 is reduced by 0.2℃ to 43.17℃ under the conditions of an inlet flow rate of 10L / min and an inlet temperature of 25℃. Furthermore, adjusting the flow channel with turbulence plates 9 affects the flow rate and local temperature of the coolant throughout the liquid cooling plate. The lowest temperature of the liquid cooling plate of this invention is 40.87℃, which is higher than the lowest temperature of 40.94℃ for a liquid cooling plate without turbulence plates 9, further reducing the overall temperature difference. The surface temperature difference of the liquid cooling plate designed in this invention is 2.23℃, which is less than 3℃, meeting the heat dissipation requirements of a 587Ah capacity battery cell. Third, the coolant flowing into the liquid inlet of the end cooling section 5 has already absorbed the heat of a row of battery cells 25. If another row of battery cells 25 is cooled, the temperature difference between the end cooling section 5 and the middle cooling section 4 will increase. The U-shaped tube 7 directly introduces the coolant from the liquid inlet 1 through the branch pipe 6. Then, the low-temperature coolant of the U-shaped tube 7 neutralizes the high-temperature coolant of the end cooling section 5, thereby controlling the temperature difference between the end cooling section 5 and the middle cooling section 4. The combination of these three factors helps to reduce the overall temperature difference of the liquid cooling plate.

[0020] In another embodiment of the present invention: the liquid inlet 1 is connected to the first cooling section 3 via a first branch pipe 6, and the liquid inlet 1 is connected to multiple middle cooling sections 4 via a third branch pipe 6. The third branch pipe 6 is connected to the first cooling section 3, and a second branch pipe 6 is connected to the pipeline from the liquid inlet 1 to the third branch pipe 6. Multiple connecting pipes 10 are provided between the second branch pipe 6 and the third branch pipe 6. In this structural design, the coolant from the liquid inlet 1 flows into the first cooling section 3 via the first branch pipe 6, or it can flow into the first cooling section 3 via the third branch pipe 6. The coolant from the liquid inlet 1 flows directly into the middle cooling section 4 via the third branch pipe 6, or it can flow into the middle cooling section 4 via the second branch pipe 6, the connecting pipe 10, and the third branch pipe 6. Both the first cooling section 3 and the middle cooling section 4 are provided with multiple liquid inlet pipes. This structural design facilitates the rapid dispersion of coolant into the first cooling section 3 and the middle cooling section 4, effectively reducing the flow resistance at the inlet hole 1.

[0021] In another embodiment of the present invention: the first branch pipe 6 is obliquely distributed between the first-end cooling section 3 and the liquid inlet 1, and the lower end of the first branch pipe 6 is connected to the liquid inlet 1. The first branch pipe 6, the connecting pipe 10, and the first-end cooling section 3 form a triangle. Because triangles have stability, the structural strength at the liquid inlet 1 is good. (Refer to the attached diagram.) Figure 7The first branch pipe 6 at the liquid inlet 1, the connecting pipe 10, and the initial cooling section 3 form a triangle. Using relevant simulation software, the stress distribution of 350 kPa compressed air introduced into the liquid-cooled plate was predicted using fluid-structure interaction. The results showed a maximum stress of 21 MPa, while the yield strength of the aluminum material used in the liquid-cooled plate is approximately 50 MPa. Secondly, the three branch pipes 6 at the liquid inlet 1 effectively prevent the risk of bulging during air testing, increasing the safety factor. Furthermore, under 350 kPa air testing conditions, the airflow is quickly dispersed, preventing excessive stress from causing bulging of the cover plate 26 of the liquid-cooled plate, thus avoiding defects in the liquid-cooled plate caused by testing. (See attached diagram.) Figure 8 The first branch pipe 6, connecting pipe 10 and the first cooling section 3 at the liquid inlet 1 are rectangular in shape. Using relevant simulation software, the stress distribution of 350 kPa compressed air introduced into the liquid cooling plate is predicted by fluid-structure interaction. The maximum stress is 28 MPa. Although it meets the requirements, it is 33.3% higher than the maximum stress of 21 MPa of the liquid cooling plate of the present invention, and the safety factor is significantly reduced.

