Control method of thermal management system of energy storage system and energy storage system

Abstract

The invention relates to a control method of a thermal management system of an energy storage system and the energy storage system, and belongs to the technical field of energy storage, the energy storage system comprises a first liquid cooling unit and a second liquid cooling unit which are connected in parallel, and a first valve and a second valve, and the first liquid cooling unit and the second liquid cooling unit are respectively connected with a plurality of battery clusters in parallel. The control method of the thermal management system of the energy storage system comprises the following steps: when the highest temperature tmax of a current energy storage system cell is less than or equal to 25 DEG C and the maximum temperature difference tdmax of the current energy storage system cell is greater than or equal to 5 DEG C, judging and positioning a battery cluster where the highest temperature cell is located, opening each first valve, controlling a water pump of a first liquid cooling unit to work, and controlling a second liquid cooling unit to work; and a second valve correspondingly connected with the battery cluster where the highest-temperature battery cell is located is opened, the second liquid cooling unit operates at the power W, the thermal management system is made to be in a single-machine self-adaptive refrigeration mode, the overtemperature risk of other battery clusters except the battery cluster where the highest-temperature battery cell is located is reduced, and temperature equalization of the energy storage system is achieved.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, in particular to a control method for a thermal management system of an energy storage system and an energy storage system. Background Art

[0002] Existing energy storage systems include a thermal management system and multiple battery packs. These battery packs are connected in series or parallel with an energy storage inverter and other ancillary facilities to form an independently operable assembly, known as a battery cluster. The thermal management system includes a liquid cooling unit, liquid cooling piping, and valves. The liquid cooling unit is connected to the liquid cooling piping, and each battery cluster is connected to the liquid cooling piping via a valve. By adjusting the opening of certain valves, the flow of coolant flowing through different battery clusters is adjusted, enabling the liquid cooling unit to rapidly cool certain battery clusters that require rapid cooling. However, adjusting certain valves changes the flow of coolant flowing through other battery clusters connected to the corresponding unadjusted valves, causing the temperature of these other battery clusters to rise, leading to large temperature differences within the energy storage system. Summary of the Invention

[0003] The present application provides a control method for a thermal management system of an energy storage system and an energy storage system, which are used to solve the problem of large temperature differences within the energy storage system.

[0004] In a first aspect, the present application provides a control method for a thermal management system of an energy storage system. The thermal management system includes at least: a first liquid cooling unit, a second liquid cooling unit, multiple liquid cooling pipelines, and multiple first and second valves. The first and second liquid cooling units are respectively connected in parallel with multiple battery clusters of the energy storage system via the multiple liquid cooling pipelines. The first valve is connected between the first liquid cooling unit and the water inlets of the multiple battery clusters of the energy storage system. The second valve is connected between the second liquid cooling unit and another water inlet of the multiple battery clusters of the energy storage system. The first and second liquid cooling units are connected in parallel. The control method of the thermal management system of the energy storage system comprises at least the following steps: Get the maximum temperature t of the battery cell in the current energy storage system max , and determining the current state of the thermal management system; Determine the maximum temperature t of the battery cell in the current energy storage system max Whether it meets: 25℃<t max <37℃; When the maximum temperature of the battery cell in the current energy storage system is t max Not satisfied: 25℃<t max When the temperature is less than 37℃, continue to judge the maximum temperature of the battery cell in the energy storage system t max Is it satisfied: t max ≤25℃; When the maximum temperature of the battery cell in the current energy storage system is t max When ≤25℃, calculate the maximum temperature difference t of the battery cells in the current energy storage system dmax , and determine the maximum temperature difference t of the battery cells in the current energy storage system dmax Is it satisfied: t dmax <5℃; When the maximum temperature difference of the battery cells in the current energy storage system is t dmax When the temperature is ≥5°C, the battery cluster where the battery cell with the highest temperature in the energy storage system is located is determined and located, all first valves are opened, the water pump of the first liquid cooling unit is controlled to operate, at least the second valve connected to the battery cluster where the battery cell with the highest temperature is located is opened, and the second liquid cooling unit is operated at a power of W, so that the thermal management system is in a single-machine adaptive cooling mode.

[0005] In this solution, the maximum temperature of the battery cell in the current energy storage system is t max ≤25℃, and the maximum temperature difference of the battery cells in the current energy storage system is t dmax When the temperature is ≥5°C, the thermal management system is controlled to operate in a single-unit adaptive cooling mode. This mode opens the second valve connected to the battery cluster where the cell with the highest temperature is located and activates the compressor of the water pump of the second liquid cooling unit, allowing the second liquid cooling unit to operate at a cooling power of W. Consequently, the second liquid cooling unit can rapidly cool the battery cluster where the cell with the highest temperature is located, reducing the temperature difference between the battery cluster where the cell with the highest temperature is located and the battery clusters other than the cell with the highest temperature, thereby maintaining the energy storage system in an optimal operating state. At the same time, all first valves are opened, and the water pump of the first liquid cooling unit is activated, so that coolant provided by the first liquid cooling unit flows through each battery cluster in the energy storage system. This ensures accelerated cooling of the battery cluster where the cell with the highest temperature is located while ensuring that coolant flows through the battery clusters other than the cell with the highest temperature. This prevents excessive fluctuations in the temperature of the battery clusters other than the cell with the highest temperature, reducing the risk of overheating in the battery clusters other than the cell with the highest temperature, and achieving rapid temperature equalization of the energy storage system.

[0006] In summary, the thermal management system is in a single-machine adaptive cooling mode, which is mainly used to reduce the temperature difference of the battery clusters in the energy storage system. The thermal management system is provided with a first liquid cooling unit and a second liquid cooling unit in parallel. The second cooling unit can independently and quickly cool the battery cluster where the battery cell with the highest temperature is located. At the same time, the first liquid cooling unit is used to provide coolant for all battery clusters in the energy storage system, and can relatively balance the flow rate flowing through the battery cluster where the battery cell with the highest temperature is located and the battery clusters other than the battery cluster where the battery cell with the highest temperature is located. That is, after opening the corresponding second valve, it will not affect the flow rate of coolant flowing through the battery clusters other than the battery cluster where the battery cell with the highest temperature is located, so that the temperature fluctuations of the battery clusters other than the battery cluster where the battery cell with the highest temperature is located will not be too large, so that the battery devices of the energy storage system can quickly and accurately equalize the temperature.

[0007] In this solution, the control method of the thermal management system of the energy storage system further includes: When the maximum temperature of the battery cell in the current energy storage system is t max Satisfaction: 25℃<t max When the temperature is less than 37℃, continue to determine the maximum temperature difference t of the battery cells in the current energy storage system. dmax Is it satisfied: t dmax <5℃; When the maximum temperature difference of the battery cells in the current energy storage system is t dmax When the temperature is ≥5°C, the battery cluster where the battery cell with the highest temperature is located is determined and located, all the first valves are opened, the water pumps and compressors of the first liquid cooling unit and the second liquid cooling unit are controlled to operate, at least the second valve connected to the battery cluster where the battery cell with the highest temperature is located is opened, and the first liquid cooling unit operates at a power of M and the second liquid cooling unit operates at a power of W, so that the thermal management system is in a dual-machine adaptive cooling mode.

[0008] In this solution, the control method of the thermal management system of the energy storage system further includes: When the maximum temperature of the battery cell in the current energy storage system is t max Not satisfied: 25℃<t max When the temperature is less than 37℃, continue to judge the maximum temperature of the battery cell in the energy storage system t max Is it satisfied: t max ≤25℃; When judging the maximum temperature t of the battery cell in the current energy storage system max When the temperature is ≥25℃, continue to determine the maximum temperature difference t of the battery cells in the current energy storage system. dmax Is it satisfied: t dmax <5℃; When the maximum temperature difference of the battery cells in the current energy storage system is t dmaxWhen the temperature is ≥5°C, the battery cluster where the battery cell with the highest temperature is located is determined and located, all the first valves are opened, the water pumps and compressors of the first liquid cooling unit and the second liquid cooling unit are controlled to operate, at least the second valve connected to the battery cluster where the battery cell with the highest temperature is located is opened, and the first liquid cooling unit operates at a power of M and the second liquid cooling unit operates at a power of W, so that the thermal management system is in a dual-machine adaptive cooling mode.

[0009] In this solution, the control method of the thermal management system of the energy storage system further includes: calculating the average temperature t of all battery cells in the current energy storage system. mean , and according to the formula: , calculate the maximum temperature difference t of the battery cells in the current energy storage system dmax .

[0010] In this solution, when the thermal management system is in the dual-machine adaptive cooling mode or the single-machine adaptive cooling mode, at time K2 t rmax Not equal to t max When , the control method of the thermal management system of the energy storage system further includes: according to the formula: , calculate the maximum temperature difference t of the battery cells in the energy storage system dmax1 ; Among them, t mean is the average temperature of all cells in the current energy storage system, t rmax The current maximum temperature of the battery cell in the battery cluster where the battery cell with the highest temperature in the energy storage system is located at the K1 moment, and at the K1 moment t rmax Equal to t max .

[0011] In this solution, when it is determined that the thermal management system needs to be in the single-machine adaptive cooling mode or the dual-machine adaptive cooling mode, the control method of the thermal management system of the energy storage system further includes: When judging the maximum temperature difference t of the battery cells in the current energy storage system dmax Satisfaction: t sn ≤t dmax ≤t fn When the second liquid cooling unit is powered by W n Run and continue to determine the maximum temperature difference t of the battery cells in the current energy storage system dmax Is it satisfied: t dmax <t sn ; When the maximum temperature difference of the battery cells in the current energy storage system is t dmax <t sn When the second liquid cooling unit is controlled to have a power of W n-k Run and continue to determine the maximum temperature difference t of the battery cells in the current energy storage system dmax Is it satisfied: t dmax <tsn-k ; or, when the maximum temperature difference of the battery cells in the current energy storage system is t dmax Still satisfied: t sn ≤t dmax ≤t fn When the second liquid cooling unit is controlled to still operate at power W n Continue running; When judging the maximum temperature difference t of the battery cells in the current energy storage system dmax <t sn-k , and satisfy t dmax When the minimum preset temperature difference is not reached, the second liquid cooling unit is controlled to operate at a power of W n-k-1 run; When judging the maximum temperature difference t of the battery cells in the current energy storage system dmax <t sn-k , and satisfy t dmax When the minimum preset temperature difference is reached, the second liquid cooling unit is controlled to stop working; When judging t fn-k ≥t dmax ≥t sn-k When the second liquid cooling unit is controlled to still operate at power W n-k run; Among them, satisfy: t fn >t sn >t fn-k >t sn-k , and W n >W n-k >W n-k-1 , n is a positive integer greater than 1, and k is a positive integer ≥ 1 and less than n.

[0012] In this solution, when k is equal to 1, it satisfies: 1℃<t sn -t sn-k <2.5℃, and / or, 1℃<t fn -t fn-k <2.5℃.

