Energy storage system liquid injection method, device, management unit and storage medium

Abstract

The application provides a liquid injection method and device of an energy storage system, a management unit and a storage medium. The method comprises the following steps: controlling a liquid injection pump, pumping cooling oil in a liquid injection source device into each battery pack unit through a cooling oil machine and a pipeline unit; detecting whether the cooling oil in each battery pack unit is fully injected; if it is detected that the cooling oil in each battery pack unit is fully injected, closing each battery pack unit to stop the injection of the cooling oil; after closing each battery pack unit, detecting whether the total exhaust valve overflows the cooling oil in a preset fluid state; if it is determined that the total exhaust valve overflows the cooling oil in the preset fluid state, closing the liquid injection pump and the total exhaust valve to complete the system liquid injection, so that the reliability of subsequent energy storage system heat dissipation is improved.

Description

Technical Field

[0001] This application relates to the field of energy storage system technology, and in particular to an energy storage system liquid injection method, apparatus, management unit and storage medium. Background Technology

[0002] Fully submerged energy storage systems are widely used in large-scale electrochemical energy storage scenarios. This system achieves efficient heat dissipation by immersing the battery pack in cooling oil, utilizing the liquid's high thermal conductivity and fluidity. Therefore, efficiently completing the liquid injection process for the energy storage system is particularly important.

[0003] In the existing technology, the traditional method of liquid injection for energy storage systems involves manually controlling the liquid injection pump and observing the liquid level of the battery pack to complete the independent liquid injection and sealing of each battery pack. Then, each battery pack is connected to the oil cooler through pipelines.

[0004] However, in the existing technology, by independently injecting liquid into each battery pack and connecting each battery pack to the oil cooler through pipelines, it is difficult to remove gas from the pipelines in the energy storage system, thereby reducing the reliability of heat dissipation of the energy storage system. Summary of the Invention

[0005] This application provides a liquid injection method, apparatus, management unit, and storage medium for an energy storage system, to solve the problem that by injecting liquid into each battery pack independently and connecting each battery pack to the oil cooler through pipelines, it is difficult to remove gas from the pipelines in the energy storage system, thereby reducing the reliability of heat dissipation of the energy storage system.

[0006] In a first aspect, this application provides a method for injecting electrolyte into an energy storage system. The energy storage system includes: a battery management unit, an injection pump, an oil cooler, a piping unit, and multiple battery pack units. Each battery pack unit is arranged in a preset layout and sequentially connected to the piping unit. A main vent valve is installed at a first preset position on the piping unit. The method is applied to the battery management unit and includes:

[0007] Control the injection pump to pump the cooling oil from the injection source equipment into each battery pack unit through the oil cooler and the pipeline unit.

[0008] Check if the cooling oil in each battery pack unit is full;

[0009] If it is detected that the cooling oil in each battery pack unit is full, then each battery pack unit is shut down to stop the injection of cooling oil;

[0010] After shutting down each battery pack unit, check whether the main vent valve overflows with cooling oil in a preset fluid state;

[0011] If it is determined that the cooling oil in the preset fluid state overflows from the main vent valve, then the injection pump and the main vent valve are closed to complete the system injection.

[0012] In one possible design, each battery pack unit includes a battery pack, an inlet pipe, an outlet pipe, and an exhaust valve. The battery pack is connected to both the inlet and outlet pipes. An inlet solenoid valve is installed on the inlet pipe, and an outlet solenoid valve is installed on the outlet pipe. Both the inlet and outlet solenoid valves are in an open state. The exhaust valve is installed at a second preset position on the battery pack. The control of the injection pump to pump cooling oil from the injection source equipment into each battery pack unit in sections through the oil cooler and the piping unit includes: controlling the injection pump to pump cooling oil from the injection source equipment into each battery pack in sections through the oil cooler, the piping unit, and the inlet pipe; during the process of pumping cooling oil into each battery pack in sections, air in the battery pack is discharged through the exhaust valve and the outlet pipe.

[0013] In one possible design, each battery pack unit further includes a liquid level detection sensor, which is installed at a third preset position within the battery pack. The detection of whether each battery pack unit is full of cooling oil includes: detecting whether each battery pack is full of cooling oil using the liquid level detection sensor. The step of closing each battery pack unit to stop the injection of cooling oil if it is detected that the cooling oil in each battery pack unit is full includes: generating a full signal if it is detected that the cooling oil in each battery pack is full; and closing the inlet solenoid valve and the outlet solenoid valve according to the full signal to stop the injection of cooling oil.

