Control method of liquid cooling charging system and charging system

Abstract

The invention discloses a control method of a liquid cooling charging system and the charging system, and relates to the technical field of charging. Wherein the liquid cooling charging system comprises a plurality of immersed power modules, a plurality of switch groups and a controller, each immersed power module is connected with an external cold source through the corresponding switch group, the plurality of switch groups are also connected with the controller, and the method is executed by the controller; the method comprises the steps that in response to a charging instruction, at least one module group meeting a preset condition is determined, and the module group comprises at least one immersed power module; and controlling the switch group corresponding to the at least one module group to be closed, so that the external cold source dissipates heat of the corresponding module group. Therefore, the problems that the one-time investment cost of a high-power oil pump and a large-size direct-current fan is high and the heat dissipation reliability of the system is reduced due to full-load operation of the high-power direct-current oil pump and the large-size direct-current fan can be solved by performing grouped heat dissipation on the power modules.

Description

[0001] A control method and charging system for a liquid-cooled charging system Technical Field This application relates to the field of charging technology, and in particular to a control method and charging system for a liquid-cooled charging system. Background Technology

[0002] Existing liquid-cooled electric vehicle charging systems (especially immersion liquid-cooled systems) generally employ a high-power DC oil pump, a large-size DC fan, and a radiator assembly to form an integrated cooling system. However, in high-power charging systems, immersion liquid-cooled systems require multiple modules to work together, which necessitates that the DC pumps and DC fans used for cooling must meet the cooling requirements of all modules operating at maximum power.

[0003] However, because immersion liquid cooling systems use high-viscosity insulating coolants such as mineral oil and silicone oil, the oil demand is large, resulting in a correspondingly large oil tank capacity and volume. The initial investment cost for high-power oil pumps and fans is also high. Furthermore, during startup or low-power operation, the heat dissipation requirements are low, leading to unnecessary consumption. In addition, the full-load operation of high-power DC oil pumps and large-size DC fans can also affect the reliability of the system's heat dissipation. Summary of the Invention

[0004] The main objective of this application is to provide a control method and a charging system for a liquid-cooled charging system. By grouping the power modules for heat dissipation, the method solves the problems of high initial investment costs for high-power oil pumps and large-size DC fans, as well as reduced system heat dissipation reliability caused by the full-load operation of high-power DC oil pumps and large-size DC fans.

[0005] To achieve the above objectives, this application provides a control method for a liquid-cooled charging system. The liquid-cooled charging system includes multiple immersion power modules, multiple switch groups, and a controller. Each immersion power module is connected to an external cold source through a corresponding switch group. The multiple switch groups are also connected to the controller. The method is executed by the controller. The method includes: responding to a charging command, determining at least one module group that meets preset conditions, wherein the module group includes at least one immersion power module, and the preset conditions are that the module group contains at least one immersion power module in a working state; controlling the switch group corresponding to the at least one module group to close, so that the external cold source dissipates heat from the corresponding module group.

[0006] Optionally, the number of module groups that meet the preset conditions is N, where N is a constant greater than or equal to 2. The step of controlling the closing of the switch group corresponding to the at least one module group to allow the external cold source to dissipate heat to the corresponding module group includes: determining the heat dissipation time of each module group that meets the preset conditions, and controlling the closing of the switch group to allow the N module groups that meet the preset conditions to sequentially dissipate heat in a time-sharing cycle according to the heat dissipation time and the preset heat dissipation sequence.

[0007] Optionally, when the module groups are obtained based on a solid-state grouping strategy, the step of controlling the closing of switch groups to sequentially and cyclically dissipate heat according to the heat dissipation time and preset heat dissipation sequence includes: determining the heat dissipation time of each module group that meets the preset conditions; starting from the first time period, sequentially controlling the switch groups corresponding to each module group to close during the heat dissipation time of each module group according to the preset heat dissipation sequence, so that the external cold source dissipates heat to the corresponding module group; and cyclically executing the heat dissipation process of each module group until all module groups that meet the preset conditions have completed heat dissipation.

