Cold plate filth blockage judgment method, control device and energy storage system

Abstract

The invention provides a cold plate filth blockage judgment method, a control device and an energy storage system. The energy storage system comprises a liquid cooling unit and a battery device, the battery device comprises a plurality of battery packs connected in parallel, each battery pack is provided with a cold plate, and the plurality of cold plates are connected in parallel and communicated with the liquid cooling unit through a pipeline; the cold plate filth blockage judgment method comprises the steps that the inlet and outlet pressure difference P of each cold plate is determined; respectively calculating the flow qv of each cold plate according to the inlet and outlet pressure difference P of each cold plate and the flow coefficient calibration value Kv of each cold plate; and at least according to the flow qv of each cold plate, whether filth blockage occurs to each cold plate is judged. According to the scheme, the flow qv of each cold plate is calculated according to the inlet and outlet pressure difference P of each cold plate and the flow coefficient calibration value Kv of each cold plate, the flow of each cold plate can be calculated only by arranging the pressure sensors at the inlet and outlet of each cold plate to detect the inlet and outlet pressure difference, a flowmeter does not need to be additionally arranged, and therefore the production cost can be reduced.

Description

Technical Field

[0001] The present application relates to but is not limited to the technical field of energy management systems, and specifically refers to a cold plate dirt and blockage determination method, a control device, and an energy storage system. Background Art

[0002] As the economic efficiency of energy storage technology continues to improve, the role of energy storage technology in renewable energy generation, smart grid, and energy Internet construction is becoming increasingly important, and battery energy storage system is the mainstream product for realizing energy storage technology today. Battery energy storage system is an energy storage system that integrates functional components such as battery box, battery cell, cooling system, and signal acquisition device.

[0003] Existing energy storage system cooling solutions can be divided into: air cooling, liquid cooling and phase change according to the type of heat dissipation medium. Among them, liquid cooling technology can achieve precise temperature control of the battery and ensure uniformity of cooling by directly dissipating heat through liquid convection. In contrast, air cooling technology has a lower cost, but the heat dissipation efficiency is not high, and it cannot achieve precise temperature control of the battery; phase change technology is not yet mature and is expensive. Therefore, in medium and high power scenarios, liquid cooling technology occupies a dominant position.

[0004] At present, most energy storage liquid cooling systems are closed-loop systems. After long-term operation, the coolant will react with the cold plate medium to produce impurities or be doped with secondary impure coolant, causing some dead zones of the cold plate to become dirty and blocked, resulting in uneven flow distribution, which can easily cause large temperature differences in different parts of the equipment. The main methods for judging whether a cold plate is dirty and blocked in the industry are: adding a flow meter to each cluster / pack (a battery pack is also called a battery module, which is a battery pack composed of multiple single cells connected in series) in the system to detect the water flow in each channel. This approach has a high overall cost and is not conducive to economic efficiency. Summary of the invention

[0005] The technical problem to be solved by the present application is to provide a method for determining whether a cold plate is dirty or blocked, which does not require the addition of a flow meter, is beneficial to reducing costs, and is beneficial to improving economic efficiency.

[0006] The embodiment of the present application provides a cold plate dirty blockage determination method, which is applied to an energy storage system, wherein the energy storage system comprises: a liquid cooling unit and a battery device, wherein the battery device comprises a plurality of battery packs connected in parallel, each of the battery packs is provided with a cold plate, and the plurality of cold plates are connected in parallel and communicated with the liquid cooling unit through a pipeline; The cold plate dirty blockage determination method comprises: Determine the inlet and outlet pressure difference ΔP of each cold plate; Calculate the flow rate qv of each cold plate according to the inlet and outlet pressure difference ΔP of each cold plate and the flow rate coefficient calibration value Kv of the cold plate; Whether each of the cold plates is blocked by dirt is determined at least according to the flow rate qv of each of the cold plates.

[0007] When there is no dirty blockage on the cold plate, the flow capacity of each cold plate is consistent or basically consistent, and the flow rate should be consistent or basically consistent. However, when dirty blockage occurs, the flow capacity of the cold plate changes, so the flow rate will change accordingly. There will be a big difference in the flow rate between the cold plate with dirty blockage and other cold plates without dirty blockage. Therefore, according to the flow rate qv of each cold plate, it can be judged whether the cold plate is dirty blockage.

[0008] This solution calculates the flow rate qv of each cold plate through the inlet and outlet pressure difference △P of each cold plate and the flow coefficient calibration value Kv of the cold plate. It only needs to set a pressure sensor at the inlet and outlet of each cold plate to detect the inlet and outlet pressure difference, and the flow rate of each cold plate can be calculated without setting up an additional flow meter. Compared with the pressure sensor, the cost of the flow meter is much higher, and this solution does not need to set up an additional flow meter, so it is conducive to reducing production costs.

[0009] An embodiment of the present application further provides a control device, including a processor and a memory storing a computer program, wherein when the processor executes the computer program, the steps of the cold plate dirty blockage determination method as described in the above embodiment are implemented.

[0010] An embodiment of the present application also provides an energy storage system, including a liquid cooling unit, a battery device, and a control device as described in the above embodiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram of the structure of an energy storage system provided in some embodiments of the present application; Figure 2 A schematic flow chart of a cold plate dirty blockage determination method provided in some embodiments of the present application; Figure 3 A schematic flow chart of a cold plate dirty blockage determination method provided in some embodiments of the present application.

[0012] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 10 liquid cooling units; 21 a first-level liquid inlet pipeline, 22 a first-level liquid outlet pipeline, 23 a second-level liquid inlet pipeline, 24 a second-level liquid outlet pipeline, 25 a third-level liquid inlet pipeline, 26 a third-level liquid outlet pipeline, 27 a first liquid inlet valve, 28 a first liquid outlet valve. DETAILED DESCRIPTION

[0013] The principles and features of the present application are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present application and are not used to limit the scope of the present application.

[0014] The embodiments of the present application provide a cold plate dirtiness and blockage determination method, a control device, and an energy storage system.