[0022] As another embodiment of the present invention: Appendix Figure 2 The cooling section 3 at the beginning, the cooling section 4 in the middle, and the cooling section 5 at the end are distributed sequentially from top to bottom. Multiple support protrusions 11 are provided at the end of the flow channel plate 100 near the liquid inlet 1. These support protrusions 11 are located on the upper and lower sides of the cooling section 3, and also on the upper and lower sides of the cooling section 4. By providing the support protrusions 11, the structural strength of the liquid cooling plate at this location is improved, which is beneficial for enhancing the overall pressure resistance of the liquid cooling plate.

[0023] As another embodiment of the present invention: refer to the appendix Figure 3 The transverse cooling pipes 8 on the first cooling section 3 gradually increase in number along the coolant flow direction. A first step 12 is provided at the outlet end of the first cooling section 3, and a supporting protrusion 11 extends to the first step 12. A second step 13 is provided in the middle of the first cooling section 3, and another supporting protrusion 11 extends to the second step 13. The first step 12 and the second step 13 are respectively located on both sides of the first cooling section 3. The supporting protrusion 11 is composed of multiple segments. The first cooling section 3 and the supporting protrusion 11 are compactly arranged. This structure ensures the cooling effect of the liquid cooling plate while improving its pressure resistance.

[0024] In another embodiment of the present invention: the upper side of the central cooling section 4 at the beginning end is provided with a third step 14 and a fourth step 15, a support protrusion 11 extends to the fourth step 15, and the support protrusion 11 extending to the fourth step 15 is provided with a fifth step 16 that cooperates with the third step 14; the lower side of the central cooling section 4 at the beginning end is provided with a sixth step 17, and another support protrusion 11 extends to the sixth step 17; the third step 14 is located between the fourth step 15 and the branch pipe 6; both the third step 14 and the sixth step 17 are located in the middle of the central cooling section 4, and the fourth step 15 is located at the liquid outlet end of the central cooling section 4. The central cooling section 4 at the beginning end and the support protrusion 11 are arranged compactly. Through this structure, the cooling effect of the liquid cooling plate is ensured while the pressure resistance of the liquid cooling plate is improved.

[0025] In another embodiment of the present invention, a seventh step 18 and an eighth step 19 are respectively provided on the upper and lower sides of the middle cooling section 4 at the end. One support protrusion 11 extends to the seventh step 18, and another support protrusion 11 extends to the eighth step 19. The seventh step 18 is located between the eighth step 19 and the branch pipe 6. The middle cooling section 4 at the end and the support protrusion 11 are arranged compactly. Through this structure, the cooling effect of the liquid cooling plate is guaranteed while the pressure resistance of the liquid cooling plate is improved.

[0026] In another embodiment of the present invention, the upper and lower sides of the middle cooling section 4 at the end are respectively provided with first grooves 20, and the supporting protrusion 11 extends into the first grooves 20. The first grooves 20 are located between the seventh step 18 and the branch pipe 6. This structure further makes the middle cooling section 4 at the end and the supporting protrusion 11 more compact, which improves the pressure resistance of the liquid cooling plate while ensuring the cooling effect of the liquid cooling plate.

[0027] In another embodiment of the present invention, the support protrusions 11 are respectively disposed between the two transverse cooling pipes 8 at the liquid inlet end of the first cooling section 3 and between the two transverse cooling pipes 8 at the liquid inlet end of the middle cooling section 4. This structure further improves the pressure resistance of the liquid cooling plate.

[0028] In another embodiment of the invention, a support protrusion 11 is also provided between the branch pipe 6 and the end cooling section 5. This structure further improves the pressure resistance of the liquid cooling plate.

[0029] The 104-cell 587Ah high-density battery pack weighs 1.2 tons. Load-bearing analysis was performed on the liquid cooling plate and its compatible pallet. Due to the multiple support protrusions on the liquid cooling plate, its load-bearing capacity is effectively enhanced. Under a 1.2-ton load, combined with the pallet, the maximum deformation is only 0.67mm, meeting the design requirements. (See attached diagram.) Figure 9Simulation analysis of the thinning rate of liquid cooling plate forming showed that most values ​​were within 0.1, with the maximum thinning rate being 0.117, which meets the usage requirements.

