Micro-channel battery liquid cooling device and method for storing heat by using phase change material and preventing battery damage in winter

Abstract

The invention provides a micro-channel battery liquid cooling device capable of storing heat and preventing freezing by using a phase change material. The micro-channel battery liquid cooling device mainly comprises an upper cover part, a bottom plate part and a phase change heat dissipation part, the phase change heat dissipation part comprises an enclosure structure, an annular rib wall and a cavity filled with a phase change material, and a liquid cooling micro-channel is embedded in the annular rib wall; the upper cover part is provided with a liquid cooling water inlet and a convex resin distribution inlet, and the bottom plate part is provided with a concave distribution outlet and a liquid cooling water outlet which are connected through screws to form a sealing system. Through a resin material distribution inlet, overlarge battery surface temperature difference caused by a low-temperature cold point is avoided, and temperature equalization is realized; in summer, the micro-channel absorbs heat of the battery to liquefy the phase-change material, and the phase-change material is radiated outwards through the enclosure structure; in winter, the phase-change material is solidified to release heat, low-temperature damage of the battery is prevented, and shutdown heat preservation is achieved through working waste heat. According to the invention, the vacancy that the traditional liquid cooling technology cannot give consideration to both heat dissipation and freezing prevention is filled, and the safety and energy efficiency of the battery in an extreme temperature environment are remarkably improved.

Description

TECHNICAL FIELD

[0001] The application provides a micro-channel battery liquid cooling device for storing heat by using a phase change material and preventing battery damage in winter, and belongs to the field of battery cooling. BACKGROUND

[0002] With the depletion of oil resources and the aggravation of environmental pollution, new energy vehicles driven by renewable energy electric energy are increasingly valued. As a core component, the performance of the battery directly determines the vehicle's range, service life and overall performance. Temperature significantly affects the capacity, power, charging and discharging efficiency, thermal safety and life of the battery. With the increasing demand of users for new energy vehicle range and fast charging, the heat generated by the battery is increasing, and natural cooling and forced air cooling technology can no longer meet the requirements of rapid cooling and temperature uniformity of the battery. Therefore, liquid cooling technology has become the mainstream choice for new energy vehicle thermal management. The traditional battery liquid cooling technology lacks the function of keeping the battery system warm in winter.

[0003] Some patents have proposed some liquid cooling structures for battery cooling. Patent CN112701383A designs a battery liquid cooling plate, the main feature of which is to use high-temperature-resistant insulating cooling liquid to cool the battery by using semi-submerged liquid cooling technology. The maintenance of the submerged liquid cooling is complex, and the cost is high; patent CN219321460U designs a new energy vehicle battery liquid cooling plate, the main feature of which is that a main flow channel is provided on the liquid cooling plate body, the main flow channel is recessed in the liquid cooling plate body, and a convex cell is also provided on the liquid cooling plate body, the convex cell is distributed along the main flow channel. This design can increase the welding area between the upper and lower stamping plates, more extensively destroy the boundary layer of the fluid, and thus enhance heat exchange, but its structural features inevitably greatly increase the flow resistance of the cooling liquid, which leads to a significant increase in system pump power demand, increases energy consumption, and reduces vehicle efficiency. It is an important cost that needs to be paid when pursuing high-performance heat exchange. At the same time, the above-mentioned technologies only focus on heat dissipation, ignoring the demand for battery heat preservation in winter.

[0004] In order to utilize the battery waste heat in winter and prevent the battery from being damaged by low temperature in winter, the application provides a micro-channel battery liquid cooling device for storing heat by using a phase change material and preventing battery damage in winter. The battery liquid cooling device uses a phase change material to cool the battery in summer and keep the battery warm in winter, and has good heat dissipation effect in combination with the micro-channel liquid cooling technology. At the same time, in winter, the waste heat generated during the use of the battery is utilized, the battery is kept warm when it is idle, the preheating is avoided when it is restarted, and the contact of the battery with the cold energy from the environment is avoided to prevent the battery from being damaged by low temperature. SUMMARY

[0005] The technical problem solved by the present application is to provide a micro-channel battery liquid cooling device using phase change material heat storage and preventing battery damage in winter to solve the problem of waste of waste heat during battery use in the prior art battery liquid cooling technology.

[0006] To achieve the above-mentioned purpose, the present application provides a micro-channel battery liquid cooling device using phase change material heat storage and preventing battery damage in winter, which uses phase change material, has good heat dissipation effect, and utilizes waste heat during battery use in winter.

[0007] The upper cover part includes an upper cover 1, a liquid cooling water inlet 2, a first screw 6-1, a second screw 6-2, a third screw 6-3, a fourth screw 6-4, a first liquid cooling distribution inlet 8-1, a second liquid cooling distribution inlet 8-2, a third liquid cooling distribution inlet 8-3, and a fourth liquid cooling distribution inlet 8-4.

[0008] The lower cover part includes a lower cover 4, a liquid cooling water outlet 5, a fifth screw 7-1, a sixth screw 7-2, a seventh screw 7-3, an eighth screw 7-4, a first liquid cooling distribution outlet 9-1, a second liquid cooling distribution outlet 9-2, a third liquid cooling distribution outlet 9-3, and a fourth liquid cooling distribution outlet 9-4.