[0008] Optionally, when the module groups are obtained based on a dynamic grouping strategy, the step of controlling the closing of switch groups to sequentially and cyclically dissipate heat according to the heat dissipation time and preset heat dissipation sequence includes: determining the heat dissipation sequence of each module group based on the operating power of the immersion power modules in each module group that meets the preset conditions; determining the heat dissipation time of each module group that meets the preset conditions; starting from the first time period, sequentially controlling the switch groups corresponding to each module group to close during the heat dissipation time of each module group according to the heat dissipation sequence, so that the external cold source dissipates heat to the corresponding module group; and cyclically executing the heat dissipation process of each module group until all module groups that meet the preset conditions have completed heat dissipation.

[0009] Optionally, determining the heat dissipation time of each module group that meets the preset conditions includes: determining the maximum working time based on the number of immersion power modules in the module group, the maximum output power of the immersion power modules, and the time difference between the temperature rise of a preset mass of coolant in the immersion power modules from the initial temperature to the preset maximum temperature; and determining the heat dissipation time of each module group that meets the preset conditions based on the maximum working time.

[0010] Optionally, when the module groups are obtained based on a dynamic grouping strategy, determining the heat dissipation time of each module group that meets the preset conditions includes: for any module group that meets the preset conditions, determining the heat dissipation time of the module group based on the number of immersion power modules in the module group, the actual operating power of the immersion power modules in the module group, and the time difference between the temperature rise of the insulating coolant of a preset mass in the immersion power modules in the module group from the initial temperature to the preset maximum temperature; or, the heat dissipation time of each module group is the maximum working time.

[0011] Optionally, when the module groups are obtained based on a solid-state grouping strategy, the heat dissipation time of each module group is the same.

[0012] Optionally, if the module group is obtained based on a dynamic grouping strategy, and a new immersion power module enters the working state, the immersion power modules are regrouped according to their operating power.

[0013] Optionally, each switch group includes at least one switch; when the switch group includes one switch, each switch group is connected to the cold source inlet and the external cold source outlet of the immersion power module; when the switch group includes two switches, the switches are a first switch and a second switch, the first switch is connected to the cold source inlet and the external cold source outlet of the immersion power module, and the second switch is connected to the cold source outlet and the external cold source inlet of the immersion power module.

[0014] Furthermore, to achieve the above objectives, this application also provides a charging system, comprising: at least two charging modules, a controller, a power distribution device, and at least one charging interface; wherein the power distribution device is connected to the controller, each charging module, and each charging interface respectively; the charging modules are used to convert AC power from the power grid into DC power and provide it to the charging interfaces; the controller is used to acquire the power demand of each charging interface and generate a scheduling command based on the connection relationship of the controllable switches in the power distribution device and the power demand; the controller is also used to control the charging system based on the method of any one of claims 1 to 9; the power distribution device is used to control the opening or closing of the controllable switches according to the scheduling command to distribute the output power of each charging module to each charging interface.

[0015] This application constructs a multi-module shared liquid-cooled charging system (including a shared circulation pump and oil tank) and groups the multiple power modules contained in the system for heat dissipation. This allows the system to circulate insulating coolant to only one or a portion of the module groups at a time, thereby significantly reducing the capacity requirement of the liquid cooling circulation system, reducing the initial investment cost of the heat dissipation unit, and effectively compressing the overall size of the supercharging system. At the same time, this application enables the oil pump and cooling fan to operate within a stable range during long-term operation, avoiding the problem of reduced system heat dissipation reliability caused by the full-load operation of the oil pump and cooling fan. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the immersion power module according to an embodiment of this application; Figure 2This is a schematic diagram of the connection between the immersion power module and the external cold source in an embodiment of this application; Figure 3 This is a schematic diagram of the internal structure of the external cold source in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a liquid-cooled charging system provided in an embodiment of this application; Figure 5 This is a flowchart of a control method for a liquid-cooled charging system provided in an embodiment of this application; Figure 6 This is a schematic diagram of a solid-state grouping strategy for heat dissipation provided in an embodiment of this application; Figure 7 This is a schematic diagram of grouped heat dissipation of a 720kW liquid-cooled charging system provided in an embodiment of this application; Figure 8 This is a schematic diagram of a dynamic grouping strategy for heat dissipation provided in an embodiment of this application; Figure 9 This is a schematic diagram of a solid-state grouping strategy with a switch group containing only one switch, provided in an embodiment of this application. Figure 10 This is a schematic diagram of another immersion liquid-cooled charging system provided in the embodiments of this application; Figure 11 This is a schematic diagram of the physical structure of a controller provided in an embodiment of this application.