[0015] like Figure 1 As shown, the energy storage system includes: a liquid cooling unit 10 and a battery device. The battery device includes a plurality of battery packs connected in parallel, and each battery pack is provided with a cold plate. The plurality of cold plates are connected in parallel and connected to the liquid cooling unit 10 through pipelines. The cold plate is used to control the temperature of the battery pack. The liquid cooling unit 10 transports circulating liquid to the cold plate, and the circulating liquid exchanges heat with the battery pack and then flows back to the liquid cooling unit 10 to form a liquid circulation loop. The circulating liquid can be water or a liquid to which other substances (such as antifreeze substances, anti-corrosion substances, etc.) are added. The following example takes the circulating liquid as water.

[0016] In some embodiments, Figure 1 As shown, multiple battery packs may be divided into N parallel battery clusters, each battery cluster may include n parallel battery packs, and N and n are both positive integers not less than 2. In other embodiments, multiple packs may not be divided into N parallel battery clusters. Alternatively, the number of battery packs included in the N battery clusters may not be equal or completely equal.

[0017] The following explanation is given by taking a case where a plurality of battery packs are divided into N parallel battery clusters, each battery cluster including n parallel battery packs. Accordingly, a plurality of cold plates are also divided into N parallel clusters, each cluster including n parallel cold plates.

[0018] like Figure 1 As shown, the pipeline may include a primary liquid inlet pipeline 21 and a primary liquid outlet pipeline 22. The primary liquid inlet pipeline 21 is connected to the liquid outlet of the liquid cooling unit 10, and is configured to supply liquid to the plurality of cold plates. The primary liquid outlet pipeline 22 is connected to the liquid inlet of the liquid cooling unit 10, and is configured to return the circulating liquid discharged from the plurality of cold plates to the liquid cooling unit 10.

[0019] A control valve assembly may be provided on the pipeline to control the on and off of each flow path. Figure 1As shown, the control valve assembly may include N first liquid inlet valves 27 and N first liquid outlet valves 28, a first liquid inlet valve 27 is provided between the primary liquid inlet pipeline 21 and each cluster of cold plates, and a first liquid outlet valve 28 is provided between the primary liquid outlet pipeline 22 and each cluster of cold plates. By closing the first liquid inlet valve 27 or the first liquid outlet valve 28, the flow path between all cold plates of the corresponding cluster and the liquid cooling unit 10 can be disconnected, which is conducive to preventing the flow to other clusters when there are impurities and foreign matter in the cluster, causing the cold plates of other clusters to be dirty and blocked, so as to avoid secondary pollution. Of course, closing both the first liquid inlet valve 27 and the first liquid outlet valve 28 corresponding to the same cluster of cold plates can also disconnect the flow path between all cold plates of the corresponding cluster and the liquid cooling unit 10, and can prevent the circulating liquid in the cluster from flowing to other clusters, which is more conducive to preventing the flow to other clusters when there are impurities and foreign matter in the cluster, causing the cold plates of other clusters to be dirty and blocked, so as to avoid secondary pollution.

[0020] like Figure 1 As shown, the pipeline may also include N secondary liquid inlet pipelines 23 and N secondary liquid outlet pipelines 24. The liquid inlets of all cold plates of each battery cluster are connected to the primary liquid inlet pipeline 21 through the corresponding secondary liquid inlet pipelines 23, and the liquid outlets of all cold plates of each battery cluster are connected to the primary liquid outlet pipeline 22 through the corresponding secondary liquid outlet pipelines 24. Each secondary liquid inlet pipeline 23 is provided with a first liquid inlet valve 27. Each secondary liquid outlet pipeline 24 is provided with a first liquid outlet valve 28.

[0021] like Figure 1 As shown, the pipeline may also include a plurality of tertiary liquid inlet pipelines 25 and a plurality of tertiary liquid outlet pipelines 26. Each cold plate is connected between a tertiary liquid inlet pipeline 25 and a tertiary liquid outlet pipeline 26, and is connected with the corresponding secondary liquid inlet pipeline 23 through the tertiary liquid inlet pipeline 25, and is connected with the corresponding secondary liquid outlet pipeline 24 through the tertiary liquid outlet pipeline 26. A second liquid inlet valve 29 may be provided on each tertiary liquid inlet pipeline 25, and a second liquid outlet valve may be provided on each tertiary liquid outlet pipeline 26. The second liquid inlet valve 29 and the second liquid outlet valve may be provided separately, or both may be provided, so as to control the on and off of a single cold plate.

[0022] like Figure 1 As shown, a liquid inlet temperature sensor and a liquid outlet temperature sensor are respectively provided at the inlet of the first-level liquid inlet pipeline 21 and the outlet of the first-level liquid outlet pipeline 22 to respectively detect the liquid inlet temperature Tin (i.e., the liquid outlet temperature Two of the liquid cooling unit 10) and the liquid outlet temperature Tout (i.e., the liquid inlet temperature Twi of the liquid cooling unit 10) of the battery device, thereby obtaining the system temperature difference of the battery device, which is the system temperature difference = the liquid outlet temperature Tout of the battery device - the liquid inlet temperature Tin of the battery device.

[0023] A liquid inlet pressure sensor (not shown in the figure) and a liquid outlet pressure sensor (not shown in the figure) are respectively provided at the inlet and outlet of each cold plate to detect the liquid inlet pressure and liquid outlet pressure of each cold plate respectively, thereby obtaining the inlet and outlet pressure difference △P of each cold plate, △P=liquid inlet pressure of the cold plate-liquid outlet pressure of the cold plate.

[0024] A liquid inlet temperature sensor (not shown in the figure) and a liquid outlet temperature sensor (not shown in the figure) are respectively provided at the inlet and outlet of each cold plate to detect the liquid inlet temperature and liquid outlet temperature of each cold plate respectively, thereby obtaining the inlet and outlet temperature difference △T of each cold plate, △T=the liquid outlet temperature of the cold plate-the liquid inlet temperature of the cold plate.

[0025] like Figure 2 As shown in the figure, the cold plate dirty blockage determination method includes: Step S202: determining the inlet and outlet pressure difference ΔP of each cold plate; Step S204: Calculate the flow rate qv of each cold plate according to the inlet and outlet pressure difference ΔP of each cold plate and the flow rate coefficient calibration value Kv of the cold plate; Step S206: judging whether each cold plate is blocked by dirt at least according to the flow rate qv of each cold plate.