[0013] In this solution, when it is determined that the thermal management system needs to be in the dual-machine adaptive cooling mode, the control method of the thermal management system of the energy storage system further includes: Determine the maximum temperature t of the battery cell in the current energy storage system max Satisfaction: t an ≤t max ≤t bn When the first liquid cooling unit is powered by M n Run and continue to judge the maximum temperature t of the battery cell in the current energy storage system max Is it satisfied: t max <t an ; When judging the maximum temperature t of the battery cell in the current energy storage systemmax <t an When the first liquid cooling unit is controlled to have a power of M n-k Run, continue to judge t max Is it satisfied: t max <t an-k ;or, When judging the maximum temperature t of the battery cell in the current energy storage system max Satisfaction: t an ≤t max ≤t bn When the first liquid cooling unit is controlled to still operate at power M n run; When judging the maximum temperature t of the battery cell in the current energy storage system max <t an-k , and satisfy t max When the minimum set temperature is not reached, the first liquid cooling unit is controlled to operate at power M n-k-1 run; When judging the maximum temperature t of the battery cell in the current energy storage system max <t an-k , and satisfy t max When the minimum set temperature is reached, the first liquid cooling unit is controlled to stop working; When judging the maximum temperature t of the battery cell in the current energy storage system max Satisfaction: t an-k ≤t max ≤t bn-k When the first liquid cooling unit is controlled to still operate at power M n-k run; Among them, satisfy: t bn >t an >t bn-k >t an-k , and M n >M n-k >M n-k-1 , n is a positive integer greater than 1, and k is a positive integer ≥ 1 and less than n.

[0014] In this solution, when k is equal to 1, it satisfies: 2℃<t an -t an-k <6℃, and / or, 2℃<t bn -t bn-k <6°C. In this solution, the control method of the thermal management system of the energy storage system further includes: When the maximum temperature of the battery cell in the current energy storage system is t max Not satisfied: 25℃<t max When the temperature is less than 37℃, continue to judge the maximum temperature of the battery cell in the energy storage system t max Is it satisfied: t max ≤25℃; When the maximum temperature of the battery cell in the current energy storage system is t max When the temperature is ≥25℃, continue to determine the maximum temperature difference t of the battery cells in the current energy storage system. dmax Is it satisfied: t dmax <5℃; When the maximum temperature difference of the battery cells in the current energy storage system is t dmax When the temperature is less than 5°C, the first valves and the second valves are all opened, and the water pumps and compressors of the first liquid cooling unit and the second liquid cooling unit are controlled to work, and the first liquid cooling unit and the second liquid cooling unit are both operated at rated power, so that the thermal management system is in a dual-machine full-power cooling mode.

[0015] In this solution, the control method of the thermal management system of the energy storage system further includes: When the maximum temperature of the battery cell in the current energy storage system is t max Not satisfied: 25℃<t max When the temperature is less than 37℃, continue to judge the maximum temperature of the battery cell in the energy storage system t max Is it satisfied: t max ≤25℃; When judging the maximum temperature t of the battery cell in the energy storage system max When the temperature is less than or equal to 25℃, the maximum temperature difference t of the battery cells in the current energy storage system will continue to be dmax Is it satisfied: t dmax <5℃; When the maximum temperature difference of the battery cells in the current energy storage system is t dmax When <5℃, continue to judge t dmax Is it satisfied: t dmax <2℃; When judging the maximum temperature difference t of the battery cells in the current energy storage system dmax When the temperature is ≥2°C, the first valves and the second valves are both opened, and the water pumps of the first liquid cooling unit and the second liquid cooling unit are controlled to operate, so that the thermal management system is in a self-circulation mode.

[0016] In this solution, the rated power of the first liquid cooling unit is greater than the rated power of the second liquid cooling unit.

[0017] A second aspect of the present application further provides an energy storage system, the energy storage system comprising the control method for the thermal management system of the energy storage system described above; The energy storage system includes a thermal management system and a battery device, wherein the battery device includes a plurality of battery clusters, and each battery cluster includes a plurality of battery cells; Each battery cluster includes a first water inlet, a second water inlet and a water outlet. The liquid cooling pipeline includes multiple first water inlet pipelines, multiple second water inlet pipelines and multiple water outlet pipelines. The first water inlet pipeline is used to connect the first water inlet with the first liquid cooling unit, the second water inlet pipeline is used to connect the second water inlet with the second liquid cooling unit, and the water outlet pipeline is used to connect the water outlet with the first liquid cooling unit and the second liquid cooling unit.

[0018] In this solution, the battery device further includes a control module and a monitoring module. The control module and the monitoring module are capable of exchanging information. The monitoring module includes a temperature sensor, and the monitoring module determines the current state of the thermal management system. The temperature sensor is used to detect the current temperature of each battery cell and exchange the temperature information of each battery cell with the control module to obtain the maximum temperature t of the battery cell in the current energy storage system. max ; The control module is used to determine the maximum temperature t of the battery cell in the current energy storage system. max The maximum temperature difference t of the battery cells in the energy storage system is calculated. dmax , to determine the maximum temperature difference t of the battery cells in the current energy storage system dmax The relationship between the size of the preset maximum temperature difference of the battery cells in the energy storage system is used to control the operating state of the first liquid cooling unit, the operating state of the second liquid cooling unit and the state of the second valve, so that the control module controls the thermal management system to switch to different modes.

[0019] In this solution, the control module can be based on the maximum temperature difference t of the battery cell in the current energy storage system. dmax , adjusting the operating power of the second liquid cooling unit; The control module can be configured to determine the maximum temperature t of the battery cell in the current energy storage system. max , adjust the operating power of the first liquid cooling unit.

[0020] It should be understood that the foregoing general description and the following detailed description are merely illustrative and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A flow chart of a control method for a thermal management system of an energy storage system provided in this application in a specific embodiment; Figure 2 A flow chart of a control method of the thermal management system of the energy storage system provided by this application when the thermal management system is in a stand-alone adaptive cooling mode in a specific embodiment; Figure 3A flow chart of a control method for the thermal management system of the energy storage system provided in this application when the thermal management system is in a dual-machine adaptive cooling mode in a specific embodiment; Figure 4 A flow chart of another specific embodiment of a control method for the thermal management system of the energy storage system provided by the present application when the thermal management system is in a stand-alone adaptive cooling mode; Figure 5 A flow chart of another specific embodiment of a method for controlling the thermal management system of the energy storage system provided by the present application when the thermal management system is in a dual-machine adaptive cooling mode; Figure 6 A flow chart of a control method for the thermal management system of the energy storage system provided in this application when the thermal management system is in a dual-machine adaptive cooling mode in a specific embodiment; Figure 7 This is a flow chart of a control method of the thermal management system of the energy storage system provided by this application when the thermal management system is in a single-unit cooling mode in a specific embodiment; Figure 8 This is a schematic structural diagram of the energy storage system provided in this application in a specific embodiment.

[0022] Description of reference numerals: 1-First liquid cooling unit; 2- Second liquid cooling unit; 3- Battery cluster; 4-first valve; 5- Second valve; 6-First water inlet pipeline; 7- Second water inlet pipe; 8-Water outlet pipe.

[0023] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0024] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0025] In a specific embodiment, the present application is further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0026] It should be clear that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0027] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "an", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0028] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0029] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described based on the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should be understood that when it is mentioned that an element is connected to another element "on" or "under", it can not only be directly connected to the other element "on" or "under", but also be indirectly connected to the other element "on" or "under" through an intermediate element.

[0030] Currently, the thermal management system of an energy storage system is equipped with a liquid cooling unit, which is connected to each battery cluster through various valves. When the temperature of a battery cluster in the energy storage system is too high, the opening of the valve corresponding to the cluster is increased, and the opening of the valves corresponding to other battery clusters except the cluster is reduced to increase the flow of coolant flowing to the cluster, thereby achieving rapid cooling of the cluster. However, since the total amount of coolant provided by the liquid cooling unit is often fixed, reducing the opening of the valves corresponding to other battery clusters except the cluster increases the resistance of the coolant flowing to the other battery clusters except the cluster, which in turn reduces the flow of coolant flowing to the other battery clusters except the cluster, resulting in a reduction in the overall cooling capacity of the energy storage system, which in turn easily leads to the risk of overheating of other battery clusters except the cluster, resulting in the problem of large temperature differences within the energy storage system.

[0031] To solve the above problems, the present application provides a control method for a thermal management system of an energy storage system, such as Figure 1 and Figure 8As shown, the thermal management system includes at least: a first liquid cooling unit 1, a second liquid cooling unit 2, multiple liquid cooling pipelines, and multiple first valves 4 and second valves 5. The first liquid cooling unit 1 and the second liquid cooling unit 2 are respectively connected in parallel with multiple battery clusters 3 of the energy storage system via multiple liquid cooling pipelines. The first valve 4 is connected between the first liquid cooling unit 1 and the water inlet of the multiple battery clusters 3 of the energy storage system, and the second valve 5 is connected between the second liquid cooling unit 2 and another water inlet of the multiple battery clusters 3 of the energy storage system. The first liquid cooling unit 1 and the second liquid cooling unit 2 are connected in parallel. The number of battery clusters 3 in the energy storage system can be X.

[0032] In addition, the energy storage system includes a thermal management system and a battery device. The battery device also includes multiple battery clusters 3, a control module and a monitoring module. The control module can control the thermal management system. The control module and the monitoring module can exchange information. The monitoring module includes a temperature sensor. The monitoring module determines the current state of the thermal management system. The temperature sensor is used to detect the current temperature of each battery cell and interacts with the control module to obtain the maximum temperature t of the battery cell in the current energy storage system. max .

[0033] The control module includes a battery management system (BMS), which is used to determine the maximum temperature of the battery cell in the current energy storage system. max The relationship between the preset maximum temperature range of the battery cell in the energy storage system and the maximum temperature difference t of the battery cell in the current energy storage system is calculated. dmax , to determine the maximum temperature difference t of the battery cells in the current energy storage system dmax The relationship between the size of the preset maximum temperature difference of the battery cells in the energy storage system enables the battery management system to control the operating state of the first liquid cooling unit 1 and the state of the first valve 4, the operating state of the second liquid cooling unit 2 and the state of the second valve 5, so that the battery management system of the control module controls the thermal management system to switch to different modes, thereby improving the feasibility and reliability of the thermal management system switching to different modes.

[0034] The control method of the thermal management system of the energy storage system includes at least the following steps: The monitoring module obtains the maximum temperature t of the battery cell in the current energy storage system max , the control module determines the current state of the thermal management system; The control module determines the maximum temperature t of the battery cell in the current energy storage system max Whether it meets: 25℃<t max <37℃; When the maximum temperature of the battery cell in the current energy storage system is t max Not satisfied: 25℃<t max When the temperature is less than 37℃, the control module continues to judge the maximum temperature of the battery cell in the energy storage system.max Is it satisfied: t max ≤25℃; When the maximum temperature of the battery cell in the current energy storage system is t max When the temperature is less than or equal to 25℃, the control module calculates the maximum temperature difference t of the battery cells in the current energy storage system. dmax , and determine the maximum temperature difference t of the battery cells in the current energy storage system dmax Is it satisfied: t dmax <5℃; When the maximum temperature difference of the battery cells in the current energy storage system is t dmax When the temperature is ≥5°C, the control module determines and locates the battery cluster 3 where the battery cell with the highest temperature is located in the energy storage system, and all first valves 4 are opened. The control module controls the water pump of the first liquid cooling unit 1 to operate, and the control module at least opens the second valve 5 corresponding to the battery cluster 3 where the battery cell with the highest temperature is located. The control module also controls the second liquid cooling unit 2 to operate at a power of W, so that the thermal management system is in a single-machine adaptive cooling mode.