[0017] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions 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.

[0019] Existing liquid-cooled electric vehicle charging systems (especially immersion liquid-cooled systems) generally employ a high-power DC oil pump, a large-size DC fan, and a radiator assembly to form an integrated cooling system. However, in high-power charging systems, immersion liquid-cooled systems require multiple modules to work together, which necessitates that the DC pumps and DC fans used for cooling must meet the cooling requirements of all modules operating at maximum power.

[0020] However, because immersion liquid cooling systems use high-viscosity insulating coolants such as mineral oil and silicone oil, the oil demand is large, resulting in a correspondingly large oil tank capacity and volume. The initial investment cost for high-power oil pumps and fans is also high. Furthermore, during startup or low-power operation, the heat dissipation requirements are low, leading to unnecessary consumption. In addition, the full-load operation of high-power DC oil pumps and large-size DC fans can also affect the reliability of the system's heat dissipation.

[0021] In existing technologies, liquid cooling systems typically employ parallel or serial cooling methods for multiple charging modules. For example, application CN117183786B, entitled "Liquid Cooling System and Control Method and Device for Charging Pile," discloses a parallel circulating cooling pipeline for multiple parallel charging modules, allowing for simultaneous cooling under steady-state conditions. However, the above solution is only applicable to conventional liquid-cooled charging systems (non-immersion charging systems), where the coolant only flows within the cooling pipeline, requiring a smaller liquid volume. Immersion liquid-cooled charging systems, such as... Figure 1 As shown, the PCBA in the charging module is completely immersed in the sealed charging module housing, which is filled with insulating coolant. For high-power overcharging systems, the demand for insulating coolant is large, requiring a large oil tank to participate in the system circulation.

[0022] To make it easier to understand, the following will be combined with... Figure 1 , Figure 2 as well as Figure 3 First, we will introduce the overall hardware structure of the immersion power module, the connection between the immersion power module and the external cold source, and the internal structure of the external cold source in detail.

[0023] Please refer to the following first. Figure 1 , Figure 1 This is a schematic diagram of the structure of the immersion power module according to an embodiment of this application, as shown below. Figure 1 As shown, the immersion power module mainly consists of a sealed housing, a complete PCBA assembly, a high-insulation coolant, and cold source inlet and outlet ports.

[0024] The sealed housing forms a completely airtight cavity, ensuring no leakage of the insulating coolant. The PCBA assembly contains all power electronic devices and control circuits, all of which are immersed in high-insulation coolant for direct heat dissipation. Temperature detection devices are installed at both the inlet and outlet ports. These devices can interact in real time with the external cold source control system via communication protocols such as CAN, 485, or 232 to control the circulation of the insulating coolant. The inlet and outlet ports employ a specially designed check valve structure to effectively prevent backflow of the insulating coolant, ensuring unidirectional circulation.

