Heat management system of energy storage container

Abstract

The utility model provides a thermal management system for an energy storage container, which belongs to the technical field of thermal management, and comprises n battery clusters, each battery cluster comprises m battery packs, the n battery clusters are grouped to form k battery cluster groups, and n, m and k are respectively positive integers greater than 1; the liquid cooling unit comprises a plurality of pairs of water outlets and water return ports, each battery cluster group corresponds to one pair of water outlets and water return ports, and the water outlets and water return ports of the liquid cooling unit are respectively connected with the battery cluster groups through k independent first liquid cooling pipelines; the sensing modules are respectively arranged in the battery cluster group and at a water outlet and a water return port of the liquid cooling unit; and the thermal management module is respectively connected with the sensing module and the liquid cooling unit. The method has the beneficial effects that the battery clusters are subjected to grouping management, a grouping type liquid supply mode is adopted, the redundant process that cooling liquid flows through all the battery clusters is avoided, the accuracy of the return water temperature is improved, and the return water temperature can serve as a backup judgment condition of temperature abnormity; the liquid cooling control of each group can be adjusted according to real-time working conditions, and the operation power consumption of the system is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of heat management, especially relates to a thermal management system of energy storage container. BACKGROUND

[0002] With the development of the energy storage industry, liquid-cooled energy storage systems are moving towards higher energy density and greater intelligence. In this trend, the energy storage container heat management method also needs to keep pace with the times.

[0003] Currently, the traditional energy storage container heat management has the following problems:

[0004] First, the energy storage container usually adjusts the outlet water temperature according to the sampling temperature of the battery pack to make the battery run in the best temperature range. Since the sampling temperature is affected by various factors and may deviate, relying only on the sampling temperature of the battery pack for monitoring may not be able to detect and handle problems in time, resulting in limited response speed and accuracy of the system to temperature abnormalities.

[0005] Secondly, the energy storage container usually uses an integrated liquid supply method, and the liquid cooling unit only has one outlet and one return. After the cooling liquid flows out of the outlet of the liquid cooling unit, it needs to pass through a long first and second liquid supply pipeline to reach each battery cluster for cooling, and then pass through a first and second return pipeline to return to the return of the liquid cooling unit. If a single battery cluster has a temperature anomaly, the accuracy of the return temperature will be greatly affected due to the long distance flow and the influence of multiple battery clusters, which makes the return temperature unable to be used as a backup judgment condition for temperature abnormalities.

[0006] In addition, with the development of energy storage containers towards AC / DC integration, in AC / DC integrated energy storage containers, battery clusters can be operated individually or in combination according to actual working conditions. When one or more battery clusters in the system are in a stopped running, maintenance or fault state, and other battery clusters are running normally, the liquid cooling unit still needs to work all the time to cool all the battery clusters, which increases the system operating power consumption and cannot adjust the outlet water temperature according to real-time working conditions.

[0007] Finally, the traditional heat management only controls the temperature of the liquid-cooled battery pack, ignoring the heat management of the high-voltage box inside the battery pack. When the high-voltage box has a temperature that is too high or too low during operation, it will affect the performance and life of the battery pack. UTILITY MODEL CONTENTS

[0008] To solve the above technical problems, the utility model provides a thermal management system of energy storage container.

[0009] The technical problem solved by the utility model can be realized by the following technical solutions:

[0010] An energy storage container thermal management system, comprising:

[0011] n battery clusters, each of the battery clusters comprising m battery packs, n battery clusters are grouped to form k battery cluster groups, n, m and k are positive integers greater than 1;

[0012] a liquid cooling unit, the liquid cooling unit comprising multiple pairs of water outlet and return ports, each of the battery cluster groups corresponding to a pair of the water outlet and return ports, the water outlet and return ports of the liquid cooling unit being connected to each of the battery cluster groups through k independent first liquid cooling pipelines;

[0013] a sensing module, respectively arranged in each of the battery cluster groups and at the water outlet and return ports of the liquid cooling unit;

[0014] a thermal management module, respectively connected to the sensing module and the liquid cooling unit.