[0035] Specifically, 25°C-37°C can be the preset maximum temperature range of the battery cells in the energy storage system, and 5°C can be the preset maximum temperature difference of the battery cells in the energy storage system. max The relationship between the temperature of the entire energy storage system and the preset maximum temperature range of the battery cell in the energy storage system is equivalent to determining the relationship between the temperature of the entire energy storage system and the preset maximum temperature range of the battery cell in the energy storage system. When determining the maximum temperature t max When the temperature is ≤25℃, it is determined that the overall temperature of the battery device in the current energy storage system is moderate, and the maximum temperature difference t of the battery cell in the current energy storage system is calculated at the same time. dmax , continue to determine the maximum temperature difference t of the battery cells in the current energy storage system dmax The relationship between the preset maximum temperature difference of the battery cell in the energy storage system and the maximum temperature difference of the battery cell in the current energy storage system is determined. dmax When the temperature is ≥5°C, it is determined that the temperature difference in the battery device in the current energy storage system is large, so that the thermal management system is in a single-machine adaptive cooling mode.

[0036] Therefore, the maximum temperature of the battery cell in the current energy storage system is t max ≤25℃, and the maximum temperature difference of the battery cells in the current energy storage system is t dmaxWhen the temperature is ≥5℃, the thermal management system is controlled to be in the stand-alone adaptive cooling mode. Since this mode opens the second valve 5 corresponding to the battery cluster 3 where the highest temperature battery cell is located, and the compressor of the water pump of the second liquid cooling unit 2 is all working, so that the second liquid cooling unit 2 can operate the cooling at power W, and then the second liquid cooling unit 2 can quickly cool the battery cluster 3 where the highest temperature battery cell is located, reduce the temperature difference between the battery cluster 3 where the highest temperature battery cell is located and the battery clusters 3 other than the battery cluster 3 where the highest temperature battery cell is located, and keep the energy storage system in the best operating state. At the same time, all the first valves 4 are Turn on the first liquid cooling unit 1 and start the water pump so that each battery cluster 3 in the energy storage system flows through the coolant provided by the first liquid cooling unit 1. That is, while ensuring the accelerated cooling of the battery cluster 3 where the battery cell with the highest temperature is located, the other battery clusters 3 except the battery cluster 3 where the battery cell with the highest temperature is located all flow through the coolant provided by the first liquid cooling unit 1, thereby preventing the fluctuation of the other battery clusters 3 except the battery cluster 3 where the battery cell with the highest temperature is located from being too large, reducing the risk of overheating of the other battery clusters 3 except the battery cluster 3 where the battery cell with the highest temperature is located, and realizing rapid temperature equalization of the energy storage system.

[0037] In summary, the thermal management system is in a single-machine adaptive cooling mode, which is mainly used to reduce the temperature difference of the battery cluster 3 in the energy storage system. The thermal management system is provided with a first liquid cooling unit 1 and a second liquid cooling unit 2 in parallel. The second cooling unit can independently and quickly cool the battery cluster 3 where the highest temperature battery cell is located. At the same time, the first liquid cooling unit 1 is used to provide coolant for all battery clusters 3 in the energy storage system, and can relatively balance the flow rate flowing through the battery cluster 3 where the highest temperature battery cell is located and the battery clusters 3 other than the battery cluster 3 where the highest temperature battery cell is located. That is, after opening the corresponding second valve 5, it will not affect the flow rate of coolant flowing through the battery cluster 3 other than the battery cluster 3 where the highest temperature battery cell is located, so that the temperature fluctuations of the battery clusters 3 other than the battery cluster 3 where the highest temperature battery cell is located will not be too large, so that the battery device of the energy storage system can quickly and accurately equalize the temperature.

[0038] At the same time, compared to the traditional energy storage system that reduces the opening of some valves to achieve the cooling of the battery cluster 3 that needs to be cooled quickly, in this application, the thermal management system is in a single-machine adaptive cooling mode, and all the first valves 4 are open and fully open, that is, the valve opening is 100%, which can reduce the risk of increased resistance along the entire liquid cooling pipeline, that is, the pressure loss caused by the friction between the fluid and the pipe wall during the flow of the coolant increases, thereby reducing the risk of reduced overall flow of the energy storage system, which is conducive to further achieving rapid cooling and temperature equalization of the battery device. In addition, since when judging the maximum temperature t of the battery cell in the current energy storage system maxWhen the temperature is ≤25°C, that is, when it is determined that the overall temperature in the current energy storage system is moderate, the water pump of the first liquid cooling unit 1 is in operation, and the compressor of the first liquid cooling unit 1 is inoperative. That is, the first liquid cooling unit 1 is used to reduce the risk of temperature fluctuations of the battery cells in the battery cluster 3 except for the battery cells with the highest temperature, so as to keep the overall temperature of the battery devices in the energy storage system moderate, thereby reducing the internal resistance of the battery devices, and helping to reduce the energy consumption of the energy storage system and reduce costs.

[0039] In addition, the control module determines the maximum temperature t of the battery cell in the current energy storage system. max The relationship between the preset maximum temperature range of the battery cell in the energy storage system and the maximum temperature difference t of the battery cell in the current energy storage system is determined. dmax The relationship between the size of the preset maximum temperature difference of the battery cells in the energy storage system is such that the thermal management system can switch to different required modes in a timely manner, effectively balancing the maximum temperature difference of the battery cells and the overall temperature of the battery cells, which is beneficial to improving the accuracy and speed of the thermal management system for cooling and / or reducing the temperature difference, and is beneficial to achieving rapid and accurate temperature equalization of each battery cluster 3 in the energy storage system, and enabling each battery cluster 3 to be cooled to the optimal operating temperature, which is beneficial to improving the performance of the operation of the energy storage system. At the same time, it enables the thermal management system to switch to different required modes in a timely manner, reducing the energy consumption of the thermal management system, and thereby reducing the energy consumption of the energy storage system.

[0040] In one possible implementation, Figure 1 As shown, the control method of the thermal management system of the energy storage system also includes: When the control module determines the maximum temperature t of the battery cell in the current energy storage system max Satisfaction: 25℃<t max When the temperature is less than 37℃, the control module continues to judge the maximum temperature difference t of the battery cells in the current energy storage system. dmax Is it satisfied: t dmax <5℃; When the maximum temperature difference of the battery cells in the current energy storage system is t dmax When the temperature is ≥5°C, the control module determines and locates the battery cluster 3 where the battery cell with the highest temperature is located, and all first valves 4 are opened. The control module controls the water pumps and compressors of the first liquid cooling unit 1 and the second liquid cooling unit 2 to operate. The control module at least opens the second valve 5 corresponding to the battery cluster 3 where the battery cell with the highest temperature is located, and the control module controls the first liquid cooling unit 1 to operate at power M and the second liquid cooling unit 2 to operate at power W, so that the thermal management system is in dual-machine adaptive cooling mode.

[0041] In this embodiment, the maximum temperature of the battery cell in the current energy storage system is 25℃<t max <37℃, that is, when the overall temperature of the battery device in the current energy storage system is judged to be slightly higher, and the maximum temperature difference t dmaxWhen the temperature is ≥5℃, that is, when it is determined that the temperature difference of the battery device in the current energy storage system is large, the thermal management system is controlled to be in dual-machine adaptive cooling mode.

[0042] Therefore, the dual-machine adaptive cooling mode is mainly used to reduce the temperature of the battery cluster 3 in the energy storage system and to reduce the temperature difference between the battery clusters 3 in the energy storage system. All first valves 4 are opened, and at least the second valve 5 corresponding to the battery cluster 3 where the battery cell with the highest temperature is located is opened. The first liquid cooling unit 1 operates at power M, and the second liquid cooling unit 2 operates at power W. Thus, the first liquid cooling unit 1 can quickly cool down all battery clusters 3, thereby achieving rapid cooling of the battery device in the energy storage system as a whole. At the same time, the second liquid cooling unit 2 can quickly cool down the battery cluster 3 where the battery cell with the current highest temperature is located, which is beneficial to reducing the temperature difference between the battery cluster 3 where the battery cell with the current highest temperature is located and other battery clusters 3 except the battery cluster 3 where the battery cell with the highest temperature is located, thereby reducing the risk of capacity decay of the battery device in the energy storage system and improving the life of the battery device in the energy storage system.

[0043] In addition, the thermal management system is in a stand-alone adaptive cooling mode, and all first valves 4 are open and fully open, that is, the valve opening is 100%, which can reduce the risk of increased resistance along the entire liquid cooling pipeline, and achieve rapid cooling and temperature equalization of the battery device. At the same time, since the first liquid cooling unit 1 and the second liquid cooling unit 2 are relatively independent, the first liquid cooling unit 1 is used to cool all battery clusters 3 in the energy storage system, and can relatively balance the flow through the battery cluster 3 where the highest temperature battery cell is located and the other battery clusters 3 except the battery cluster 3 where the highest temperature battery cell is located, that is, after opening the corresponding second valve 5, it will not affect the flow of coolant flowing through the other battery clusters 3 except the battery cluster 3 where the highest temperature battery cell is located, so that the temperature of the other battery clusters 3 except the battery cluster 3 where the highest temperature battery cell is located can be steadily reduced, so that the battery device of the energy storage system can quickly and accurately equalize the temperature. In one possible embodiment, such as Figure 1 As shown, the control method of the thermal management system of the energy storage system also includes: When the control module determines the maximum temperature t of the battery cell in the current energy storage system max Not satisfied: 25℃<t max When the temperature is less than 37℃, the control module continues to judge the maximum temperature of the battery cell in the energy storage system. max Is it satisfied: t max ≤25℃; When the control module determines the maximum temperature t of the battery cell in the current energy storage system max When the temperature is ≥25℃, the control module continues to determine the maximum temperature difference t of the battery cells in the current energy storage system. dmax Is it satisfied: t dmax <5℃; When the maximum temperature difference of the battery cells in the current energy storage system is t dmaxWhen the temperature is ≥5°C, the control module determines and locates the battery cluster 3 where the battery cell with the highest temperature is located, and all first valves 4 are opened. The control module controls the water pumps and compressors of the first liquid cooling unit 1 and the second liquid cooling unit 2 to operate. The control module at least opens the second valve 5 corresponding to the battery cluster 3 where the battery cell with the highest temperature is located, and the control module controls the first liquid cooling unit 1 to operate at power M, and the control module controls the second liquid cooling unit 2 to operate at power W, so that the thermal management system is in dual-machine adaptive cooling mode.

[0044] In this embodiment, when the maximum temperature t of the battery cell in the current energy storage system is determined max ≥25℃, that is, the maximum temperature of the battery cell in the current energy storage system t max ≥37℃, that is, when it is judged that the overall temperature of the battery device in the current energy storage system is high, and the maximum temperature difference t dmax When the temperature is ≥5℃, that is, when it is determined that the temperature difference of the battery device in the current energy storage system is large, the thermal management system is controlled to be in dual-machine adaptive cooling mode.