[0014] In one possible design, the piping unit further includes: a main pipeline, on which a main vent valve is installed, connecting each battery pack unit and the oil cooler; and a control injection pump, which pumps cooling oil from the injection source equipment into each battery pack unit in sections through the oil cooler and the piping unit, including: controlling the injection pump to pump cooling oil from the injection source equipment into each battery pack unit in sections through the oil cooler and the main pipeline.

[0015] In one possible design, after detecting whether the cooling oil in each battery pack unit is full, the method further includes: if it is detected that any battery pack is not full of cooling oil within a preset time, pausing the injection pump and retaining the current injection data of the energy storage system; testing the energy storage system based on the injection data to obtain a preliminary inspection report; integrating the injection data and the preliminary inspection report into a test report and outputting the test report.

[0016] In one possible design, before the control injection pump pumps the cooling oil from the injection source device into each battery pack unit through the oil cooler and the pipeline unit, the design further includes: controlling the opening of the inlet solenoid valve and outlet solenoid valve of each battery pack and starting the injection pump.

[0017] Secondly, this application provides a liquid injection device for an energy storage system. The energy storage system includes: a battery management unit, a liquid injection pump, an oil cooler, a pipeline unit, and multiple battery pack units. Each battery pack unit is arranged in a preset layout and sequentially connected to the pipeline unit. A main vent valve is installed at a first preset position on the pipeline unit. The device is applied to the battery management unit and includes:

[0018] The first control module is used to control the injection pump to pump the cooling oil in the injection source equipment into each battery pack unit through the oil cooler and the pipeline unit.

[0019] The first detection module is used to detect whether the cooling oil in each battery pack unit is full;

[0020] The first shut-off module is used to shut off each battery pack unit to stop injecting cooling oil if it is detected that the cooling oil in each battery pack unit is full.

[0021] The second detection module is used to detect whether the main exhaust valve overflows with cooling oil in a preset fluid state after each battery pack unit is shut down.

[0022] The second shut-off module is used to shut off the injection pump and the main vent valve if it is determined that the cooling oil in the preset fluid state has overflowed from the main vent valve, so as to complete the system injection.

[0023] Thirdly, this application provides an energy storage system, comprising: a battery management unit, an injection pump, an oil cooler, a piping unit, and multiple battery pack units. Each battery pack unit is arranged in a preset layout and sequentially connected to the piping unit. A main vent valve is installed at a first preset position on each piping unit. Each battery pack unit includes a battery pack, an inlet pipe, an outlet pipe, and a vent valve. The battery pack is connected to both the inlet pipe and the outlet pipe. An inlet solenoid valve is installed on the inlet pipe, and an outlet solenoid valve is installed on the outlet pipe. The solenoid valve is in the open state, and the vent valve is installed at the second preset position of the battery pack; each battery pack unit also includes a liquid level detection sensor, which is installed at the third preset position inside the battery pack; the pipeline unit also includes: a main pipeline, on which a main vent valve is installed, connecting each battery pack unit and the oil cooler respectively; the main pipeline is also connected to the inlet and outlet pipelines of each battery pack respectively; each vent valve and the main vent valve are equipped with vent pipelines, and each vent pipeline is connected to the return oil pipeline, which is connected to a common cooling oil recovery tank;

[0024] The battery management unit is specifically used for:

[0025] Control the injection pump to pump the cooling oil from the injection source equipment into each battery pack through the oil cooler, the main pipeline and the inlet pipeline in sections.

[0026] During the process of pumping cooling oil into each battery pack in separate zones, the air in the battery pack is discharged through the exhaust valve and the outlet pipeline;

[0027] The liquid level detection sensor is used to detect whether the cooling oil in each battery pack is full.

[0028] If it is detected that the cooling oil in each battery pack is full, a full signal is generated;

[0029] The inlet solenoid valve and the outlet solenoid valve are closed according to the full signal to stop the injection of cooling oil;

[0030] After shutting down each battery pack unit, check whether the main vent valve overflows with cooling oil in a preset fluid state;

[0031] If it is determined that the cooling oil in the preset fluid state overflows from the main vent valve, then the injection pump and the main vent valve are closed to complete the system injection.

[0032] Fourthly, this application provides a battery management unit, including: at least one processor and a memory;

[0033] The memory stores computer-executed instructions;

[0034] The at least one processor executes computer execution instructions stored in the memory, causing the at least one processor to perform the method described in the first aspect above and various possible designs of the first aspect.

[0035] Fifthly, this application provides a computer storage medium storing computer execution instructions, which, when executed by a processor, implement the method described in the first aspect and various possible designs of the first aspect.

