Thermal management system for battery pack, control method of thermal management system and energy storage system

Abstract

The invention relates to the technical field of energy storage, particularly provides a thermal management system for a battery pack, a control method of the thermal management system and an energy storage system, and aims to solve the problem of poor thermal management effect caused by relatively high energy consumption of an existing thermal management system. The heat management system comprises a battery pack, a phase change heat pipe assembly and a liquid storage component, the phase change heat pipe assembly is provided with a first heat exchange end and a second heat exchange end, the first heat exchange end is used for exchanging heat with the battery pack, and the liquid storage component is provided with a liquid storage cavity used for storing cooling liquid. At least one part of the second heat exchange end is soaked in the cooling liquid and exchanges heat with the cooling liquid, the liquid storage component can heat the cooling liquid and can cool the cooling liquid, the heat management system further comprises a temperature detection component, and the temperature detection component is in communication connection with the liquid storage component. The safety of the thermal management system can be improved, the thermal management energy consumption is reduced, the thermal management of the thermal management system is more intelligent, and the thermal management effect of the battery pack is greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and specifically provides a thermal management system for a battery pack, a control method thereof, and an energy storage system. Background Art

[0002] In the existing technology, a liquid cooling unit is usually used to manage the thermal state of the battery pack. Specifically, a liquid cooling plate is set at the bottom of the battery cell, and a coolant flow channel is set inside the liquid cooling plate. The liquid cooling plate is connected to the liquid cooling host through a liquid cooling pipe to form a liquid cooling circuit. The coolant circulates in the liquid cooling circuit under the drive of the compressor. By controlling the temperature or flow rate of the coolant, heat exchange with the battery cell is achieved, and the temperature of the battery cell body is indirectly controlled.

[0003] Since the liquid cooling unit uses the liquid cooling host as the power source of the thermal management system to perform thermal management on the battery pack, the energy consumption is relatively high. In addition, during the process of thermal management of the battery pack, condensation is easily generated on the part where the liquid cooling plate contacts the battery pack, thereby affecting the safety of the battery pack and resulting in poor thermal management of the battery.

[0004] In addition, although the liquid cooling unit can effectively manage the thermal state of the battery pack, the battery pack still has the risk of fire due to thermal runaway, resulting in poor safety of the energy storage system. Summary of the Invention

[0005] The present invention aims to solve the above technical problems at least to a certain extent, that is, to solve at least to a certain extent the problem that the existing thermal management system has poor thermal management effect due to high energy consumption and low safety.

[0006] In a first aspect, the present invention provides a thermal management system for a battery pack, the thermal management system comprising a battery pack, a phase-change heat pipe assembly and a liquid storage component, wherein the phase-change heat pipe assembly encapsulates a phase-change working medium, the phase-change heat pipe assembly has a first heat exchange end and a second heat exchange end, the first heat exchange end is arranged adjacent to the battery pack and is used to exchange heat with the battery pack, the liquid storage component has a liquid storage cavity for storing a coolant, at least a portion of the second heat exchange end is immersed in the coolant and exchanges heat with the coolant, the liquid storage component has a heating mode and a cooling mode, the liquid storage component is configured to heat the coolant when it is in the heating mode and to cool the coolant when it is in the cooling mode, wherein the thermal management system further comprises a temperature detection component, the temperature detection component is used to detect the temperature in the battery pack, and the temperature detection component is communicatively connected to the liquid storage component.

[0007] In the above-mentioned preferred technical solution of the thermal management system for the battery pack, the liquid storage component also includes a heating element and a cooling element, the heating element is used to heat the coolant, and the cooling element is used to cool the coolant, wherein the temperature detection component is communicatively connected with the heating element and the cooling element; and / or, the thermal management system also includes a spraying mechanism, which is configured to spray the cooling liquid in the liquid storage chamber onto the battery pack.

[0008] In the above-mentioned preferred technical solution of the thermal management system for the battery pack, the spray mechanism includes a nozzle, a spray pipe and a pump body arranged on the spray pipe. One end of the spray pipe is connected to the nozzle, and the other end of the spray pipe is connected to the liquid storage chamber. The pump body is used to transport the coolant in the liquid storage chamber to the nozzle.

[0009] In the above-mentioned preferred technical solution of the thermal management system for the battery pack, the thermal management system also includes a heat exchange plate and a box cover, the heat exchange plate includes a first plate body and a second plate body connected to each other, the box cover is connected to the first plate body to form an accommodating space, the battery pack is arranged in the accommodating space, the phase change heat pipe assembly is arranged on the heat exchange plate, the first heat exchange end is formed on the first plate body, the second heat exchange end is formed on the second plate body and at least a portion of the second plate body is immersed in the coolant; wherein, the phase change heat pipe assembly includes an L-shaped heat pipe and / or a loop heat pipe.

[0010] In the above-mentioned preferred technical solution of the thermal management system for the battery pack, the phase-change heat pipe assembly includes an L-shaped heat pipe and a loop heat pipe, the L-shaped heat pipe includes an L-shaped channel formed in the heat exchange plate and a first phase-change working medium encapsulated in the L-shaped channel, wherein: a loop channel is provided in the heat exchange plate, the loop heat pipe includes an annular pipeline and a second phase-change working medium encapsulated in the annular pipeline, the annular pipeline is passed through the loop channel, and the loop heat pipe is configured to drive the second phase-change working medium to circulate in the annular pipeline; or, the loop heat pipe includes a first pipe section, a second pipe section and a second phase-change working medium formed in the heat exchange plate, the first pipe section and the second pipe section are connected in sequence to form an annular pipeline, the second phase-change working medium is encapsulated in the annular pipeline, and the loop heat pipe is configured to drive the second phase-change working medium to circulate in the annular pipeline.

[0011] In the above-mentioned preferred technical solution of the thermal management system for the battery pack, the loop heat pipe also includes an evaporator, and the two ends of the loop pipe are respectively connected to the inlet and outlet of the evaporator to form a circulation loop, and the evaporator is used to vaporize the phase change working medium to drive the phase change working medium to circulate in the circulation loop; and / or, the loop heat pipe also includes a liquid absorption core arranged in the loop pipe, and the liquid absorption core is used to drive the second phase change working medium to circulate in the loop pipe; and / or, the filling rate of the first phase change working medium in the L-shaped channel is 40%~70%; and / or, the filling rate of the second phase change working medium in the loop pipe is 50%~70%.

[0012] In the preferred technical solution of the thermal management system for the battery pack described above, the heat exchange plate further includes a bent plate arranged between the first plate body and the second plate body, wherein: the L-shaped channel includes an evaporation channel arranged in the first plate body, a bent channel arranged in the bent plate, and a condensation channel arranged in the second plate body; and / or, the loop channel includes a first channel, a bending avoidance hole, and a second channel arranged in a one-to-one correspondence, the first channel is arranged in the first plate body, the bending avoidance hole is arranged on the bending plate, the second channel is arranged in the second plate body, and the number of the loop channels is at least two; and / or, the number of the L-shaped channels and the loop channels are both multiple, and the L-shaped channels and the loop channels are alternately arranged on the heat exchange plate in a direction perpendicular to the L-shaped channel; and / or, a capillary wick structure is provided in the L-shaped channel, the The capillary core structure includes a protruding structure arranged on the inner wall of the L-shaped channel, the protruding structure extends along the axial direction of the L-shaped channel, the number of the protruding structures is multiple and the multiple protruding structures are arranged in sequence along the circumference of the L-shaped channel; or, the capillary core structure includes a gas channel and a liquid channel, the gas channel and the liquid channel both extend along the length direction of the L-shaped channel, the number of the liquid channels is multiple and the multiple liquid channels are spaced apart along the circumference of the gas channel, and the gas channel and the liquid channel are connected through a hole; and / or, a weight loss channel is also provided on the heat exchange plate, the number of the weight loss channels is multiple and the L-shaped channel, the weight loss channel and the loop channel are alternately arranged in sequence on the heat exchange plate in a direction perpendicular to the L-shaped channel; and / or, the flow area of ​​the weight loss channel on the heat exchange plate is larger than the flow area of ​​the L-shaped channel.

[0013] In the preferred technical solution of the thermal management system for a battery pack, the L-shaped channel includes a connected evaporation channel and a condensation channel. The evaporation channel and the first tube segment are both provided on the first plate, and the condensation channel and the second tube segment are both provided on the second plate, wherein: the first tube segment includes a plurality of first U-shaped tubes, the second tube segment includes a plurality of second U-shaped tubes, the first U-shaped tubes and the second U-shaped tubes are connected end to end in sequence, and at least part of the evaporation channel of the L-shaped channel is provided on the inner side of the first U-shaped tube, and the condensation channel connected thereto is provided between two adjacent second U-shaped tubes; and / or, the evaporation channel of at least part of the L-shaped channel is arranged between two adjacent first U-shaped tubes and the condensation channel connected thereto is arranged on the inner side of the second U-shaped tube; and / or, the first tube section is bent and arranged on the first plate body to form a plurality of first U-shaped tubes connected end to end in sequence, the second tube section is bent and arranged on the second plate body to form a plurality of second U-shaped tubes connected end to end in sequence, the opening of the first U-shaped tube is arranged opposite to the opening of the second U-shaped tube, the evaporation channel of the L-shaped channel is arranged on the inner side of the first U-shaped tube and the condensation channel connected thereto is arranged on the inner side of the second U-shaped tube.

[0014] In the above-mentioned preferred technical solution of the thermal management system for the battery pack, the phase change heat pipe assembly also includes a regulating component, which is arranged between the first heat exchange end and the second heat exchange end and is used to regulate the flow rate of the phase change working medium flowing from the second heat exchange end to the first heat exchange end.

[0015] In a second aspect, the present invention also provides a control method for a thermal management system, wherein there are multiple battery packs, and the thermal management system includes multiple phase change heat pipe assemblies and liquid storage components arranged in a one-to-one correspondence with the battery packs, and the first heat exchange end of each phase change heat pipe assembly is used to exchange heat with the corresponding battery pack, and each liquid storage component is used to exchange heat with the second heat exchange end of the phase change heat pipe assembly corresponding to it. The control method includes the following steps: obtaining the current temperature Tn of each battery pack; determining the maximum temperature Tmax of the battery pack based on the current temperature Tn; comparing the maximum temperature Tmax with the first preset temperature T1; and selectively adjusting the working mode of each liquid storage component based on the comparison result; wherein n≥2.

[0016] In the preferred technical solution of the control method of the above-mentioned thermal management system, the step of "selectively adjusting the working mode of each of the liquid storage components according to the comparison result" specifically includes: if Tmax>T1, the liquid storage components corresponding to all battery packs are adjusted to the cooling mode; and / or, if Tmax≤T1, further determining the minimum temperature Tmin of the battery pack based on the current temperature Tn; determining the temperature difference △T based on the maximum temperature Tmax and the minimum temperature Tmin; comparing the maximum temperature Tmax with the second preset temperature T2 and the third preset temperature T3, respectively, and recording it as the first comparison result; comparing the temperature difference △T with the preset temperature difference △T0, and recording it as the second comparison result; selectively adjusting the working mode of each of the liquid storage components based on the first comparison result and the second comparison result; wherein, 0<T3<T2<T1.

[0017] In the preferred technical solution of the control method of the thermal management system, the step of "selectively adjusting the working mode of each of the liquid storage components according to the first comparison result and the second comparison result" specifically includes: if T2 < Tmax ≤ T1, and ΔT > ΔT0, then determining the battery pack to be cooled according to the current temperature Tn and the minimum temperature Tmin; adjusting the liquid storage component corresponding to the battery pack to be cooled to the cooling mode; and / or, if T2 < Tmax ≤ T1, and ΔT ≤ ΔT0, further obtaining the cooling liquid temperature Ty in the liquid storage cavity corresponding to each of the battery packs; judging the cooling liquid temperature of the liquid storage cavity whether the coolant temperature Ty in the battery is lower than the preset coolant temperature Ty0; selectively adjust the working mode of each of the liquid storage components according to the judgment result; and / or, if Tmax≤T2, and △T>△T0, determine the battery pack to be heated according to the current temperature Tn and the maximum temperature Tmax; adjust the liquid storage component corresponding to the battery pack to be heated to the heating mode; and / or, if T3<Tmax≤T2, and △T≤△T0, do not adjust the working mode of all the liquid storage components; and / or, if Tmax≤T3, and △T≤△T0, adjust all the liquid storage components to the heating mode.