[0045] In summary, when the maximum temperature of the battery cell in the current energy storage system meets the following conditions: 25℃<t max <37℃, or the maximum temperature of the battery cell in the current energy storage system t max ≥37℃, and the maximum temperature difference of the battery cells in the current energy storage system is t dmax When the temperature is ≥5°C, the first liquid cooling unit 1 can quickly cool down each battery cluster 3, thereby quickly cooling down the entire battery device in the energy storage system. At the same time, the second liquid cooling unit 2 can quickly cool down the battery cluster 3 where the current highest temperature battery cell is located, which is beneficial to reducing the temperature difference between the battery cluster 3 where the current highest temperature battery cell is located and other battery clusters 3 except the battery cluster 3 where the highest temperature battery cell is located, thereby improving the life of the battery device in the energy storage system.

[0046] In one possible implementation, Figure 1 As shown, the control method of the thermal management system of the energy storage system further includes: the control module calculates the average temperature t of all the battery cells in the current energy storage system mean , and according to the formula: The control module calculates the maximum temperature difference t of the battery cells in the current energy storage system dmax .

[0047] According to the formula: , calculate the maximum temperature difference t of the battery cells in the current energy storage system dmax, and then control the opening or closing state of the second valve 5, so that the second liquid cooling unit 2 can accurately control the opening or closing state of the second valve 5 according to the difference between the battery cluster 3 where the highest temperature battery cell is located and the average temperature of all battery cells in the energy storage system, thereby improving the feasibility and reliability of the second liquid cooling unit 2 in performing targeted cooling. At the same time, the second liquid cooling unit 2 can be adjusted according to t dmax The operating power W is adjusted in real time to prevent the second liquid cooling unit 2 from having too high or too low a cooling effect on the battery cluster 3 where the battery cell with the highest temperature is located, thereby reducing the risk of excessive or insufficient cooling of the battery cluster 3 where the battery cell with the highest temperature is located, thereby achieving precise control of the temperature balance between the battery cluster 3 where the battery cell with the highest temperature is located and other battery clusters 3 except the battery cluster 3 where the battery cell with the highest temperature is located.

[0048] In one possible implementation, Figure 1 As shown, when the thermal management system is in dual-machine adaptive cooling mode or single-machine adaptive cooling mode, at time K2 t rmax Not equal to t max When , the control method of the thermal management system of the energy storage system further includes: according to the formula: , calculate the maximum temperature difference t of the battery cells in the energy storage system dmax1 ; Among them, t mean is the average temperature of all cells in the current energy storage system, t rmax The current maximum temperature of the battery cell in the battery cluster where the battery cell with the highest temperature in the energy storage system is located at time K1, that is, the current maximum temperature of the battery cell in the battery cluster 3 where the second valve 5 opened at time K1 is connected, and at time K1 t rmax Equal to t max .

[0049] When the thermal management system is in the dual-machine adaptive cooling mode or the single-machine adaptive cooling mode, the K1 moment can be before the K2 moment, and the second liquid cooling unit 2 can cool the battery cluster 3 where the battery cell with the current highest temperature is located at the K1 moment. For example, when the battery cluster 3 where the battery cell with the current highest temperature is located at the K1 moment is the first battery cluster, the highest temperature of the battery cells in the first battery cluster is t rmax As the second liquid cooling unit 2 rapidly cools the first battery cluster, the temperature of the cells in the first battery cluster decreases in real time. At time K2, there is a t rmax Not equal to t max In the case that the maximum temperature of the battery cells in the first battery cluster at time K2 is not equal to the maximum temperature of the battery cells in the current energy storage system, that is, when a battery cell in a battery cluster 3 other than the first battery cluster is the battery cell with the current highest temperature at this moment, according to the formula: , calculate the maximum temperature difference t of the battery cell in the energy storage system at the last moment dmax1, that is, calculating the difference between the maximum temperature of the battery cells in the first battery cluster and the average temperature of all battery cells in the current energy storage system, thereby improving the reliability and feasibility of the second liquid cooling unit 2 being able to continue to cool the battery cluster 3 where the battery cell with the highest temperature at the previous moment is located to the target temperature, that is, improving the reliability and feasibility of the second liquid cooling unit 2 being able to continue to cool the first battery cluster to the target temperature, thereby achieving precise temperature equalization of the battery devices in the energy storage system, improving the operating performance of the battery devices, and at the same time preventing the second liquid cooling unit 2 from having an excessively high or low cooling effect on the first battery cluster, further enabling precise control of the temperature balance between the first battery cluster and other battery clusters 3 except the first battery cluster, that is, achieving precise control of the temperature balance between the battery cluster 3 where the battery cell with the highest temperature at the previous moment is located and other current battery clusters 3.

[0050] It should be noted that, except when the thermal management system is in the dual-machine adaptive cooling mode or the single-machine adaptive cooling mode, the formula is as follows: , calculate the maximum temperature difference t of the battery cells in the current energy storage system dmax , such as when the thermal management system is initially started.

[0051] In one possible implementation, Figure 2 and Figure 3 As shown, when it is determined that the thermal management system needs to be in the single-machine adaptive cooling mode or the dual-machine adaptive cooling mode, the control method of the thermal management system of the energy storage system further includes: The control module can determine and execute the following steps: When judging the maximum temperature difference t of the battery cells in the current energy storage system dmax Satisfaction: t sn ≤t dmax ≤t fn When the second liquid cooling unit 2 is powered by W n Run and continue to determine the maximum temperature difference t of the battery cells in the current energy storage system dmax Is it satisfied: t dmax <t sn ; When the maximum temperature difference of the battery cells in the current energy storage system is t dmax <t sn When the second liquid cooling unit 2 is controlled to have a power of W n-k Run and continue to determine the maximum temperature difference t of the battery cells in the current energy storage system dmax Is it satisfied: t dmax <t sn-k ; or, when the maximum temperature difference of the battery cells in the current energy storage system is t dmax Still satisfied: t sn ≤t dmax ≤t fn When the second liquid cooling unit 2 is controlled to still use power W nContinue running; When judging the maximum temperature difference t of the battery cells in the current energy storage system dmax <t sn-k , and satisfy t dmax When the minimum preset temperature difference is not reached, the second liquid cooling unit 2 is controlled to operate at a power of W n-k-1 run; When judging the maximum temperature difference t of the battery cells in the current energy storage system dmax <t sn-k , and satisfy t dmax When the minimum preset temperature difference is reached, the second liquid cooling unit 2 is controlled to stop working; When judging t fn-k ≥t dmax ≥t sn-k When the second liquid cooling unit 2 is controlled to still use power W n-k run; Among them, satisfy: t fn >t sn >t fn-k >t sn-k , and W n >W n-k >W n-k-1 , n is a positive integer greater than 1, and k is a positive integer ≥ 1 and less than n.

[0052] It should be noted that W includes the above-mentioned W1, W2, ... W n-k-1 、W n-k 、……W n The battery management system (BMS) of the control module can be based on the maximum temperature difference t of the battery cell in the current energy storage system. dmax , adjust the operating power W of the second liquid cooling unit 2, and improve the reliability and feasibility of adjusting the operating power of the second liquid cooling unit 2.

[0053] In addition, if Figure 4 and Figure 5 As shown, t rmax Not equal to t max When it is determined that the thermal management system needs to be in the single-machine adaptive cooling mode or the dual-machine adaptive cooling mode, the control method of the thermal management system of the energy storage system further includes: When judging the maximum temperature difference t of the battery cells in the energy storage system dmax1 Satisfaction: t sn ≤t dmax1 ≤t fn When the second liquid cooling unit 2 is powered by W n Run and continue to determine the maximum temperature difference t of the battery cells in the current energy storage system dmax1 Is it satisfied: t dmax1 <t sn ; When the maximum temperature difference of the battery cells in the current energy storage system is t dmax1 <t sn When the second liquid cooling unit 2 is controlled to have a power of W n-k Run and continue to determine the maximum temperature difference t of the battery cells in the current energy storage system dmax1 Is it satisfied: t dmax1 <t sn-k ; or, when the maximum temperature difference of the battery cells in the current energy storage system is t dmax1 Still satisfied: t sn ≤t dmax1 ≤t fn When the second liquid cooling unit 2 is controlled to still use power W n Continue running; When judging the maximum temperature difference t of the battery cells in the current energy storage system dmax1 <t sn-k , and satisfy t dmax1 When the minimum preset temperature difference is not reached, the second liquid cooling unit 2 is controlled to operate at a power of W n-k-1 run; When judging the maximum temperature difference t of the battery cells in the current energy storage system dmax1 <t sn-k , and when tdmax1 reaches the minimum preset temperature difference, the second liquid cooling unit 2 is controlled to stop working; When judging t fn-k ≥t dmax1 ≥t sn-k When the second liquid cooling unit 2 is controlled to still use power W n-k run; Specifically, for example, when n is equal to 3 and K is equal to 1, t sn , t sn-k , t sn-k-1 t s3 , t s2 , t s1 , and t s3 >t s2 >t s1 , t fn , t fn-k , t fn-k-1 t f3 , t f2 , t f1 , and t f3 >t f2 >t f1 , W n 、W n-k 、W n-k-1 The order is W3, W2, and W1, and W3>W2>W1. When the current thermal management system needs to be in single-machine adaptive cooling mode or dual-machine adaptive cooling mode, first determine the current t dmax or t dmax1Whether the first preset temperature difference range is met: t s1 ≤t dmax or t dmax1 ≤t f1 , judge the current t dmax or t dmax1 If the first preset temperature difference range is not met, the current t dmax or t dmax1 Whether the second preset temperature difference range is met: t s2 ≤t dmax or t dmax1 ≤t f2 , judge the current t dmax or t dmax1 If the second preset temperature difference range is not met, the current t dmax or t dmax1 Whether the third preset temperature difference range is met: t s3 ≤t dmax or t dmax1 ≤t f3 , judge the current t dmax or t dmax1 When the third preset temperature difference range is met, the second liquid cooling unit 2 is controlled to set the target temperature at t dmax or t dmax1 <t s3 The corresponding operating power W3 runs, and then continues to judge the current t dmax or t dmax1 Is it satisfied: t dmax or t dmax1 <t s3 , when judging the current t dmax or t dmax1 Satisfaction: t dmax or t dmax1 <t s3 When the second liquid cooling unit 2 is controlled to dmax or t dmax1 <t s2 The corresponding operating power W2 is running, then continue to judge the current t dmax or t dmax1 Is it satisfied: t dmax or t dmax1 <t s2 , when judging the current t dmax or t dmax1 Satisfaction: t dmax or t dmax1 <t s2 When the second liquid cooling unit 2 is controlled to dmax or t dmax1 <t s1 The corresponding operating power W1 is running, then continue to judge the current t dmax or tdmax1 Is it satisfied: t dmax or t dmax1 <t s1 , when judging the current t dmax or t dmax1 Satisfaction: t dmax or t dmax1 <t s1 At this time, t dmax or t dmax1 Less than the minimum preset temperature difference t s1 When the second liquid cooling unit 2 is controlled to stop working.