[0036] The energy storage system liquid injection method, apparatus, management unit, and storage medium provided in this application, based on the energy storage system, control the liquid injection pump to pump cooling oil from the liquid injection source equipment into each battery pack unit through a cooler and piping unit; detect whether the cooling oil in each battery pack unit is full; if the cooling oil in each battery pack unit is full, shut down each battery pack unit to stop the injection of cooling oil; after shutting down each battery pack unit, detect whether the main vent valve overflows with cooling oil in a preset fluid state; if it is determined that the main vent valve overflows with cooling oil in a preset fluid state, shut down the liquid injection pump and the main vent valve to complete the system liquid injection. By uniformly injecting liquid into each battery pack unit and venting the gas of the energy storage system through each vent valve and the main vent valve, the reliability of subsequent heat dissipation of the energy storage system is improved. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram illustrating an application scenario of the liquid injection method for the energy storage system provided in the embodiments of this application;

[0039] Figure 2 Schematic flowchart of the liquid injection method for the energy storage system provided in the embodiments of this application Figure 1 ;

[0040] Figure 3 Schematic flowchart of the liquid injection method for the energy storage system provided in the embodiments of this application Figure 2 ;

[0041] Figure 4 A schematic diagram of the liquid injection device for the energy storage system provided in this application embodiment;

[0042] Figure 5 This is a schematic diagram of the energy storage system provided in the embodiments of this application;

[0043] Figure 6 This is a schematic diagram of the hardware structure of the battery management unit provided in an embodiment of this application. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] Fully submerged energy storage systems are widely used in large-scale electrochemical energy storage scenarios. This system achieves efficient heat dissipation by immersing the battery pack in cooling oil, utilizing the liquid's high thermal conductivity and fluidity. Therefore, efficiently completing the liquid injection process for the energy storage system is crucial. In existing technologies, traditional liquid injection methods for energy storage systems involve manually controlling the injection pump and observing the liquid level in each battery pack to achieve independent injection and sealing of each pack, followed by connecting each pack to the oil cooler via pipelines. However, in existing technologies, by independently injecting each battery pack and connecting them to the oil cooler via pipelines, it is difficult to expel gas from the pipelines within the energy storage system, thus reducing the reliability of heat dissipation.

[0046] To address the aforementioned technical problems, this application proposes the following technical concept: Considering the energy storage system, the inventors, based on the battery management unit in the energy storage system, control the injection pump to pump the cooling oil from the injection source device into each battery pack unit; if it is detected that the cooling oil in each battery pack unit is full, then each battery pack unit is shut down, and if it is detected that the cooling oil in the preset fluid state overflows from the main exhaust valve, then the injection pump and the main exhaust valve are shut down to complete the system injection, thereby improving the reliability of subsequent heat dissipation of the energy storage system.

[0047] Figure 1 This is a schematic diagram illustrating an application scenario of the liquid injection method for the energy storage system provided in this application embodiment.

[0048] like Figure 1 As shown, the energy storage system 10 in this scenario includes: a battery management unit 101, an injection pump 102, an oil cooler 103, a pipeline unit 104, and multiple battery pack units 105. The battery pack units 105 are arranged in a preset layout, and each battery pack unit 105 is connected to the pipeline unit 104 in sequence. A main exhaust valve 1042 is installed at the first preset position of the pipeline unit 104.

[0049] The battery management unit 101 can be a battery management system (BMS) or other management units.

[0050] The preset layout is from top to bottom, and the first preset position is the highest point of the pipeline unit 104.

[0051] The battery management unit 101 controls the injection pump 102 to pump cooling oil from the injection source device 20 into each battery pack unit 105 via the oil cooler 103 and piping unit 104. It detects whether each battery pack unit 105 is full of cooling oil. If it detects that each battery pack unit 105 is full, it shuts down each battery pack unit 105 to stop the injection of cooling oil. After shutting down each battery pack unit 105, it detects whether the main vent valve 1042 overflows with cooling oil in a preset fluid state. If it is determined that the main vent valve 1042 overflows with cooling oil in a preset fluid state, it shuts down the injection pump 102 and the main vent valve 1042 to complete the system injection. A detailed description using a specific embodiment follows.

[0052] Figure 2 Schematic flowchart of the liquid injection method for the energy storage system provided in the embodiments of this application Figure 1 The execution entity in this embodiment can be Figure 1 The battery management unit in the illustrated embodiment is not particularly limited in this embodiment. Figure 2 As shown, the method includes:

[0053] S201: Controls the injection pump to pump the cooling oil from the injection source equipment into each battery pack unit through the oil cooler and pipeline unit.