[0026] When there is no dirty blockage on the cold plate, the flow capacity of each cold plate is consistent or basically consistent, and the flow rate should be consistent or basically consistent. However, when dirty blockage occurs, the flow capacity of the cold plate changes, so the flow rate will change accordingly. There will be a big difference in the flow rate between the cold plate with dirty blockage and other cold plates without dirty blockage. Therefore, according to the flow rate qv of each cold plate, it can be judged whether the cold plate is dirty blockage.

[0027] This solution calculates the flow rate qv of each cold plate through the inlet and outlet pressure difference △P of each cold plate and the flow coefficient calibration value Kv of the cold plate. It only needs to set a pressure sensor at the inlet and outlet of each cold plate to detect the inlet and outlet pressure difference, and the flow rate of each cold plate can be calculated without setting up an additional flow meter. Compared with the pressure sensor, the cost of the flow meter is much higher, and this solution does not need to set up an additional flow meter, so it is conducive to reducing production costs.

[0028] Among them, the calculation formula of the flow coefficient Kv value is: , so Where ρ is the measured density of the circulating fluid, in g / cm 3 , which can be obtained from the preset circulating fluid density-temperature table or density-temperature curve; ρ0 is the density of the circulating fluid at 60°F. When the circulating fluid is water, ρ0=1g / cm 3;△P0=0.1MPa,△P is the measured inlet and outlet pressure difference. When the circulating fluid is other fluids, the parameters such as ρ, ρ0, flow coefficient calibration value Kv can be adjusted accordingly. Therefore, according to the inlet and outlet pressure difference △P of each cold plate and the flow coefficient calibration value Kv, substitute them into the calculation formula of qv, and the flow rate qv of each cold plate can be calculated.

[0029] It should be noted that the Kv calibration value of the cold plate refers to the Kv value calibrated when the cold plate leaves the factory, which indicates the flow capacity when the cold plate is not blocked by dirt. However, during use, if the cold plate is blocked by dirt, the flow capacity will be reduced, the actual Kv value will be reduced accordingly, the inlet and outlet pressure difference △P will increase accordingly, and the actual flow qv will be reduced accordingly. Therefore, the actual flow of the dirty blocked cold plate should be less than the flow of the cold plate without dirty blockage.

[0030] However, this scheme calculates the flow rate of each cold plate according to the Kv calibration value of the cold plate. Since the Kv calibration value of the dirty and blocked cold plate is greater than the actual Kv value, and the inlet and outlet pressure difference △P of the dirty and blocked cold plate is greater than the inlet and outlet pressure difference △P of the cold plate without dirty and blocked cold plate, the calculated flow rate qv of the dirty and blocked cold plate is greater than the flow rate of the cold plate without dirty and blocked cold plate.

[0031] Therefore, the calculated flow rate qv of the dirty and blocked cold plate is not the actual flow rate, but it can still reflect that the flow rate of the dirty and blocked cold plate deviates from the flow rate of the cold plate without dirty and blocked, so it can be used to qualitatively judge whether the cold plate is dirty and blocked.

[0032] In some exemplary embodiments, Figure 3 As shown, at least according to the flow rate qv of each cold plate, it is judged whether each cold plate is dirty and blocked, including: Based on the fact that the battery device is not in a charging or discharging state, it is determined whether each cold plate is dirty or blocked according to the flow rate qv of each cold plate; Based on the battery device being in a charging and discharging state, it is determined whether each cold plate is dirty or blocked according to the temperature of the liquid connecting the battery device and the liquid cooling unit 10 and the flow rate qv of each cold plate.

[0033] In the non-charging and discharging state, the main reason for abnormal cold plate flow is that the cold plate itself is dirty and blocked, so the flow of each cold plate can be used to determine whether each cold plate is dirty and blocked. In the charging and discharging state, some battery packs have local overtemperature, which will cause different water temperatures in the cold plate and affect the cold plate flow. Therefore, combining temperature and flow to jointly determine whether the cold plate is dirty and blocked has higher accuracy and reliability.

[0034] There is also a practice in the industry to determine whether the cold plate is dirty or blocked by judging the temperature difference before and after each cluster / pack. The main disadvantage of this method is that it must be judged by the abnormal temperature difference before and after during the entire system charging and discharging process. It cannot be judged in advance, has low efficiency and a high risk of thermal runaway.

[0035] The cold plate dirty blockage judgment method provided in the embodiment of the present application can perform a cold plate dirty blockage self-check judgment when the battery device has not entered the charge and discharge state, that is, it can judge whether the cold plate is dirty and blocked when the self-circulation mode is operated alone before the energy storage system is coordinated. It is more efficient and has the ability to predict cold plate dirty blockage, which is conducive to reducing the risk of thermal runaway. When the battery device enters the charge and discharge state, the cold plate dirty blockage judgment can be performed in combination with the temperature and the inlet and outlet pressure difference.

[0036] Therefore, the cold plate dirty blockage determination method provided in the embodiment of the present application can determine whether the cold plate is dirty or blocked when the self-circulation mode is operated alone before the energy storage system is coordinated, and can also determine whether the cold plate is dirty or blocked during the charging and discharging process of the battery device. It has both predictive and real-time determination capabilities, which is beneficial to reducing the risk of thermal runaway and improving the safety of the energy storage system.

[0037] Among them, each cold plate is in parallel, and whether each cold plate is dirty or blocked is also judged separately, but the judgment process of whether each cold plate is dirty or blocked requires the flow rate qv of all cold plates at the same detection time. When it is determined that a certain cold plate is dirty or blocked at the current detection time, the corresponding control valve can be closed. When it is determined that a certain cold plate is not dirty or blocked at the current time, it can continue to judge whether the cold plate is dirty or blocked at the next detection time.

[0038] In some exemplary embodiments, Figure 3 As shown, according to the flow rate qv of each cold plate, it is judged whether each cold plate is dirty or blocked, including: According to the flow rate qv of each cold plate, calculate the average flow rate qvave; Compare the flow rate qv of each cold plate with the average flow rate qvave one by one; Based on the comparison result satisfying the set dirty blocking condition, it is determined that the cold plate whose comparison result satisfies the set dirty blocking condition is dirty blocked; Based on the comparison result not satisfying the set dirty blocking condition, it is determined that the cold plate whose comparison result satisfies the set dirty blocking condition is not dirty blocked and the process returns to the step of determining the inlet and outlet pressure difference ΔP of each cold plate.