[0054] Or, when judging the current t dmax or t dmax1 Not satisfied: t dmax or t dmax1 <t s3 When, that is, the current t dmax or t dmax1 The value of t is still large, and the second liquid cooling unit 2 is controlled to still operate at power W3; or, when it is determined that the current t dmax or t dmax1 Not satisfied: t dmax or t dmax1 <t s2 When, that is, the current t dmax or t dmax1 The value of t is still large, and the second liquid cooling unit 2 is controlled to still operate at power W2; or, when it is determined that the current t dmax or t dmax1 Not satisfied: t dmax or t dmax1 <t s1 When, that is, the current t dmax or t dmax1 The value of is still large, and the second liquid cooling unit 2 is controlled to still operate at power W1, so that the battery cells in the energy storage system can be exhausted quickly and cooled to the target temperature, thereby improving the cooling efficiency.

[0055] Therefore, the control module determines the current t dmax or t dmax1 Whether the temperature difference range is gradually reduced, and then the operating power W of the second liquid cooling unit 2 is controlled according to the corresponding temperature difference range, so that the second liquid cooling unit 2 can achieve multi-level power regulation, which is beneficial to reducing the energy consumption of the thermal management system and is also beneficial to accurately control the current t dmax or t dmax1 Lower the target temperature value, thereby improving the reliability and stability of the thermal management system's ability to accurately average temperatures.

[0056] In one possible implementation, Figure 2 and Figure 3 As shown, when k is equal to 1, it satisfies: 1℃<tsn -t sn-k <2.5℃, and / or, 1℃<t fn -t fn-k <2.5℃.

[0057] Optionally, when k is equal to 1, 1°C < t sn -t sn-k <2.5℃,t sn -t sn-k The value can be 1℃, 1.1℃, 1.2℃, 1.3℃, 1.4℃, 1.5℃, 1.6℃, 1.7℃, 1.8℃, 1.9℃, 2.0℃, 2.1℃, 2.2℃, 2.3℃, 2.4℃, 2.5℃, etc., or other values within the above range, which is not limited in this embodiment.

[0058] In this embodiment, when k is equal to 1, the following conditions are satisfied: 1°C < t sn -t sn-k <2.5℃, so that the difference between the lower limit values of the closest preset temperature difference range is moderate, reducing the risk of overcooling after the second liquid cooling unit 2 switches to different operating powers, so that the temperature of the battery device is moderately lowered, and the internal temperature of the battery device is balanced, thereby improving the discharge performance and charging efficiency of the battery device and improving the safety of the energy storage system.

[0059] Optionally, when k is equal to 1, 1°C < t fn -t fn-k <2.5℃,t fn -t fn-k The value can be 1℃, 1.1℃, 1.2℃, 1.3℃, 1.4℃, 1.5℃, 1.6℃, 1.7℃, 1.8℃, 1.9℃, 2.0℃, 2.1℃, 2.2℃, 2.3℃, 2.4℃, 2.5℃, etc., or other values within the above range, which is not limited in this embodiment.

[0060] In this embodiment, when k is equal to 1, the following conditions are satisfied: 1°C < t fn -t fn-k <2.5℃, so that the difference between the upper limits of the closest preset temperature difference range is moderate, reducing the risk of insufficient cooling after the second liquid cooling unit 2 switches to different operating powers, so that the temperature of the battery device is moderately lowered, and the internal temperature of the battery device is balanced, thereby improving the discharge performance and charging efficiency of the battery device and improving the safety of the energy storage system.

[0061] In summary, when k is equal to 1, 1℃<t sn -t sn-k <2.5℃, and 1℃<t fn -t fn-k<2.5℃, that is, the difference between the closest temperature ranges meets the range of 1℃-2.5℃, so that the difference between the closest temperature ranges is moderate, for example, meeting: 1℃ <t s2 -t s1 <2.5℃, and / or, 1℃<t f2 -t f1 <2.5°C helps improve the robustness of the thermal management system. Specifically, the thermal management system can automatically adjust the cooling efficiency of the second liquid cooling unit 2 as the temperature of the battery device in the current energy storage system changes, achieving multi-level power regulation of the second liquid cooling unit 2. This improves the adaptability of the thermal management system, maintaining optimal performance, and reducing the energy consumption of the thermal management system. This improves the stability of the thermal management system's operation, thereby reducing the energy consumption of the energy storage system. At the same time, it can precisely control the amount of cooling applied to the battery device, ensuring optimal performance.

[0062] It should be noted that t sn , t sn-k , t sn-k-1 , t fn , t fn-k , t fn-k-1 、W n 、W n-k 、W n-k-1 All are set values. sn , t sn-k , t sn-k-1 , t fn , t fn-k , t fn-k-1 The value of can be set according to the specific model and specifications of the battery device in the energy storage system. n 、W n-k 、W n-k-1 The specific value can be set according to the operating power of the thermal management system in the energy storage system.

[0063] In one possible implementation, Figure 6 As shown, when it is determined that the thermal management system needs to be in the dual-machine adaptive cooling mode, the control method of the thermal management system of the energy storage system further includes: The control module can determine and execute the following steps: Determine the maximum temperature t of the battery cell in the current energy storage system max Satisfaction: t an ≤t max ≤t bn When the first liquid cooling unit 1 is powered by M n Run and continue to judge the maximum temperature t of the battery cell in the current energy storage system max Is it satisfied: t max <t an ; When judging the maximum temperature t of the battery cell in the current energy storage system max <t an When the first liquid cooling unit 1 is controlled to operate at power M n-k Run, continue to judge t max Is it satisfied: t max <t an-k ;or, When judging the maximum temperature t of the battery cell in the current energy storage system max Satisfaction: t an ≤t max ≤t bn When the first liquid cooling unit 1 is controlled to still operate at power M n run; When judging the maximum temperature t of the battery cell in the current energy storage system max <t an-k , and satisfy t max When the minimum set temperature is not reached, the first liquid cooling unit 1 is controlled to operate at power M n-k-1 run; When judging the maximum temperature t of the battery cell in the current energy storage system max <t an-k , and satisfy t max When the minimum set temperature is reached, the first liquid cooling unit 1 is controlled to stop working; When judging the maximum temperature t of the battery cell in the current energy storage system max Satisfaction: t an-k ≤t max ≤t bn-k When the first liquid cooling unit 1 is controlled to still operate at power M n-k run; Among them, satisfy: t bn >t an >t bn-k >t an-k , and M n >M n-k >M n-k-1 , n is a positive integer greater than 1, and k is a positive integer ≥ 1 and less than n.

[0064] It should be noted that M includes the above-mentioned M1, M2, ...M n-k-1 、M n-k 、……M n The battery management system of the control module can be based on the maximum temperature t of the battery cell in the current energy storage system. max , adjust the operating power of the first liquid cooling unit 1, and improve the reliability and feasibility of adjusting the operating power M of the first liquid cooling unit 1.

[0065] Specifically, for example, when n is equal to 3 and K is equal to 1, t an , t an-k , tan-k-1 t a3 , t a2 , t a1 , and t a3 >t a2 >t a1 , t bn , t bn-k , t bn-k-1 t b3 , t b2 , t b1 , and t b3 >t b2 >t b1 , M n 、M n-k 、M n-k-1 The order is M3, M2, M1, and M3>M2>M1. When the current thermal management system needs to be in dual-machine adaptive cooling mode, first determine the current t max Whether the first preset maximum temperature range is met: t a1 ≤t max ≤t b1 , judge the current t max If the first preset maximum temperature range is not met, continue to judge the current t max Whether the second preset maximum temperature range is met: t a2 ≤t max ≤t b2 , judge the current t max If the second preset maximum temperature range is not met, the current t max Whether the third preset maximum temperature range is met: t a3 ≤t max ≤t b3 , judge the current t max When the third preset maximum temperature range is met, the first liquid cooling unit 1 is controlled to set the target temperature to t max <t a3 The corresponding operating power M3 runs, and then continues to judge the current t max Is it satisfied: t max <t a3 , when judging the current t max Satisfaction: t max <t a3 When the first liquid cooling unit 1 is controlled to max <t a2 The corresponding operating power M2 is running, then continue to judge the current t max Is it satisfied: t max <t a2 , when judging the current t max Satisfaction: t max <t a2When the first liquid cooling unit 1 is controlled to max <t a1 The corresponding operating power M1 is running, then continue to judge the current t max Is it satisfied: t max <t a1 , when judging the current t max Satisfaction: t max <t a1 At this time, t max Less than the minimum preset temperature difference t a1 When the first liquid cooling unit 1 is controlled to stop working.

[0066] Or, when judging the current t max Not satisfied: t max <t a3 When, that is, the current t max The value of t is still large, the first liquid cooling unit 1 is controlled to still operate at power M3, or, when it is determined that the current t max Not satisfied: t max <t a2 When, that is, the current t max The value of t is still large, the first liquid cooling unit 1 is controlled to still operate at power M2, or, when it is determined that the current t max Not satisfied: t max <t a1 When, that is, the current t max The value of is still large, and the first liquid cooling unit 1 is controlled to still operate at power M1, so that the battery cells in the energy storage system can be exhausted quickly and cooled to the target temperature, thereby improving the cooling efficiency.

[0067] Therefore, the control module determines the current t max Whether the preset maximum temperature range is met in descending order, and then the operating power M of the first liquid cooling unit 1 is controlled according to the corresponding preset maximum temperature range, so that the first liquid cooling unit 1 can achieve multi-level power adjustment in the dual-machine adaptive cooling mode, which is beneficial to reducing the energy consumption of the thermal management system and is also beneficial to accurately control the current t max Lowering the target temperature value improves the accuracy and stability of the thermal management system used to regulate the battery devices of the energy storage system to maintain the optimal operating temperature.

[0068] In one possible implementation, Figure 6 As shown, when k is equal to 1, it satisfies: 2℃<t an -t an-k <6℃, and / or, 2℃<t bn -t bn-k <6℃.

[0069] Optionally, when k is equal to 1, the following conditions are satisfied: 2°C < t an -tan-k <6℃, t an -t an-k The value can be 2℃, 2.2℃, 2.4℃, 2.5℃, 2.6℃, 2.8℃, 3.0℃, 3.2℃, 3.4℃, 3.5℃, 3.6℃, 3.8℃, 4.0℃, 4.2℃, 4.4℃, 4.5℃, 4.6℃, 4.8℃, 5.0℃, 5.2℃, 5.4℃, 5.5℃, 5.6℃, 5.8℃, 6.0℃, etc., or other values within the above range, which is not limited in this embodiment.

[0070] In this embodiment, when k is equal to 1, the following conditions are satisfied: 2°C < t an -t an-k <6°C, so that the difference between the lower limit values of the closest preset maximum temperature range is moderate, reducing the risk of overcooling after the first liquid cooling unit 1 switches to different operating powers, so that the overall temperature of the battery device is moderate, improving the discharge performance and charging efficiency of the battery device, and at the same time improving the safety of the energy storage system.

[0071] Optionally, when k is equal to 1, the following conditions are satisfied: 2°C < t bn -t bn-k <6℃, t bn -t bn-k The value can be 2℃, 2.2℃, 2.4℃, 2.5℃, 2.6℃, 2.8℃, 3.0℃, 3.2℃, 3.4℃, 3.5℃, 3.6℃, 3.8℃, 4.0℃, 4.2℃, 4.4℃, 4.5℃, 4.6℃, 4.8℃, 5.0℃, 5.2℃, 5.4℃, 5.5℃, 5.6℃, 5.8℃, 6.0℃, etc., or other values within the above range, which is not limited in this embodiment.