[0009] The phase change heat dissipation part includes a containment structure 3, a phase change material cavity 10, an annular rib wall 15, a first rib wall liquid cooling water inlet 11-1, a second rib wall liquid cooling water inlet 11-2, a third rib wall liquid cooling water inlet 11-3, a fourth rib wall liquid cooling water inlet 11-4, a first screw hole 12-1, a second screw hole 12-2, a third screw hole 12-3, a fourth screw hole 12-4, a first rib wall liquid cooling water outlet 13-1, a second rib wall liquid cooling water outlet 13-2, a third rib wall liquid cooling water outlet 13-3, a fourth rib wall liquid cooling water outlet 13-4, a fifth screw hole 14-1, a sixth screw hole 14-2, a seventh screw hole 14-3, and an eighth screw hole 14-4.

[0010] The upper cover part is connected to the phase change heat dissipation part through the first screw 6-1 and the first screw hole 12-1, the second screw 6-2 and the second screw hole 12-2, the third screw 6-3 and the third screw hole 12-3, and the fourth screw 6-4 and the fourth screw hole 12-4, and the first liquid cooling distribution inlet 8-1 is connected to the first rib wall liquid cooling water inlet 11-1, the second liquid cooling distribution inlet 8-2 is connected to the second rib wall liquid cooling water inlet 11-2, the third liquid cooling distribution inlet 8-3 is connected to the third rib wall liquid cooling water inlet 11-3, and the fourth liquid cooling distribution inlet 8-4 is connected to the fourth rib wall liquid cooling water inlet 11-4.

[0011] The upper cover part is connected with the phase change heat dissipation part by the fifth screw 7-1 and the fifth screw hole 14-1, the sixth screw 7-2 and the sixth screw hole 14-2, the seventh screw 7-3 and the seventh screw hole 14-3, the eighth screw 7-4 and the eighth screw hole 14-4, and the first liquid cooling distribution outlet 9-1 is connected with the first rib wall liquid cooling outlet 13-1, the second liquid cooling distribution outlet 9-2 is connected with the second rib wall liquid cooling outlet 13-2, the third liquid cooling distribution outlet 9-3 is connected with the third rib wall liquid cooling outlet 13-3, and the fourth liquid cooling distribution outlet 9-4 is connected with the fourth rib wall liquid cooling outlet 13-4.

[0012] The thickness of the upper cover 1 and the lower cover 4 in the upper cover part is 5mm, and the thickness of the enclosure 3 and the annular rib wall 15 in the phase change heat dissipation part is 3mm.

[0013] The phase change material cavity 10 in the enclosure 3 and the annular rib wall 15 in the phase change heat dissipation part is filled with phase change material, and the phase change material can be paraffin, and the space in the annular rib wall 15 is used to install an energy storage battery.

[0014] The annular rib wall 15 in the phase change heat dissipation part, taking the first annular rib wall 15-1 as an example, the first annular rib wall 15-1 contains the first rib wall liquid cooling inlet 11-1, the liquid cooling microchannel 16 and the first rib wall liquid cooling outlet 13-1 in the wall, the first rib wall liquid cooling inlet 11-1 is connected with the upper end of the liquid cooling microchannel 16, and the lower end of the liquid cooling microchannel 16 is connected with the first rib wall liquid cooling outlet 13-1.

[0015] The upper cover (1), the lower cover (4), the enclosure (3) and the annular rib wall (15) are made of aluminum alloy.

[0016] The first liquid cooling distribution inlet 8-1, the second liquid cooling distribution inlet 8-2, the third liquid cooling distribution inlet 8-3 and the fourth liquid cooling distribution inlet 8-4 in the upper cover 1 are designed as outward protruding structures, protruding 3mm, with a diameter of 2mm and a wall thickness of 0.5mm, and are made of non-metal polycarbonate resin.

[0017] Since the higher temperature of the battery is located in the middle region of the battery, and the temperature of the cooling liquid at the liquid cooling inlet is lower, by using non-metal polycarbonate resin, the temperature at the inlet can be prevented from being too low, causing uneven temperature distribution.

[0018] The first liquid cooling distribution outlet 9-1, the second liquid cooling distribution outlet 9-2, the third liquid cooling distribution outlet 9-3, and the fourth liquid cooling distribution outlet 9-4 in the lower cover 4 are designed as inwardly concave structures, with a concave depth of 3 mm and a diameter of 3 mm; the first rib wall liquid cooling water inlet 11-1, the second rib wall liquid cooling water inlet 11-2, the third rib wall liquid cooling water inlet 11-3, and the fourth rib wall liquid cooling water inlet 11-4 in the heat dissipation part are designed as inwardly concave structures, with a concave depth of 3 mm and a diameter of 3 mm; the first rib wall liquid cooling water outlet 13-1, the second rib wall liquid cooling water outlet 13-2, the third rib wall liquid cooling water outlet 13-3, and the fourth rib wall liquid cooling water outlet 13-4 are designed as outwardly convex structures, with a convexity of 3 mm, a diameter of 2 mm, and a wall thickness of 0.5 mm.