[0015] Preferably, each of the first liquid cooling pipelines comprises a water inlet pipeline and a water return pipeline;

[0016] The water inlet pipeline comprises a first-level water inlet pipeline, a second-level water inlet pipeline and a third-level water inlet pipeline, the first-level water inlet pipeline having a first shunt port with the same number of battery clusters as each of the battery cluster groups, the second-level water inlet pipeline having a second shunt port with the same number of battery packs as each of the battery clusters of the battery cluster groups;

[0017] The water return pipeline comprises a first-level water return pipeline, a second-level water return pipeline and a third-level water return pipeline, the first-level water return pipeline having a first confluence port with the same number of battery clusters as each of the battery cluster groups, the second-level water return pipeline having a second confluence port with the same number of battery packs as each of the battery clusters of the battery cluster groups.

[0018] Preferably, the water outlet of the liquid cooling unit is connected to the first-level water inlet pipeline, the second-level water inlet pipeline is connected to the first shunt port, one end of the third-level water inlet pipeline is connected to the second shunt port, and the other end of the third-level water inlet pipeline is connected to one side of a liquid cooling plate of the battery pack corresponding to the battery cluster group;

[0019] The other side of the liquid cooling plate of the battery pack corresponding to the battery cluster group is connected to one end of the third-level water return pipeline, the other end of the third-level water return pipeline is connected to the second confluence port, the second-level water return pipeline is connected to the first confluence port, and the first-level water return pipeline is connected to the water return port of the liquid cooling unit.

[0020] Preferably, each of the battery packs is respectively provided with a battery management unit;

[0021] Each of the battery clusters is respectively provided with a battery cluster management unit, and the battery cluster management unit is respectively connected to the battery management unit corresponding to each of the battery packs in the battery cluster.

[0022] Preferably, each of the battery packs is further provided with a high-pressure tank;

[0023] Further comprising:

[0024] A second liquid cooling pipeline, through which the outlet water inlets of the liquid cooling unit are connected to the high-pressure tanks in each of the battery packs of all the battery cluster groups.

[0025] Preferably, the sensing module comprises:

[0026] A battery pack temperature monitoring component arranged in each of the battery packs.

[0027] Preferably, the sensing module further comprises:

[0028] An outlet water temperature monitoring component arranged at each of the outlet water inlets of the liquid cooling unit;

[0029] A return water temperature monitoring component arranged at each of the return water inlets of the liquid cooling unit.

[0030] Preferably, the thermal management module comprises:

[0031] A battery management system connected to the battery cluster management units of each of the battery clusters;

[0032] An energy management system connected to the battery management system and the liquid cooling unit.

[0033] Preferably, the liquid cooling unit further comprises an electronic expansion valve arranged at the outlet water inlets of the liquid cooling unit.

[0034] Preferably, each of the battery clusters is provided with an energy storage converter connected to the battery packs.

[0035] The advantages or beneficial effects of the technical scheme of the utility model lie in:

[0036] The utility model groups and manages the battery clusters in the energy storage container, adopts a grouping type liquid supply mode, directly cools and manages each group of battery clusters independently, avoids the redundant process of cooling liquid flowing through all the battery clusters, improves the accuracy of the return water temperature, and makes it possible to serve as a backup judgment condition for temperature abnormalities; in addition, the system can intelligently adjust the liquid cooling control of a single or multiple battery cluster groups according to the real-time working conditions of the battery clusters, and reduces the system operation power consumption. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 For the preferred embodiment of the utility model, the electrical schematic diagram of the energy storage container thermal management system;

[0038] Figure 2 For the preferred embodiment of the present application, the electrical schematic diagram of the energy storage container thermal management system.

[0039] Reference signs:

[0040] 1, battery cluster group; 11, battery cluster; 12, battery pack; 2, liquid cooling unit; 21, water outlet; 22, water return; 23, control panel; 31, first-stage water inlet pipeline; 32, second-stage water inlet pipeline; 33, third-stage water inlet pipeline; 34, third-stage water return pipeline; 35, second-stage water return pipeline; 36, first-stage water return pipeline; 4, battery management unit; 5, battery cluster management unit; 6, liquid cooling plate; 7, high-voltage box. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0042] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0043] Most of the liquid cooling units 2 on the market supply cooling liquid to the energy storage battery cluster 11 through one or at most two paths, which is more friendly to the container on the pure direct current side. However, the energy storage is developing in the direction of higher safety, higher reliability, higher system efficiency, higher energy density and higher integration, which results in a large-capacity, AC / DC integrated liquid-cooled energy storage container. In order to solve the problems of large energy consumption and low precision of water return temperature of the liquid cooling unit 2, the present application provides an energy storage container thermal management system, which adopts a multi-branch control mode to realize more precise temperature control, increase the service life of the energy storage system, reduce the probability of thermal runaway, and reduce system loss.