[0018] In the preferred technical solution of the control method of the above-mentioned thermal management system, the step of “determining the battery pack to be cooled based on the current temperature Tn and the maximum temperature Tmin” specifically includes: comparing the current temperature Ti of the i-th battery pack with Tmin+△T0; if Ti≥Tmin+△T0, determining the i-th battery pack as the battery pack to be cooled; wherein, 0<i≤n; and / or, the step of “determining the battery pack to be heated based on the current temperature Tn and the maximum temperature Tmax” specifically includes: comparing the current temperature Tj of the j-th battery pack with Tmax-△T0; if Tj≤Tmax-△T0, determining the j-th battery pack as the battery pack to be heated; wherein, 0<j≤n.

[0019] In the preferred technical solution of the control method of the above-mentioned thermal management system, the step of "selectively adjusting the working mode of each of the liquid storage components according to the judgment result" specifically includes: if the judgment result is "yes", the working mode of the liquid storage component corresponding to the liquid storage cavity is not adjusted; and / or, if the judgment result is "no", the liquid storage component corresponding to the liquid storage cavity is adjusted to the cooling mode.

[0020] In the preferred technical solution of the control method of the above-mentioned thermal management system, when the judgment result is "no", the control method also includes the following steps: further comparing the maximum temperature Tmax with the fourth preset temperature T4 and the fifth preset temperature T5; based on the comparison result, determining the gear position of the liquid storage component to execute the cooling mode; wherein, 0<T2<T5<T4<T1.

[0021] In the preferred technical solution of the control method of the above-mentioned thermal management system, the step of "determining the gear position of the liquid storage component to execute the cooling mode based on the comparison result" specifically includes: if T4<Tmax≤T1, the gear position of the liquid storage component to execute the cooling mode is adjusted to the first preset gear position; if T5<Tmax≤T4, the gear position of the liquid storage component to execute the cooling mode is adjusted to the second preset gear position; if T2<Tmax≤T5, the gear position of the liquid storage component to execute the cooling mode is adjusted to the third preset gear position; wherein, the cooling capacity of the first preset gear is greater than the cooling capacity of the second preset gear, and the cooling capacity of the second preset gear is greater than the cooling capacity of the third preset gear.

[0022] In the preferred technical solution of the control method of the above-mentioned thermal management system, the thermal management system also includes a spraying mechanism, which is arranged in a one-to-one correspondence with the liquid storage chamber and can spray the coolant in the liquid storage chamber onto the battery pack corresponding thereto. The thermal management system is also configured to issue a thermal runaway alarm when thermal runaway occurs in the battery pack. The control method of the present invention also includes the following steps: obtaining the thermal runaway alarm level of the battery pack; and selectively controlling each of the spraying mechanisms to spray the battery pack corresponding thereto according to the alarm level.

[0023] In the preferred technical solution of the control method of the above-mentioned thermal management system, the step of "selectively controlling each of the spray mechanisms to spray the corresponding battery pack according to the alarm level" specifically includes: if the alarm level is a first preset level, controlling each of the spray mechanisms to spray the corresponding battery pack; if the alarm level is a second preset level, further determining whether the location of the thermal runaway battery pack can be determined; based on the determination result, selectively controlling each of the spray mechanisms to spray the corresponding battery pack; wherein, the degree of thermal runaway of the first preset level is greater than the degree of thermal runaway of the second preset level.

[0024] In the preferred technical solution of the control method of the above-mentioned thermal management system, the step of "selectively controlling each of the spray mechanisms to spray the corresponding battery pack according to the judgment result" specifically includes: if the judgment result is "no", then controlling each of the spray mechanisms to spray the corresponding battery pack; and / or, if the judgment result is "yes", then controlling a set number of the spray mechanisms around the thermal runaway battery pack to spray the corresponding battery packs.

[0025] In a third aspect, the present invention further provides an energy storage system, comprising the thermal management system for a battery pack described in any one of the first aspects and a controller, wherein the controller is configured to be able to execute the control method of the thermal management system described in any one of the second aspects.

[0026] Under the circumstance of adopting the above-mentioned preferred technical scheme, the present invention can perform thermal management of the battery pack through the phase change heat pipe assembly, reduce the energy consumption of thermal management, and by providing a liquid storage chamber and storing coolant in the liquid storage chamber, the coolant in the liquid storage chamber can exchange heat with the second heat exchange end to cool down or heat the second heat exchange end, thereby facilitating cooling or heating the battery pack. By arranging the temperature detection component to be communicatively connected with the liquid storage component, on the one hand, when the temperature in the battery pack is too high, the coolant can be cooled by the liquid storage component to cool the battery pack, and on the other hand, when the temperature in the battery pack is too low, the coolant can be heated by the liquid storage component to heat the battery pack, making the thermal management system more intelligent in thermal management of the battery pack.

[0027] Furthermore, by providing a spray mechanism and providing a liquid storage chamber and storing coolant in the liquid storage chamber, when the battery pack is working normally, heat can be exchanged between the coolant in the liquid storage chamber and the second heat exchange end to cool or heat the second heat exchange end, thereby facilitating cooling or heating the battery pack. When thermal runaway occurs in the battery pack, the coolant in the liquid storage component can also be sprayed onto the battery pack through the spray mechanism, thereby cooling and extinguishing the thermally runaway battery pack.

[0028] Furthermore, by configuring the phase change heat pipe assembly to include an L-shaped heat pipe and a loop heat pipe, when the battery pack is in a high temperature environment, the battery pack is cooled by the L-shaped heat pipe, and the first heat exchange end of the L-shaped heat pipe absorbs the heat of the battery pack, and causes the phase change medium to evaporate and flow to the second heat exchange end. The liquid phase change medium at the second heat exchange end can flow back to the first heat exchange end under the action of gravity, continuously cooling the battery pack without driving the phase change medium to flow; when the battery pack is in a low temperature environment, the battery pack can be heated with the help of the loop heat pipe, which makes up for the disadvantage that the L-type heat pipe cannot heat the battery pack against gravity. Moreover, when cooling the battery pack, compared with the single heat pipe form, the L-type heat pipe and the loop heat pipe can also serve as backup for each other to avoid the inability to perform thermal management of the battery pack due to failure.

[0029] Furthermore, by providing a bending plate, the phase-change medium at the second heat exchange end can flow smoothly to the first heat exchange end through the bending channel on the bending plate under the action of gravity, avoiding the phase-change medium from being retained between the first plate body and the second plate body, thereby ensuring the heat exchange stability of the heat pipe assembly; by providing a bending avoidance hole on the bending plate, the annular pipeline can be allowed to pass through the bending avoidance hole after passing through the first channel, so that the phase-change medium at the second heat exchange end of the loop heat pipe can flow smoothly to the first heat exchange end, and the number of loop channels is set to at least two, which can ensure that the annular pipeline is connected end to end to form a circulation loop.

[0030] Furthermore, by setting the number of L-shaped channels and loop channels to multiple, the L-shaped channels and loop channels can cover the entire area of ​​the heat exchange plate as much as possible, making the heat exchange temperature on the heat exchange plate more uniform. In addition, by alternately arranging the L-shaped channels and loop channels on the heat exchange plate in a direction perpendicular to the L-shaped channels, when the L-shaped heat pipe or the loop heat pipe works alone, the heat exchange in each area on the heat exchange plate can be made as uniform as possible, thereby improving the thermal management effect of the battery pack.

[0031] Furthermore, by providing a protruding structure in the L-shaped channel, the contact area between the inner wall of the L-shaped channel and the phase change medium is increased, so that the interaction between the inner wall of the L-shaped channel and the liquid phase change medium is enhanced, which can increase the flow rate of the phase change medium in the L-shaped channel, and thereby increase the rate at which the phase change medium reaches the second heat exchange end from the first heat exchange end to release heat and then returns to the first heat exchange end to absorb heat, which is beneficial to improving the overall cooling effect of the battery pack.

[0032] Furthermore, by arranging a capillary wick structure in the L-shaped channel, the gaseous phase change medium and the liquid phase change medium in the L-shaped channel can flow in different channels respectively, thereby facilitating gas-liquid separation of the phase change medium and improving the heat exchange effect. At the same time, the liquid channel is arranged to be distributed at intervals along the circumference of the gas channel, which can make the liquid channel closer to the tube wall (lower temperature), which is more conducive to the condensation of the phase change medium, and make the gas channel farther away from the tube wall (higher temperature), which can better prevent the gaseous phase change medium from condensing, thereby further improving the heat exchange capacity of the phase change heat pipe assembly.

[0033] Furthermore, by providing a weight-reducing channel, on the one hand, the weight of the heat exchange plate can be reduced, thereby contributing to a lightweight design of the energy storage system. On the other hand, the weight-reducing channel can also be used to separate the L-shaped channel and the loop channel, thereby preventing the phase change media in the L-shaped channel and the loop channel from being affected by each other and affecting the heat exchange effect.

[0034] Furthermore, by providing an adjusting component between the first heat exchange end and the second heat exchange end, the flow rate of the phase change medium flowing from the second heat exchange end to the first heat exchange end can be adjusted, thereby adjusting the heat exchange amount of the phase change heat exchange device, thereby avoiding excessive cooling of the battery pack. In addition, when the external ambient temperature is high, it can also prevent the second heat exchange end from absorbing heat from the surrounding environment and releasing the heat to the first heat exchange end, thereby preventing the battery pack from being overheated.

[0035] In addition, the present invention further provides a control method for a thermal management system based on the above-mentioned thermal management system for a battery pack. Since it includes the thermal management system for a battery pack introduced above, it has the beneficial effects of the above-mentioned thermal management system for a battery pack. In addition, by comparing the maximum temperature with the first preset temperature and selectively adjusting the working mode of each liquid storage component according to the comparison result, it can avoid the battery pack temperature being too high, which may cause the battery pack to cause thermal runaway, thereby improving the safety of the battery pack thermal management, and can also avoid excessive temperature differences between the battery packs, thereby improving the thermal management effect of the battery pack.

[0036] In addition, the energy storage system further provided by the present invention on the basis of the above-mentioned thermal management system for battery packs includes the above-mentioned thermal management system for battery packs, and thus has the beneficial effects of the above-mentioned thermal management system for battery packs. The energy storage system of the present invention is safer, has lower thermal management energy consumption, and has better thermal management effect on battery packs. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which: Figure 1 1 is a schematic diagram of the three-dimensional structure of a battery pack and a thermal management system for a battery pack according to one embodiment of the present invention; Figure 2 yes Figure 1 The schematic diagram of the structure after the liquid storage component and the spray mechanism are hidden; Figure 3 1 is a schematic structural diagram of another embodiment of a battery pack and a thermal management system for a battery pack according to the present invention; Figure 4 FIG1 is a schematic structural diagram of another embodiment of a thermal management system for a battery pack according to the present invention, wherein the schematic structural diagram shows the structure after the liquid storage component and the spray mechanism are hidden; Figure 5 1 is a schematic structural diagram of one embodiment of a heat exchange plate of the present invention; Figure 6 yes Figure 5 The cross-sectional view along line CC in FIG. 1 shows a schematic diagram of the internal structure of one embodiment of the heat exchange plate; Figure 7 yes Figure 5 A cross-sectional view along line CC in FIG. 1 shows a schematic diagram of the internal structure of another embodiment of a heat exchange plate; Figure 8 yes Figure 7 A partial enlarged schematic diagram of point D in the middle; Figure 9 It is a schematic internal cross-sectional structural diagram of another embodiment of the heat exchange plate of the present invention; Figure 10 This is a schematic structural diagram of a heat exchange plate and phase change heat pipe assembly according to one embodiment of the present invention; Figure 11 is a structural schematic diagram of a heat exchange plate and phase change heat pipe assembly according to another embodiment of the present invention; Figure 12 1 is a structural schematic diagram of a heat exchange plate and phase change heat pipe assembly according to another embodiment of the present invention; Figure 13 1 is a schematic structural diagram of a right side view of another embodiment of a thermal management system for a battery pack according to the present invention; Figure 14 is a flow chart of a control method of a thermal management system of the present invention; Figure 15 is a flow chart of an embodiment of a method for controlling a thermal management system of the present invention.