[0072] In this embodiment, when k is equal to 1, the following conditions are satisfied: 2°C < t bn -t bn-k <6°C, so that the difference between the upper limits of the closest preset temperature difference range is moderate, reducing the risk of insufficient cooling after the first liquid cooling unit 1 switches to different operating powers, so that the temperature of the battery device is moderately lowered, and the internal temperature of the battery device is balanced, thereby improving the discharge performance and charging efficiency of the battery device and improving the safety of the energy storage system.

[0073] In summary, when k is equal to 1, 2℃<t an -t an-k <6℃, and 2℃<t bn -t bn-k <6℃, that is, the difference between the closest preset maximum temperatures meets the range of 2℃-6℃, so that the difference between the closest preset maximum temperatures is moderate, for example, meeting: 2℃ <ta2 -t a1 <6℃, and / or, 2℃<t b2 -t b1 <6°C helps improve the robustness of the thermal management system. Specifically, the thermal management system can automatically adjust the cooling efficiency of the first liquid cooling unit 1 as the temperature of the battery device in the current energy storage system changes, achieving multi-level power regulation of the first liquid cooling unit 1. This improves the adaptability of the thermal management system, maintains optimal performance, reduces energy consumption, and improves the stability of the thermal management system's operation, thereby reducing the energy consumption of the energy storage system. At the same time, it can precisely control the amount of cooling applied to the battery device, ensuring optimal performance.

[0074] It should be noted that t an , t an-k , t an-k-1 , t bn , t bn-k , t bn-k-1 、M n 、M n-k 、M n-k-1 All are set values. Among them, t an , t an-k , t an-k-1 , t bn , t bn-k , t bn-k-1 The value of can be set according to the specific model and specifications of the battery equipment in the energy storage system. The value of M can be set according to the operating power of the thermal management system in the energy storage system.

[0075] In addition, when the thermal management system is in the dual-machine adaptive cooling mode, the first liquid cooling unit 1 and the second liquid cooling unit 2 can both adaptively adjust the operating power. The operating power W of the second liquid cooling unit 2 depends on the current t dmax or t dmax1 The value of t is used to quickly cool down the battery cluster 3 where the battery cell with the highest temperature is located and to adaptively adjust the cooling rate of the battery cluster 3. At the same time, the operating power M of the first liquid cooling unit 1 depends on the current t maxThe value of is set so that each battery cluster 3 can be cooled quickly, and the cooling rate of each battery cluster 3 can be adaptively adjusted, thereby effectively balancing the temperature of the overall battery device of the energy storage system and the temperature of the battery cluster 3 where the battery cell with the current highest temperature is located, so as to achieve accurate real-time temperature uniformity. Moreover, since the operating power W of the second liquid cooling unit 2 and the operating power M of the first liquid cooling unit 1 both change in real time, it is also beneficial to reduce the risk of too little coolant flowing through the battery cluster 3 other than the battery cluster 3 where the battery cell with the highest temperature is located, or reduce the risk of too much coolant flowing through the battery cluster 3 where the battery cell with the highest temperature is located, and then implement precise control to make the temperature of the battery clusters 3 other than the battery cluster 3 where the battery cell with the highest temperature is located, so that the temperature fluctuation of the battery clusters 3 other than the battery cluster 3 where the battery cell with the highest temperature is not too large, thereby reducing the risk of overheating of a battery cluster 3 in the battery device, and also reducing the risk of too fast cooling rate of the battery cluster 3 where the battery cell with the highest temperature is located, further achieving rapid and accurate temperature uniformity of the energy storage system.

[0076] In one possible implementation, Figure 1 As shown, the control method of the thermal management system of the energy storage system also includes: When the maximum temperature of the battery cell in the current energy storage system is t max Not satisfied: 25℃<t max When the temperature is less than 37℃, the control module continues to judge the maximum temperature of the battery cell in the energy storage system. max Is it satisfied: t max ≤25℃; When the maximum temperature of the battery cell in the current energy storage system is t max When the temperature is ≥25℃, the control module continues to determine the maximum temperature difference t of the battery cells in the current energy storage system. dmax Is it satisfied: t dmax <5℃; When the maximum temperature difference of the battery cells in the current energy storage system is t dmax When the temperature is less than 5°C, the control module controls all first valves 4 and all second valves 5 to be open, controls the water pumps and compressors of the first liquid cooling unit 1 and the second liquid cooling unit 2 to work, and both the first liquid cooling unit 1 and the second liquid cooling unit 2 operate at rated power to put the thermal management system in dual-machine full-power cooling mode.

[0077] In this embodiment, when the control module determines the maximum temperature t of the battery cell in the current energy storage system max ≥25℃, that is, the maximum temperature of the battery cell in the current energy storage system t max ≥37℃, that is, when the overall temperature of the battery device in the current energy storage system is judged to be too high, and the maximum temperature difference t dmax When the temperature is less than 5°C, that is, when it is determined that the temperature difference in the battery device in the current energy storage system is small, the thermal management system is controlled to be in the dual-machine full-power cooling mode.

[0078] Therefore, the dual-machine full-power cooling mode is mainly used to reduce the temperature of each battery cluster 3. By simultaneously operating the first liquid cooling unit 1 and the second liquid cooling unit 2 at rated power, the thermal management system can perform cooling at maximum power, thereby quickly reducing the overall temperature of the battery device in the energy storage system, improving the cycle life of the battery device in the energy storage system, and improving the safety of the energy storage system.

[0079] In one possible implementation, Figure 1 As shown, the control method of the thermal management system of the energy storage system also includes: When the maximum temperature of the battery cell in the current energy storage system is t max Not satisfied: 25℃<t max When the temperature is less than 37℃, the control module continues to judge the maximum temperature of the battery cell in the energy storage system. max Is it satisfied: t max ≤25℃; When the control module determines the maximum temperature t of the battery cell in the energy storage system max When the temperature is less than or equal to 25℃, the control module continues to set the maximum temperature difference t of the battery cells in the current energy storage system. dmax Is it satisfied: t dmax <5℃; When the maximum temperature difference of the battery cells in the current energy storage system is t dmax When the temperature is less than 5℃, the control module continues to judge t dmax Is it satisfied: t dmax <2℃; When judging the maximum temperature difference t of the battery cells in the current energy storage system dmax When the temperature is ≥2℃, the control module controls all the first valves 4 and the second valves 5 to be open, and controls the water pumps of the first liquid cooling unit 1 and the second liquid cooling unit 2 to work, and the compressors of the first liquid cooling unit 1 and the second liquid cooling unit 2 to stop working, so that the thermal management system is in self-circulation mode.

[0080] In this embodiment, when the maximum temperature t of the battery cell in the current energy storage system is determined max When the temperature is ≤25℃, it is judged that the overall temperature of the current energy storage system is moderate, and the maximum temperature difference of the battery cells in the current energy storage system is 2℃≤t dmax When the temperature is less than 5°C, that is, when it is determined that the temperature in the current energy storage system is relatively low, the thermal management system is controlled to be in a self-circulation mode.

[0081] Therefore, since the maximum temperature difference of the battery cells in the current energy storage system is relatively small, by opening all the first valves 4 and the second valves 5, the flow rate of the coolant flowing to each battery cluster 3 is increased, which is conducive to making the temperature of the battery cells in each battery cluster 3 approach the temperature of the coolant, thereby achieving further temperature uniformity. Compared with the other modes mentioned above, the self-circulation mode of the thermal management system can effectively reduce the operating energy consumption.

[0082] In one possible implementation, Figure 1 As shown, the control method of the thermal management system of the energy storage system also includes: When the maximum temperature of the battery cell in the current energy storage system is t max Satisfaction: 25℃<t max When the temperature is less than 37℃, the control module continues to judge the maximum temperature difference t of the battery cells in the current energy storage system. dmax Is it satisfied: t dmax <5℃; When the maximum temperature difference of the battery cells in the current energy storage system is t dmax When the temperature is less than 5℃, all first valves 4 are opened, and the control module controls all second valves 5 to be closed, and controls the second liquid cooling unit 2 to stop running, that is, the water pump and compressor of the second liquid cooling unit 2 do not work, the water pump and compressor of the first liquid cooling unit 1 are working, and the first liquid cooling unit 1 runs at power P, so that the thermal management system is in single-machine cooling mode.

[0083] In this embodiment, when it is determined that the maximum temperature of the battery cell in the current energy storage system is 25°C < t max When the temperature is less than 37℃, it is determined that the overall temperature of the current energy storage system is slightly higher, and the maximum temperature difference t of the battery cells in the current energy storage system is dmax When the temperature is less than 5°C, that is, when it is determined that the temperature in the current energy storage system is relatively low, the thermal management system is controlled to be in a single-machine cooling mode.

[0084] Therefore, since the maximum temperature difference of the battery cells in the current energy storage system is small, only all the first valves 4 are opened, and the first liquid cooling unit 1 cools all the battery clusters 3 to reduce the overall temperature of the battery device, improve the operating performance of the battery device in the energy storage system, and reduce energy consumption.

[0085] In addition, if Figure 7 As shown, when it is determined that the thermal management system needs to be in the single-unit cooling mode, the control method of the thermal management system of the energy storage system further includes: The control module can determine and execute the following steps: Determine the maximum temperature t of the battery cell in the current energy storage system max Satisfaction: t cn ≤t max ≤t dn When the first liquid cooling unit 1 is powered by power P n Run and continue to judge the maximum temperature t of the battery cell in the current energy storage system max Is it satisfied: t max <t cn ; When judging the maximum temperature t of the battery cell in the current energy storage system max <t cn When the first liquid cooling unit 1 is controlled to operate at power Pn-k Run, continue to judge t max Is it satisfied: t max <t cn-k ;or, When judging the maximum temperature t of the battery cell in the current energy storage system max Satisfaction: t cn ≤t max ≤t dn When the first liquid cooling unit 1 is controlled to still operate at power P n run; When judging the maximum temperature t of the battery cell in the current energy storage system max <t cn-k , and satisfy t max When the minimum set temperature is not reached, the first liquid cooling unit 1 is controlled to operate at power P n-k-1 run; When judging the maximum temperature t of the battery cell in the current energy storage system max <t cn-k , and satisfy t max When the minimum set temperature is reached, the first liquid cooling unit 1 is controlled to stop working; When judging the maximum temperature t of the battery cell in the current energy storage system max Satisfaction: t cn-k ≤t max ≤t dn-k When the first liquid cooling unit 1 is controlled to still operate at power P n-k run; Among them, satisfy: t dn >t cn >t dn-k >t cn-k , and P n >P n-k >P n-k-1 , n is a positive integer greater than 1, and k is a positive integer ≥ 1 and less than n.

[0086] It should be noted that P includes the above-mentioned P1, P2, ... P n-k-1 、P n-k 、……P n The battery management system of the control module can be based on the maximum temperature difference t of the battery cell in the current energy storage system. dmax , adjust the operating power P of the first liquid cooling unit 1, and improve the reliability and feasibility of adjusting the operating power of the first liquid cooling unit 1.

[0087] When k is equal to 1, it satisfies: 2℃<t cn -t cn-k <6℃, and / or, 2℃<t dn -t dn-k <6℃.