[0044] The present application will be further described below in combination with the drawings and specific embodiments, but not as a limitation of the present application.

[0045] Referring to Figure 1 and Figure 2 , in the preferred embodiment of the present application, based on the above problems existing in the prior art, the present application provides an energy storage container thermal management system, comprising:

[0046] n battery clusters 11, each battery cluster 11 comprising m battery packs 12, n battery clusters 11 being grouped to form k battery cluster groups 1, n, m and k being positive integers greater than 1.

[0047] The liquid cooling unit 2 includes multiple pairs of outlet and return water ports 22, each battery cluster group 1 corresponding to a pair of outlet and return water ports 22, and the outlet and return water ports 22 of the liquid cooling unit 2 are connected to each battery cluster group 1 through k independent first liquid cooling pipelines;

[0048] A sensing module (not shown in the figure) is arranged in each battery cluster group 1 and at the outlet and return water ports 22 of the liquid cooling unit 2;

[0049] A thermal management module (not shown in the figure) is connected to the sensing module and the liquid cooling unit 2.

[0050] Specifically, the traditional liquid cooling unit 2 has certain functional limitations for both existing conventional energy storage containers and AC-DC integrated energy storage containers. In this embodiment, the battery clusters 11 inside the energy storage container are grouped and managed, and a grouped liquid supply mode is adopted to independently cool and manage each group of battery clusters 11, avoiding the redundant process of cooling liquid flowing through all battery clusters 11, improving the accuracy of return water temperature, and making it a backup judgment condition for temperature abnormalities.

[0051] In addition, especially for AC-DC integrated energy storage containers, the battery clusters 11 inside the container can operate independently, and single cluster or multiple cluster operation is controlled according to different working conditions, and other battery clusters 11 stop operating. Compared with the traditional integrated liquid supply mode, the grouped liquid supply mode in this embodiment can intelligently adjust the liquid cooling control of single or multiple battery cluster groups 1 according to the real-time working conditions of each battery cluster group 1, reducing system operating power consumption.

[0052] As a preferred embodiment, each liquid cooling pipeline includes an inlet pipeline and a return pipeline to form a complete cooling liquid circulation path;

[0053] The inlet pipeline includes a first-stage inlet pipeline 31, a second-stage inlet pipeline 32, and a third-stage inlet pipeline 33.

[0054] The return pipeline includes a first-stage return pipeline 36, a second-stage return pipeline 35, and a third-stage return pipeline 34.

[0055] Specifically, the inlet pipeline is divided into a first-stage inlet pipeline 31, a second-stage inlet pipeline 32, and a third-stage inlet pipeline 33.

[0056] The first-stage inlet pipeline 31 is responsible for distributing cooling liquid to each battery cluster group 1.

[0057] The second-stage inlet pipeline 32 is responsible for distributing cooling liquid from the first-stage inlet pipeline 31 to the battery clusters 11 inside each battery cluster group 1.

[0058] The tertiary water-in pipe 33 is responsible for transporting the coolant from the secondary water-in pipe 32 directly to the liquid cooling plate 6 of the battery pack 12 in the battery cluster 11.

[0059] The water-out pipe is also divided into a primary water-out pipe 36, a secondary water-out pipe 35 and a tertiary water-out pipe 34.

[0060] The primary water-out pipe 36 is responsible for collecting the coolant of the single battery cluster group 1.

[0061] The secondary water-out pipe 35 is responsible for collecting the coolant from the battery cluster 11 to the primary water-out pipe 36.

[0062] The tertiary water-out pipe 34 is responsible for transporting the coolant of the battery pack 12 to the secondary water-out pipe 35.

[0063] As a preferred embodiment, the primary water-in pipe 31 has the same number of first shunt ports as the number of battery clusters 11 in each battery cluster group 1, and the secondary water-in pipe 32 has the same number of second shunt ports as the number of battery packs 12 in each battery cluster 11 of the battery cluster group 1.