[0038] List of reference numerals: 1. Battery pack; 21. First heat exchange end; 22. Second heat exchange end; 23. Liquid wick; 24. Evaporator; 25. Annular pipe; 251. First pipe section; 252. Second pipe section; 3. Liquid storage component; 31. Liquid storage chamber; 32. Coolant; 331. Nozzle; 332. Spray pipe; 333. Pump body; 334. Spray valve; 335. Branch pipe; 336. Control valve; 34. Radiator; 4. Heat exchange plate; 40. Accommodation space; 4 1. First plate; 411. Evaporation channel; 412. First channel; 42. Second plate; 421. Condensation channel; 422. Second channel; 43. Bending plate; 431. Bending channel; 432. Bending avoidance hole; 44. L-shaped channel; 45. Loop channel; 46. Weight reduction channel; 471. Gas channel; 472. Liquid channel; 473. Hole; 48. Raised structure; 5. Box cover; 6. Adjusting member; 7. Liquid reservoir. DETAILED DESCRIPTION

[0039] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0040] It should be noted that, in the description of the present invention, terms such as "upper," "lower," "inner," and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. These are merely for ease of description and are not intended to indicate or imply that the device or component described must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "installed," "installed," and "connected" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0042] Based on the problem mentioned in the background art that the existing thermal management system for battery packs has poor thermal management effect due to high energy consumption and low safety of use, the present invention provides a thermal management system for battery packs in a first aspect.

[0043] Specifically, if Figures 1 to 4 As shown, the thermal management system for the battery pack 1 of the present invention includes a phase change heat pipe assembly and a liquid storage component 3. The phase change heat management assembly encapsulates a phase change working medium. The phase change heat pipe assembly has a first heat exchange end 21 and a second heat exchange end 22. The first heat exchange end 21 is arranged adjacent to the battery pack 1 and is used to exchange heat with the battery pack 1.

[0044] The liquid storage component 3 has a liquid storage cavity 31 , in which coolant 32 is stored. At least a portion of the second heat exchange end 22 is immersed in the coolant 32 and exchanges heat with the coolant 32 .

[0045] The liquid storage component 3 has a heating mode and a cooling mode. The liquid storage component 3 is configured to heat the coolant 32 when it is in the heating mode and to cool the coolant 32 when it is in the cooling mode. The thermal management system also includes a temperature detection component (not shown in the figure). The temperature detection component is used to detect the temperature inside the battery pack 1. The temperature detection component is communicatively connected with the liquid storage component 3 so that the liquid storage component 3 can selectively heat or cool the coolant 32 according to the detection data of the temperature detection component.

[0046] Through such a setting, the battery pack 1 can be thermally managed through the phase change heat pipe assembly to reduce the thermal management energy consumption. By setting up a liquid storage chamber 31 and storing the coolant 32 in the liquid storage chamber 31, the coolant 32 in the liquid storage chamber 31 can exchange heat with the second heat exchange end 22 to cool or heat the second heat exchange end 22, thereby facilitating the cooling or heating of the battery pack 1. By setting the temperature detection component to be communicatively connected with the liquid storage component 3, on the one hand, when the temperature in the battery pack 1 is too high, the coolant 32 can be cooled by the liquid storage component 3 to cool the battery pack 1. On the other hand, when the temperature in the battery pack 1 is too low, the coolant 32 can be heated by the liquid storage component 3 to heat the battery pack 1, making the thermal management system more intelligent in thermal management of the battery pack 1.

[0047] It should be noted that, in actual applications, the present invention does not impose any restrictions on the specific configuration type of the liquid storage member 3, as long as it can store the coolant 32 and immerse at least a portion of the second heat exchange end 22 in the coolant 32. For example, the liquid storage member 3 can be configured as a liquid storage tank, or as a liquid storage barrel, or as a liquid storage pool, etc. Such adjustments and changes to the specific configuration type of the liquid storage member 3 do not deviate from the principles and scope of the present invention and should be included in the scope of protection of the present invention.

[0048] Exemplarily, the liquid storage member 3 is a liquid storage tank.

[0049] It should be noted that, in actual applications, the present invention does not impose any restrictions on the specific type of coolant 32, as long as it can exchange heat with the second heat exchange end 22 and extinguish fires and cool the battery pack 1. For example, those skilled in the art may configure the coolant 32 to be water, or a mixture of water and ethylene glycol, or any other possible type. Such adjustments and changes to the specific type of coolant 32 do not deviate from the principles and scope of the present invention and are intended to be included within the scope of protection of the present invention.

[0050] In some embodiments, the cooling liquid 32 is water.

[0051] In other specific embodiments, the coolant 32 is a mixture of water and ethylene glycol.

[0052] It should be noted that, in actual applications, the entire second heat exchange end 22 can be immersed in the coolant 32, or a portion of the second heat exchange end 22 can be immersed in the coolant 32, and so on. Such flexible adjustments and changes do not deviate from the principles and scope of the present invention and should be included in the protection scope of the present invention.

[0053] Exemplarily, a portion of the second heat exchange end 22 is immersed in the coolant 32 .

[0054] It should be noted that, in actual applications, those skilled in the art may set the temperature detection component to a temperature sensor or a thermometer, or may set the temperature detection component to an infrared sensor, etc. Such adjustments and changes to the specific setting type of the temperature detection component do not deviate from the principles and scope of the present invention and should be included in the protection scope of the present invention.

[0055] Preferably, the temperature detection member is a temperature sensor provided in the battery pack 1 .

[0056] Preferably, the liquid storage component 3 further includes a heating element and a cooling element, wherein the heating component is used to heat the cooling liquid 32 and the cooling element is used to cool the cooling liquid 32, wherein the temperature detection component is communicatively connected with the heating element and the cooling element.

[0057] It should be noted that the present invention does not impose any restrictions on the specific setting type of the heating element, as long as it can heat the coolant 32 in the liquid storage chamber 31. For example, the heating element can be set as an electric heater, or the heating element can be set as an electromagnetic heating coil, etc. Such adjustments and changes to the specific setting type of the heating element do not deviate from the principles and scope of the present invention and should be included in the protection scope of the present invention.

[0058] Preferably, the heating element is an electric heater.

[0059] It should be noted that the present invention does not impose any restrictions on the specific setting type of the cooling element, as long as it can cool the coolant 32 in the liquid storage chamber 31. For example, the cooling element can be set as a semiconductor refrigeration element, or the cooling element can be set to include a compressor, a condenser and an evaporator 24, and the evaporator 24 is used to cool the coolant 32. Alternatively, the cooling element can be set as a radiator 34 and a cooling fan, etc. Such adjustments and changes to the specific setting type of the cooling element do not deviate from the principles and scope of the present invention and should be included in the protection scope of the present invention.

[0060] Exemplarily, the cooling element includes a radiator 34 and a cooling fan (not shown in the figure).

[0061] It should be noted that, in actual applications, those skilled in the art may configure the radiator 34 to be integrally arranged with the outer wall of the liquid storage component 3, or may configure the radiator 34 to be fixedly connected to the outer wall of the liquid storage component 3, or may configure the radiator 34 to be adhesively connected to the outer wall of the liquid storage component 3 via thermally conductive adhesive, and so on. Such adjustments and changes to the specific connection method between the radiator 34 and the liquid storage component 3 do not deviate from the principle and scope of the present invention, and should be included in the protection scope of the present invention.

[0062] Preferably, the radiator 34 is integrally provided with the liquid storage member 3 .

[0063] It should be noted that, in actual applications, those skilled in the art may configure the radiator 34 to have straight fins, or may configure the radiator 34 to have wavy fins, or may configure the radiator 34 to have any other possible form, etc. Such flexible adjustments and changes do not deviate from the principles and scope of the present invention and should be included in the scope of protection of the present invention.

[0064] Preferably, if Figure 1 As shown, the heat sink 34 has straight fins.

[0065] Preferably, if Figure 1 and Figure 3 As shown, the thermal management system of the present invention further includes a spraying mechanism, which is configured to spray the coolant 32 in the liquid storage chamber 31 onto the battery pack 1.

[0066] Through such a setting, the battery pack 1 can be thermally managed through the phase change heat pipe assembly to reduce the energy consumption of thermal management. By setting up a liquid storage chamber 31 and storing coolant 32 in the liquid storage chamber 31, on the one hand, the coolant 32 in the liquid storage chamber 31 can exchange heat with the second heat exchange end 22 to cool or heat the second heat exchange end 22, thereby facilitating the cooling or heating of the battery pack 1. On the other hand, when thermal runaway occurs in the battery pack 1, the coolant 32 in the liquid storage component 3 can also be sprayed onto the battery pack 1 through the spray mechanism, thereby cooling and extinguishing the thermally runaway battery pack 1.

[0067] In this way, the thermal management energy consumption of the thermal management system can be reduced, and fire water can be stored, avoiding the construction of a fire water pool in the energy storage system, reducing the construction cost of the energy storage system, and saving the construction space of the energy storage system.

[0068] Preferably, if Figure 1 and Figure 3 As shown, the spray mechanism of the present invention includes a nozzle 331, a spray pipe 332 and a pump body 333 arranged on the spray pipe 332. One end of the spray pipe 332 is connected to the nozzle 331, and the other end of the spray pipe 332 is connected to the liquid storage chamber 31. The pump body 333 is used to transport the coolant 32 in the liquid storage chamber 31 to the nozzle 331.

[0069] Through such a setting, when the battery cells in the battery pack 1 experience thermal runaway, the coolant 32 in the liquid storage chamber 31 can be transported to the nozzle 331 with the help of the pump body 333, and sprayed onto the battery pack 1 through the nozzle 331 to cool the battery pack 1 or extinguish the fire, prevent the thermal runaway of the battery cells from worsening, and improve the thermal management safety of the battery pack 1.

[0070] It should be noted that, in actual applications, those skilled in the art do not impose any restrictions on the specific setting type of the pump body 333. For example, the pump body 333 can be set as a suction pump body 333, or the pump body 333 can be set as a booster pump, etc. Such adjustments and changes to the specific setting type of the pump body 333 do not deviate from the principle and scope of the present invention, and should be included in the protection scope of the present invention.

[0071] Illustratively, the pump body 333 is a booster pump.

[0072] It should be noted that, in actual applications, the on-off of the spray pipe 332 can be controlled by controlling the start and stop of the pump body 333, or a spray valve 334 can be provided on the spray pipe 332 to control the on-off of the spray pipe 332, and so on. Such flexible adjustments and changes do not deviate from the principles and scope of the present invention and should be included in the protection scope of the present invention.

[0073] Preferably, if Figure 1 As shown, a spray valve 334 is provided on the spray pipe 332 , and the spray valve 334 is used to control the on and off of the spray pipe 332 .

[0074] It should be noted that, in actual applications, the present invention does not impose any restrictions on the specific location of the nozzle 331, as long as it can spray the coolant 32 onto the battery pack 1. For example, the nozzle 331 can be located above the battery pack 1, or on the side of the battery pack 1, or both above and on the side of the battery pack 1, etc. Such adjustments and changes to the specific location of the nozzle 331 do not deviate from the principles and scope of the present invention, as long as the coolant 32 can be sprayed onto the battery pack 1.

[0075] Preferably, if Figure 1 and Figure 3 As shown, the nozzle 331 is arranged above the battery pack 1 .

[0076] It should be noted that, in actual applications, those skilled in the art may set the number of nozzles 331 to only one, or may set the number of nozzles 331 to two, or may set the number of nozzles 331 to multiple, and so on. Such adjustments and changes to the specific setting number of nozzles 331 do not deviate from the principles and scope of the present invention, and should be included in the protection scope of the present invention.

[0077] Preferably, if Figure 3 As shown, there are multiple nozzles 331 and the multiple nozzles 331 are distributed above the battery pack 1 at intervals.

[0078] By providing a plurality of nozzles 331 , the spraying area of ​​the spraying mechanism can be increased, thereby more effectively spraying the battery pack 1 that is in thermal runaway.

[0079] It should be noted that, in actual applications, those skilled in the art can directly set multiple nozzles 331 on the spray pipe 332, or, can set multiple branches 335, each branch 335 is provided with a nozzle 331 and a control valve 336, and so on. Such flexible adjustment and change does not deviate from the principle and scope of the present invention, and should be included in the protection scope of the present invention.

[0080] Preferably, if Figure 3 As shown, the spray mechanism includes a plurality of branch pipes 335, each branch pipe 335 is provided with a nozzle 331 and a control valve 336, and the spray mechanism also includes a detection element (not shown in the figure), which is used to detect the position of thermal runaway of the battery pack 1, wherein the detection element is communicatively connected with the control valve 336 so as to adjust the opening and closing of the control valve 336 on each branch pipe 335 according to the detection result of the detection element.

[0081] By setting up a detection component, the specific location where the battery cell in the battery pack 1 has thermal runaway can be detected, so that the battery cell in thermal runaway can be accurately found. By setting the detection component to be connected to the controller for communication, the nozzle 331 located above the thermal runaway battery cell can be accurately caused to spray water towards the thermal runaway battery cell based on the detection result of the detection component.