[0019] When the battery is in use, the liquid cooling liquid enters the upper cover 1 from the liquid cooling water inlet 2, and is distributed to the first liquid cooling distribution inlet 8-1, the second liquid cooling distribution inlet 8-2, the third liquid cooling distribution inlet 8-3, and the fourth liquid cooling distribution inlet 8-4 in the upper cover 1. The first liquid cooling distribution inlet 8-1 delivers cooling liquid to the first rib wall liquid cooling water inlet 11-1, the second liquid cooling distribution inlet 8-2 delivers cooling liquid to the second rib wall liquid cooling water inlet 11-2, the third liquid cooling distribution inlet 8-3 delivers cooling liquid to the third rib wall liquid cooling water inlet 11-3, and the fourth liquid cooling distribution inlet 8-4 delivers cooling liquid to the fourth rib wall liquid cooling water inlet 11-4.

[0020] The cooling liquid enters the first annular rib wall 15-1 from the first rib wall liquid cooling water inlet 11-1, and is strengthened in heat exchange by the liquid cooling microchannel 16 in the wall of the first annular rib wall 15-1, absorbs the heat of the battery in the cavity of the first annular rib wall 15-1, cools the battery, and delivers the heat to the phase change material in the cavity 10 between the first annular rib wall 15-1 and the enclosure 3. The phase change material in the cavity 10 absorbs heat, undergoes phase change and liquefaction, and dissipates heat to the outside through the enclosure 3. The liquid cooling microchannel 16 cools the cooling liquid after passing through the phase change material in the cavity 10, and delivers the cooling liquid to the first rib wall liquid cooling water outlet 13-1. The first rib wall liquid cooling water outlet 13-1 delivers the cooling liquid to the first liquid cooling distribution outlet 9-1, and the cooling liquid reaches the liquid cooling water outlet 5 through the first liquid cooling distribution outlet 9-1.

[0021] The cooling liquid enters the second annular rib wall 15-2 through the second rib wall liquid cooling water inlet 11-2, is absorbed by the battery in the cavity of the second annular rib wall 15-2 through the liquid cooling microchannel 16 in the wall of the second annular rib wall 15-2 to strengthen heat exchange, and is cooled and delivered to the phase change material in the cavity 10 between the second annular rib wall 15-2 and the enclosure 3. The phase change material in the cavity 10 absorbs heat, changes phase and liquefies, and the phase change material in the cavity 10 dissipates heat to the outside through the enclosure 3. The liquid cooling microchannel 16 is cooled after passing through the phase change material in the cavity 10, and then delivers the cooling liquid to the second rib wall liquid cooling water outlet 13-2. The second rib wall liquid cooling water outlet 13-2 delivers the cooling liquid to the second liquid cooling distribution outlet 9-2, and then to the liquid cooling water outlet 5 through the second liquid cooling distribution outlet 9-2.

[0022] The cooling liquid enters the third annular rib wall 15-3 through the third rib wall liquid cooling water inlet 11-3, is absorbed by the battery in the cavity of the third annular rib wall 15-3 through the liquid cooling microchannel 16 in the wall of the third annular rib wall 15-3 to strengthen heat exchange, and is cooled and delivered to the phase change material in the cavity 10 between the third annular rib wall 15-3 and the enclosure 3. The phase change material in the cavity 10 absorbs heat, changes phase and liquefies, and the phase change material in the cavity 10 dissipates heat to the outside through the enclosure 3. The liquid cooling microchannel 16 is cooled after passing through the phase change material in the cavity 10, and then delivers the cooling liquid to the third rib wall liquid cooling water outlet 13-3. The third rib wall liquid cooling water outlet 13-3 delivers the cooling liquid to the third liquid cooling distribution outlet 9-3, and then to the liquid cooling water outlet 5 through the third liquid cooling distribution outlet 9-3.

[0023] The cooling liquid enters the fourth annular rib wall 15-4 through the fourth rib wall liquid cooling water inlet 11-4, is absorbed by the battery in the cavity of the fourth annular rib wall 15-4 through the liquid cooling microchannel 16 in the wall of the fourth annular rib wall 15-4 to strengthen heat exchange, and is cooled and delivered to the phase change material in the cavity 10 between the fourth annular rib wall 15-4 and the enclosure 3. The phase change material in the cavity 10 absorbs heat, changes phase and liquefies, and the phase change material in the cavity 10 dissipates heat to the outside through the enclosure 3. The liquid cooling microchannel 16 is cooled after passing through the phase change material in the cavity 10, and then delivers the cooling liquid to the fourth rib wall liquid cooling water outlet 13-4. The fourth rib wall liquid cooling water outlet 13-4 delivers the cooling liquid to the fourth liquid cooling distribution outlet 9-4, and then to the liquid cooling water outlet 5 through the fourth liquid cooling distribution outlet 9-4.