[0064] Specifically, the primary water-in pipe 31 is provided with a plurality of first shunt ports for uniformly distributing the coolant to each battery cluster 11 in the battery cluster group 1, and the number of first shunt ports is determined according to the number of battery clusters 11 in the battery cluster group 1.

[0065] The secondary water-in pipe 32 is provided with a plurality of second shunt ports for distributing the coolant from the primary water-in pipe 31 to the battery pack 12 in the battery cluster 11, and the number of second shunt ports is determined according to the number of battery packs 12 in the battery cluster 11.

[0066] As a preferred embodiment, the primary water-out pipe 36 has the same number of first shunt ports as the number of battery clusters 11 in each battery cluster group 1, and the secondary water-out pipe 35 has the same number of second shunt ports as the number of battery packs 12 in each battery cluster 11 of the battery cluster group 1.

[0067] Specifically, the primary water-out pipe 36 is provided with a plurality of first shunt ports for collecting the coolant from each battery cluster 11 in the battery cluster group 1 to the primary water-out pipe 36.

[0068] The number of first shunt ports is the same as the number of first shunt ports, which can be determined according to the number of battery clusters 11 in the battery cluster group 1.

[0069] The secondary water-out pipe 35 is provided with a plurality of second shunt ports for collecting the coolant from the battery pack 12 in the battery cluster 11 to the secondary water-out pipe 35.

[0070] The number of second shunt ports is the same as the number of second shunt ports, which can be determined according to the number of battery packs 12 in the battery cluster 11.

[0071] The number of battery clusters 11 in different battery cluster groups 1 can be the same or different. The number of battery packs 12 in different battery clusters 11 in the same battery cluster group 1 can also be the same or different.

[0072] As a preferred embodiment, the water outlet 21 of the liquid cooling unit 2 is connected to the first water inlet pipeline 31, the second water inlet pipeline 32 is connected to the first shunt port, one end of the third water inlet pipeline 33 is connected to the second shunt port, and the other end of the third water inlet pipeline 33 is connected to one side of the liquid cooling plate 6 of the battery pack 12 corresponding to the battery cluster group 1.

[0073] The other end of the third water inlet pipeline 33 is connected to the second shunt port, the second water inlet pipeline 32 is connected to the first shunt port, one end of the third water inlet pipeline 33 is connected to the second shunt port, and the other end of the third water inlet pipeline 33 is connected to one side of the liquid cooling plate 6 of the battery pack 12 corresponding to the battery cluster group 1.

[0074] Specifically, the plurality of battery clusters 11 are divided into a plurality of groups, and for each battery cluster group 1, the cooling liquid circulation path is divided into a liquid supply path and a return flow path.

[0075] The liquid supply path is: the cooling liquid from the water outlet 21 of the liquid cooling unit 2, sequentially passes through the first water inlet pipeline 31, the first shunt port, the second water inlet pipeline 32, the second shunt port, the third water inlet pipeline 33, and finally enters the liquid cooling plate 6 of the battery pack 12 for heat exchange.

[0076] The return flow path is: the cooling liquid after completing heat exchange in the liquid cooling plate 6 of the battery pack 12, sequentially passes through the third water return pipeline 34, the second shunt port, the second water return pipeline 35, the first shunt port, the first water return pipeline 36, and returns to the water return port 22 of the liquid cooling unit 2 to complete the entire circulation.

[0077] Compared with the traditional integrated liquid supply mode, the embodiment of the utility model greatly shortens the cooling liquid circulation path length of a single battery cluster group 1 by adopting the grouping liquid supply mode, and can realize accurate temperature control. At the same time, it can avoid the interference on the overall return water temperature caused by the abnormal working condition of individual battery clusters 11 to a certain extent, and further improve the monitoring accuracy of the return water temperature.

[0078] As a preferred embodiment, each battery pack 12 is respectively provided with a battery management unit 4 (Battery Management Unit, BMU);

[0079] Each battery cluster 11 is provided with a battery cluster management unit 5 (Battery Cluster Unit or Battery Cluster Management Unit, BCU) respectively, which is connected to the corresponding battery management unit 4 of each battery pack 12 in the battery cluster 11.

[0080] Specifically, the main function of the BMU is to collect information such as battery cell voltage and temperature, perform active balancing management, and manage the heat in the battery pack 12.