[0082] It should be noted that, in actual applications, those skilled in the art may set the detection element to a temperature detection sensor located inside the battery pack 1, or may set the detection element to an infrared temperature sensor, or may set the detection element to any other possible form, etc. Such adjustments and changes to the specific setting type of the detection element do not deviate from the principles and scope of the present invention and should be included in the protection scope of the present invention.

[0083] Preferably, the detection element is a temperature detection sensor provided in the battery pack 1 .

[0084] Next see Figure 4 and Figure 5 The thermal management system of the present invention also includes a heat exchange plate 4 and a box cover 5. The heat exchange plate 4 includes a first plate body 41 and a second plate body 42 connected to each other. The box cover 5 is connected to the first plate body 41 to form an accommodating space 40. The battery pack 1 is arranged in the accommodating space 40. The phase change heat pipe assembly is arranged on the heat exchange plate 4, the first heat exchange end 21 is formed on the first plate body 41, the second heat exchange end 22 is formed on the second plate body 42, and at least a portion of the second plate body 42 is immersed in the coolant, wherein the phase change heat pipe assembly includes an L-shaped heat pipe and / or a loop heat pipe.

[0085] By such an arrangement, that is, by forming the first heat exchange end 21 on the first plate 41 and the second heat exchange end 22 on the second plate 42, the temperatures of the first heat exchange end 21 and the second heat exchange end 22 can be made more uniform, thereby avoiding affecting the thermal management effect of the battery pack 1 due to local overcooling or overheating of the first heat exchange end 21 or the second heat exchange end 22. In addition, by providing the box cover 5, the box cover 5 can be connected to the first plate 41 to form a accommodating space 40 for accommodating the battery pack 1, thereby protecting the battery pack 1.

[0086] It should be noted that, in actual applications, those skilled in the art may configure the phase-change heat pipe assembly to include only L-type heat pipes, or may configure the phase-change heat pipe assembly to include only loop heat pipes, or may configure the phase-change heat pipe assembly to include L-type heat pipes and loop heat pipes, and so on. Such adjustments and changes to the specific setting types of the phase-change heat pipe assembly do not deviate from the principles and scope of the present invention and should be included within the scope of protection of the present invention.

[0087] Preferably, the phase-change heat pipe assembly includes an L-shaped heat pipe and a loop heat pipe.

[0088] Through such a setting, that is, by setting the phase change heat pipe assembly to include an L-shaped heat pipe and a loop heat pipe, when the battery pack 1 is in a high temperature environment, the battery pack 1 is cooled by the L-shaped heat pipe, and the first heat exchange end 21 of the L-shaped heat pipe absorbs the heat of the battery pack 1, and causes the phase change medium to evaporate and flow to the second heat exchange end 22. The liquid phase change medium at the second heat exchange end 22 can flow back to the first heat exchange end 21 under the action of gravity, and continuously cool the battery pack 1 without driving the phase change medium to flow; when the battery pack 1 is in a low temperature environment, the battery pack 1 can be heated with the help of the loop heat pipe, which makes up for the disadvantage that the L-type heat pipe cannot heat the battery pack 1 against gravity. Moreover, when cooling the battery pack 1, compared with the form of a single heat pipe, the L-type heat pipe and the loop heat pipe can also serve as backup for each other to avoid the inability to perform thermal management of the battery pack 1 due to a fault.

[0089] It should be noted that the present invention does not impose any restrictions on the specific arrangement of the L-shaped heat pipe on the heat exchange plate 4. For example, the L-shaped heat pipe can be arranged as an L-shaped pipeline fixed on the heat exchange plate 4, wherein the first phase change medium is encapsulated in the L-shaped pipeline, or the L-shaped heat pipe can be arranged to include an L-shaped channel 44 formed in the heat exchange plate 4 and the first phase change medium encapsulated in the L-shaped channel 44.

[0090] Preferably, if Figures 9 to 12 As shown, the L-shaped heat pipe is configured to include an L-shaped channel 44 formed in the heat exchange plate 4 and a first phase change medium encapsulated in the L-shaped channel 44 .

[0091] It should be noted that the present invention does not impose any limitation on the specific type of the first phase change medium filled in the L-shaped channel 44. For example, the first phase change medium can be set to water, methanol, ethanol, liquid ammonia, acetone, fluorinated hydrocarbons, alkanes, or a mixture of any two of the above, etc. Such adjustments and changes to the specific setting type of the first phase change medium do not deviate from the principles and scope of the present invention and should be included in the scope of protection of the present invention.

[0092] Exemplarily, the first phase-change working fluid is liquid ammonia.

[0093] Preferably, the filling rate of the first phase-change medium in the L-shaped channel 44 is 40% to 70%, wherein the filling rate is the ratio of the volume of the filled first liquid-phase medium to the total volume of the L-shaped heat pipe.

[0094] It should be noted that the filling rate of the first phase change fluid can be set to 40%, 45%, 50%, 55%, 60%, 65%, 70%, or a range consisting of any two thereof. In some embodiments, the filling rate of the first phase change fluid is 40% to 70%.

[0095] It should be noted that, in actual applications, those skilled in the art do not impose any restrictions on the specific arrangement of the loop heat pipe on the heat exchange plate 4. For example, the loop heat pipe can be arranged to include an annular pipe 25, in which a second phase-change medium is encapsulated, and a heat exchange channel is provided on the heat exchange plate 4, in which the annular pipe 25 is arranged to pass through the loop channel 45. Alternatively, the loop heat pipe can be arranged to be an annular pipe 25 formed on the heat exchange plate 4, in which a second phase-change medium is encapsulated, and so on. Such flexible adjustments and changes do not deviate from the principles and scope of the present invention and should be included in the protection scope of the present invention.

[0096] The loop heat pipe is introduced below in conjunction with the following two embodiments.

[0097] Example 1: like Figure 5 and Figure 9 As shown, a loop channel 45 is provided in the heat exchange plate 4, and the loop heat pipe includes a ring pipe 25, in which the second phase change medium is encapsulated. The ring pipe 25 is arranged in the loop channel 45, and the loop heat pipe is configured to drive the second phase change medium to circulate in the ring pipe 25.

[0098] It can be understood that compared with the L-type heat pipe, the structure of the loop heat pipe is relatively complex. By setting the loop heat pipe to include a ring pipe 25, and the ring pipe 25 is passed through the loop channel 45, the processing difficulty of the loop heat pipe can be reduced, and the assembly of the thermal management system can be facilitated.

[0099] It should be noted that the present invention does not impose any restrictions on the specific type of the second phase change working fluid filled in the annular pipeline 25. For example, the second phase change working fluid can be set to water, methanol, ethanol, liquid ammonia, acetone, fluorinated hydrocarbons, alkanes, or a mixture of any two of the above, etc. Such adjustments and changes to the specific setting type of the second phase change working fluid do not deviate from the principles and scope of the present invention and should be included in the scope of protection of the present invention.

[0100] Exemplarily, the second phase change working fluid is acetone.

[0101] Preferably, the filling rate of the second phase-change medium in the annular pipeline 25 is 50% to 70%, wherein the filling rate is the ratio of the volume of the filled second liquid-phase medium to the total volume of the annular pipeline 25 .

[0102] It should be noted that the filling rate of the second phase change fluid can be set to 50%, 55%, 60%, 65%, 70%, or a range consisting of any two thereof. In some embodiments, the filling rate of the second phase change fluid is 50% to 70%.

[0103] It should be noted that, in actual applications, those skilled in the art may configure the heat exchange plate 4 to include only the first plate body 41 and the second plate body 42, or may configure the heat exchange plate 4 to include the first plate body 41, the bent plate, and the second plate body 42 connected in sequence, and so on. Such adjustments and changes to the specific setting type of the heat exchange plate 4 do not deviate from the principles and scope of the present invention and should be included in the protection scope of the present invention.

[0104] Preferably, if Figure 5 and Figure 9 As shown, the heat exchange plate 4 also includes a bending plate 43 arranged between the first plate body 41 and the second plate body 42, and the L-shaped channel 44 includes an evaporation channel 411, a bending channel 431 and a condensation channel 421 connected in sequence, wherein the evaporation channel 411 is arranged in the first plate body 41, the bending channel 431 is arranged in the bending plate 43, and the condensation channel 421 is arranged in the second plate body 42.

[0105] By providing the bending plate 43, the phase-change medium at the second heat exchange end 22 can flow smoothly to the first heat exchange end 21 through the bending channel 431 on the bending plate 43 under the action of gravity, thereby avoiding the phase-change medium from being retained between the first plate body 41 and the second plate body 42, thereby ensuring the heat exchange stability of the heat pipe assembly.

[0106] Preferably, if Figure 5 and Figure 9 As shown, the loop channel 45 includes a first channel 412, a bending avoidance hole 432 and a second channel 422 arranged in a one-to-one correspondence, wherein the first channel 412 is arranged in the first plate body 41, the bending avoidance hole 432 is arranged in the bending plate 43, and the second channel 422 is arranged in the second plate body 42. The number of loop channels 45 is at least two.

[0107] By such an arrangement, that is, by providing a bending avoidance hole 432 on the bending plate 43, the annular pipeline 25 can be allowed to pass through the bending avoidance hole 432 after passing through the first channel 412 and then pass through the second channel 422, so that the phase change medium at the second heat exchange end 22 of the loop heat pipe can flow smoothly to the first heat exchange end 21. Setting the number of loop channels 45 to at least two can ensure that the annular pipeline 25 is connected end to end to form a circulation loop.

[0108] It should be noted that, in actual applications, those skilled in the art do not impose any limitation on the specific bending angle of the bending plate 43. For example, the bending angle of the bending plate 43 can be set to 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, or a range consisting of any two of the above. In some embodiments, the bending angle of the bending plate 43 is 90°-170°.

[0109] It should be noted that the present invention does not impose any limitation on the specific number of L-shaped channels 44. For example, the L-shaped channel 44 can be set to one, or the number of L-shaped channels 44 can be set to multiple, and so on. Such adjustments and changes to the specific number of L-shaped channels 44 do not deviate from the principles and scope of the present invention and should be included in the protection scope of the present invention.

[0110] It should also be noted that those skilled in the art may set the number of loop channels 45 to two, or may set the number of loop channels 45 to 2×N (where N ≥ 2 and N is a positive integer), etc. Such adjustments and changes to the specific number of loop channels 45 do not deviate from the principles and scope of the present invention and should be included in the scope of protection of the present invention.

[0111] Preferably, if Figure 5 and Figure 9 As shown, there are multiple L-shaped channels 44 and multiple loop channels 45 , wherein the L-shaped channels 44 and the loop channels 45 are alternately arranged on the heat exchange plate 4 along a direction perpendicular to the L-shaped channels 44 .

[0112] By setting the number of L-shaped channels 44 and loop channels 45 to be multiple, the L-shaped channels 44 and loop channels 45 can cover the entire area of ​​the heat exchange plate 4 as much as possible, so that the heat exchange temperature on the heat exchange plate 4 is more uniform. In addition, by alternately arranging the L-shaped channels 44 and loop channels 45 on the heat exchange plate 4 in a direction perpendicular to the L-shaped channels 44, when the L-shaped heat pipe or the loop heat pipe works alone, the heat exchange of each area on the heat exchange plate 4 can be made as uniform as possible, thereby improving the thermal management effect of the battery pack 1.

[0113] It should be noted that, in actual applications, those skilled in the art do not impose any restrictions on the specific setting form of the L-shaped channel 44. For example, the L-shaped channel 44 can be set as a hollow pipe, or a capillary core structure can be set in the L-shaped channel 44, etc. Such adjustments and changes to the specific setting type of the L-shaped channel 44 do not deviate from the principles and scope of the present invention and should be included in the protection scope of the present invention.

[0114] Preferably, a capillary wick structure is provided in the L-shaped channel 44 .

[0115] The following two situations are introduced.

[0116] Scenario 1: Preferably, if Figure 6 As shown, the capillary core structure includes a protrusion structure 48 arranged on the inner wall of the L-shaped channel 44. The protrusion structure 48 extends along the axial direction of the L-shaped channel 44. There are multiple protrusion structures 48 and the multiple protrusion structures 48 are arranged in sequence along the circumference of the L-shaped channel 44.