[0024] When it is winter, the phase change material in the cavity 10 liquefies by absorbing the heat released by the battery during use. When the battery stops being used, the phase change material in the cavity 10 keeps the battery warm through the annular rib wall 15 to avoid preheating when the battery is started again. At the same time, the phase change material in the cavity 10 can also release heat through phase change to prevent the environment from contacting the battery and to keep the battery warm to prevent damage to the battery caused by low temperature. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 Micro-channel battery liquid cooling device for application of phase change material to store heat and prevent battery damage in winter.

[0026] Figure 1 Figure 1: Micro-channel battery liquid cooling device for application of phase change material to store heat and prevent battery damage in winter. 1. Upper cover, 2. Liquid cooling water inlet, 3. Enclosure, 4. Lower cover, 5. Liquid cooling water outlet, 6-1. First screw, 6-2. Second screw, 6-3. Third screw, 6-4. Fourth screw, 15. Annular rib wall.

[0027] Figure 2 Figure 2: Schematic diagram of the upper cover part structure.

[0028] Figure 2 Figure 3: Schematic diagram of the upper cover part structure. 1. Upper cover, 2. Liquid cooling water inlet, 6-1. First screw, 6-2. Second screw, 6-3. Third screw, 6-4. Fourth screw, 8-1. First liquid cooling distribution inlet, 8-2. Second liquid cooling distribution inlet, 8-3. Third liquid cooling distribution inlet, 8-4. Fourth liquid cooling distribution inlet.

[0029] Figure 3 Figure 4: Schematic diagram of the lower cover part structure.

[0030] Figure 3 Figure 5: Schematic diagram of the lower cover part structure. 4. Lower cover, 5. Liquid cooling water outlet, 7-1. Fifth screw, 7-2. Sixth screw, 7-3. Seventh screw, 7-4. Eighth screw, 9-1. First liquid cooling distribution outlet, 9-2. Second liquid cooling distribution outlet, 9-3. Third liquid cooling distribution outlet, 9-4. Fourth liquid cooling distribution outlet.

[0031] Figure 4 Figure 6: Top view of the phase change heat dissipation part.

[0032] Figure 4 Figure 7: Top view of the phase change heat dissipation part. 3. Enclosure, 10. Cavity, 11-1. First partition rib wall liquid cooling water inlet, 11-2. Second partition rib wall liquid cooling water inlet, 11-3. Third partition rib wall liquid cooling water inlet, 11-4. Fourth partition rib wall liquid cooling water inlet, 12-1. First screw hole, 12-2. Second screw hole, 12-3. Third screw hole, 12-4. Fourth screw hole, 15-1. First annular rib wall, 15-2. Second annular rib wall, 15-3. Third annular rib wall, 15-4. Fourth annular rib wall.

[0033] Figure 5 Figure 8: Bottom view of the phase change heat dissipation part.

[0034] Figure 5Middle: 3. Envelope, 13-1. First rib wall liquid cooling outlet, 13-2. Second rib wall liquid cooling outlet, 13-3. Third rib wall liquid cooling outlet, 13-4. Fourth rib wall liquid cooling outlet, 14-1. Fifth screw hole, 14-2. Sixth screw hole, 14-3. Seventh screw hole, 14-4. Eighth screw hole, 15-1. First annular rib wall, 15-2. Second annular rib wall, 15-3. Third annular rib wall, 15-4. Fourth annular rib wall.

[0035] Figure 6 It is a perspective view of the annular rib wall.

[0036] Figure 6 Middle: 11-1. First rib wall liquid cooling inlet, 13-1. First rib wall liquid cooling outlet, 15-1. First annular rib wall, 16. Liquid cooling microchannel. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and beneficial technical effects of the present application clearer, the present application will be further described in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described in the present specification are only for the purpose of explaining the present application, and are not intended to limit the present application.

[0038] The present application includes an upper cover portion, a lower cover portion, and a heat generating electronic component.

[0039] In summer, the battery needs to be cooled, and the liquid cooling liquid enters the upper cover 1 from the liquid cooling inlet 2, and the flow is distributed to the first liquid cooling distribution inlet 8-1, the second liquid cooling distribution inlet 8-2, the third liquid cooling distribution inlet 8-3, and the fourth liquid cooling distribution inlet 8-4 in the upper cover 1. The first liquid cooling distribution inlet 8-1 delivers cooling liquid to the first rib wall liquid cooling inlet 11-1, the second liquid cooling distribution inlet 8-2 delivers cooling liquid to the second rib wall liquid cooling inlet 11-2, the third liquid cooling distribution inlet 8-3 delivers cooling liquid to the third rib wall liquid cooling inlet 11-3, and the fourth liquid cooling distribution inlet 8-4 delivers cooling liquid to the fourth rib wall liquid cooling inlet 11-4.

[0040] The cooling liquid enters the first annular rib wall 15-1 through the first rib wall liquid cooling water inlet 11-1, is absorbed by the battery in the cavity of the first annular rib wall 15-1 through the liquid cooling microchannel 16 in the wall of the first annular rib wall 15-1 to strengthen heat exchange, and is cooled and delivered to the phase change material in the cavity 10 between the first annular rib wall 15-1 and the enclosure 3. The phase change material in the cavity 10 absorbs heat, changes phase and liquefies, and the phase change material in the cavity 10 is cooled through the enclosure 3 to dissipate heat to the outside. The cooling liquid is delivered to the first rib wall liquid cooling water outlet 13-1 through the liquid cooling microchannel 16 after passing through the phase change material in the cavity 10, and is delivered to the first liquid cooling distribution outlet 9-1 through the first rib wall liquid cooling water outlet 13-1, and reaches the liquid cooling water outlet 5 through the first liquid cooling distribution outlet 9-1.