[0081] The BCU is responsible for voltage collection, current collection, and the collection of single battery voltage and temperature information in the cluster, calculation of battery cluster 11 SOC / SOH status, execution of balancing strategy judgment and battery fault diagnosis function, implementation of on-site protection and relay control of the battery cluster 11 according to battery fault information, insulation collection function, and single battery SOC / SOH status calculation function.

[0082] The battery cluster management unit 5 (BCU) and the battery management unit 4 (BMU) communicate using a CAN communication interface.

[0083] As a preferred embodiment, the thermal management module includes:

[0084] A battery management system (BMS) is connected to the battery cluster management unit 5 of each battery cluster 11.

[0085] An energy management system (EMS) is connected to the battery management system and the liquid cooling unit 2.

[0086] Specifically, the BMS is a system for monitoring and controlling the battery cluster 11, responsible for monitoring battery status, temperature, voltage, current, and other parameters, and controlling the battery charging and discharging process according to these information to ensure safe operation and extend the service life of the battery. The BMS can also manage the charging and discharging rate of the battery, ensure the safe operation of the battery within a safe range, and provide fault diagnosis and protection functions.

[0087] The EMS is a system for energy management, mainly involving the monitoring, control and optimization of the entire energy system. EMS can integrate multiple energy sources (such as power grid, solar energy, wind energy, etc.), and optimize the distribution and use of energy according to demand and energy supply. EMS can monitor the production, consumption and efficiency of energy, and coordinate the use of various energy sources to achieve energy saving and optimization.

[0088] The liquid cooling unit 2 uses a standardized communication protocol to communicate with the BMS system or the EMS system, ensuring that the BMS system can quickly send the battery cell temperature signals of the battery pack 12 monitored to the liquid cooling unit 2. The liquid cooling unit 2 can automatically respond to relevant strategies according to the instruction information issued by the BMS system or the EMS system and the outlet water temperature and return water temperature detected by itself.

[0089] As a preferred embodiment, each battery pack 12 is further provided with a high-voltage box 7 respectively;

[0090] Further comprising:

[0091] The second liquid cooling pipeline connects the outlet and return water ports 22 of the liquid cooling unit 2 with the high-voltage boxes 7 in each battery pack 12 of all battery cluster groups 1 respectively.

[0092] Specifically, for the traditional thermal management, only the temperature control of the liquid-cooled battery pack 12 is performed, and the high-voltage box 7 inside the battery pack 12 is ignored. In this embodiment, by providing a second liquid cooling pipeline, when the temperature of the high-voltage box 7 is too high or too low during operation, the second liquid cooling pipeline is used to supply liquid separately to control the temperature of the high-voltage box 7, thereby prolonging the service life of the battery pack 12 and improving the performance of the battery pack 12.

[0093] Further, the second liquid cooling pipeline is similar to the first liquid cooling pipeline described above and is also divided into an inlet pipeline and a return pipeline. Similarly, the inlet pipeline is also divided into a first-level inlet pipeline 31, a second-level inlet pipeline 32, and a third-level inlet pipeline 33, and the return pipeline is divided into a first-level return pipeline 36, a second-level return pipeline 35, and a third-level return pipeline 34. The setting mode is similar, and the only difference is that the third-level inlet pipeline 33 and the third-level return pipeline 34 are connected to the high-voltage boxes 7 in each battery pack 12, which will not be described here.

[0094] Specifically, the inlet pipeline is divided into a first-level inlet pipeline 31, a second-level inlet pipeline 32, and a third-level inlet pipeline 33.

[0095] The first-level inlet pipeline 31 is responsible for distributing the cooling liquid to each battery cluster group 1.

[0096] The second-level inlet pipeline 32 is responsible for distributing the cooling liquid from the first-level inlet pipeline 31 to the battery cluster 11 in each battery cluster group 1.

[0097] The third-level inlet pipeline 33 is responsible for directly delivering the cooling liquid from the second-level inlet pipeline 32 to the liquid cooling plate 6 of the battery pack 12 in the battery cluster 11.

[0098] The return pipeline is also divided into a first-level return pipeline 36, a second-level return pipeline 35, and a third-level return pipeline 34.

[0099] The first return water pipeline 36 is responsible for collecting the coolant of the single battery cluster group 1.