[0117] By providing the raised structure 48, the contact area between the inner wall of the L-shaped channel 44 and the phase change medium is increased, thereby enhancing the interaction between the inner wall of the L-shaped channel 44 and the liquid phase change medium. If the inner wall of the L-shaped channel 44 is infiltrated with the phase change medium, the liquid molecules will be subject to a stronger attraction from the solid molecules, resulting in a decrease in the molecular distance, forming an expansion trend, thereby promoting the spreading of the liquid along the wall. Since the L-shaped channel 44 contains a two-phase mixture of gas and liquid phase change medium, the liquid phase change medium has a tendency to flow along the inner wall of the L-shaped channel 44, causing the gaseous phase change medium to flow in the middle of the L-shaped channel 44. This arrangement can increase the flow rate of the phase change medium in the L-shaped channel 44, thereby increasing the rate at which the phase change medium reaches the second heat exchange end 22 from the first heat exchange end 21 to release heat and then returns to the first heat exchange end 21 to absorb heat, which is beneficial to improving the overall cooling effect of the battery pack 1.

[0118] Preferably, the dimension of the L-shaped channel 44 in the thickness direction of the heat exchange plate 4 is 8 mm. The thickness of the heat exchange plate 4 is 12 mm.

[0119] It should be noted that the present invention does not impose any limitation on the specific structural form of the protruding structure 48. For example, the cross-section of the protruding structure 48 can be set to an arc shape, or the cross-section of the protruding structure 48 can be set to a triangle shape, or the cross-section of the protruding structure 48 can be set to any other possible shape, etc. Such adjustments and changes to the specific structural form of the protruding structure 48 do not deviate from the principle and scope of the present invention and should be included in the protection scope of the present invention.

[0120] Preferably, if Figure 6 As shown, the cross section of the protruding structure 48 is arc-shaped.

[0121] Scenario 2: like Figure 7 and Figure 8As shown, the capillary wick structure includes a gas channel 471 and a liquid channel 472. Both the gas channel 471 and the liquid channel 472 extend along the length direction of the L-shaped channel 44. There are multiple liquid channels 472, and the multiple liquid channels 472 are distributed at circumferential intervals along the gas channel 471. The gas channel 471 and the liquid channel 472 are connected through the channel 473.

[0122] Through such an arrangement, the gaseous phase-change working medium and the liquid phase-change working medium in the L-shaped channel 44 can flow in different channels respectively, which is conducive to the gas-liquid separation of the phase-change working medium and improves the heat exchange effect. At the same time, the liquid channel 472 is arranged to be distributed at intervals along the circumference of the gas channel 471, which can make the liquid channel 472 closer to the tube wall (lower temperature), which is more conducive to the condensation of the phase-change medium, and make the gas channel 471 further away from the tube wall (higher temperature), which can better prevent the gaseous phase-change working medium from condensing, thereby further improving the heat exchange capacity of the phase-change heat pipe assembly.

[0123] It should be noted that although the present invention introduces the L-shaped heat pipe based on the above two situations, this is not restrictive, and any other possible configuration forms do not deviate from the principle and scope of the present invention.

[0124] It should also be noted that a capillary wick structure as described in Case 1 and Case 2 may also be provided in the annular pipeline 25 , which will not be described in detail here.

[0125] In some embodiments, a weight reduction channel 46 is further provided on the heat exchange plate 4. There are multiple weight reduction channels 46 and the L-shaped channel 44, the weight reduction channel 46 and the loop channel 45 are alternately arranged in sequence on the heat exchange plate 4 along a direction perpendicular to the L-shaped channel 44.

[0126] By such an arrangement, i.e., by providing the weight-reducing channel 46, on the one hand, the weight of the heat exchange plate 4 can be reduced, thereby contributing to a lightweight design of the energy storage system. On the other hand, the weight-reducing channel 46 can also be used to separate the L-shaped channel 44 and the loop channel 45, thereby preventing the phase change media in the L-shaped channel 44 and the loop channel 45 from being affected by each other and affecting the heat exchange effect.

[0127] It should be noted that, in actual applications, those skilled in the art may configure the weight-reducing channel 46 to be a long channel extending in the direction in which the L-shaped channel 44 extends, or may configure the weight-reducing channel 46 to be a plurality of short channels spaced apart in the direction in which the L-shaped channel 44 extends, or may configure the weight-reducing channel 46 to be a form in which the above-mentioned long channel and short channel coexist, and so on. Such adjustments and changes to the specific setting type of the weight-reducing channel 46 do not deviate from the principle and scope of the present invention, and should be included in the protection scope of the present invention.

[0128] Preferably, the weight-reducing channel 46 is a long channel extending along the direction in which the L-shaped channel 44 extends.

[0129] In some preferred embodiments, the weight-reducing channel 46 is a closed channel to prevent external foreign matter from entering the weight-reducing channel 46 and increasing the weight of the heat exchange plate 4 .

[0130] Preferably, if Figure 6 and Figure 7 As shown, the flow area of ​​the weight-reducing channel 46 on the heat exchange plate 4 is larger than the flow area of ​​the L-shaped channel 44. This effectively isolates the L-shaped channel 44 from the loop channel 45. This not only prevents the phase-change medium in the L-shaped channel 44 from undergoing a phase change due to the phase-change medium in the loop channel 45, thereby reducing the cooling effect of the battery pack 1, but also prevents the phase-change medium in the loop channel 45 from undergoing a phase change due to the phase-change medium in the L-shaped channel 44, thereby reducing the heating effect of the battery pack 1.

[0131] Example 2: like Figures 10 to 12 As shown, the loop heat pipe includes a first pipe section 251, a second pipe section 252 and a second phase-change working medium formed in the heat exchange plate 4. The first pipe section 251 and the second pipe section 252 are connected in sequence to form a ring pipeline 25. The second phase-change working medium is encapsulated in the ring pipeline 25. The loop heat pipe is configured to drive the second phase-change working medium to circulate in the ring pipeline 25.

[0132] Preferably, if Figures 10 to 12 As shown, the L-shaped channel 44 includes a connected evaporation channel 411 and a condensation channel 421 . The evaporation channel 411 and the first pipe section 251 are both arranged on the first plate 41 , and the condensation channel 421 and the second pipe section 252 are both arranged on the second plate 42 .

[0133] It should be noted that the present invention does not impose any limitation on the formation method of the L-shaped channel 44 and the annular pipeline 25 on the heat exchange plate 4 , as long as both the L-shaped channel 44 and the annular pipeline 25 are formed on the heat exchange plate 4 .

[0134] In a specific embodiment, Figure 10 and Figure 11 As shown, the first pipe section 251 includes a plurality of first U-shaped tubes, and the second pipe section 252 includes a plurality of second U-shaped tubes. The first U-shaped tubes and the second U-shaped tubes are connected end to end in sequence. The evaporation channel 411 of at least part of the L-shaped channel 44 is arranged on the inner side of the first U-shaped tube and the condensation channel 421 is arranged between two adjacent second U-shaped tubes; the evaporation channel 411 of at least part of the L-shaped channel 44 is arranged between two adjacent first U-shaped tubes and the condensation channel 421 connected thereto is arranged on the inner side of the second U-shaped tube.

[0135] In another specific embodiment, the first pipe section 251 includes a plurality of first U-shaped tubes, the second pipe section 252 includes a plurality of second U-shaped tubes, the first U-shaped tubes and the second U-shaped tubes are connected end to end in sequence, the evaporation channel 411 of the L-shaped channel 44 is arranged on the inner side of the first U-shaped tube and the condensation channel 421 is arranged between two adjacent second U-shaped tubes (not shown in the figure).

[0136] In another possible specific embodiment, the first pipe section 251 includes a plurality of first U-shaped tubes, the second pipe section 252 includes a plurality of second U-shaped tubes, the first U-shaped tubes and the second U-shaped tubes are connected end to end in sequence, and the evaporation channel 411 of the L-shaped channel 44 is arranged between two adjacent first U-shaped tubes and the condensation channel 421 connected thereto is arranged on the inner side of the second U-shaped tube (not shown in the figure).

[0137] In another possible embodiment, Figure 12 As shown, the first pipe section 251 is bent and arranged on the first plate body 41 to form a plurality of first U-shaped tubes connected end to end in sequence, the second pipe section 252 is bent and arranged on the second plate body 42 to form a plurality of second U-shaped tubes connected end to end in sequence, the opening of the first U-shaped tube is arranged opposite to the opening of the second U-shaped tube, the evaporation channel 411 of the L-shaped channel 44 is arranged on the inner side of the first U-shaped tube and the condensation channel 421 is arranged on the inner side of the second U-shaped tube.

[0138] It should be noted that, for the above-mentioned embodiment 1 and embodiment 2, the present invention does not impose any limitation on the specific driving method of the loop heat pipe driving the second phase-change working medium to circulate in the annular pipeline 25 .

[0139] In a specific embodiment, Figure 4 and Figure 11 As shown, the loop heat pipe also includes an evaporator 24. The two ends of the ring pipe 25 are respectively connected to the inlet and outlet of the evaporator 24 to form a circulation loop. The evaporator 24 is used to vaporize the phase change working medium to drive the phase change working medium to circulate in the circulation loop.

[0140] In another specific embodiment, Figure 10 and Figure 12 As shown, the loop heat pipe further includes a liquid wick 23 (not shown in the figure) disposed in the annular pipeline 25 . The liquid wick 23 is used to drive the second phase-change working medium to circulate in the annular pipeline 25 .

[0141] It should be noted that, in actual applications, the present invention does not impose any restrictions on the specific location of the wick 23, as long as it can drive the second phase change medium to circulate in the annular pipeline 25. For example, the wick 23 can be set on the entire pipeline of the annular pipeline 25, or the wick 23 can be set on only a part of the pipeline section of the annular pipeline 25, and so on. Such adjustments and changes to the specific location of the wick 23 do not deviate from the principles and scope of the present invention and should be included in the scope of protection of the present invention.

[0142] Preferably, the wick 23 is only provided on a partial section of the annular pipeline 25 .

[0143] It should be noted that the present invention does not impose any limitation on the specific structure of the liquid absorbent core 23. For example, the liquid absorbent core 23 can be configured to be a porous structure formed by a sintering process (pressurizing at high temperature to fuse the powder particles) of metal powder (such as copper, aluminum, nickel) or ceramic powder (such as alumina). Alternatively, the liquid absorbent core 23 can be configured to be formed by stacking and sintering multiple layers of metal mesh (such as copper mesh) to form a "mesh + sintered pore" structure. Alternatively, the liquid absorbent core 23 can be configured to be a nanostructure. For example, a nanoscale porous structure (such as a nanopore array, nanogrooves) is formed on the inner wall of the metal through processes such as anodizing and chemical etching. There is no limitation on the specific structure of the liquid absorbent core 23, as long as it can transport the liquid phase change working medium from the condensation end to the evaporation end.

[0144] It should be noted that although the present invention uses the above-mentioned several embodiments to introduce the formation methods of the L-shaped channel 44 and the annular pipeline 25 on the heat exchange plate 4, this is not restrictive. Any other possible formation methods do not deviate from the principles and scope of the present invention and should be included in the scope of protection of the present invention.

[0145] It should also be noted that the type and filling rate of the second phase change medium in Example 1 are applicable to Example 2, the L-shaped channel 44 in Example 1 is also applicable to Example 2, and the structural form of the heat exchange plate 4 in Example 1 is also applicable to Example 2, which will not be repeated here.

[0146] Preferably, if Figure 13 As shown, the phase-change heat pipe assembly further includes a regulating component 6 , which is disposed between the first heat exchange end 21 and the second heat exchange end 22 and is used to regulate the flow of the phase-change medium flowing from the second heat exchange end 22 to the first heat exchange end 21 .

[0147] By such a setting, that is, by arranging the regulating component 6 between the first heat exchange end 21 and the second heat exchange end 22, the flow rate of the phase change medium flowing from the second heat exchange end 22 to the first heat exchange end 21 can be adjusted, thereby adjusting the heat exchange amount of the phase change heat exchange device, thereby avoiding excessive cooling of the battery pack 1. In addition, when the external ambient temperature is high, it can also prevent the second heat exchange end 22 from absorbing heat from the surrounding environment and releasing the heat to the first heat exchange end 21, thereby preventing the battery pack 1 from being overheated.

[0148] It should be noted that, in actual applications, those skilled in the art may arrange the regulating member 6 between the evaporation channel 411 and the condensation channel 421 of the L-shaped heat pipe, or may arrange the regulating member 6 between the first pipe section 251 and the second pipe section 252 of the loop heat pipe, or may arrange the regulating member 6 simultaneously between the evaporation channel 411 and the condensation channel 421 of the L-shaped heat pipe and between the first pipe section 251 and the second pipe section 252 of the loop heat pipe, and so on. Such adjustments and changes to the specific setting position of the regulating member 6 do not deviate from the principle and scope of the present invention and should be included in the protection scope of the present invention.