[0041] The cooling liquid enters the second annular rib wall 15-2 through the second rib wall liquid cooling water inlet 11-2, is absorbed by the battery in the cavity of the second annular rib wall 15-2 through the liquid cooling microchannel 16 in the wall of the second annular rib wall 15-2 to strengthen heat exchange, and is cooled and delivered to the phase change material in the cavity 10 between the second annular rib wall 15-2 and the enclosure 3. The phase change material in the cavity 10 absorbs heat, changes phase and liquefies, and the phase change material in the cavity 10 is cooled through the enclosure 3 to dissipate heat to the outside. The cooling liquid is delivered to the second rib wall liquid cooling water outlet 13-2 through the liquid cooling microchannel 16 after passing through the phase change material in the cavity 10, and is delivered to the second liquid cooling distribution outlet 9-2 through the second rib wall liquid cooling water outlet 13-2, and reaches the liquid cooling water outlet 5 through the second liquid cooling distribution outlet 9-2.

[0042] The cooling liquid enters the third annular rib wall 15-3 through the third rib wall liquid cooling water inlet 11-3, is absorbed by the battery in the cavity of the third annular rib wall 15-3 through the liquid cooling microchannel 16 in the wall of the third annular rib wall 15-3 to strengthen heat exchange, and is cooled and delivered to the phase change material in the cavity 10 between the third annular rib wall 15-3 and the enclosure 3. The phase change material in the cavity 10 absorbs heat, changes phase and liquefies, and the phase change material in the cavity 10 is cooled through the enclosure 3 to dissipate heat to the outside. The cooling liquid is delivered to the third rib wall liquid cooling water outlet 13-3 through the liquid cooling microchannel 16 after passing through the phase change material in the cavity 10, and is delivered to the third liquid cooling distribution outlet 9-3 through the third rib wall liquid cooling water outlet 13-3, and reaches the liquid cooling water outlet 5 through the third liquid cooling distribution outlet 9-3.

[0043] The cooling liquid enters the fourth annular rib wall 15-4 through the fourth rib wall liquid cooling water inlet 11-4, and is strengthened in heat exchange by the liquid cooling microchannel 16 in the wall body of the fourth annular rib wall 15-4, absorbs the heat of the battery in the cavity of the fourth annular rib wall 15-4, cools the battery, and transmits to the phase change material in the cavity 10 between the fourth annular rib wall 15-4 and the enclosure 3. The phase change material in the cavity 10 absorbs heat, undergoes phase change and liquefaction, and the phase change material in the cavity 10 dissipates heat to the outside through the enclosure 3. The liquid cooling microchannel 16 cools the cooling liquid after passing through the phase change material in the cavity 10 and delivers the cooling liquid to the fourth rib wall liquid cooling water outlet 13-4. The fourth rib wall liquid cooling water outlet 13-4 delivers the cooling liquid to the fourth liquid cooling distribution outlet 9-4, and the cooling liquid reaches the liquid cooling water outlet 5 through the fourth liquid cooling distribution outlet 9-4.

[0044] When it is winter, the liquid cooling liquid enters the upper cover 1 through the liquid cooling water inlet 2, and the flow is distributed to the first liquid cooling distribution inlet 8-1, the second liquid cooling distribution inlet 8-2, the third liquid cooling distribution inlet 8-3, and the fourth liquid cooling distribution inlet 8-4 in the upper cover 1. The first liquid cooling distribution inlet 8-1 delivers the cooling liquid to the first rib wall liquid cooling water inlet 11-1, the second liquid cooling distribution inlet 8-2 delivers the cooling liquid to the second rib wall liquid cooling water inlet 11-2, the third liquid cooling distribution inlet 8-3 delivers the cooling liquid to the third rib wall liquid cooling water inlet 11-3, and the fourth liquid cooling distribution inlet 8-4 delivers the cooling liquid to the fourth rib wall liquid cooling water inlet 11-4.

[0045] The cooling liquid enters the first annular rib wall 15-1 through the first rib wall liquid cooling water inlet 11-1, and is strengthened in heat exchange by the liquid cooling microchannel 16 in the wall body of the first annular rib wall 15-1, absorbs the heat of the battery in the cavity of the first annular rib wall 15-1, cools the battery, and transmits to the phase change material in the cavity 10 between the first annular rib wall 15-1 and the enclosure 3. The phase change material in the cavity 10 absorbs heat, undergoes phase change and liquefaction, and the phase change material in the cavity 10 stores heat. The liquid cooling microchannel 16 cools the cooling liquid after passing through the phase change material in the cavity 10 and delivers the cooling liquid to the first rib wall liquid cooling water outlet 13-1. The first rib wall liquid cooling water outlet 13-1 delivers the cooling liquid to the first liquid cooling distribution outlet 9-1, and the cooling liquid reaches the liquid cooling water outlet 5 through the first liquid cooling distribution outlet 9-1. When the battery stops working, the heat stored by the phase change material in the cavity 10 is discharged to the battery in the cavity of the first annular rib wall 15-1, avoiding damage to the battery in the cavity of the first annular rib wall 15-1 due to low temperature.