[0030] Specifically, ventilation holes are made in the support protrusion 11 to prevent trapped gas from entering the brazing furnace and causing deformation.

[0031] In another embodiment of the present invention: the liquid outlet of the first cooling section 3 is connected to the liquid outlet of the middle cooling section 4 via a first liquid outlet pipe 21, the first liquid outlet pipe 21 is connected to the liquid inlet of the final cooling section 5, and the first liquid outlet pipe 21 is connected to a second liquid outlet pipe 22 via multiple connecting pipes 10, with both ends of the second liquid outlet pipe 22 being flush with both ends of the first liquid outlet pipe 21. Through this structural design, the coolant from the first cooling section 3 and the middle cooling section 4 can be dispersed into the final cooling section 5 through the first liquid outlet pipe 21, the connecting pipes 10, and the second liquid outlet pipe 22, which helps to reduce the flow resistance of the liquid cooling plate.

[0032] In another embodiment of the present invention: multiple connecting pipes 10 are provided between the liquid outlet end of the first cooling section 3 and the liquid outlet end of the middle cooling section 4, so as to facilitate the distribution of coolant in the first cooling section 3 into the middle cooling section 4. Connecting pipes 10 are provided between the liquid outlet ends of two adjacent middle cooling sections 4, so as to facilitate the distribution of coolant in the first middle cooling section 4 into the last middle cooling section 4. Connecting pipes 10 are provided between the liquid outlet end of the middle cooling section 4 and the liquid outlet end of the last cooling section 5, so as to facilitate the distribution of coolant in the middle cooling section 4 into the last cooling section 5. This structural design can alleviate the pressure entering the liquid outlet pipes of the first cooling section 3 and the middle cooling section 4, and reduce the flow resistance of the liquid cooling plate.

[0033] In another embodiment of the present invention: the terminal cooling section 5 is provided with a mixing pipe 23, which is connected to the first liquid outlet pipe 21 through multiple transverse cooling pipes 8. The mixing pipe 23 is connected to the liquid outlet hole 2 through multiple drain pipes 24. The U-shaped pipe 7 is connected to the mixing pipe 23. The number of transverse cooling pipes 8 on the terminal cooling section 5 is greater than the number of drain pipes 24. A support protrusion 11 is provided between the second branch pipe 6 and the drain pipe 24. The mixing pipe 23 mixes the low-temperature coolant in the U-shaped pipe 7 with the high-temperature coolant in the terminal cooling section 5, further reducing the outlet coolant temperature and thus preventing the cell 25 at the outlet from becoming too hot.

[0034] In this invention, under the conditions of an inlet flow rate of 10 L / min and a temperature of 0.5℃, the surface temperature difference of the liquid cooling plate is less than 3℃ and the flow resistance is only 10 kPa.

[0035] In this invention, multiple branch pipes 6 are provided at the liquid inlet 1, which facilitates the dispersion and rapid flow of coolant into the first cooling section 3 and each of the middle cooling sections 4, thereby reducing the flow resistance of the liquid cooling plate and controlling the temperature difference between the first cooling section 3 and the middle cooling sections 4. Secondly, a turbulence plate 9 is provided at the liquid outlet of the middle cooling section 4, which can increase turbulence and prevent the local temperature in this area from being too high, thereby further facilitating the control of the temperature difference between the first cooling section 3 and the middle cooling section 4. Thirdly, the U-shaped pipe 7 directly introduces the coolant from the liquid inlet 1 through the branch pipes 6, and then the low-temperature coolant in the U-shaped pipe 7 neutralizes the high-temperature coolant in the end cooling section 5, thereby controlling the temperature difference between the end cooling section 5 and the middle cooling section 4. The combination of these three factors helps to reduce the overall temperature difference of the liquid cooling plate.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A liquid cold plate suitable for high energy high density battery cells, characterized in that, The application relates to a flow channel plate, one side of which is provided with an inlet hole and an outlet hole, a plurality of cooling sections are sequentially arranged in the direction from the inlet hole to the outlet hole, the cooling sections comprise a first-end cooling section, a last-end cooling section and a plurality of middle cooling sections arranged between the first-end cooling section and the last-end cooling section, the inlet hole is connected with the first-end cooling section and the middle cooling sections through branch pipes, the inlet end of the last-end cooling section is connected with the outlet end of the first-end cooling section and the outlet end of the middle cooling sections, a U-shaped pipe is arranged between the last-end cooling section and the middle cooling sections, the branch pipes are connected with the outlet end of the last-end cooling section through the U-shaped pipe, the cooling pipe lines in the transverse direction of the middle cooling sections gradually increase in the flowing direction of the cooling liquid, a plurality of cooling pipe lines in the longitudinal direction are arranged between the cooling pipe lines in the transverse direction of the outlet end of the middle cooling sections, and a step-shaped turbulence plate is arranged between the cooling pipe lines of the outlet end of the middle cooling sections.