[0054] In this embodiment, each battery pack unit includes a battery pack, an inlet pipe, an outlet pipe, and an exhaust valve. An inlet solenoid valve is installed on the inlet pipe, and an outlet solenoid valve is installed on the outlet pipe. Both the inlet and outlet solenoid valves are in the open state. The exhaust valve is installed at a second preset position of the battery pack. Step S201 specifically includes steps a~b:

[0055] Step a: Control the injection pump to pump the cooling oil from the injection source equipment into each battery pack through the oil cooler, piping unit, and inlet piping.

[0056] In this embodiment, the battery pack can be a fully submerged energy storage pack or other types of battery packs.

[0057] Step b: During the process of pumping cooling oil into each battery pack in separate zones, air in the battery pack is discharged through the vent valve and outlet pipe.

[0058] The second preset position is the highest point at the top of the battery pack.

[0059] In addition, the exhaust valve is connected to the cooling oil recovery tank via a pipeline to inject the subsequently discharged cooling oil into the cooling oil recovery tank.

[0060] In this embodiment, the pipeline unit further includes: a main pipeline, on which a main vent valve is installed, connecting each battery pack unit and the oil cooler respectively; step S201 specifically includes: controlling the injection pump to pump the cooling oil in the injection source equipment into each battery pack unit through the oil cooler and the main pipeline.

[0061] In addition, before step S201, the procedure includes: opening the inlet and outlet solenoid valves of each battery pack and starting the injection pump.

[0062] S202: Check whether the cooling oil in each battery pack unit is full.

[0063] In this embodiment, each battery pack unit further includes a liquid level detection sensor, which is installed in a third preset position inside the battery pack; step S202 specifically includes: detecting whether the cooling oil in each battery pack is full by using the liquid level detection sensor.

[0064] Specifically, the coolant level of each battery pack is detected by a liquid level sensor to determine whether the coolant level of each battery pack is at the position of the liquid level sensor, so as to determine whether each battery pack is full.

[0065] For example, the third preset position is 5mm above the highest point of the battery inside the battery pack.

[0066] S203: If it is detected that the cooling oil in each battery pack unit is full, shut down each battery pack unit to stop the injection of cooling oil.

[0067] Specifically, step S203 includes steps a~b:

[0068] Step a: If it is detected that the cooling oil in each battery pack is full, a full signal is generated.

[0069] Step b: Close the inlet and outlet solenoid valves according to the full filling signal to stop the injection of cooling oil.

[0070] Specifically, the inlet and outlet solenoid valves are closed according to the full filling signal to stop the injection of cooling oil and to hydraulically isolate the corresponding battery pack from the circulating injection line.

[0071] S204: After shutting down each battery pack unit, check whether the main vent valve overflows with cooling oil in a preset fluid state.

[0072] In this embodiment, the preset fluid state can be a bubble-free pure cooling oil fluid state, or other fluid states.

[0073] The state of the pure cooling oil fluid without bubbles can be determined by manual observation.

[0074] In addition, the main exhaust valve is connected to the cooling oil recovery tank via a pipeline to inject the discharged cooling oil into the cooling oil recovery tank.

[0075] S205: If it is determined that the cooling oil in the preset fluid state is overflowing from the main vent valve, then close the injection pump and the main vent valve to complete the system injection.

[0076] In addition, the corresponding pipeline of the vent valve on the top of each battery pack can be disconnected from the return cooling oil tank and closed to complete the sealing of the entire energy storage system.

[0077] In summary, the liquid injection method for the energy storage system provided in this embodiment, based on the energy storage system, controls the liquid injection pump to pump the cooling oil from the liquid injection source equipment into each battery pack unit through the oil cooler and pipeline unit; it detects whether the cooling oil in each battery pack unit is full; if the cooling oil in each battery pack unit is detected to be full, the battery pack unit is shut down to stop the injection of cooling oil; after shutting down each battery pack unit, it detects whether the main vent valve overflows with cooling oil in a preset fluid state; if it is determined that the main vent valve overflows with cooling oil in a preset fluid state, the liquid injection pump and the main vent valve are shut down to complete the system liquid injection. By uniformly injecting liquid into each battery pack unit and venting the gas of the energy storage system through each vent valve and the main vent valve, the reliability of subsequent heat dissipation of the energy storage system is improved.

[0078] In addition, the liquid injection method for the energy storage system provided in this embodiment can also optimize the allocation of injection pumps through a load balancing algorithm when multiple battery pack units are injected with liquid at the same time, so as to avoid resource conflicts and improve overall production efficiency.