[0100] The second return water pipeline 35 is responsible for collecting the coolant from the battery cluster 11 to the first return water pipeline 36.

[0101] The third return water pipeline 34 is responsible for delivering the coolant of the battery pack 12 to the second return water pipeline 35.

[0102] The heat management system of the embodiment of the utility model utilizes the liquid cooling unit 2, adopts multiple separate liquid supply branches, can perform heat management control on the battery cluster 11 and PCS AC / DC integrated machine in the container, and reduces system loss. Since the battery cluster 11 is supplied with liquid in the container, the redundant process of the coolant flowing through all the battery clusters 11 is avoided, in the process of controlling the temperature of the liquid cooling unit 2, the coolant can quickly return to the liquid cooling unit 2, the monitoring accuracy of the return water temperature of the coolant is improved, it can be used as a backup judgment condition for temperature anomaly, and the cell environment temperature can be accurately controlled, so that the cell can be operated in the best temperature range.

[0103] As an example but not limitation, as shown in Figure 2 For the existing energy storage container containing 10 battery clusters 11, the utility model groups the 10 battery clusters 11 according to the mode of "3322", that is, 3 clusters, 3 clusters, 2 clusters and 2 clusters, the liquid cooling unit 2 can adopt five-way pipeline control, that is, four first liquid cooling pipelines for each battery cluster group (3 clusters, 3 clusters, 2 clusters and 2 clusters) and one second liquid cooling pipeline for the high-voltage box 7 (containing PCS AC / DC integrated machine), to realize accurate temperature control management, but not limited to this scheme.

[0104] In actual application, the pipeline layout and the coolant circulation mode of the liquid cooling system can be flexibly designed according to the specific layout of the energy storage container and the arrangement mode of the battery cluster 11.

[0105] Further, the liquid cooling unit 2 can select any one of the following operation modes: refrigeration start mode, self-circulation mode and heating start mode.

[0106] As a preferred embodiment, the sensing module comprises:

[0107] The battery pack 12 temperature monitoring component is arranged in each battery pack 12.

[0108] Specifically, the battery pack 12 temperature monitoring component is arranged in each battery pack 12 for monitoring the battery pack 12 temperature of the single battery pack 12.

[0109] The battery pack 12 temperature monitoring component is electrically connected with the BMS system, the BMS system is used for continuously collecting the battery pack 12 temperature from all battery packs 12 in the energy storage box, realizing updating the battery state, and uploading the highest battery temperature, the lowest battery temperature and the average temperature to the EMS system.

[0110] The EMS system is used for analyzing the battery pack 12 temperature data uploaded by the BMS system and the outlet water temperature and return water temperature data of the liquid cooling unit 2, and the following instructions are sent to the liquid cooling unit 2, the liquid cooling unit 2 controls the outlet water temperature of each branch cooling liquid according to the instructions sent by the EMS system and the self logic and outputs.

[0111] In the refrigeration starting mode, if the highest battery temperature T max does not exceed the preset upper temperature limit value T th1 , or the average temperature T avg does not exceed the first preset temperature threshold T th2 , that is, T max ≤ T th1 , or T avg ≤ T th2 , the liquid cooling unit 2 is controlled to stop refrigeration.

[0112] In the heating starting mode, if the lowest battery temperature T min is not lower than the preset lower temperature limit value T th3 , or the average temperature T avg is not lower than the second preset temperature threshold T th4 , that is, T min ≥ T th3 , or T avg ≥ T th4 , the liquid cooling unit 2 is controlled to stop heating.

[0113] Among them, the preset upper temperature limit value T th1 , the first preset temperature threshold T th2 , the preset lower temperature limit value T th3 and the second preset temperature threshold T th4 may be set to specific values in actual application, for example, T th1 = 28℃, T th2 = 25℃, T th3 = 20℃, T th4 = 22℃, and the utility model is not limited to this.

[0114] As a preferred embodiment, wherein the sensing module further comprises:

[0115] The outlet water temperature monitoring component is arranged at each outlet 21 of the liquid cooling unit 2;

[0116] The return water temperature monitoring component is arranged at each return port 22 of the liquid cooling unit 2.

[0117] Specifically, in view of the fact that the BMS system may detect abnormities in the existing high-integration module, in the embodiment, temperature monitoring components are arranged at the water outlet 21 and the return water outlet 22 of the liquid cooling unit 2, which are used to monitor the outlet water temperature and the return water temperature during the energy storage operation, so as to take the return water temperature as a backup determination condition for system temperature abnormities.