[0149] Preferably, the regulating member 6 is disposed between the evaporation channel 411 and the condensation channel 421 of the L-shaped heat pipe and between the first pipe section 251 and the second pipe section 252 of the loop heat pipe.

[0150] It should be noted that, in actual applications, those skilled in the art may set the regulating component 6 as a regulating valve to adjust the flow rate of the phase-change medium flowing from the second heat exchange end 22 to the first heat exchange end 21 by adjusting the flow area or flow resistance of the phase-change medium, or may set the regulating component 6 as a high-frequency switching valve to adjust the flow rate of the phase-change medium flowing from the second heat exchange end 22 to the first heat exchange end 21 by adjusting the duty cycle of the opening state of the high-frequency switching valve, or may set the regulating component 6 as a diaphragm valve to adjust the flow rate of the phase-change medium flowing from the second heat exchange end 22 to the first heat exchange end 21 by adjusting the channel cross-sectional area of ​​the phase-change medium, or may set the regulating component 6 as a solenoid valve to adjust the flow rate of the phase-change medium flowing from the second heat exchange end 22 to the first heat exchange end 21 by adjusting the opening degree of the solenoid valve, and so on. Such flexible adjustment and change do not deviate from the principle and scope of the present invention and should be included in the protection scope of the present invention.

[0151] Preferably, if Figure 13 As shown, the phase-change heat pipe assembly further includes a liquid reservoir 7, which is disposed on a side of the regulating member 6 away from the first heat exchange end 21. The liquid reservoir 7 is configured to enable gas-liquid separation of the phase-change working medium to prevent the gaseous phase-change working medium from flowing from the second heat exchange end 22 to the first heat exchange end 21.

[0152] By providing the liquid reservoir 7, the phase change medium can be facilitated to separate gas and liquid. When the phase change medium flows from the second heat exchange end 22 to the first heat exchange end 21, the gaseous phase change medium can be prevented from flowing from the second heat exchange end 22 to the first heat exchange end 21 through the regulating component 6, thereby improving the regulation accuracy of the regulating component 6.

[0153] In a second aspect, the present invention further provides a control method for the thermal management system introduced in the first aspect.

[0154] Specifically, the thermal management system includes a plurality of phase change heat pipe assemblies and liquid storage components 3 arranged in one-to-one correspondence with the battery packs 1. The first heat exchange end 21 of each phase change heat pipe assembly is used to exchange heat with the corresponding battery pack 1, and each liquid storage component 3 is used to exchange heat with the second heat exchange end 22 of the phase change heat pipe assembly corresponding to it.

[0155] See also Figure 14 , the control method of the present invention comprises the following steps: S1: Get the current temperature Tn of each battery pack 1; S2: Determine the maximum temperature Tmax of the battery pack 1 based on the current temperature Tn; S3: Compare the maximum temperature Tmax with the first preset temperature T1; S4: selectively adjusting the working mode of each liquid storage component 3 according to the comparison result; Where n≥2.

[0156] Through such a setting, that is, by comparing the maximum temperature with the first preset temperature and selectively adjusting the working mode of each liquid storage component 3 according to the comparison result, it is possible to avoid the temperature of the battery pack 1 being too high, which may cause the battery pack 1 to cause thermal runaway, thereby improving the safety of the thermal management of the battery pack 1, and also avoid excessive temperature differences between the battery packs 1, thereby improving the thermal management effect of the battery pack 1.

[0157] It should be noted that when detecting the current temperature of each battery pack 1, only one detection point in each battery pack 1 can be detected as the current temperature, or multiple detection points in the battery pack 1 can be detected, and the current temperature can be determined based on the multiple detection values ​​detected, and so on. Such adjustments and changes to the number of detections in each battery pack 1 do not deviate from the principles and scope of the present invention, and should be included in the protection scope of the present invention.

[0158] Preferably, multiple detection points in the battery pack 1 are detected, and the current temperature is determined based on the multiple detection values ​​detected.

[0159] Specifically, the step of “determining the maximum temperature Tmax of the battery pack 1 according to the current temperature Tn” includes: Among the current temperatures of each battery pack 1 detected, the current temperature of the battery pack 1 with the highest temperature is selected as the maximum temperature Tmax.

[0160] Preferably, if Figure 15 As shown, the step of “selectively adjusting the working mode of each liquid storage member 3 according to the comparison result” specifically includes: S5 : If Tmax>T1 , the liquid storage members 3 corresponding to all the battery packs 1 are adjusted to the cooling mode.

[0161] With such a setting, when Tmax>T1, it means that the temperature of the battery pack 1 is relatively high. At this time, all the liquid storage components 3 are adjusted to the cooling mode, so that the coolant 32 can cool the second heat exchange end 22, thereby causing the phase change medium in the second heat exchange end 22 to condense, and the liquid phase change medium is transported to the evaporation end, and absorbs the heat of the battery pack 1 and evaporates, thereby effectively cooling the battery pack 1 and avoiding thermal runaway caused by the excessive temperature of the battery pack 1.

[0162] Specifically, the step of “adjusting the liquid storage members 3 corresponding to all battery packs 1 to the cooling mode” includes: The temperature-lowering element of the liquid storage member 3 corresponding to each battery pack 1 is activated.

[0163] Preferably, if Figure 15 As shown, the step of “selectively adjusting the working mode of each liquid storage member 3 according to the comparison result” specifically includes: S61: If Tmax≤T1, further determining the minimum temperature Tmin of the battery pack 1 based on the current temperature Tn; S62: Determine the temperature difference ΔT based on the maximum temperature Tmax and the minimum temperature Tmin; S63: Compare the maximum temperature Tmax with the second preset temperature T2 and the third preset temperature T3 respectively, and record them as the first comparison result; S64: Compare the temperature difference ΔT with the preset temperature difference ΔT0, and record it as a second comparison result; selectively adjusting the working mode of each liquid storage member 3 according to the first comparison result and the second comparison result; Among them, 0<T3<T2<T1.

[0164] Through such a setting, when Tmax≤T1, it means that the temperature of the battery pack 1 is not obviously too high. At this time, by comparing the maximum temperature with the second preset temperature T2 and the third preset temperature T3, and by comparing the temperature difference △T with the preset temperature difference △T0, and then selectively adjusting the working mode of each liquid storage component 3 according to the comparison result, it is possible to avoid excessive temperature deviations between the battery packs 1, thereby improving the temperature uniformity of the battery pack 1.

[0165] Specifically, the step of “determining the minimum temperature Tmin of the battery pack 1 according to the current temperature Tn” includes: Among the current temperatures of each battery pack 1 detected, the current temperature of the battery pack 1 with the lowest temperature is selected as the minimum temperature Tmin.

[0166] Preferably, the step of “determining the temperature difference ΔT according to the maximum temperature Tmax and the minimum temperature Tmin” specifically includes: The temperature difference △T is calculated according to the following formula: △T=Tmax-Tmin.

[0167] It should be noted that those skilled in the art can determine the first preset temperature T1 , the second preset temperature T2 , the third preset temperature T3 and the preset temperature difference ΔT0 based on experience or experiments.

[0168] Preferably, if Figure 15 As shown, the step of “selectively adjusting the working mode of each liquid storage member 3 according to the first comparison result and the second comparison result” specifically includes: S651: If T2 < Tmax ≤ T1, and ΔT > ΔT0, determine the battery pack to be cooled based on the current temperature Tn and the minimum temperature Tmin; S652: Adjust the liquid storage member 3 corresponding to the battery pack to be cooled to the cooling mode.

[0169] With such a setting, when T2<Tmax≤T1 and △T>△T0, it means that the maximum temperature of the battery pack 1 is relatively high and the temperature difference between each battery pack 1 is large. At this time, the battery packs to be cooled are screened out, and the liquid storage components 3 corresponding to the battery packs to be cooled are adjusted to the cooling mode. The battery packs 1 with relatively high temperatures can be cooled, thereby making the temperature of each battery pack 1 more uniform.

[0170] Preferably, the step of “determining the battery pack to be cooled based on the current temperature Tn and the minimum temperature Tmin” specifically includes: Compare the current temperature Ti of the i-th battery pack 1 with Tmin+△T0; If Ti≥Tmin+△T0, the i-th battery pack 1 is determined as the battery pack to be cooled; Among them, 0<i≤n.

[0171] With this setting, the current temperature Ti of each battery pack 1 is compared with Tmin+△T0. When Ti≥Tmin+△T0, it means that the temperature of this battery pack 1 is higher than the set battery pack temperature, that is, the deviation between the battery pack 1 and the set battery pack temperature is large. Therefore, the battery pack 1 is determined to be a battery pack to be cooled.

[0172] It should be noted that the method is not limited to determining the battery pack to be cooled in the above manner. For example, the battery pack 1 whose temperature exceeds the set battery pack temperature can also be determined as the battery pack to be cooled, and so on. Such flexible adjustments and changes do not deviate from the principles and scope of the present invention and should be included in the scope of protection of the present invention.

[0173] Preferably, if Figure 15 As shown, the step of “selectively adjusting the working mode of each liquid storage member 3 according to the first comparison result and the second comparison result” specifically includes: S661: If T2<Tmax≤T1, and ΔT≤ΔT0, then further obtain the coolant temperature Ty in the liquid storage cavity 31 corresponding to each battery pack 1; S662: Determine whether the coolant temperature Ty in the liquid storage chamber 31 is less than a preset coolant temperature Ty0; According to the judgment result, the operation mode of each liquid storage member 3 is selectively adjusted.

[0174] Through such a setting, when T2<Tmax≤T1, it means that the maximum temperature of the battery pack 1 is relatively high, and the temperature difference between each battery pack 1 is small, that is, the temperature of all battery packs 1 is relatively high, that is, all battery packs 1 need to be cooled. At this time, the coolant temperature Ty in the liquid storage cavity 31 corresponding to each battery pack 1 is further obtained, and it is judged whether the coolant temperature Ty in the liquid storage cavity 31 is less than the preset coolant temperature Ty0. According to the judgment result, the working mode of each liquid storage component 3 is selectively adjusted, which can avoid continuing to cool the coolant 32 when the coolant temperature is low, causing the temperature of the coolant 32 to be too low and then causing the temperature of the battery pack 1 to be too low, which helps to reduce the temperature difference between each battery pack 1.

[0175] Preferably, if Figure 15 The step of “selectively adjusting the working mode of each liquid storage member 3 according to the judgment result” specifically includes: S663: If the judgment result is "yes", the working mode of the liquid storage member 3 corresponding to the liquid storage chamber 31 is not adjusted; S664: If the judgment result is “No”, the liquid storage member 3 corresponding to the liquid storage chamber 31 is adjusted to the temperature reduction mode.

[0176] Through such a setting, when the judgment result is "yes", it means that the temperature of the coolant in the liquid storage chamber 31 is low. At this time, there is no need to adjust the liquid storage component 3 to the cooling mode, that is, the working mode of the liquid storage component 3 corresponding to the liquid storage chamber 31 is not adjusted; when the judgment result is "no", it means that the temperature of the coolant in the liquid storage chamber 31 is high. At this time, it is necessary to adjust the corresponding liquid storage component 3 to the cooling mode to cool the coolant 32, thereby cooling the corresponding battery pack 1 to avoid excessive temperature differences between each battery pack 1.

[0177] Preferably, when the judgment result is "no", the control method of the present invention further includes the following steps: further comparing the maximum temperature Tmax with the fourth preset temperature T4 and the fifth preset temperature T5; According to the comparison result, determining the gear position of the liquid storage component 3 to execute the cooling mode; Among them, T2<T5<T4<T1.

[0178] Through such a setting, when the judgment result is "no", it means that the coolant temperature Ty in the liquid storage chamber 31 is ≥ the preset coolant temperature Ty0. At this time, the maximum temperature Tmax is further compared with the fourth preset temperature T4 and the fifth preset temperature T5, and according to the comparison result, the gear position of the liquid storage component 3 to execute the cooling mode is determined. This can not only avoid the cooling efficiency being affected by the cooling gear being too low, thereby affecting the cooling efficiency of the battery pack 1, but also avoid the cooling range being too large due to the cooling gear being too high, thereby affecting the temperature control accuracy of the battery pack 1.