[0079] Furthermore, the liquid injection method for the energy storage system provided in this embodiment achieves precise management of the liquid injection path of the energy storage system by setting a controlled solenoid valve for each battery pack and performing joint and independent control based on the cooling oil filling signal. Moreover, it ensures that the liquid injection channels of each battery pack are unobstructed and independently filled regardless of its spatial location, fundamentally guaranteeing the uniformity, integrity, and first-time success rate of liquid injection for each battery pack.

[0080] In addition, the liquid injection method of the energy storage system provided in this embodiment sets all exhaust valves and the main exhaust valve to the open state and leads the cooling oil back to the recovery tank. This allows the cooling oil to continuously push the air in the pipeline to a high point and discharge it during the filling process, ensuring that there is no gas residue in the pipeline system from the source and eliminating the risk of local overheating and circulation failure caused by air resistance.

[0081] In addition, the liquid injection method of the energy storage system provided in this embodiment effectively prevents the coolant from abnormally migrating from the upper battery pack to the lower battery pack due to gravity during system transportation, installation tilting, or start-up and shutdown by ensuring that each battery pack is fully filled and the solenoid valve is closed when liquid injection is completed. This provides a stable and reliable initial hydraulic environment for the energy storage system.

[0082] Furthermore, the liquid injection method for the energy storage system provided in this embodiment automatically injects liquid into the system, avoiding manual intervention, observation, and repeated liquid replenishment operations, thus improving the liquid injection efficiency of the energy storage system. Moreover, this method can easily adapt to systems of different capacities and different series-parallel structures, demonstrating good versatility and potential for widespread application.

[0083] Figure 3 Schematic flowchart of the liquid injection method for the energy storage system provided in the embodiments of this application Figure 2 In the embodiments of this application, in Figure 2 Based on the provided embodiments, a detailed explanation is given of the specific implementation method for handling battery packs that are not fully filled with cooling oil after step S202. For example... Figure 3 As shown, the method includes:

[0084] S301: If it is detected that any battery pack is not filled with cooling oil within a preset time, the injection pump will be paused and the current injection data of the energy storage system will be retained.

[0085] In this embodiment, the preset time can be any time period of 20 minutes, 30 minutes, or 40 minutes, or other time periods.

[0086] In this embodiment, the injection data includes information such as the real-time pressure of the injection pump, the flow rate of the cooling oil, the amount of cooling oil injected, the cell number, and the ambient temperature and humidity.

[0087] S302: Test the energy storage system based on the fluid injection data to obtain an initial inspection report.

[0088] Specifically, based on the injection data, check whether the injection pipeline of the energy storage system is blocked, whether the sensors are abnormal, and whether the solenoid valve is stuck, so as to quickly locate the obvious hardware faults of the energy storage system and obtain an initial inspection report.

[0089] S303: Integrate the injection data and initial inspection report into a test report and output the test report.

[0090] In summary, the liquid injection method for the energy storage system provided in this embodiment, by pausing the injection pump and retaining the current liquid injection data of the energy storage system if any battery pack is found to be not fully filled with cooling oil within a preset time, and then testing the energy storage system based on the liquid injection data to obtain an initial inspection report, and integrating the liquid injection data and the initial inspection report into a test report and outputting the test report, the above-mentioned automatic fault diagnosis process for battery pack liquid injection timeout can quickly and efficiently trace the root cause of the fault, stabilize the subsequent operation of the energy storage system, and at the same time ensure the consistency and safety of the battery pack products.

[0091] Figure 4 This is a schematic diagram of the liquid injection device for an energy storage system provided in an embodiment of this application. The liquid injection device for the energy storage system includes: a first control module 401, a first detection module 402, a first shutdown module 403, a second detection module 404, and a second shutdown module 405.

[0092] The first control module 401 is used to control the injection pump to pump the cooling oil in the injection source equipment into each battery pack unit through the oil cooler and pipeline unit.

[0093] The first detection module 402 is used to detect whether the cooling oil in each battery pack unit is full;

[0094] The first shut-off module 403 is used to shut down each battery pack unit to stop injecting cooling oil if it is detected that the cooling oil in each battery pack unit is full.

[0095] The second detection module 404 is used to detect whether cooling oil in a preset fluid state overflows from the main exhaust valve after each battery pack unit is shut down.

[0096] The second shut-off module 405 is used to shut off the injection pump and the main exhaust valve if it is determined that the cooling oil in the preset fluid state has overflowed from the main exhaust valve, so as to complete the system injection.