2. The liquid cold plate suitable for high energy high density battery cells of claim 1, wherein, The inlet hole is connected with the first-end cooling section through a first branch pipe, the inlet hole is connected with the middle cooling sections through a third branch pipe, the third branch pipe is connected with the first-end cooling section, a second branch pipe is connected with the pipe line from the inlet hole to the third branch pipe, and a plurality of connecting pipes are arranged between the second branch pipe and the third branch pipe.

3. The liquid cold plate suitable for high energy high density battery cells of claim 2, wherein, The first branch pipe is obliquely arranged between the first-end cooling section and the inlet hole, and the lower end of the first branch pipe is connected with the inlet hole.

4. The liquid cold plate suitable for high energy high density battery cells of claim 3, wherein, An end of the flow channel plate close to the inlet hole is provided with a plurality of supporting protrusions, the supporting protrusions are arranged on the upper side and the lower side of the first-end cooling section, and the supporting protrusions are also arranged on the upper side and the lower side of the middle cooling sections.

5. The liquid cold plate suitable for high energy high density battery cells of claim 4, wherein, A first step is arranged at the outlet end of the first-end cooling section, the supporting protrusions extend to the first step, a second step is arranged at the middle of the first-end cooling section, the supporting protrusions extend to the second step, and the first step and the second step are arranged on the two sides of the first-end cooling section respectively.

6. The liquid cold plate suitable for high energy high density battery cells of claim 5, wherein, The upper side of the middle cooling section of the first end is provided with a third step and a fourth step, the supporting protrusions extend to the fourth step, a fifth step matched with the third step is arranged on the supporting protrusions extending to the fourth step, the lower side of the middle cooling section of the first end is provided with a sixth step, the supporting protrusions extend to the sixth step, and the third step is arranged between the fourth step and the branch pipe.

7. The liquid cold plate suitable for high energy high density battery cells of claim 6, wherein, The upper side and the lower side of the middle cooling section of the last end are respectively provided with a seventh step and an eighth step, one of the supporting protrusions extends to the seventh step, the other supporting protrusion extends to the eighth step, and the seventh step is arranged between the eighth step and the branch pipe.

8. The liquid cold plate suitable for high energy high density battery cells of claim 7, wherein, The outlet end of the first-end cooling section is connected with the outlet end of the middle cooling sections through a first outlet pipe, the first outlet pipe is connected with the inlet end of the last-end cooling section, the first outlet pipe is connected with a second outlet pipe through a plurality of connecting pipes, and the two ends of the second outlet pipe are flush with the two ends of the first outlet pipe.

9. The liquid cold plate suitable for high energy high density battery cells of claim 8, wherein, Multiple connecting pipes are provided between the liquid outlet of the first cooling section and the liquid outlet of the middle cooling section. Connecting pipes are provided between the liquid outlets of two adjacent middle cooling sections. Connecting pipes are provided between the liquid outlets of the middle cooling section and the liquid outlet of the last cooling section.

10. The liquid cold plate suitable for high energy high density battery cells of claim 9, wherein, The end cooling section is equipped with a mixing pipe, which is connected to the first liquid outlet pipe through multiple transverse cooling pipes. The mixing pipe is connected to the liquid outlet hole through multiple drain pipes. The U-shaped pipe is connected to the mixing pipe. The number of transverse cooling pipes on the end cooling section is greater than the number of drain pipes. The support protrusion is located between the second branch pipe and the drain pipe.

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