[0118] In the embodiment of the utility model, the battery clusters 11 are grouped and controlled respectively. The influence of the battery cluster group 1 in the non-operation state on the whole system can be ignored. Since the length of the pipeline of a single branch is short, the temperature control of the battery cluster 11 is more convenient, which can reduce the start-up frequency of the refrigeration or heating working condition to a certain extent and shorten the time required for these working conditions.

[0119] Further, in the refrigeration start mode, if the absolute difference between the return water temperature T 回水 and the outlet water temperature T 出水 is not less than a preset temperature difference T th5 , that is, |T 回水 -T 出水 |≥T th5 , an alarm signal is output to the system background.

[0120] The preset temperature difference T th5 may be set to a specific value in actual application, for example, T th5 = 2℃, which is not limited in the utility model.

[0121] As a preferred embodiment, the liquid cooling unit 2 further comprises an electronic expansion valve, which is arranged at the water outlet 21 of the liquid cooling unit 2.

[0122] Specifically, in view of the fact that one electronic control flow valve is arranged on the pipeline of each battery cluster 11 or each battery pack 12 in the prior art, which may increase the failure points of the system and is not easy to maintain and replace, in the embodiment, only one electronic expansion valve is arranged at each water outlet 21. Specifically, the electronic expansion valve can be built-in at the water outlet 21 part of the liquid cooling unit 2 or externally mounted at the water outlet 21 outside the liquid cooling unit 2.

[0123] The electronic expansion valve can control the supply of the cooling liquid in the pipeline of each battery cluster group 1. By adjusting the valve opening of the electronic expansion valve, the flow size of the cooling liquid can also be controlled.

[0124] When the electronic expansion valve is in the open state, the corresponding liquid cooling pipeline can provide cooling liquid for the corresponding battery cluster group 1; when the electronic expansion valve is closed, the corresponding liquid cooling pipeline stops supplying liquid.

[0125] Further, the liquid cooling unit 2 further comprises a control board 23 connected with a battery management system (BMS) and an energy management system (EMS), which is used to control the opening and closing of the electronic expansion valve of the corresponding branch according to the real-time working condition of each battery cluster group 1.

[0126] Specifically, when a certain battery cluster group 1 is running, the control board 23 will instruct the corresponding electronic expansion valve to open, and supply the battery pack 12 of the battery cluster group 1 with cooling liquid through the pipeline, so as to realize liquid cooling control.

[0127] When a certain battery cluster group 1 is in a non-working state, the control board 23 will command the corresponding electronic expansion valve to close, so as to optimize energy utilization and maintain stable operation of the system.

[0128] Further, the liquid cooling unit 2 can further be provided with a circulating water pump, a compressor, a heat exchanger and a fan, etc. The circulating water pump is used to transport the cooling liquid and provide power for the cooling liquid circulation system; the compressor is used to compress the refrigerant and provide power for the refrigeration system; the heat exchanger is located at the intersection of the refrigeration cycle system and the cooling liquid circulation system, and is responsible for heat exchange between the refrigerant and the cooling liquid; and the fan is used to discharge the heat released by the refrigerant in the condenser to the outdoor.

[0129] As a preferred embodiment, a power conversion system (PCS) is arranged in each battery cluster 11, and the PCS is connected with the battery pack 12.

[0130] Specifically, the existing containers generally directly output direct current and cannot provide alternating current, but in the embodiment, the PCS is integrated in the battery cluster 11, so that the battery can be controlled in the charging and discharging process, the AC / DC conversion is performed, and the AC load can be directly powered in the case of no power grid access.

[0131] Further, the PCS is integrated into the high-voltage box 7 in the embodiment, and such a layout is not only compact and efficient, but also can control the temperature of the PCS in the high-voltage box 7 when the temperature of the high-voltage box 7 is controlled through the second liquid cooling pipeline.