[0097] In one possible implementation, the first control module 401 specifically includes:

[0098] The control unit is used to control the injection pump, which pumps the cooling oil from the injection source equipment into each battery pack through the oil cooler, piping unit and inlet piping.

[0099] The discharge unit is used to discharge air from the battery pack through the exhaust valve and outlet pipeline during the process of pumping cooling oil into each battery pack in the partition.

[0100] In one possible implementation, the first detection module 402 is specifically used to: detect whether the cooling oil in each battery pack is full using a liquid level detection sensor; the first shut-off module 403 specifically includes:

[0101] The generation unit is used to generate a full signal if it is detected that the cooling oil in each battery pack is full;

[0102] The shut-off unit is used to close the inlet and outlet solenoid valves according to the full signal to stop the injection of cooling oil.

[0103] In one possible implementation, the first control module 401 is specifically used to: control the injection pump to pump the cooling oil from the injection source equipment into each battery pack unit through the oil cooler and the main pipeline.

[0104] In one possible implementation, the device further includes:

[0105] The retention module is used to pause the injection pump and retain the current injection data of the energy storage system if it is detected that any battery pack is not filled with cooling oil within a preset time.

[0106] The third testing module is used to test the energy storage system based on the liquid injection data to obtain an initial inspection report;

[0107] The integration module is used to combine injection data and initial inspection reports into a test report and output the test report.

[0108] In one possible implementation, the device further includes:

[0109] The second control module is used to control the opening of the inlet and outlet solenoid valves of each battery pack and to start the injection pump.

[0110] The apparatus provided in this embodiment can be used to execute the technical solutions of the above method embodiments. Its implementation principle and technical effects are similar, and will not be described again here.

[0111] Figure 5This application provides a schematic diagram of the energy storage system. The energy storage system 10 includes: a battery management unit 101, an injection pump 102, an oil cooler 103, a piping unit 104, and multiple battery pack units 105. Each battery pack unit 105 is arranged in a preset layout and sequentially connected to the piping unit 104. A main vent valve 1042 is installed at a first preset position on the piping unit 104. Each battery pack unit 105 includes a battery pack 1051, an inlet pipe 1052, an outlet pipe 1053, and a vent valve 1054. The battery pack 1051 is connected to both the inlet pipe 1052 and the outlet pipe 1053. An inlet solenoid valve 10521 is installed on the inlet pipe 1052, and an outlet solenoid valve 10531 is installed on the outlet pipe 1053. The outlet solenoid valve 10531 is in the open state, and the exhaust valve 1054 is installed in the second preset position of the battery pack 1051; each battery pack unit 105 also includes a liquid level detection sensor 1055, which is installed in the third preset position inside the battery pack 1051; the pipeline unit 104 also includes: a main pipeline 1041, on which a main exhaust valve 1042 is installed, which is connected to each battery pack unit 105 and the oil cooler 103 respectively; the main pipeline 1041 is also connected to the inlet pipeline 1052 and the outlet pipeline 1053 of each battery pack 1051 respectively; each exhaust valve 1054 and the main exhaust valve 1042 are equipped with an exhaust pipeline, and each exhaust pipeline is connected to the return oil pipeline, which is connected to a common cooling oil recovery tank 30.

[0112] The main pipeline 1041 is connected to the oil cooler 103 via an oil outlet and an oil return end.

[0113] The battery management unit 101 is specifically used for:

[0114] Control the injection pump 102 to pump the cooling oil in the injection source device 20 into each battery pack 1051 through the oil cooler 103, the main pipeline 1041 and the inlet pipeline 1052.

[0115] During the process of cooling oil being pumped into each battery pack 1051 in separate sections, air in the battery pack 1051 is discharged through the exhaust valve 1054 and the outlet pipe 1053.

[0116] The liquid level sensor 1055 detects whether the cooling oil in each battery pack 1051 is full.

[0117] If it is detected that the cooling oil in each battery pack 1051 is full, a full signal is generated.

[0118] The inlet solenoid valve 10521 and the outlet solenoid valve 10531 are closed upon receiving the full signal to stop the injection of cooling oil.

[0119] After closing each battery pack unit 105, check whether the main vent valve 1042 overflows with cooling oil in a preset fluid state.

[0120] If it is determined that the cooling oil in the preset fluid state overflows from the main vent valve 1042, then the injection pump 102 and the main vent valve 1042 are closed to complete the system injection.

[0121] Among them, the main vent valve 1042 is a pipeline vent valve, which is used for venting during liquid injection.

[0122] In addition, the energy storage system also includes an automatic venting valve for pipelines, which is used to automatically vent the small amount of gas bubbles generated during later product operation.