[0039] In actual use, generally only a small number of cold plates are blocked by dirt, and a large number of cold plates will not be blocked at the same time. Therefore, the average flow rate qvave can represent the average flow rate of a normal cold plate at this time, that is, the normal flow rate when the cold plate is not blocked by dirt. If the flow rate qv of a cold plate deviates seriously from the average flow rate qvave, it means that the cold plate is abnormal, and it can be determined that the cold plate is blocked by dirt. Therefore, based on the comparison results of the flow rate qv of each cold plate and the average flow rate qvave, it can be determined whether each cold plate is blocked by dirt.

[0040] In addition, since there are a large number of cold plates, using the average flow rate qvave as the comparison benchmark is beneficial to avoid excessive comparison benchmark errors caused by excessive flow calculation errors of a single cold plate, thereby improving the accuracy and reliability of the comparison benchmark, and further improving the accuracy and reliability of cold plate dirty blockage judgment.

[0041] In some exemplary embodiments, Figure 3 As shown, the dirty and blocked conditions are set to include: |qv-qvave| / qvave≥εp, εp is the first set threshold, εp>0.

[0042] |qv-qvave| can indicate the deviation of the flow rate of the cold plate from the average flow rate, and |qv-qvave| / qvave indicates the ratio of the deviation of the flow rate of the cold plate from the average flow rate to the average flow rate, which can indicate the degree of deviation of the flow rate of the cold plate from the normal flow rate when no dirty blockage occurs. The greater the deviation, the greater the flow abnormality of the cold plate (i.e., |qv-qvave| / qvave≥εp), and it can be determined that dirty blockage occurs; the smaller the deviation (i.e., |qv-qvave| / qvave<εp), the smaller the flow abnormality of the cold plate, and it can be determined that no dirty blockage occurs.

[0043] Moreover, the size of εp is not restricted and can be reasonably set as needed. For example, εp can be in the range of (0, 1), such as 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, etc., or in a range greater than 1.

[0044] In some embodiments, Figure 3 As shown, setting the dirty blockage condition also includes: the duration of |qv-qvave| / qvave≥εp reaches a first set duration ts1.

[0045] In other words, when the flow abnormality of the cold plate is relatively large and lasts for a certain period of time, it is determined that the cold plate is dirty and blocked. This helps to avoid misjudgment of cold plate blockage due to accidental factors or other errors, and helps to improve the accuracy and reliability of cold plate blockage judgment.

[0046] In some embodiments, 1min≤ts1≤10min, such as 1min, 2min, 3min, 4min, 5min, 6min, 7min, 8min, 9min, 10min, etc.

[0047] Of course, ts1 is not limited to the above range and can be adjusted as needed.

[0048] In some exemplary embodiments, Figure 3 As shown, according to the temperature of the liquid connecting the battery device and the liquid cooling unit 10 and the flow rate qv of each cold plate, it is judged whether each cold plate is blocked by dirt, including: Based on the liquid temperature of the battery device satisfying the first set temperature condition, the step of determining whether the liquid temperature of the battery device satisfies the first set temperature condition may be returned to be executed; Based on the liquid temperature of the battery device satisfying the first set temperature condition, determining the inlet and outlet temperature difference ΔT of each cold plate; According to the inlet and outlet temperature difference △T of each cold plate and the flow rate qv of each cold plate, it is judged whether each cold plate is blocked by dirt.

[0049] The inlet and outlet temperature difference △T of each cold plate can accurately indicate whether the temperature of each cold plate is abnormal, which is convenient for accurately locating the cold plate with abnormal temperature, so as to make a targeted judgment on the dirtiness and blockage of the cold plate with abnormal temperature.

[0050] In some exemplary embodiments, the liquid temperature of the battery device includes: a liquid inlet temperature Tin of a primary liquid inlet pipeline 21 , and a liquid outlet temperature Tout of a primary liquid outlet pipeline 22 .

[0051] like Figure 3 As shown, the first set temperature condition includes: Tout-Tin>ΔTs, ΔTs is the set temperature threshold, ΔTs>0° C. Tout-Tin can be called the system temperature difference.

[0052] When Tout-Tin>△Ts, it indicates that the outlet temperature of the battery device is much higher than the inlet temperature, that is, the system temperature difference is very large, which indicates that the battery device may have local high temperature phenomenon, so the possibility of cold plate dirty blockage is high, so it is necessary to determine the cold plate dirty blockage.

[0053] The specific value of ΔTs is not limited and can be reasonably set as needed. In one example, ΔTs is in the range of 10°C to 20°C, such as 10°C, 12°C, 14°C, 16°C, 18°C, 20°C, etc.

[0054] In some embodiments, Figure 3 As shown, the first set temperature condition also includes: the duration of Tout-Tin>ΔTs reaches a second set duration ts2.

[0055] In other words, when the system temperature difference is relatively large and lasts for a certain period of time, it is determined that the cold plate is dirty and blocked. This is conducive to avoiding misjudgment caused by accidental factors or other errors, and is conducive to improving the accuracy and reliability of the cold plate dirty and blocked judgment.

[0056] In some embodiments, 1min≤ts2≤10min, such as 1min, 2min, 3min, 4min, 5min, 6min, 7min, 8min, 9min, 10min, etc.

[0057] Of course, ts2 is not limited to the above range and can be adjusted as needed.

[0058] In some exemplary embodiments, Figure 3 As shown, according to the inlet and outlet temperature difference △T of each cold plate and the flow rate qv of each cold plate, it is judged whether each cold plate is dirty and blocked, including: According to the inlet and outlet temperature difference △T of each cold plate, it is judged whether each cold plate meets the second set temperature condition; Based on the cold plate not meeting the second set temperature condition, determining that the cold plate not meeting the second set temperature condition is not dirty or blocked, and returning to the step of determining the inlet and outlet temperature difference ΔT of each cold plate; Based on the cold plate satisfying the second set temperature condition, it is determined whether dirt blockage occurs on the cold plate satisfying the second set temperature condition according to the flow rate qv of each cold plate.