[0132] The advantages or beneficial effects of the above technical scheme are as follows: the battery cluster 11 in the energy storage container is managed in groups, the grouping type liquid supply mode is adopted, each group of battery clusters 11 is directly and independently cooled and thermally managed, the redundant process of the cooling liquid flowing through all the battery clusters 11 is avoided, the accuracy of the return water temperature is improved, the return water temperature can be used as a backup judgment condition for temperature abnormalities, and in addition, the system can intelligently adjust the liquid cooling control of a single or multiple battery cluster groups 1 according to the real-time working condition of the battery cluster 11, and the system operation power consumption is reduced.

[0133] The thermal management system can significantly enhance the safety and reliability of the system, reduce the energy consumption of the system, and maximize the utilization of energy.

[0134] The above is only the preferred embodiment of the utility model, and does not limit the implementation and protection scope of the utility model, and for those skilled in the art, it should be realized that the scheme obtained by equivalent replacement and obvious change of the specification and drawing can be included in the protection scope of the utility model.

Claims

1. An energy storage container thermal management system, characterized by, The application relates to a battery pack and a liquid cooling system thereof. The battery pack comprises: n battery clusters, each of which comprises m battery packs, and n battery clusters form k battery cluster groups, wherein n, m and k are positive integers greater than 1; a liquid cooling unit, which comprises multiple pairs of water outlet and return ports, each of which corresponds to one of the battery cluster groups, and the water outlet and return ports of the liquid cooling unit are connected to the battery cluster groups through k independent first liquid cooling pipelines; a sensing module arranged in the battery cluster groups and at the water outlet and return ports of the liquid cooling unit; 2. The energy storage container thermal management system of claim 1, wherein, a thermal management module connected to the sensing module and the liquid cooling unit. Each of the first liquid cooling pipelines comprises a water inlet pipeline and a water return pipeline. The water inlet pipeline comprises a first-level water inlet pipeline, a second-level water inlet pipeline and a third-level water inlet pipeline, the first-level water inlet pipeline has the same number of first branch ports as the number of battery clusters in each of the battery cluster groups, and the second-level water inlet pipeline has the same number of second branch ports as the number of battery packs in each of the battery clusters of the battery cluster groups.

3. The energy storage container thermal management system of claim 2, wherein, The water return pipeline comprises a first-level water return pipeline, a second-level water return pipeline and a third-level water return pipeline, the first-level water return pipeline has the same number of first combination ports as the number of battery clusters in each of the battery cluster groups, and the second-level water return pipeline has the same number of second combination ports as the number of battery packs in each of the battery clusters of the battery cluster groups. The water outlet of the liquid cooling unit is connected to the first-level water inlet pipeline, the second-level water inlet pipeline is connected to the first branch ports, one end of the third-level water inlet pipeline is connected to the second branch ports, and the other end of the third-level water inlet pipeline is connected to one side of a liquid cooling plate of the battery pack corresponding to the battery cluster group.

4. The energy storage container thermal management system of claim 1, wherein, One end of the third-level water return pipeline is connected to the other side of the liquid cooling plate of the battery pack corresponding to the battery cluster group, the other end of the third-level water return pipeline is connected to the second combination ports, the second-level water return pipeline is connected to the first combination ports, and the first-level water return pipeline is connected to the water return ports of the liquid cooling unit. Each of the battery packs is provided with a battery management unit.

5. The energy storage container thermal management system of claim 1, wherein, Each of the battery clusters is provided with a battery cluster management unit, and the battery cluster management unit is connected to the battery management units of the battery packs in the battery cluster. Each of the battery packs is further provided with a high-voltage box. The application further relates to a liquid cooling system of the battery pack.

6. The energy storage container thermal management system of claim 1, wherein, The sensing module comprises: a battery pack temperature monitoring component arranged in each of the battery packs.

7. The energy storage container thermal management system of claim 1, wherein, The sensing module further comprises: a water outlet temperature monitoring component arranged at each of the water outlets of the liquid cooling unit; a water return temperature monitoring component arranged at each of the water return ports of the liquid cooling unit.

8. The energy storage container thermal management system of claim 1, wherein, The thermal management module comprises: a battery management system connected to the battery cluster management units of the battery clusters; an energy management system connected to the battery management system and the liquid cooling unit.

9. The energy storage container thermal management system of claim 1, wherein, The liquid cooling unit further comprises an electronic expansion valve arranged at the water outlet of the liquid cooling unit.

10. The energy storage container thermal management system of claim 1, wherein, Each of the battery clusters is provided with an energy storage converter connected to the battery packs.

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