[0046] The cooling liquid enters the second annular rib wall 15-2 through the second rib wall liquid cooling water inlet 11-2, is absorbed by the second annular rib wall 15-2 to heat the battery, and is transmitted to the phase change material in the cavity 10 between the second annular rib wall 15-2 and the enclosure 3. The phase change material in the cavity 10 absorbs heat, changes phase, and liquefies. The phase change material in the cavity 10 stores heat. The liquid cooling microchannel 16 is cooled by the phase change material in the cavity 10, and then delivers the cooling liquid to the second rib wall liquid cooling water outlet 13-2. The second rib wall liquid cooling water outlet 13-2 delivers the cooling liquid to the second liquid cooling distribution outlet 9-2, and then to the liquid cooling water outlet 5. When the battery stops working, the heat stored by the phase change material in the cavity 10 is released to the battery in the second annular rib wall 15-2, avoiding damage to the battery in the second annular rib wall 15-2.

[0047] The cooling liquid enters the third annular rib wall 15-3 through the third rib wall liquid cooling water inlet 11-3, is absorbed by the third annular rib wall 15-3 to heat the battery, and is transmitted to the phase change material in the cavity 10 between the third annular rib wall 15-3 and the enclosure 3. The phase change material in the cavity 10 absorbs heat, changes phase, and liquefies. The phase change material in the cavity 10 stores heat. The liquid cooling microchannel 16 is cooled by the phase change material in the cavity 10, and then delivers the cooling liquid to the third rib wall liquid cooling water outlet 13-3. The third rib wall liquid cooling water outlet 13-3 delivers the cooling liquid to the third liquid cooling distribution outlet 9-3, and then to the liquid cooling water outlet 5. When the battery stops working, the heat stored by the phase change material in the cavity 10 is released to the battery in the third annular rib wall 15-3, avoiding damage to the battery in the third annular rib wall 15-3.

[0048] The cooling liquid enters the fourth annular rib wall 15-4 through the fourth rib wall liquid cooling water inlet 11-4, is strengthened heat exchange by the liquid cooling microchannel 16 in the wall body of the fourth annular rib wall 15-4, absorbs the heat of the battery in the cavity of the fourth annular rib wall 15-4, cools the battery, and is transmitted to the phase change material in the cavity 10 between the fourth annular rib wall 15-4 and the enclosure 3. The phase change material in the cavity 10 absorbs heat, changes phase, and liquefies. The phase change material in the cavity 10 stores heat. The liquid cooling microchannel 16 is cooled after passing through the phase change material in the cavity 10, and the cooling liquid is transported to the fourth rib wall liquid cooling water outlet 13-4. The fourth rib wall liquid cooling water outlet 13-4 transports the cooling liquid to the fourth liquid cooling distribution outlet 9-4, and reaches the liquid cooling water outlet 5 through the fourth liquid cooling distribution outlet 9-4. When the battery stops working, the heat stored by the phase change material in the cavity 10 is discharged to the battery in the cavity of the fourth annular rib wall 15-4, so that the battery in the cavity of the fourth annular rib wall 15-4 is prevented from being damaged by low temperature.

Claims

1. A microchannel battery liquid cooling device that uses phase change materials to store heat and prevent battery damage in winter, characterized by: It includes an upper cover part, a lower cover part and a phase change heat dissipation part; The upper cover portion comprises an upper cover (1), a liquid cooling water inlet (2), a first screw (6-1), a second screw (6-2), a third screw (6-3), a fourth screw (6-4), a first liquid cooling distribution inlet (8-1), a second liquid cooling distribution inlet (8-2), a third liquid cooling distribution inlet (8-3), and a fourth liquid cooling distribution inlet (8-4); The lower cover portion comprises a lower cover (4), a liquid cooling outlet (5), a fifth screw (7-1), a sixth screw (7-2), a seventh screw (7-3), an eighth screw (7-4), a first liquid cooling distribution outlet (9-1), a second liquid cooling distribution outlet (9-2), a third liquid cooling distribution outlet (9-3), and a fourth liquid cooling distribution outlet (9-4); The phase change heat dissipation part comprises an enclosure structure (3), a phase change material cavity (10), an annular rib wall (15), a first rib wall liquid cooling water inlet (11-1), a second rib wall liquid cooling water inlet (11-2), a third rib wall liquid cooling water inlet (11-3), a fourth rib wall liquid cooling water inlet (11-4), a first screw hole (12-1), a second screw hole (12-2), a third screw hole (12-3), a fourth screw hole (12-4), a first rib wall liquid cooling water outlet (13-1), a second rib wall liquid cooling water outlet (13-2), a third rib wall liquid cooling water outlet (13-3), a fourth rib wall liquid cooling water outlet (13-4), a fifth screw hole (14-1), a sixth screw hole (14-2), a seventh screw hole (14-3), and an eighth screw hole (14-4); The upper cover portion is connected to the phase change heat dissipation portion by means of a first screw (6-1) and a first screw hole (12-1), a second screw (6-2) and a second screw hole (12-2), a third screw (6-3) and a third screw hole (12-3), and a fourth screw (6-4) and a fourth screw hole (12-4); and the first liquid cooling distribution inlet (8-1) is connected to the first partition wall liquid cooling water inlet (11-1), the second liquid cooling distribution inlet (8-2) is connected to the second partition wall liquid cooling water inlet (11-2), the third liquid cooling distribution inlet (8-3) is connected to the third partition wall liquid cooling water inlet (11-3), and the fourth liquid cooling distribution inlet (8-4) is connected to the fourth partition wall liquid cooling water inlet (11-4); The upper cover portion is connected to the phase change heat dissipation portion by means of a fifth screw (7-1) and a fifth screw hole (14-1), a sixth screw (7-2) and a sixth screw hole (14-2), a seventh screw (7-3) and a seventh screw hole (14-3), and an eighth screw (7-4) and a eighth screw hole (14-4), and the first liquid cooling distribution outlet (9-1) is connected to the first partition wall liquid cooling outlet (13-1), the second liquid cooling distribution outlet (9-2) is connected to the second partition wall liquid cooling outlet (13-2), the third liquid cooling distribution outlet (9-3) is connected to the third partition wall liquid cooling outlet (13-3), and the fourth liquid cooling distribution outlet (9-4) is connected to the fourth partition wall liquid cooling outlet (13-4).