[0059] When the inlet and outlet temperature difference △T of a certain cold plate meets the second set temperature condition, it indicates that the temperature of the cold plate is abnormal and the possibility of dirty blockage is high. Therefore, it is necessary to further combine the flow rate qv to determine whether dirty blockage occurs.

[0060] When the inlet and outlet temperature difference △T of a certain cold plate does not meet the second set temperature condition, it indicates that the temperature of the cold plate is normal and the possibility of dirty blockage is low, so it can be determined that dirty blockage has not occurred.

[0061] In this way, during the charging and discharging process, only the cold plate with abnormal temperature needs to be judged as dirty or blocked, which is conducive to simplifying the electronic control program, reducing the amount of calculation, and thus improving sensitivity. During the non-charging and discharging process, each cold plate is judged as dirty or blocked to improve the comprehensiveness and accuracy of the prediction.

[0062] For example: when the battery device is not in the charge and discharge state, the flow rates qv and qvave of each cold plate are compared one by one, that is: qv11 is compared with qvave, and it is determined whether the comparison result meets the set dirty blockage condition. If so, it is determined that the first cold plate of the first cluster is dirty blocked; if not, it is determined that the first cold plate of the first cluster is not dirty blocked; qv12 is compared with qvave, and it is determined whether the comparison result meets the set dirty blockage condition. If so, it is determined that the second cold plate of the first cluster is dirty blocked; if not, it is determined that the second cold plate of the first cluster is not dirty blocked; ..., qvNn is compared with qvave, and it is determined whether the comparison result meets the set dirty blockage condition. If so, it is determined that the nth cold plate of the Nth cluster is dirty blocked; if not, it is determined that the nth cold plate of the Nth cluster is not dirty blocked.

[0063] When the battery device is in the charge and discharge state, it is first determined whether the system temperature difference meets the first set temperature condition. If so, the inlet and outlet temperature difference △T of each cold plate is determined, and according to the inlet and outlet temperature difference △T of each cold plate and the flow rate qv of each cold plate, it is determined whether each cold plate is dirty or blocked.

[0064] That is: compare △T11 with △Tave, and determine whether the comparison result meets the second set temperature condition. If not, it is determined that the first cold plate of the first cluster is not dirty or blocked. If so, compare qv11 with qvave, and determine whether the comparison result meets the set dirty or blocked condition. If so, it is determined that the first cold plate of the first cluster is dirty or blocked. If not, it is determined that the first cold plate of the first cluster is not dirty or blocked.

[0065] Compare △T12 with △Tave, and determine whether the comparison result meets the second set temperature condition. If not, it is determined that the second cold plate of the first cluster is not dirty and blocked. If so, compare qv12 with qvave, and determine whether the comparison result meets the set dirty and blocked condition. If so, it is determined that the second cold plate of the first cluster is dirty and blocked. If not, it is determined that the second cold plate of the first cluster is not dirty and blocked. …… Compare △TNn with △Tave, and determine whether the comparison result meets the second set temperature condition. If not, determine that the nth cold plate of the Nth cluster is not dirty or blocked. If so, compare qvNn with qvave, and determine whether the comparison result meets the set dirty or blocked condition. If so, determine that the nth cold plate of the Nth cluster is dirty or blocked. If not, determine that the nth cold plate of the Nth cluster is not dirty or blocked.

[0066] In some exemplary embodiments, Figure 3 As shown, according to the inlet and outlet temperature difference △T of each cold plate, judging whether each cold plate meets the second set temperature condition includes: According to the inlet and outlet temperature difference △T of each cold plate, calculate the average temperature difference △Tave; Compare the inlet and outlet temperature difference △T of each cold plate with the average temperature difference △Tave one by one; Based on the comparison result satisfying the second set temperature condition, determining that the corresponding cold plate satisfies the second set temperature condition; Based on the comparison result not satisfying the second set temperature condition, it is determined that the corresponding cold plate does not satisfy the second set temperature condition.

[0067] In actual use, generally only a small number of cold plates are blocked by dirt, and a large number of cold plates will not be blocked at the same time. Therefore, the average temperature difference △Tave can represent the average temperature difference of the normal cold plate at this time, that is, the normal temperature difference when the cold plate is not blocked by dirt. If the inlet and outlet temperature difference △T of a cold plate seriously deviates from the average temperature difference △Tave, it means that the temperature of the cold plate is abnormal, and it can be determined that the cold plate meets the second set temperature condition. Therefore, based on the comparison results of the temperature difference △T of each cold plate and the average temperature difference △Tave, it can be determined whether the temperature of each cold plate is abnormal.

[0068] In some exemplary embodiments, Figure 3 As shown, the second set temperature condition includes: |△T-△Tave| / △Tave≥εt, εt is the second set threshold, εt>0.

[0069] |△T-△Tave| can indicate the deviation of the temperature difference of the cold plate from the average temperature difference, and |△T-△Tave| / △Tave indicates the ratio of the deviation of the temperature difference of the cold plate from the average temperature difference to the average temperature difference, which can indicate the degree of deviation of the temperature difference of the cold plate from the normal temperature difference when no dirt blockage occurs. The greater the deviation, the greater the abnormality of the temperature difference of the cold plate (i.e., |△T-△Tave| / △Tave≥εt), and it can be determined that the second set temperature condition is met; the smaller the deviation (i.e., |△T-△Tave| / △Tave<εt), the smaller the abnormality of the temperature difference of the cold plate, and it can be determined that the second set temperature condition is not met.

[0070] Moreover, the size of εt is not restricted and can be reasonably set as needed. For example, εt can be in the range of (0, 1), such as 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, etc., or it can be in the range greater than 1.

[0071] In some embodiments, Figure 3 As shown, the second set temperature condition also includes: the duration of |△T-△Tave| / △Tave≥εt reaches a third set duration.

[0072] In other words, when the temperature difference of the cold plate is abnormal to a large extent and lasts for a certain period of time, it is determined that the second set temperature condition is met. This helps to avoid misjudgment of cold plate temperature abnormality due to accidental factors or other errors, and helps to improve the accuracy and reliability of cold plate temperature abnormality determination.

[0073] In some embodiments, 1min≤ts3≤10min, such as 1min, 2min, 3min, 4min, 5min, 6min, 7min, 8min, 9min, 10min, etc.