[0179] Preferably, the step of “determining the gear position of the liquid storage component 3 for executing the cooling mode according to the comparison result” specifically includes: If T4<Tmax≤T1, the gear position of the liquid storage member 3 in the cooling mode is adjusted to the first preset gear position; If T5<Tmax≤T4, the gear position of the liquid storage member 3 in the cooling mode is adjusted to the second preset gear position; If T2<Tmax≤T5, the gear position of the liquid storage member 3 in the cooling mode is adjusted to the third preset gear position; Among them, the cooling capacity of the first preset gear is greater than the cooling capacity of the second preset gear, and the cooling capacity of the second preset gear is greater than the cooling capacity of the third preset gear.

[0180] Through such a setting, the gear position of the liquid storage component 3 to execute the cooling mode can be determined according to the range of the maximum temperature of the battery pack 1, so that the second heat exchange end 22 can be cooled more accurately, and then the battery pack 1 can be cooled more accurately, avoiding excessive cooling range affecting the temperature control accuracy of the battery pack 1.

[0181] It should be noted that, in actual applications, the present invention does not impose any restrictions on the specific setting form of the cooling capacity of each preset gear. For example, the cooling frequency of the first preset gear can be set to be greater than the cooling frequency of the second preset gear, and the cooling frequency of the second preset gear can be set to be greater than the cooling frequency of the third preset gear. Alternatively, the speed of the first preset gear (such as the speed of the cooling fan) can be set to be greater than the speed of the second preset gear, and the speed of the second preset gear can be set to be greater than the speed of the third preset gear, and so on. Such flexible adjustment and change does not deviate from the principle and scope of the present invention and should be included in the protection scope of the present invention.

[0182] Exemplarily, the cooling frequency of the first preset gear is greater than the cooling frequency of the second preset gear, and the cooling frequency of the second preset gear is greater than the cooling frequency of the third preset gear. For example, the cooling frequency of the first preset gear is 100%, the cooling frequency of the second preset gear is 70%, and the cooling frequency of the third preset gear is 30%.

[0183] It should also be noted that those skilled in the art can determine the specific values ​​of the cooling capacity of the first preset gear, the cooling capacity of the second preset gear, the cooling capacity of the third gear, and the fourth preset temperature T4 and the fifth preset temperature T5 based on experience or experiments.

[0184] Preferably, if Figure 15 As shown, the step of “selectively adjusting the working mode of each liquid storage member 3 according to the first comparison result and the second comparison result” specifically includes: S671: If Tmax≤T2, and ΔT>ΔT0, determine the battery pack to be heated based on the current temperature Tn and the minimum temperature Tmax; S672: Adjust the liquid storage member 3 corresponding to the battery pack to be heated to the heating mode.

[0185] With such a setting, when Tmax≤T2 and ΔT>ΔT0, it means that the maximum temperature of the battery pack 1 is relatively low and the temperature difference between each battery pack 1 is large. At this time, only the battery packs 1 with lower temperatures are screened out as the battery packs to be heated, and the liquid storage components 3 corresponding to the battery packs to be cooled are adjusted to the heating mode. The battery packs 1 with relatively low temperatures can be heated, thereby making the temperatures of each battery pack 1 more uniform.

[0186] Preferably, the step of “determining the battery pack to be heated based on the current temperature Tn and the maximum temperature Tmax” specifically includes: Compare the current temperature Tj of the j-th battery pack 1 with Tmax-△T0; If Tj≤Tmax-△T0, the j-th battery pack 1 is determined as the battery pack to be heated; Among them, 0<j≤n.

[0187] Through such a setting, the current temperature of each battery pack 1 is compared with Tmax-△T0. If the current temperature of the battery pack 1 is ≤Tmax-△T0, it means that the current temperature of the battery pack 1 is significantly lower than the set temperature and needs to be heated. At this time, the battery pack 1 is determined to be a battery pack to be heated.

[0188] Preferably, if Figure 15 As shown, the step of “selectively adjusting the working mode of each liquid storage member 3 according to the first comparison result and the second comparison result” specifically includes: S68: If T3<Tmax≤T2, and ΔT≤ΔT0, the operation modes of all liquid storage components 3 are not adjusted.

[0189] Through such a setting, when T3<Tmax≤T2 and △T≤△T0, it means that the maximum temperature of the battery pack 1 is close to the set temperature of the battery pack 1, and the temperature deviation of each battery pack 1 is also small. In other words, all battery packs 1 are at a relatively suitable temperature. At this time, the working mode of all liquid storage components 3 is not adjusted, which can save energy and prevent the temperature difference of the battery pack 1 from becoming larger.

[0190] Preferably, if Figure 15 As shown, the step of “selectively adjusting the working mode of each liquid storage member 3 according to the first comparison result and the second comparison result” specifically includes: S69: If Tmax≤T3, and ΔT≤ΔT0, all liquid storage members 3 are adjusted to the heating mode.

[0191] With such a setting, when Tmax≤T3 and ΔT≤ΔT0, it indicates that the maximum temperature of the battery pack 1 is significantly lower and the temperature deviation between the battery packs 1 is not large, that is, the temperature of all the battery packs 1 is relatively low. At this time, all the liquid storage components 3 are adjusted to the heating mode to heat all the battery packs 1, thereby avoiding affecting the normal operation of the battery pack 1 due to the excessively low temperature of the battery pack 1.

[0192] Preferably, the thermal management system of the present invention further includes a spray mechanism, which is provided in a one-to-one correspondence with the liquid storage chamber 31 and is capable of spraying the coolant 32 in the liquid storage chamber 31 onto the corresponding battery pack 1. The thermal management system is further configured to issue a thermal runaway alarm when thermal runaway occurs in the battery pack 1. The control method of the present invention further includes the following steps: Get the thermal runaway alarm level of battery pack 1; According to the alarm level, each spray mechanism is selectively controlled to spray the corresponding battery pack 1 .

[0193] With such a setting, when the battery pack 1 experiences thermal runaway, the coolant 32 in the liquid storage component 3 can be sprayed onto the battery pack 1 through the spray mechanism, thereby cooling down and extinguishing the battery pack 1 in thermal runaway. In addition, the battery pack 1 can be sprayed according to the thermal runaway alarm level, and the battery pack 1 in thermal runaway can be accurately cooled down and extinguished, further improving the safety of the thermal management system.

[0194] Preferably, the step of “selectively controlling each spray mechanism to spray the corresponding battery pack 1 according to the alarm level” specifically includes: If the alarm level is the first preset level, each spray mechanism is controlled to spray the corresponding battery pack 1; If the alarm level is the second preset level, further determining whether the location of the thermal runaway battery can be determined; According to the judgment result, each spray mechanism is selectively controlled to spray the corresponding battery pack 1; The first preset level of thermal runaway degree is greater than the second preset level of thermal runaway degree.

[0195] Through such a setting, when the degree of thermal runaway is relatively serious, each spray mechanism is controlled to spray the corresponding battery pack 1, so that the thermal runaway battery pack 1 can be controlled more effectively to avoid the thermal runaway from worsening and causing a fire. When the degree of thermal runaway is relatively mild, each spray mechanism can be selectively controlled to spray the battery pack 1 according to whether the position of the thermal runaway battery can be determined, thereby preserving the batteries that have not experienced thermal runaway as much as possible while ensuring safety.

[0196] It should be noted that an alarm module can be set on the thermal management system. When the battery experiences thermal runaway, the alarm module sends an alarm level to obtain the alarm level. Alternatively, the alarm level can be obtained by comparing the picture taken by the camera with the preset picture. Alternatively, the alarm level can be obtained by comparing the detected temperature of the battery pack 1 with the set temperature, and so on. Such adjustments and changes to the specific method of obtaining the alarm level do not deviate from the principle and scope of the present invention and should be included in the protection scope of the present invention.

[0197] Preferably, the step of “selectively controlling each spray mechanism to spray the corresponding battery pack 1 according to the judgment result” specifically includes: If the judgment result is "no", each spray mechanism is controlled to spray the corresponding battery pack 1; If the judgment result is “yes”, a set number of spray mechanisms around the thermal runaway battery pack 1 are controlled to spray the corresponding battery packs 1 .

[0198] Through such a setting, when the judgment result is "no", it means that the precise position of the thermal runaway battery pack 1 cannot be determined. At this time, each spray mechanism is controlled to spray the corresponding battery pack 1, which can control the thermal runaway battery and prevent the thermal runaway from worsening and causing a fire; when the judgment result is "yes", only a set number of spray mechanisms around the thermal runaway battery pack 1 are controlled to spray the corresponding battery packs 1, which can control the thermal runaway battery pack 1 and prevent the thermal runaway from worsening and causing a fire, and can also preserve the battery packs 1 farther away from the thermal runaway battery pack 1 to reduce losses.

[0199] It should be noted that, in actual applications, the present invention does not impose any limitation on the specific numerical value of the set number. For example, the set number can be set to one, that is, the spray mechanism of one battery pack 1 around the thermal runaway battery pack 1 is controlled to spray the corresponding battery pack 1. Alternatively, the set number can be set to two, that is, the spray mechanisms of two battery packs 1 around the thermal runaway battery pack 1 are controlled to spray the corresponding battery packs 1. Alternatively, the set number can be set to any other possible numerical value.

[0200] Exemplarily, the set number is set to two, that is, the spraying mechanisms of the two battery packs 1 around the thermal runaway battery pack 1 are controlled to spray the battery packs 1 corresponding thereto.

[0201] In a third aspect, the present invention also provides an energy storage system, which includes a thermal management system and a controller for a battery pack 1 introduced in any one of the first aspects, and the controller is configured to be able to execute the control method of the thermal management system introduced in any one of the second aspects.

[0202] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A thermal management system for a battery pack (1), characterized in that: The thermal management system comprises a battery pack (1), a phase-change heat pipe assembly, and a liquid storage component (3), wherein a phase-change working medium is encapsulated in the phase-change heat pipe assembly, the phase-change heat pipe assembly having a first heat exchange end (21) and a second heat exchange end (22), the first heat exchange end (21) being arranged adjacent to the battery pack (1) and being used for performing heat exchange with the battery pack (1), the liquid storage component (3) having a liquid storage cavity (31) for storing a coolant (32), at least a portion of the second heat exchange end (22) being immersed in the coolant (32) and performing heat exchange with the coolant (32), The liquid storage member (3) has a heating mode and a cooling mode. The liquid storage member (3) is configured to heat the cooling liquid (32) when in the heating mode and to cool the cooling liquid (32) when in the cooling mode. The thermal management system further comprises a temperature detection component, the temperature detection component is used to detect the temperature inside the battery pack (1), and the temperature detection component is communicatively connected to the liquid storage component (3).

2. The thermal management system for a battery pack (1) according to claim 1, characterized in that: The liquid storage component (3) further comprises a heating element and a cooling element, wherein the heating element is used to heat the cooling liquid (32) and the cooling element is used to cool the cooling liquid (32), wherein the temperature detection component is communicatively connected with the heating element and the cooling element; And / or, the thermal management system further comprises a spraying mechanism, wherein the spraying mechanism is configured to spray the cooling liquid (32) in the liquid storage chamber (31) onto the battery pack (1).

3. The thermal management system for a battery pack (1) according to claim 2, characterized in that: The spray mechanism comprises a nozzle (331), a spray pipe (332), and a pump body (333) arranged on the spray pipe (332); one end of the spray pipe (332) is connected to the nozzle (331), and the other end of the spray pipe (332) is connected to the liquid storage chamber (31); the pump body (333) is used to transport the cooling liquid (32) in the liquid storage chamber (31) to the nozzle (331).

4. The thermal management system for a battery pack (1) according to claim 1, characterized in that: The thermal management system further comprises a heat exchange plate (4) and a box cover (5), wherein the heat exchange plate (4) comprises a first plate body (41) and a second plate body (42) connected to each other, the box cover (5) is connected to the first plate body (41) to form an accommodating space (40), the battery pack (1) is arranged in the accommodating space (40), the phase change heat pipe assembly is arranged on the heat exchange plate (4), the first heat exchange end (21) is formed on the first plate body (41), the second heat exchange end (22) is formed on the second plate body (42), and at least a portion of the second plate body (42) is immersed in the coolant; Wherein, the phase change heat pipe assembly includes an L-shaped heat pipe and / or a loop heat pipe.