2. The microchannel battery liquid cooling device for storing heat using phase change materials and preventing battery damage in winter according to claim 1 is characterized by: The thickness of the upper cover (1) and the lower cover (4) in the upper cover part is 5 mm; the thickness of the enclosure structure (3) and the annular rib wall (15) in the phase change heat dissipation part is 3 mm.

3. The microchannel battery liquid cooling device for storing heat using phase change materials and preventing battery damage in winter according to claim 1 is characterized by: The phase change material cavity (10) in the barrier layer between the enclosure structure (3) and the annular rib wall (15) in the phase change heat dissipation part is filled with phase change material, which can be paraffin. An energy storage battery is installed in the space in the annular rib wall (15).

4. The microchannel battery liquid cooling device for storing heat using phase change materials and preventing battery damage in winter according to claim 1 is characterized in that: The annular rib wall (15) in the phase change heat dissipation part, taking the first annular rib wall (15-1) as an example, contains a first partition rib wall liquid cooling water inlet (11-1), a liquid cooling microchannel (16), and a first partition rib wall liquid cooling water outlet (13-1) in the first annular rib wall (15-1); the first partition rib wall liquid cooling water inlet (11-1) is connected to the upper end of the liquid cooling microchannel (16), and the lower end of the liquid cooling microchannel (16) is connected to the first partition rib wall liquid cooling water outlet (13-1).

5. The microchannel battery liquid cooling device for storing heat using phase change materials and preventing battery damage in winter according to claim 1 is characterized in that: The upper cover (1), the lower cover (4), the enclosure structure (3) and the annular rib wall (15) are made of aluminum alloy.

6. The microchannel battery liquid cooling device for storing heat using phase change materials and preventing battery damage in winter according to claim 1 is characterized in that: The first liquid cooling distribution inlet (8-1), the second liquid cooling distribution inlet (8-2), the third liquid cooling distribution inlet (8-3), and the fourth liquid cooling distribution inlet (8-4) in the upper cover (1) are designed as an outwardly protruding structure, with a protrusion of 3mm, a diameter of 2mm, and a wall thickness of 0.5mm. Non-metallic polycarbonate resin is used to avoid uneven temperature distribution on the battery surface caused by excessively low inlet temperature; the first liquid cooling distribution outlet (9-1), the second liquid cooling distribution outlet (9-2), the third liquid cooling distribution outlet (9-3), and the fourth liquid cooling distribution outlet (9-4) in the lower cover (4) are designed as an inwardly concave structure. , concave 3mm, with a diameter of 3mm; the first rib wall liquid cooling water inlet (11-1), the second rib wall liquid cooling water inlet (11-2), the third rib wall liquid cooling water inlet (11-3), and the fourth rib wall liquid cooling water inlet (11-4) in the heat dissipation part are designed as an inward concave structure, concave 3mm, with a diameter of 3mm; the first rib wall liquid cooling water outlet (13-1), the second rib wall liquid cooling water outlet (13-2), the third rib wall liquid cooling water outlet (13-3), and the fourth rib wall liquid cooling water outlet (13-4) are designed as an outward convex structure, protruding 3mm, with a diameter of 2mm and a wall thickness of 0.5mm.