[0088] Optionally, when k is equal to 1, the following conditions are satisfied: 2°C < t cn -t cn-k <6℃,t cn -t cn-k The value can be 2℃, 2.2℃, 2.4℃, 2.5℃, 2.6℃, 2.8℃, 3.0℃, 3.2℃, 3.4℃, 3.5℃, 3.6℃, 3.8℃, 4.0℃, 4.2℃, 4.4℃, 4.5℃, 4.6℃, 4.8℃, 5.0℃, 5.2℃, 5.4℃, 5.5℃, 5.6℃, 5.8℃, 6.0℃, etc., or other values within the above range, which is not limited in this embodiment.

[0089] Optionally, when k is equal to 1, the following conditions are satisfied: 2°C < t dn -t dn-k <6℃,t dn -t dn-k The value can be 2℃, 2.2℃, 2.4℃, 2.5℃, 2.6℃, 2.8℃, 3.0℃, 3.2℃, 3.4℃, 3.5℃, 3.6℃, 3.8℃, 4.0℃, 4.2℃, 4.4℃, 4.5℃, 4.6℃, 4.8℃, 5.0℃, 5.2℃, 5.4℃, 5.5℃, 5.6℃, 5.8℃, 6.0℃, etc., or other values within the above range, which is not limited in this embodiment.

[0090] The steps and adjustment principles for adjusting the operating power of the first liquid cooling unit 1 when the thermal management system is in single-machine refrigeration mode are the same as the steps and adjustment principles for adjusting the operating power of the first liquid cooling unit 1 when the thermal management system is in dual-machine adaptive refrigeration mode, so they will not be repeated here.

[0091] Therefore, by judging the current t max Whether the preset maximum temperature range is met in descending order, and then the operating power P of the first liquid cooling unit 1 is controlled according to the corresponding preset maximum temperature range, so that the first liquid cooling unit 1 can achieve multi-level power adjustment in the single-machine cooling mode, which is beneficial to reducing the energy consumption of the thermal management system and is also beneficial to accurately control the current t max Lowering the target temperature value improves the accuracy and stability of the thermal management system used to regulate the battery devices of the energy storage system to maintain the optimal operating temperature.

[0092] In one possible implementation, Figure 1 As shown, the control method of the thermal management system of the energy storage system also includes: When the maximum temperature of the battery cell in the current energy storage system is t max Not satisfied: 25℃<t max When the temperature is less than 37℃, continue to judge the maximum temperature of the battery cell in the energy storage system t maxWhether it meets the following conditions: tmax≤25℃; When judging the maximum temperature t of the battery cell in the energy storage system max When ≤25℃, continue to determine the maximum temperature difference t of the battery cells in the current energy storage system dmax Is it satisfied: t dmax <5℃; When the maximum temperature difference of the battery cells in the current energy storage system is t dmax When <5℃, continue to judge t dmax Is it satisfied: t dmax <2℃; When the maximum temperature difference of the battery cells in the current energy storage system is t dmax When the temperature is less than 2°C, the first liquid cooling unit 1 and the second liquid cooling unit 2 are controlled to stop working, that is, the water pumps and compressors of the first liquid cooling unit 1 and the second liquid cooling unit 2 are not working, so that the thermal management system is in a static mode.

[0093] In this embodiment, when the maximum temperature t of the battery cell in the current energy storage system is determined max When the temperature is ≤25℃, it is judged that the overall temperature of the current energy storage system is moderate, and the maximum temperature difference t of the battery cells in the current energy storage system is dmax When the temperature is less than 2°C, it is determined that the temperature in the current energy storage system is moderate. At this time, the temperature of each cell of the battery device of the energy storage system is at the normal operating temperature and the temperature is uniform. No cooling is required, so the first liquid cooling unit 1 and the second liquid cooling unit 2 are controlled to stop working, so that the thermal management system is in a static mode, so that the discharge rate and voltage of the battery device are moderate, and the operating performance of the battery device in the energy storage system is improved.

[0094] In summary, the thermal management system of the energy storage system provided in this application has six modes: self-circulation mode, dual-machine adaptive cooling mode, dual-machine full-power cooling mode, single-machine cooling mode, single-machine adaptive cooling mode and static mode, so that the thermal management system can switch modes in real time according to the current battery cell temperature of the battery device, which is conducive to precise temperature control and temperature uniformity, while reducing the energy consumption of the energy storage system and reducing the cost of use.

[0095] In one possible implementation, Figure 8 As shown, the first valve 4 is a ball valve, and the second valve 5 is a solenoid valve.

[0096] Among them, when the thermal management system is in any of the self-circulation mode, dual-machine adaptive cooling mode, dual-machine full-power cooling mode, single-machine cooling mode, and single-machine adaptive cooling mode, all first valves 4 are opened by default, and the opening degree is 100%. The first valve 4 is a ball valve, so that the resistance of the coolant flowing through the first valve 4 is reduced, energy consumption loss is reduced, the overall cooling capacity of the energy storage system is improved, and the temperature uniformity of each battery cluster 3 is improved. At the same time, the ball valve has a simple structure, is easy to maintain, and reduces production and maintenance costs.

[0097] Furthermore, the second valve 5 is a solenoid valve with an adjustable opening, enabling a faster response and prompt cooling of the battery cluster 3 containing the hottest cells, thereby achieving rapid temperature equalization for the energy storage system. Simultaneously, while the opening of the first valve 4 remains unchanged (all openings are 100%), the opening of the second valve 5 is adjusted to fine-tune the flow rate of the battery cluster 3 corresponding to the opening of the second valve 5. This means that increasing the flow rate of a particular battery cluster 3 through the second valve 5 will not affect the flow rate of other battery clusters 3 corresponding to the unopened second valve 5, nor will it affect the cooling capacity of these other battery clusters 3, thereby improving the feasibility and reliability of achieving temperature equalization across all battery clusters 3.

[0098] In one possible implementation, when the thermal management system is in a dual-machine adaptive cooling mode or a single-machine adaptive cooling mode, the opening size of the second valve 5 can increase or decrease along with the change in the operating power of the second liquid cooling unit 2, thereby increasing the rate at which the second liquid cooling unit 2 controls the battery cluster 3 where the highest temperature battery cell is located to adjust to the target temperature, so as to achieve rapid temperature equalization of the energy storage system.

[0099] In another possible embodiment, the first valve 4 may also be a solenoid valve. When the thermal management system is in dual-machine adaptive cooling mode, the opening of the first valve 4 may increase or decrease in conjunction with changes in the operating power of the second liquid cooling unit 2, thereby increasing the rate at which the first liquid cooling unit 1 controls all battery clusters 3 to the target temperature, thereby achieving rapid cooling of the energy storage system. Furthermore, when the thermal management system is in single-machine adaptive cooling mode, the opening of the first valve 4 may also be adjusted. If the temperature of battery clusters 3 other than the battery cluster 3 currently being cooled by the second liquid cooling unit 2 suddenly rises, the opening of the first valve 4 corresponding to the battery clusters 3 other than the battery cluster 3 currently being cooled by the second liquid cooling unit 2 may be increased to achieve rapid cooling.

[0100] In a possible implementation, the rated power of the first liquid cooling unit 1 is greater than the rated power of the second liquid cooling unit 2 .

[0101] In this embodiment, since the first liquid cooling unit 1 is used to cool the battery clusters 3 in the entire energy storage system, and the second liquid cooling unit 2 is used to cool the battery cluster 3 where the battery cell with the current highest temperature is located, the rated power of the first liquid cooling unit 1 is greater than the rated power of the second liquid cooling unit 2, which is beneficial to reducing energy consumption and reducing the risk of over-cooling of the battery cluster 3 where the battery cell with the current highest temperature is located.

[0102] The present application also provides an energy storage system, which includes the control method of the thermal management system of the energy storage system in any of the above embodiments.

[0103] The energy storage system includes a thermal management system, the battery device includes a plurality of battery clusters 3, each battery cluster 3 includes a plurality of battery cells, each battery cluster 3 includes a first water inlet, a second water inlet and a water outlet, the liquid cooling pipeline includes a plurality of first water inlet pipelines 6, a plurality of second water inlet pipelines 7 and a plurality of water outlet pipelines 8, the first water inlet pipeline 6 is used to connect the first water inlet with the first liquid cooling unit 1, the second water inlet pipeline 7 is used to connect the second water inlet with the second liquid cooling unit 2, the water outlet pipeline 8 is used to connect the water outlet with the first liquid cooling unit 1 and the second liquid cooling unit 2, and the plurality of first valves 4 are provided Between each first water inlet pipe 6 and each first water inlet, a plurality of second valves 5 are provided between each second water inlet pipe 7 and each second water inlet, so that the first liquid cooling unit 1 and the second liquid cooling unit 2 are connected in parallel, so that the first liquid cooling unit 1 and the second liquid cooling unit 2 can cool the battery cluster 3 independently. Even when the operating power of the second liquid cooling unit 2 or the flow of coolant flowing to a part of the battery cluster 3 changes, it will not affect the first liquid cooling unit 1, thereby reducing the risk of a reduction in the overall cooling capacity of the energy storage system, so as to achieve rapid temperature equalization of the energy storage system and to be at the optimal operating temperature. The above description is only a specific implementation method of the embodiment of the present application, but the protection scope of the embodiment of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in the embodiment of the present application should be covered within the protection scope of the embodiment of the present application. Therefore, the protection scope of the embodiment of the present application should be based on the protection scope of the claims.

Claims

1. A control method for a thermal management system of an energy storage system, characterized in that: The thermal management system includes at least: a first liquid cooling unit, a second liquid cooling unit, a plurality of liquid cooling pipelines, and a plurality of first and second valves. The first liquid cooling unit and the second liquid cooling unit are respectively connected in parallel with the plurality of battery clusters of the energy storage system via the plurality of liquid cooling pipelines. The first valve is connected between the first liquid cooling unit and the water inlets of the plurality of battery clusters of the energy storage system. The second valve is connected between the second liquid cooling unit and another water inlet of the plurality of battery clusters of the energy storage system. The first liquid cooling unit and the second liquid cooling unit are connected in parallel. The control method of the thermal management system of the energy storage system comprises at least the following steps: Get the maximum temperature t of the battery cell in the current energy storage system max , and determining the current state of the thermal management system; Determine the maximum temperature t of the battery cell in the current energy storage system max Whether it meets: 25℃<t max <37℃; When the maximum temperature of the battery cell in the current energy storage system is t max Not satisfied: 25℃<t max When the temperature is less than 37℃, continue to judge the maximum temperature of the battery cell in the energy storage system t max Is it satisfied: t max ≤25℃; When the maximum temperature of the battery cell in the current energy storage system is t max When ≤25℃, calculate the maximum temperature difference t of the battery cells in the current energy storage system dmax , and determine the maximum temperature difference t of the battery cells in the current energy storage system dmax Is it satisfied: t dmax <5℃; When the maximum temperature difference of the battery cells in the current energy storage system is t dmax When the temperature is ≥5°C, the battery cluster where the battery cell with the highest temperature in the energy storage system is located is determined and located, all first valves are opened, the water pump of the first liquid cooling unit is controlled to operate, at least the second valve connected to the battery cluster where the battery cell with the highest temperature is located is opened, and the second liquid cooling unit is operated at a power of W, so that the thermal management system is in a single-machine adaptive cooling mode.