[0123] In addition, the battery pack unit 105 may also include a manual oil inlet valve and a manual oil outlet valve.

[0124] Figure 6 This is a schematic diagram of the hardware structure of the battery management unit provided in an embodiment of this application. Figure 6 As shown, the battery management unit of this embodiment includes a processor 601 and a memory 602; the memory stores computer-executable instructions; at least one processor executes the computer-executable instructions stored in the memory, causing at least one processor to perform the method described above.

[0125] Alternatively, the memory 602 can be either standalone or integrated with the processor 601.

[0126] When the memory 602 is set up independently, the battery management unit also includes a bus 603 for connecting the memory 602 and the processor 601.

[0127] This application also provides a computer storage medium storing computer execution instructions, which, when executed by a processor, implement the above method.

[0128] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method.

[0129] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative; for instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or modules, and may be electrical, mechanical, or other forms.

[0130] The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to implement the solution of this embodiment according to actual needs.

[0131] Furthermore, the functional modules in the various embodiments of this application can be integrated into one processing unit, or each module can exist physically separately, or two or more modules can be integrated into one unit. The unit composed of the above modules can be implemented in hardware or in the form of hardware plus software functional units.

[0132] The integrated modules described above, implemented as software functional modules, can be stored in a computer-readable storage medium. These software functional modules, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute some steps of the methods of the various embodiments of this application.

[0133] It should be understood that the aforementioned processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. A general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly manifested as execution by a hardware processor, or execution by a combination of hardware and software modules within the processor.

[0134] The memory may include high-speed RAM, and may also include non-volatile storage (NVM), such as at least one disk storage device, and may also be a USB flash drive, external hard drive, read-only memory, disk or optical disc, etc.

[0135] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.

[0136] The aforementioned storage media can be implemented from any type of volatile or non-volatile storage device or a combination thereof, such as Static Random-Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The storage media can be any available medium accessible to general-purpose or special-purpose computers.

[0137] An exemplary storage medium is coupled to a processor, enabling the processor to read information from and write information to the storage medium. Alternatively, the storage medium can be an integral part of the processor. Both the processor and the storage medium can reside in an Application Specific Integrated Circuit (ASIC). Alternatively, the processor and storage medium can exist as discrete components in an electronic device or host device.

[0138] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0139] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A method for injecting liquid into an energy storage system, characterized in that, The energy storage system includes: a battery management unit, a liquid injection pump, an oil cooler, a piping unit, and multiple battery pack units. Each battery pack unit is arranged in a preset layout and sequentially connected to the piping unit. A main vent valve is installed at a first preset position on the piping unit. The method is applied to the battery management unit and includes: Control the injection pump to pump the cooling oil from the injection source equipment into each battery pack unit through the oil cooler and the pipeline unit. Check if the cooling oil in each battery pack unit is full; If it is detected that the cooling oil in each battery pack unit is full, then each battery pack unit is shut down to stop the injection of cooling oil; After shutting down each battery pack unit, check whether the main vent valve overflows with cooling oil in a preset fluid state; If it is determined that the cooling oil in the preset fluid state overflows from the main vent valve, then the injection pump and the main vent valve are closed to complete the system injection.

2. The method according to claim 1, characterized in that, Each battery pack unit includes a battery pack, an inlet pipe, an outlet pipe, and an exhaust valve. The battery pack is connected to the inlet pipe and the outlet pipe respectively. An inlet solenoid valve is installed on the inlet pipe, and an outlet solenoid valve is installed on the outlet pipe. The inlet solenoid valve and the outlet solenoid valve are in the open state. The exhaust valve is installed at a second preset position of the battery pack. The controlled injection pump pump pumps cooling oil from the injection source equipment into each battery pack unit via the oil cooler and the pipeline unit, including: Control the injection pump to pump the cooling oil from the injection source equipment into each battery pack through the oil cooler, the pipeline unit, and the inlet pipeline. During the process of pumping cooling oil into each battery pack in separate zones, air in the battery pack is discharged through the exhaust valve and the outlet pipeline.

3. The method according to claim 2, characterized in that, Each battery pack unit also includes a liquid level detection sensor, which is installed at a third preset position within the battery pack. The detection of whether the cooling oil in each battery pack unit is full includes: The liquid level detection sensor is used to detect whether the cooling oil in each battery pack is full. The step of shutting down each battery pack unit to stop injecting cooling oil if it is detected that the cooling oil in each battery pack unit is full includes: If it is detected that the cooling oil in each battery pack is full, a full signal is generated; The inlet solenoid valve and the outlet solenoid valve are closed according to the full signal to stop the injection of cooling oil.