[0074] Of course, ts3 is not limited to the above range and can be adjusted as needed.

[0075] In some exemplary embodiments, Figure 3 As shown, judging whether a cold plate satisfying the second set temperature condition is dirty or blocked according to the flow rate qv of each cold plate includes: According to the flow rate qv of each cold plate, calculate the average flow rate qvave; The flow rate qv of the cold plate satisfying the second set temperature condition is compared with the average flow rate qvave; Based on the comparison result satisfying the set dirty blockage condition, determining that the cold plate satisfying the second set temperature condition is dirty blockage; Based on the comparison result not meeting the set dirty blockage condition, it is determined that the cold plate meeting the second set temperature condition is not dirty blockage and the process returns to the step of determining the inlet and outlet pressure difference ΔP of each cold plate.

[0076] As mentioned above, in actual use, generally only a small number of cold plates are dirty and blocked, and a large number of cold plates will not be dirty and blocked at the same time. Therefore, the average flow rate qvave can represent the average flow rate of the normal cold plate at this time, that is, the normal flow rate when the cold plate is not dirty and blocked. If the flow rate qv of the cold plate that meets the second set temperature condition seriously deviates from the average flow rate qvave, it indicates that the cold plate is abnormal, and it can be determined that the cold plate is dirty and blocked. Therefore, based on the comparison result of the flow rate qv of the cold plate that meets the second set temperature condition and the average flow rate qvave, it can be determined whether the cold plate that meets the second set temperature condition is dirty and blocked.

[0077] Among them, when the battery device is in a charging and discharging state, there is no order between the flow calculation step (including step S202, step S204 and the step of calculating the average flow rate qvave) and the temperature difference judgment step (including the step of determining the inlet and outlet temperature difference △T of each cold plate, calculating the average temperature difference and the step of comparing the inlet and outlet temperature difference △T of each cold plate with the average temperature difference), and they can be performed successively (the flow calculation step can be performed first and then the temperature difference judgment step, or the temperature difference judgment step can be performed first and then the flow calculation step), or they can be performed simultaneously.

[0078] In some embodiments, Figure 3 As shown, the dirty and blocked conditions are set to include: |qv-qvave| / qvave≥εp, where εp is the first set threshold.

[0079] |qv-qvave| can indicate the deviation of the flow rate of the cold plate from the average flow rate, and |qv-qvave| / qvave indicates the ratio of the deviation of the flow rate of the cold plate from the average flow rate to the average flow rate, which can indicate the degree of deviation of the flow rate of the cold plate from the normal flow rate when no dirty blockage occurs. The greater the deviation, the greater the flow abnormality of the cold plate (i.e., |qv-qvave| / qvave≥εp), and it can be determined that dirty blockage occurs; the smaller the deviation (i.e., |qv-qvave| / qvave<εp), the smaller the flow abnormality of the cold plate, and it can be determined that no dirty blockage occurs.

[0080] Moreover, the size of εp is not limited and can be reasonably set as needed, such as 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, etc.

[0081] In some embodiments, Figure 3 As shown, setting the dirty blockage condition also includes: the duration of |qv-qvave| / qvave≥εp reaches a first set duration ts1.

[0082] In other words, when the flow abnormality of the cold plate is relatively large and lasts for a certain period of time, it is determined that the cold plate is dirty and blocked. This helps to avoid misjudgment of cold plate blockage due to accidental factors or other errors, and helps to improve the accuracy and reliability of cold plate blockage judgment.

[0083] In some embodiments, 1min≤ts1≤10min, such as 1min, 2min, 3min, 4min, 5min, 6min, 7min, 8min, 9min, 10min, etc.

[0084] Of course, ts1 is not limited to the above range and can be adjusted as needed.

[0085] In some exemplary embodiments, Figure 3 As shown, before determining the inlet and outlet pressure difference △P of each cold plate and the cold plate dirty blockage determination method, the cold plate dirty blockage determination method also includes: Get sensor self-test results; Send out reminder information based on abnormal sensor self-test results; Based on the normal sensor self-test results and the normal status of each battery pack, a cold plate dirty blockage self-test instruction is received; In response to the cold plate dirty blockage self-check instruction, it is determined whether the battery device is in a charge and discharge state.

[0086] Based on the fact that the battery device is not in a charging or discharging state, the step of determining the inlet and outlet pressure difference ΔP of each cold plate is performed, and judging whether each cold plate is dirty or blocked according to the flow rate qv of each cold plate; Based on the battery device being in a charging and discharging state, first determining that the liquid temperature of the battery device meets a first set temperature condition; Based on the liquid temperature of the battery device satisfying the first set temperature condition, determining the inlet and outlet temperature difference △T of each cold plate, and judging whether each cold plate is dirty and blocked according to the inlet and outlet temperature difference △T of each cold plate and the flow rate qv of each cold plate; Based on the fact that the liquid temperature of the battery device does not satisfy the first set temperature condition, the process returns to the step of determining whether the battery device is in a charge and discharge state.

[0087] Before the cold plate dirty blockage self-check, the sensor self-check is first performed to avoid the subsequent misjudgment of cold plate dirty blockage due to sensor abnormality, thereby improving the accuracy and reliability of cold plate dirty blockage judgment. When the sensor self-check result is abnormal, a reminder message is issued to facilitate timely after-sales maintenance.

[0088] Among them, the sensor self-test results may include the pressure sensor self-test results and the temperature sensor self-test results to ensure the accuracy of the subsequent temperature difference and pressure difference. The sensor self-test can determine whether it is normal by detecting the resistance value of the sensor. The reminder information may include but is not limited to any one or more of sound signals, light signals, and picture signals.

[0089] The cold plate dirty blockage self-check instruction can be issued by the BMS (Battery Management System). The cell status can be judged whether the cell status is normal based on parameters such as voltage, current, and temperature. It can be judged whether the battery device is in the charging and discharging stage based on the protocol issued by the BMS.

[0090] In some exemplary embodiments, the plurality of battery packs are divided into N parallel battery clusters, a control valve assembly is provided on the pipeline, and the cold plate dirty blockage determination method further includes: The control valve assembly is controlled to operate so as to disconnect the flow path between the battery cluster where the cold plate blocked by dirt is located and the liquid cooling unit 10 .