5. The thermal management system for a battery pack (1) according to claim 4, characterized in that: The phase-change heat pipe assembly comprises an L-shaped heat pipe and a loop heat pipe, wherein the L-shaped heat pipe comprises an L-shaped channel (44) formed in the heat exchange plate (4) and a first phase-change working medium encapsulated in the L-shaped channel (44), wherein: A loop channel (45) is provided in the heat exchange plate (4), the loop heat pipe comprises a loop pipe (25) and a second phase-change working medium encapsulated in the loop pipe (25), the loop pipe (25) is passed through the loop channel (45), and the loop heat pipe is configured to drive the second phase-change working medium to circulate in the loop pipe (25); Alternatively, the loop heat pipe comprises a first pipe section (251), a second pipe section (252), and a second phase-change working medium formed in the heat exchange plate (4); the first pipe section (251) and the second pipe section (252) are sequentially connected to form an annular pipeline (25); the second phase-change working medium is encapsulated in the annular pipeline (25); and the loop heat pipe is configured to drive the second phase-change working medium to circulate in the annular pipeline (25).

6. The thermal management system for a battery pack (1) according to claim 5, characterized in that: The loop heat pipe further comprises an evaporator (24), and both ends of the annular pipeline (25) are respectively connected to the inlet and outlet of the evaporator (24) to form a circulation loop, and the evaporator (24) is used to gasify the phase-change working medium to drive the phase-change working medium to circulate in the circulation loop; And / or, the loop heat pipe further comprises a liquid wick (23) arranged in the loop pipeline (25), the liquid wick (23) being used to drive the second phase-change working medium to circulate in the loop pipeline (25); And / or, the filling rate of the first phase-change working medium in the L-shaped channel (44) is 40% to 70%; And / or, the filling rate of the second phase-change working medium in the annular pipeline (25) is 50% to 70%.

7. The thermal management system for a battery pack (1) according to claim 5, characterized in that: The heat exchange plate (4) further includes a bent plate (43) arranged between the first plate body (41) and the second plate body (42), wherein: The L-shaped channel (44) comprises an evaporation channel (411) provided in the first plate body (41), a bending channel (431) provided in the bending plate (43), and a condensation channel (421) provided in the second plate body (42); And / or, the loop channel (45) includes a first channel (412), a bending avoidance hole (432), and a second channel (422) arranged in a one-to-one correspondence, the first channel (412) is arranged in the first plate body (41), the bending avoidance hole (432) is arranged on the bending plate (43), and the second channel (422) is arranged in the second plate body (42), and the number of the loop channels (45) is at least two; And / or, the number of the L-shaped channel (44) and the number of the loop channel (45) are both plural, and the L-shaped channel (44) and the loop channel (45) are alternately arranged on the heat exchange plate (4) in a direction perpendicular to the L-shaped channel (44); And / or, a capillary wick structure is provided in the L-shaped channel (44), the capillary wick structure comprising a protrusion structure (48) provided on the inner wall of the L-shaped channel (44), the protrusion structure (48) extending along the axial direction of the L-shaped channel (44), the number of the protrusion structures (48) being multiple, and the multiple protrusion structures (48) being sequentially arranged along the circumference of the L-shaped channel (44); or, the capillary wick structure comprising a gas channel (471) and a liquid channel (472), the gas channel (471) and the liquid channel (472) both extending along the length direction of the L-shaped channel (44), the number of the liquid channels (472) being multiple, and the multiple liquid channels (472) being spaced apart along the circumference of the gas channel (471), and the gas channel (471) and the liquid channel (472) being connected via a hole (473); And / or, the heat exchange plate (4) is further provided with a weight reduction channel (46), the number of the weight reduction channels (46) is plural, and the L-shaped channel (44), the weight reduction channel (46), and the loop channel (45) are alternately arranged in sequence on the heat exchange plate (4) along a direction perpendicular to the L-shaped channel (44); And / or, the flow area of ​​the weight-reducing channel (46) on the heat exchange plate (4) is greater than the flow area of ​​the L-shaped channel (44).

8. The thermal management system for a battery pack (1) according to claim 5, characterized in that: The L-shaped channel (44) comprises a connected evaporation channel (411) and a condensation channel (421); the evaporation channel (411) and the first pipe section (251) are both arranged on the first plate body (41); the condensation channel (421) and the second pipe section (252) are both arranged on the second plate body (42); wherein: The first pipe section (251) includes a plurality of first U-shaped tubes, and the second pipe section (252) includes a plurality of second U-shaped tubes, the first U-shaped tubes and the second U-shaped tubes are connected end to end in sequence, and at least a portion of the evaporation channel (411) of the L-shaped channel (44) is arranged on the inner side of the first U-shaped tube, and the condensation channel (421) connected thereto is arranged between two adjacent second U-shaped tubes; and / or, at least a portion of the evaporation channel (411) of the L-shaped channel (44) is arranged between two adjacent first U-shaped tubes, and the condensation channel (421) connected thereto is arranged on the inner side of the second U-shaped tube; And / or, the first pipe section (251) is bent on the first plate body (41) to form a plurality of first U-shaped tubes connected end to end in sequence, the second pipe section (252) is bent on the second plate body (42) to form a plurality of second U-shaped tubes connected end to end in sequence, the opening of the first U-shaped tube is arranged opposite to the opening of the second U-shaped tube, the evaporation channel (411) of the L-shaped channel (44) is arranged on the inner side of the first U-shaped tube, and the condensation channel (421) connected thereto is arranged on the inner side of the second U-shaped tube.

9. A thermal management system for a battery pack (1) according to any one of claims 1 to 8, characterized in that: The phase-change heat pipe assembly further comprises a regulating member (6), which is arranged between the first heat exchange end (21) and the second heat exchange end (22) and is used to regulate the flow of the phase-change working medium flowing from the second heat exchange end (22) to the first heat exchange end (21).

10. A control method for a thermal management system according to any one of claims 1 to 9, characterized in that: There are multiple battery packs (1), and the thermal management system includes multiple phase-change heat pipe assemblies and liquid storage components (3) arranged in a one-to-one correspondence with the battery packs (1). The first heat exchange end (21) of each phase-change heat pipe assembly is used to perform heat exchange with the corresponding battery pack (1), and each liquid storage component (3) is used to perform heat exchange with the second heat exchange end (22) of the corresponding phase-change heat pipe assembly. The control method includes the following steps: Obtaining the current temperature Tn of each battery pack (1); Determining the maximum temperature Tmax of the battery pack (1) based on the current temperature Tn; Comparing the maximum temperature Tmax with the first preset temperature T1; selectively adjusting the working mode of each liquid storage component (3) according to the comparison result; Where n≥2.

11. The control method of the thermal management system according to claim 10, characterized in that: The step of "selectively adjusting the working mode of each liquid storage member (3) according to the comparison result" specifically includes: If Tmax>T1, the liquid storage components (3) corresponding to all battery packs (1) are adjusted to a cooling mode; and / or, if Tmax≤T1, further determining the minimum temperature Tmin of the battery pack (1) based on the current temperature Tn; Determining a temperature difference ΔT according to the maximum temperature Tmax and the minimum temperature Tmin; Comparing the maximum temperature Tmax with the second preset temperature T2 and the third preset temperature T3 respectively, and recording them as first comparison results; Comparing the temperature difference ΔT with a preset temperature difference ΔT0, and recording the result as a second comparison; selectively adjusting the working mode of each liquid storage component (3) according to the first comparison result and the second comparison result; Among them, 0<T3<T2<T1.

12. The control method of the thermal management system according to claim 11, characterized in that: The step of "selectively adjusting the working mode of each liquid storage component (3) according to the first comparison result and the second comparison result" specifically includes: If T2<Tmax≤T1, and ΔT>ΔT0, then determining the battery pack to be cooled according to the current temperature Tn and the minimum temperature Tmin; Adjusting the liquid storage component (3) corresponding to the battery pack to be cooled to a cooling mode; and / or, if T2<Tmax≤T1, and ΔT≤ΔT0, then further obtaining the coolant temperature Ty in the liquid storage cavity (31) corresponding to each of the battery packs (1); Determining whether the coolant temperature Ty in the liquid storage chamber (31) is less than a preset coolant temperature Ty0; Selectively adjusting the working mode of each liquid storage component (3) according to the judgment result; and / or, if Tmax≤T2, and ΔT>ΔT0, determining a battery pack to be heated based on the current temperature Tn and the maximum temperature Tmax; Adjusting the liquid storage component (3) corresponding to the battery pack to be heated to a heating mode; and / or, if T3<Tmax≤T2, and ΔT≤ΔT0, then the working modes of all the liquid storage components (3) are not adjusted; And / or, if Tmax≤T3, and ΔT≤ΔT0, all of the liquid storage components (3) are adjusted to a heating mode.

13. The control method of the thermal management system according to claim 12, characterized in that: The step of “determining the battery pack to be cooled according to the current temperature Tn and the maximum temperature Tmin” specifically includes: Compare the current temperature Ti of the i-th battery pack (1) with Tmin+ΔT0; If Ti≥Tmin+△T0, the i-th battery pack (1) is determined as the battery pack to be cooled; Among them, 0<i≤n; And / or, the step of “determining a battery pack to be heated based on the current temperature Tn and the maximum temperature Tmax” specifically includes: Comparing the current temperature Tj of the j-th battery pack (1) with Tmax-ΔT0; If Tj≤Tmax-△T0, the j-th battery pack (1) is determined as the battery pack to be heated; Among them, 0<j≤n.

14. The control method of the thermal management system according to claim 12, characterized in that: The step of "selectively adjusting the working mode of each liquid storage component (3) according to the judgment result" specifically includes: If the judgment result is "yes", the working mode of the liquid storage component (3) corresponding to the liquid storage cavity (31) is not adjusted; And / or, if the judgment result is "no", the liquid storage component (3) corresponding to the liquid storage chamber (31) is adjusted to a cooling mode.

15. The control method of the thermal management system according to claim 14, characterized in that: When the judgment result is "no", the control method further includes the following steps: further comparing the maximum temperature Tmax with a fourth preset temperature T4 and a fifth preset temperature T5; According to the comparison result, determining the gear position of the liquid storage component (3) in the cooling mode; Among them, 0<T2<T5<T4<T1.

16. The control method of the thermal management system according to claim 15, characterized in that: The step of "determining the gear position of the liquid storage component (3) in the cooling mode according to the comparison result" specifically includes: If T4<Tmax≤T1, the gear position of the liquid storage component (3) in the cooling mode is adjusted to a first preset gear position; If T5<Tmax≤T4, the gear position of the liquid storage component (3) in the cooling mode is adjusted to a second preset gear position; If T2<Tmax≤T5, the gear position of the liquid storage component (3) in the cooling mode is adjusted to a third preset gear position; The cooling capacity of the first preset gear is greater than that of the second preset gear, and the cooling capacity of the second preset gear is greater than that of the third preset gear.

17. The control method of a thermal management system according to claim 10, characterized in that: The thermal management system further comprises a spray mechanism, which is arranged in a one-to-one correspondence with the liquid storage chamber (31) and is capable of spraying the coolant (32) in the liquid storage chamber (31) onto the corresponding battery pack (1). The thermal management system is further configured to issue a thermal runaway alarm when thermal runaway occurs in the battery pack (1). The control method of the present invention further comprises the following steps: Obtaining a thermal runaway alarm level of the battery pack (1); According to the alarm level, each of the spraying mechanisms is selectively controlled to spray the battery pack (1) corresponding thereto.

18. The control method of the thermal management system according to claim 17, characterized in that: The step of "selectively controlling each of the spraying mechanisms to spray the corresponding battery pack (1) according to the alarm level" specifically includes: If the alarm level is the first preset level, controlling each of the spraying mechanisms to spray the battery pack (1) corresponding thereto; If the alarm level is the second preset level, further determining whether the location of the thermal runaway battery pack (1) can be determined; According to the judgment result, each of the spraying mechanisms is selectively controlled to spray the corresponding battery pack (1); The first preset level of thermal runaway degree is greater than the second preset level of thermal runaway degree.

19. The control method of the thermal management system according to claim 18, characterized in that: The step of "selectively controlling each of the spraying mechanisms to spray the corresponding battery pack (1) according to the judgment result" specifically includes: If the judgment result is "no", each of the spraying mechanisms is controlled to spray the corresponding battery pack (1); And / or, if the judgment result is "yes", a set number of spray mechanisms around the thermal runaway battery pack (1) are controlled to spray the corresponding battery pack (1).

20. An energy storage system, characterized in that: The energy storage system comprises a thermal management system for a battery pack (1) according to any one of claims 1 to 9 and a controller, wherein the controller is configured to be able to execute a control method for the thermal management system according to any one of claims 10 to 19.

Images