4. The method according to claim 1, characterized in that, The pipeline unit also includes: a main pipeline, on which a main exhaust valve is installed, which is connected to each battery pack unit and the oil cooler respectively; The controlled injection pump pump pumps cooling oil from the injection source equipment into each battery pack unit via the oil cooler and the pipeline unit, including: Control the injection pump to pump the cooling oil from the injection source equipment into each battery pack unit through the oil cooler and the main pipeline.

5. The method according to claim 1, characterized in that, After checking whether the cooling oil in each battery pack unit is full, the method further includes: If it is detected that any battery pack is not filled with cooling oil within a preset time, the injection pump will be paused and the injection data of the energy storage system at the current moment will be retained. The energy storage system is tested based on the injection data to obtain an initial inspection report; The injection data and the initial inspection report are integrated into a test report, and the test report is output.

6. The method according to claim 3, characterized in that, Before the controlled injection pump pumps pump the cooling oil from the injection source equipment into each battery pack unit through the oil cooler and the pipeline unit, the following steps are included: The inlet and outlet solenoid valves of each battery pack are opened, and the injection pump is started.

7. A liquid injection device for an energy storage system, characterized in that, The energy storage system includes: a battery management unit, a liquid injection pump, an oil cooler, a piping unit, and multiple battery pack units. The battery pack units are arranged in a preset layout and are sequentially connected to the piping unit. A main vent valve is installed at a first preset position on the piping unit. The device is applied to the battery management unit and includes: The first control module is used to control the injection pump to pump the cooling oil in the injection source equipment into each battery pack unit through the oil cooler and the pipeline unit. The first detection module is used to detect whether the cooling oil in each battery pack unit is full; The first shut-off module is used to shut off each battery pack unit to stop injecting cooling oil if it is detected that the cooling oil in each battery pack unit is full. The second detection module is used to detect whether the main exhaust valve overflows with cooling oil in a preset fluid state after each battery pack unit is shut down. The second shut-off module is used to shut off the injection pump and the main vent valve if it is determined that the cooling oil in the preset fluid state has overflowed from the main vent valve, so as to complete the system injection.

8. An energy storage system, characterized in that, The energy storage system includes: a battery management unit, an injection pump, an oil cooler, a piping unit, and multiple battery pack units. The battery pack units are arranged in a preset layout and sequentially connected to the piping unit. A main vent valve is installed at a first preset position on each piping unit. Each battery pack unit includes a battery pack, an inlet pipe, an outlet pipe, and a vent valve. The battery pack is connected to both the inlet and outlet pipes. An inlet solenoid valve is installed on the inlet pipe, and an outlet solenoid valve is installed on the outlet pipe. Both the inlet and outlet solenoid valves are in an open state. The vent valve is installed at a second preset position in the battery pack; each battery pack unit also includes a liquid level detection sensor, which is installed at a third preset position inside the battery pack; the pipeline unit also includes: a main pipeline, on which a main vent valve is installed, connecting each battery pack unit and the oil cooler respectively; the main pipeline is also connected to the inlet and outlet pipelines of each battery pack respectively; each vent valve and the main vent valve are equipped with vent pipelines, each vent pipeline is connected to a return oil pipeline, and the return oil pipeline is connected to a common cooling oil recovery tank; The battery management unit is specifically used for: Control the injection pump to pump the cooling oil from the injection source equipment into each battery pack through the oil cooler, the main pipeline and the inlet pipeline in sections. During the process of pumping cooling oil into each battery pack in separate zones, the air in the battery pack is discharged through the exhaust valve and the outlet pipeline; The liquid level detection sensor is used to detect whether the cooling oil in each battery pack is full. If it is detected that the cooling oil in each battery pack is full, a full signal is generated; The inlet solenoid valve and the outlet solenoid valve are closed according to the full signal to stop the injection of cooling oil; After shutting down each battery pack unit, check whether the main vent valve overflows with cooling oil in a preset fluid state; If it is determined that the cooling oil in the preset fluid state overflows from the main vent valve, then the injection pump and the main vent valve are closed to complete the system injection.

9. A battery management unit, characterized in that, include: At least one processor and memory; The memory stores computer-executed instructions; The at least one processor executes computer execution instructions stored in the memory, causing the at least one processor to perform the method as described in any one of claims 1 to 6.

10. A computer storage medium, characterized in that, The computer storage medium stores computer execution instructions, which, when executed by the processor, implement the method as described in any one of claims 1 to 6.

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