[0091] When a cold plate is blocked by dirt, foreign matter in it can easily flow into the cold plates in the same cluster, causing other cold plates in the same cluster to also be blocked by dirt. Therefore, when a cold plate is determined to be blocked by dirt, the entire cluster of cold plates is disconnected and then cleaned and maintained for higher reliability.

[0092] In some exemplary embodiments, the control valve assembly is controlled to disconnect the flow path between the battery cluster where the dirty and blocked cold plate is located and the liquid cooling unit 10, including: closing the first liquid inlet valve 27 and the first liquid outlet valve 28 corresponding to the battery cluster where the dirty and blocked cold plate is located.

[0093] Compared with only providing the first liquid inlet valve 27 or the first liquid outlet valve 28, the present solution provides both the first liquid inlet valve 27 and the first liquid outlet valve 28 and closes them together, which is more conducive to preventing the liquid from flowing to other locations when there are impurities and foreign objects in the cluster, thereby causing dirt and blockage in other locations.

[0094] For example, when it is determined that the (i, k)th cold plate is blocked by dirt, the first liquid inlet valve 27 and the first liquid outlet valve 28 corresponding to the i-th battery cluster are both closed.

[0095] An embodiment of the present application also provides a control device, including a processor and a memory storing a computer program. When the processor executes the computer program, the steps of the cold plate dirty blockage determination method as described in any of the above embodiments are implemented, thereby having all the above-mentioned beneficial effects, which will not be repeated here.

[0096] The processor may be an integrated circuit chip with signal processing capabilities. The above-mentioned processor may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The disclosed methods, steps and logic block diagrams in the embodiments of the present invention may be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0097] The embodiment of the present application also provides an energy system, including a liquid cooling unit 10, a battery device and a control device as in the above embodiment, and thus has all the above-mentioned beneficial effects, which will not be repeated here.

[0098] The embodiment of the present application also provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the steps of the cold plate dirty blockage determination method as described in any of the above embodiments are implemented, thereby having all the above-mentioned beneficial effects, which will not be repeated here.

[0099] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0100] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0101] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0102] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0103] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0104] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

[0105] In any one or more of the above exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on a computer-readable medium or transmitted via a computer-readable medium as one or more instructions or codes, and executed by a hardware-based processing unit. A computer-readable medium may include a computer-readable storage medium corresponding to a tangible medium such as a data storage medium, or a communication medium that facilitates a computer program, such as any medium transmitted from one place to another according to a communication protocol. In this way, a computer-readable medium may generally correspond to a non-temporary tangible computer-readable storage medium or a communication medium such as a signal or carrier wave. A data storage medium may be any available medium that can be accessed by one or more computers or one or more processors to retrieve instructions, codes, and / or data structures for implementing the technology described in the present disclosure. A computer program product may include a computer-readable medium.

[0106] By way of example and not limitation, such computer-readable storage media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage devices, magnetic disk storage devices or other magnetic storage devices, flash memory or any other medium that can be used to store the desired program code in the form of instructions or data structures and can be accessed by a computer. Moreover, any connection may also be referred to as a computer-readable medium. For example, if instructions are transmitted from a website, server or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technologies such as infrared, radio and microwave, then coaxial cable, fiber optic cable, double-stripe line, DSL or wireless technologies such as infrared, radio and microwave are included in the definition of medium. However, it should be understood that computer-readable storage media and data storage media do not include connections, carriers, signals or other transient (transient) media, but are directed to non-transient tangible storage media. As used herein, disks and optical disks include compact disks (CDs), laser optical disks, optical optical disks, digital versatile disks (DVDs), floppy disks or Blu-ray disks, etc., where disks typically reproduce data magnetically, and optical disks use lasers to reproduce data optically. Combinations of the above should also be included within the scope of computer-readable media.

[0107] For example, instructions may be executed by one or more processors such as one or more digital signal processors (DSPs), general-purpose microprocessors, application-specific integrated circuits (ASICs), field programmable logic arrays (FPGAs), or other equivalent integrated or discrete logic circuits. Therefore, the term "processor" as used herein may refer to any of the above structures or any other structures suitable for implementing the techniques described herein. In addition, in some aspects, the functionality described herein may be provided in dedicated hardware and / or software modules configured for encoding and decoding, or incorporated in a combined codec. Furthermore, the techniques may be fully implemented in one or more circuits or logic elements.

[0108] The technical solutions of the embodiments of the present disclosure can be implemented in a wide variety of devices or equipment, including wireless mobile phones, integrated circuits (ICs) or a group of ICs (e.g., chipsets). Various components, modules or units are described in the embodiments of the present disclosure to emphasize the functional aspects of the devices configured to perform the described technologies, but they do not necessarily need to be implemented by different hardware units. Instead, as described above, the various units can be combined in a codec hardware unit or provided by a collection of interoperable hardware units (including one or more processors as described above) in combination with appropriate software and / or firmware.

Claims

1. A cold plate dirty blockage determination method, applied to energy storage system, characterized in that: The energy storage system comprises: a liquid cooling unit and a battery device, wherein the battery device comprises a plurality of battery packs connected in parallel, each of the battery packs is provided with a cold plate, and the plurality of cold plates are connected in parallel and communicated with the liquid cooling unit through pipelines; The cold plate dirty blockage determination method comprises: Determine the inlet and outlet pressure difference ΔP of each cold plate; Calculate the flow rate qv of each cold plate according to the inlet and outlet pressure difference ΔP of each cold plate and the flow rate coefficient calibration value Kv of the cold plate; Whether each of the cold plates is blocked by dirt is determined at least according to the flow rate qv of each of the cold plates.

2. The cold plate dirty blockage determination method according to claim 1 is characterized in that: The step of judging whether each cold plate is blocked by dirt at least according to the flow rate qv of each cold plate comprises: Based on the fact that the battery device is not in a charging or discharging state, judging whether each of the cold plates is dirty or blocked according to the flow rate qv of each of the cold plates; Based on the battery device being in a charging and discharging state, it is determined whether each of the cold plates is blocked by dirt according to the temperature of the liquid connecting the battery device and the liquid cooling unit and the flow rate qv of each of the cold plates.