7. The method for operating a microchannel battery liquid cooling device that utilizes phase change materials for heat storage and prevents battery damage in winter according to claim 1, characterized in that: When the battery is in use, the liquid cooling liquid enters the upper cover (1) from the liquid cooling water inlet (2), and the flow rate is distributed to the first liquid cooling distribution inlet (8-1), the second liquid cooling distribution inlet (8-2), the third liquid cooling distribution inlet (8-3), and the fourth liquid cooling distribution inlet (8-4) at the upper cover (1); the first liquid cooling distribution inlet (8-1) transports the cooling liquid to the first partition wall liquid cooling water inlet (11-1), the second liquid cooling distribution inlet (8-2) transports the cooling liquid to the second partition wall liquid cooling water inlet (11-2), the third liquid cooling distribution inlet (8-3) transports the cooling liquid to the third partition wall liquid cooling water inlet (11-3), and the fourth liquid cooling distribution inlet (8-4) transports the cooling liquid to the fourth partition wall liquid cooling water inlet (11-4); The cooling liquid enters the first annular rib wall (15-1) from the first partition wall liquid cooling water inlet (11-1), and enhances heat exchange through the liquid cooling microchannel (16) in the wall of the first annular rib wall (15-1), absorbs the heat of the battery in the cavity of the first annular rib wall (15-1), cools the battery, and transmits the heat to the phase change material in the cavity (10) between the first annular rib wall (15-1) and the enclosure structure (3). The phase change material in the cavity (10) absorbs heat, undergoes phase change and liquefies, and the phase change material in the cavity (10) dissipates heat to the outside through the enclosure structure (3). After the phase change material in the cavity (10) is cooled, the cooling liquid is transported to the first partition wall liquid cooling outlet (13-1) through the liquid cooling microchannel (16). The first partition wall liquid cooling outlet (13-1) transports the cooling liquid to the first liquid cooling distribution outlet (9-1), and the cooling liquid reaches the liquid cooling outlet (5) through the first liquid cooling distribution outlet (9-1). The cooling liquid enters the second annular rib wall (15-2) from the second partition wall liquid cooling water inlet (11-2), and enhances heat exchange through the liquid cooling microchannel (16) in the wall of the second annular rib wall (15-2), absorbs the heat of the battery in the cavity of the second annular rib wall (15-2), cools the battery, and transmits the heat to the phase change material in the cavity (10) between the second annular rib wall (15-2) and the enclosure structure (3). The phase change material in the cavity (10) absorbs heat, undergoes phase change and liquefies, and the phase change material in the cavity (10) dissipates heat to the outside through the enclosure structure (3). After the phase change material in the cavity (10) is cooled, the cooling liquid is transported to the second partition wall liquid cooling outlet (13-2) through the liquid cooling microchannel (16). The second partition wall liquid cooling outlet (13-2) transports the cooling liquid to the second liquid cooling distribution outlet (9-2), and the cooling liquid reaches the liquid cooling outlet (5) through the second liquid cooling distribution outlet (9-2). The cooling liquid enters the third annular rib wall (15-3) from the third partition wall liquid cooling water inlet (11-3), and enhances heat exchange through the liquid cooling microchannel (16) in the wall of the third annular rib wall (15-3), absorbs the heat of the battery in the cavity of the third annular rib wall (15-3), cools the battery, and transmits the heat to the phase change material in the cavity (10) between the third annular rib wall (15-3) and the enclosure structure (3). The phase change material in the cavity (10) absorbs heat, undergoes phase change and liquefies, and the phase change material in the cavity (10) dissipates heat to the outside through the enclosure structure (3). After the phase change material in the cavity (10) is cooled, the cooling liquid is transported to the third partition wall liquid cooling outlet (13-3) through the liquid cooling microchannel (16). The third partition wall liquid cooling outlet (13-3) transports the cooling liquid to the third liquid cooling distribution outlet (9-3), and the cooling liquid reaches the liquid cooling outlet (5) through the third liquid cooling distribution outlet (9-3). The cooling liquid enters the fourth annular rib wall (15-4) from the fourth partition rib wall liquid cooling water inlet (11-4), and enhances heat exchange through the liquid cooling microchannel (16) in the wall of the fourth annular rib wall (15-4), absorbs the heat of the battery in the cavity of the fourth annular rib wall (15-4), cools the battery, and transmits the heat to the phase change material in the cavity (10) between the fourth annular rib wall (15-4) and the enclosure structure (3). The phase change material in the cavity (10) absorbs heat, undergoes phase change and liquefies, and the phase change material in the cavity (10) dissipates heat to the outside through the enclosure structure (3). After the phase change material in the cavity (10) is cooled, the cooling liquid is transported to the fourth partition rib wall liquid cooling outlet (13-4) through the liquid cooling microchannel (16). The fourth partition rib wall liquid cooling outlet (13-4) transports the cooling liquid to the fourth liquid cooling distribution outlet (9-4), and the cooling liquid reaches the liquid cooling outlet (5) through the fourth liquid cooling distribution outlet (9-4). In winter, the phase change material in the cavity (10) absorbs the heat released when the battery is in use and liquefies. When the battery is not in use, the phase change material in the cavity (10) keeps the battery warm through the annular rib wall (15), avoiding restart preheating. At the same time, the phase change material in the cavity (10) can also release heat through phase change, preventing the ambient cold from contacting the battery, playing a role in heat preservation, and preventing the battery from being damaged by low temperature.

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