2. The control method of the thermal management system of the energy storage system according to claim 1, characterized in that: The control method of the thermal management system of the energy storage system further includes: When the maximum temperature of the battery cell in the current energy storage system is t max Satisfaction: 25℃<t max When the temperature is less than 37℃, continue to determine the maximum temperature difference t of the battery cells in the current energy storage system. dmax Is it satisfied: t dmax <5℃; When the maximum temperature difference of the battery cells in the current energy storage system is t dmax When the temperature is ≥5°C, the battery cluster where the battery cell with the highest temperature is located is determined and located, all the first valves are opened, the water pumps and compressors of the first liquid cooling unit and the second liquid cooling unit are controlled to operate, at least the second valve connected to the battery cluster where the battery cell with the highest temperature is located is opened, and the first liquid cooling unit operates at a power of M and the second liquid cooling unit operates at a power of W, so that the thermal management system is in a dual-machine adaptive cooling mode.

3. The control method of the thermal management system of the energy storage system according to claim 1, characterized in that: The control method of the thermal management system of the energy storage system further includes: When the maximum temperature of the battery cell in the current energy storage system is t max Not satisfied: 25℃<t max When the temperature is less than 37℃, continue to judge the maximum temperature of the battery cell in the energy storage system t max Is it satisfied: t max ≤25℃; When judging the maximum temperature t of the battery cell in the current energy storage system max When the temperature is ≥25℃, continue to determine the maximum temperature difference t of the battery cells in the current energy storage system. dmax Is it satisfied: t dmax <5℃; When the maximum temperature difference of the battery cells in the current energy storage system is t dmax When the temperature is ≥5°C, the battery cluster where the battery cell with the highest temperature is located is determined and located, all the first valves are opened, the water pumps and compressors of the first liquid cooling unit and the second liquid cooling unit are controlled to operate, at least the second valve connected to the battery cluster where the battery cell with the highest temperature is located is opened, and the first liquid cooling unit operates at a power of M and the second liquid cooling unit operates at a power of W, so that the thermal management system is in a dual-machine adaptive cooling mode.

4. The control method of the thermal management system of the energy storage system according to claim 1, characterized in that: The control method of the thermal management system of the energy storage system further includes: calculating the average temperature t of all battery cells in the current energy storage system. mean , and according to the formula: , calculate the maximum temperature difference t of the battery cells in the current energy storage system dmax .

5. The control method for the thermal management system of the energy storage system according to claim 2 or 3, characterized in that: When the thermal management system is in the dual-machine adaptive cooling mode or the single-machine adaptive cooling mode, at time K2 t rmax Not equal to t max When the control method of the thermal management system of the energy storage system further includes: calculating the average temperature t of all the battery cells in the current energy storage system mean , according to the formula: , calculate the maximum temperature difference t of the battery cells in the energy storage system dmax1 ; Among them, t mean is the average temperature of all cells in the current energy storage system, t rmax The current maximum temperature of the battery cell in the battery cluster where the battery cell with the highest temperature in the energy storage system is located at the K1 moment, and at the K1 moment t rmax Equal to t max .

6. The control method for the thermal management system of the energy storage system according to claim 2 or 3, characterized in that: When it is determined that the thermal management system needs to be in the single-machine adaptive cooling mode or the dual-machine adaptive cooling mode, the control method of the thermal management system of the energy storage system further includes: When judging the maximum temperature difference t of the battery cells in the current energy storage system dmax Satisfaction: t sn ≤t dmax ≤t fn When the second liquid cooling unit is powered by W n Run and continue to determine the maximum temperature difference t of the battery cells in the current energy storage system dmax Is it satisfied: t dmax <t sn ; When the maximum temperature difference of the battery cells in the current energy storage system is t dmax <t sn When the second liquid cooling unit is controlled to have a power of W n-k Run and continue to determine the maximum temperature difference t of the battery cells in the current energy storage system dmax Is it satisfied: t dmax <t sn-k ; or, when the maximum temperature difference of the battery cells in the current energy storage system is t dmax Still satisfied: t sn ≤t dmax ≤t fn When the second liquid cooling unit is controlled to still operate at power W n Continue running; When judging the maximum temperature difference t of the battery cells in the current energy storage system dmax <t sn-k , and satisfy t dmax When the minimum preset temperature difference is not reached, the second liquid cooling unit is controlled to operate at a power of W n-k-1 run; When judging the maximum temperature difference t of the battery cells in the current energy storage system dmax <t sn-k , and satisfy t dmax When the minimum preset temperature difference is reached, the second liquid cooling unit is controlled to stop working; When judging t fn-k ≥t dmax ≥t sn-k When the second liquid cooling unit is controlled to still operate at power W n-k run; Among them, satisfy: t fn >t sn >t fn-k >t sn-k , and W n >W n-k >W n-k-1 , n is a positive integer greater than 1, and k is a positive integer ≥ 1 and less than n.

7. The control method for the thermal management system of the energy storage system according to claim 6, characterized in that: When k is equal to 1, it satisfies: 1℃<t sn -t sn-k <2.5℃, and / or, 1℃<t fn -t fn-k <2.5℃.

8. The control method for a thermal management system of an energy storage system according to claim 2 or 3, characterized in that: When it is determined that the thermal management system needs to be in the dual-machine adaptive cooling mode, the control method of the thermal management system of the energy storage system further includes: Determine the maximum temperature t of the battery cell in the current energy storage system max Satisfaction: t an ≤t max ≤t bn When the first liquid cooling unit is powered by M n Run and continue to judge the maximum temperature t of the battery cell in the current energy storage system max Is it satisfied: t max <t an ; When judging the maximum temperature t of the battery cell in the current energy storage system max <t an When the first liquid cooling unit is controlled to have a power of M n-k Run, continue to judge t max Is it satisfied: t max <t an-k ;or, When judging the maximum temperature t of the battery cell in the current energy storage system max Satisfaction: t an ≤t max ≤t bn When the first liquid cooling unit is controlled to still operate at power M n run; When judging the maximum temperature t of the battery cell in the current energy storage system max <t an-k , and satisfy t max When the minimum set temperature is not reached, the first liquid cooling unit is controlled to operate at power M n-k-1 run; When judging the maximum temperature t of the battery cell in the current energy storage system max <t an-k , and satisfy t max When the minimum set temperature is reached, the first liquid cooling unit is controlled to stop working; When judging the maximum temperature t of the battery cell in the current energy storage system max Satisfaction: t an-k ≤t max ≤t bn-k When the first liquid cooling unit is controlled to still operate at power M n-k run; Among them, satisfy: t bn >t an >t bn-k >t an-k , and M n >M n-k >M n-k-1 , n is a positive integer greater than 1, and k is a positive integer ≥ 1 and less than n.

9. The control method for the thermal management system of the energy storage system according to claim 8, characterized in that: When k is equal to 1, it satisfies: 2℃<t an -t an-k <6℃, and / or, 2℃<t bn -t bn-k <6℃.

10. The control method for a thermal management system of an energy storage system according to any one of claims 1 to 4, characterized in that: The control method of the thermal management system of the energy storage system further includes: When the maximum temperature of the battery cell in the current energy storage system is t max Not satisfied: 25℃<t max When the temperature is less than 37℃, continue to judge the maximum temperature of the battery cell in the energy storage system t max Is it satisfied: t max ≤25℃; When the maximum temperature of the battery cell in the current energy storage system is t max When the temperature is ≥25℃, continue to determine the maximum temperature difference t of the battery cells in the current energy storage system. dmax Is it satisfied: t dmax <5℃; When the maximum temperature difference of the battery cells in the current energy storage system is t dmax When the temperature is less than 5°C, the first valves and the second valves are all opened, and the water pumps and compressors of the first liquid cooling unit and the second liquid cooling unit are controlled to work, and the first liquid cooling unit and the second liquid cooling unit are both operated at rated power, so that the thermal management system is in a dual-machine full-power cooling mode.

11. The control method for a thermal management system of an energy storage system according to any one of claims 1 to 4, characterized in that: The control method of the thermal management system of the energy storage system further includes: When the maximum temperature of the battery cell in the current energy storage system is t max Not satisfied: 25℃<t max When the temperature is less than 37℃, continue to judge the maximum temperature of the battery cell in the energy storage system t max Is it satisfied: t max ≤25℃; When judging the maximum temperature t of the battery cell in the energy storage system max When the temperature is less than or equal to 25℃, the maximum temperature difference t of the battery cells in the current energy storage system will continue to be dmax Is it satisfied: t dmax <5℃; When the maximum temperature difference of the battery cells in the current energy storage system is t dmax When <5℃, continue to judge t dmax Is it satisfied: t dmax <2℃; When judging the maximum temperature difference t of the battery cells in the current energy storage system dmax When the temperature is ≥2°C, the first valves and the second valves are both opened, and the water pumps of the first liquid cooling unit and the second liquid cooling unit are controlled to operate, so that the thermal management system is in a self-circulation mode.

12. The method for controlling a thermal management system of an energy storage system according to any one of claims 1 to 4, characterized in that: The rated power of the first liquid cooling unit is greater than the rated power of the second liquid cooling unit.

13. Energy storage system, characterized in that The energy storage system includes a control method for a thermal management system of an energy storage system according to any one of claims 1 to 12; The energy storage system includes a thermal management system and a battery device, wherein the battery device includes a plurality of battery clusters, and each battery cluster includes a plurality of battery cells; Each battery cluster includes a first water inlet, a second water inlet and a water outlet. The liquid cooling pipeline includes multiple first water inlet pipelines, multiple second water inlet pipelines and multiple water outlet pipelines. The first water inlet pipeline is used to connect the first water inlet with the first liquid cooling unit, the second water inlet pipeline is used to connect the second water inlet with the second liquid cooling unit, and the water outlet pipeline is used to connect the water outlet with the first liquid cooling unit and the second liquid cooling unit.

14. The energy storage system according to claim 13, characterized in that: The battery device further includes a control module and a monitoring module, wherein the control module and the monitoring module are capable of exchanging information, and the monitoring module includes a temperature sensor, and the monitoring module determines the current state of the thermal management system; The temperature sensor is used to detect the current temperature of each battery cell and exchange the temperature information of each battery cell with the control module to obtain the maximum temperature t of the battery cell in the current energy storage system. max ; The control module is used to determine the maximum temperature t of the battery cell in the current energy storage system. max The maximum temperature difference t of the battery cells in the energy storage system is calculated. dmax , to determine the maximum temperature difference t of the battery cells in the current energy storage system dmax The relationship between the size of the preset maximum temperature difference of the battery cells in the energy storage system is used to control the operating state of the first liquid cooling unit, the operating state of the second liquid cooling unit and the state of the second valve, so that the control module controls the thermal management system to switch to different modes.

15. The energy storage system according to claim 14, characterized in that: The control module can be configured to determine the maximum temperature difference t of the battery cell in the current energy storage system. dmax , adjusting the operating power of the second liquid cooling unit; The control module can be configured to determine the maximum temperature t of the battery cell in the current energy storage system. max , adjust the operating power of the first liquid cooling unit.

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