3. The cold plate dirty blockage determination method according to claim 2 is characterized in that: The step of judging whether each cold plate is blocked by dirt according to the flow rate qv of each cold plate comprises: Calculate the average flow rate qvave according to the flow rates qv of each of the cold plates; Compare the flow rate qv of each cold plate with the average flow rate qvave one by one; Based on the comparison result satisfying the set dirty blocking condition, it is determined that the cold plate whose comparison result satisfies the set dirty blocking condition is dirty blocked.

4. The cold plate dirty blockage determination method according to claim 3 is characterized in that: The set dirty blockage condition includes: |qv-qvave| / qvave≥εp, where εp is a first set threshold, εp>0; The set dirty blockage condition also includes: the duration of |qv-qvave| / qvave≥εp reaches a first set duration ts1.

5. The cold plate dirty blockage determination method according to any one of claims 2 to 4, characterized in that: The determining whether each cold plate is blocked by dirt according to the temperature of the liquid connecting the battery device and the liquid cooling unit and the flow rate qv of each cold plate comprises: Based on the liquid temperature of the battery device satisfying the first set temperature condition, determining the inlet and outlet temperature difference ΔT of each cold plate; Whether dirt blockage occurs in each of the cold plates is determined based on the inlet and outlet temperature differences ΔT and the flow rates qv of each of the cold plates.

6. The cold plate dirty blockage determination method according to claim 5 is characterized in that: The pipeline includes a primary liquid inlet pipeline and a primary liquid outlet pipeline, wherein the primary liquid inlet pipeline is connected to the liquid outlet of the liquid cooling unit and is configured to supply liquid to the plurality of cold plates; the primary liquid outlet pipeline is connected to the liquid inlet of the liquid cooling unit and is configured to return the circulating liquid discharged from the plurality of cold plates to the liquid cooling unit; The liquid temperature of the battery device includes: the liquid inlet temperature Tin of the first-level liquid inlet pipeline, and the liquid outlet temperature Tout of the first-level liquid outlet pipeline; The first set temperature condition includes: Tout-Tin>△Ts, where △Ts is a set temperature threshold; The first set temperature condition also includes: the duration of Tout-Tin>ΔTs reaches a second set duration ts2.

7. The cold plate dirty blockage determination method according to claim 5, characterized in that: The step of judging whether each cold plate is blocked by dirt according to the inlet and outlet temperature difference ΔT of each cold plate and the flow rate qv of each cold plate comprises: According to the inlet and outlet temperature differences ΔT of each cold plate, determining whether each cold plate meets the second set temperature condition; Based on the fact that the cold plate meets the second set temperature condition, it is determined whether dirt and blockage occur in the cold plate that meets the second set temperature condition according to the flow rate qv of each of the cold plates.

8. The cold plate dirty blockage determination method according to claim 7 is characterized in that: The step of judging whether each of the cold plates meets the second set temperature condition according to the inlet and outlet temperature difference ΔT of each of the cold plates comprises: Calculate the average temperature difference △Tave according to the inlet and outlet temperature differences △T of each cold plate; Compare the inlet and outlet temperature differences ΔT of each cold plate with the average temperature difference ΔTave one by one; Based on the comparison result satisfying the second set temperature condition, it is determined that the corresponding cold plate satisfies the second set temperature condition.

9. The cold plate dirty blockage determination method according to claim 8, characterized in that: The second set temperature condition includes: |△T-△Tave| / △Tave≥εt, where εt is a second set threshold, εt>0; The second set temperature condition also includes: the duration of |ΔT-ΔTave| / ΔTave≥εt reaches a third set duration.

10. The cold plate dirty blockage determination method according to claim 7, characterized in that: The determining whether a cold plate satisfying the second set temperature condition is dirty or blocked according to the flow rate qv of each cold plate comprises: Calculate the average flow rate qvave according to the flow rates qv of each of the cold plates; Comparing the flow rate qv of the cold plate satisfying the second set temperature condition with the average flow rate qvave; Based on the comparison result satisfying the set dirty blockage condition, it is determined that the cold plate satisfying the second set temperature condition is dirty blockage.

11. The cold plate dirty blockage determination method according to any one of claims 2 to 4, characterized in that: After determining the inlet and outlet pressure difference ΔP of each cold plate, the cold plate dirty blockage determination method further includes: Get sensor self-test results; Based on the abnormality of the self-test result of the sensor, a reminder message is issued; Based on the self-test result of the sensor being normal and determining that each battery pack is in normal condition, a cold plate dirty blockage self-test instruction is received; In response to the cold plate dirt and blockage self-check instruction, it is determined whether the battery device is in a charge and discharge state.

12. The cold plate dirty blockage determination method according to any one of claims 1 to 4, characterized in that: The plurality of battery packs are divided into N parallel battery clusters, a control valve assembly is provided on the pipeline, and the cold plate dirty blockage determination method further includes: The control valve assembly is controlled to operate so as to disconnect the flow path between the battery cluster where the cold plate blocked by dirt is located and the liquid cooling unit.

13. The cold plate dirty blockage determination method according to claim 12, characterized in that: The pipeline includes a first-level liquid inlet pipeline and a first-level liquid outlet pipeline, the first-level liquid inlet pipeline is connected to the liquid outlet of the liquid cooling unit, the first-level liquid outlet pipeline is connected to the liquid inlet of the liquid cooling unit, the control valve assembly includes N first liquid inlet valves and N first liquid outlet valves, the first liquid inlet valve is provided between the first-level liquid inlet pipeline and each cluster of the cold plates, and the first liquid outlet valve is provided between the first-level liquid outlet pipeline and each cluster of the cold plates; The controlling the control valve assembly to disconnect the flow path between the battery cluster where the dirty and blocked cold plate is located and the liquid cooling unit includes: closing the first liquid inlet valve and the first liquid outlet valve corresponding to the battery cluster where the dirty and blocked cold plate is located.

14. A control device, characterized in that: The method comprises a processor and a memory storing a computer program, wherein when the processor executes the computer program, the steps of the cold plate dirty blockage determination method as claimed in any one of claims 1 to 13 are implemented.

15. An energy storage system, characterized in that: It comprises a liquid cooling unit, a battery device and a control device as claimed in claim 14.

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