[0025] Please refer to Figure 2 , Figure 2This is a schematic diagram of the connection between the immersion power module and the external cold source in an embodiment of this application, as shown below. Figure 2 As shown, the cold source outlet port of the immersion power module is connected to the inlet port of an external cold source, and the cold source inlet port is connected to the outlet port of an external cold source. The working principle of the immersion power module is as follows: When the power module is put into operation, the heat generated by the power devices is directly absorbed by the surrounding insulating coolant, causing the temperature of the insulating coolant to gradually rise. The built-in temperature detection device collects the temperature data of the insulating coolant in real time. When the temperature reaches a certain threshold, the controller of the charging system starts the external cold source circulation device. At this time, the high-temperature insulating coolant is pumped out of the cavity of the power module, while the low-temperature insulating coolant, after being treated by the external cold source, is injected into the cavity, forming a closed-loop heat exchange. The discharged high-temperature insulating coolant is cooled by the external cold source and then re-enters the circulation system, continuously providing cooling for the power module.

[0026] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the internal structure of the external cold source in this embodiment of the application. The cold source mainly consists of core components such as a radiator, a cooling fan, an oil pump, an oil reservoir, and a cold source controller. The cold source can select different oil pumps as the circulation power source depending on the type of coolant used in the immersion power module. The radiator and cooling fan are used to dissipate heat from the high-temperature insulating coolant; the cold source controller is used to control the start / stop and speed of the fan and oil pump.

[0027] Because immersion power modules often use high-viscosity insulating coolants such as mineral oil and silicone oil, the oil demand is large, resulting in a correspondingly large oil reservoir capacity and volume. The initial investment cost for high-power oil pumps and fans is also high. Furthermore, the full-load operation of high-power DC oil pumps and large-size DC fans can affect the reliability of system heat dissipation.

[0028] Based on this, this application proposes a control method for a liquid-cooled charging system. Referring to the overall structure of the immersion power module and external cold source described above, the liquid-cooled charging system, the control method of the liquid-cooled charging system, and the charging system of the embodiments of this application will be described in detail below.

[0029] Please see Figure 4 , Figure 4 This is a schematic diagram of a liquid-cooled charging system provided in an embodiment of this application. The liquid-cooled charging system includes multiple immersion power modules, multiple switch groups, and a controller. Each immersion power module is connected to an external cold source through a corresponding switch group, and the multiple switch groups are also connected to the controller.

[0030] The controller is used to control each switch group to turn off based on the control method of the liquid-cooled charging system in the embodiments of this application, so that the external cold source can dissipate heat from each immersion power module.

[0031] Please see Figure 5 , Figure 5 This is a flowchart illustrating a control method for a liquid-cooled charging system provided in an embodiment of this application. It should be noted that this method can be applied to, for example... Figure 4 The liquid-cooled charging system shown. The method includes: S510, in response to a charging command, determines at least one module group that meets preset conditions, the module group including at least one immersion power module, wherein the preset condition is that the module group includes at least one immersion power module in an operating state. S520 controls the closing of at least one switch group corresponding to a module group so that an external cold source can dissipate heat to the corresponding module group.

[0032] Understandably, this method can be executed by a controller, which can group the immersion power modules based on this control method and control the corresponding switch groups of each module group to turn off, so that the external cold source can dissipate heat from each immersion power module. At any given time, only one or a portion of the module groups circulate the insulating coolant, thereby reducing the capacity requirement of the liquid cooling circulation system. This not only ensures low initial investment cost of the system's heat dissipation unit but also reduces the size of the overcharging system. Furthermore, during long-term operation, the method of this embodiment can ensure the stable operation of the oil pump and cooling fan, avoiding output instability caused by sudden power increases or decreases, thus ensuring the stability of the heat dissipation unit.

[0033] In the specific implementation process, the controller first responds to the charging command and determines at least one module group that meets the preset conditions. It should be noted that the module group that meets the preset conditions includes at least one immersion power module in working state.

[0034] In this embodiment, the number of module groups that meet the preset conditions is set to N, where N is a constant greater than or equal to 2. This embodiment takes N equal to 2 as an example for explanation. The module groups that meet the preset conditions are respectively set as the first module group and the second module group.

[0035] Furthermore, the heat dissipation time of the first module group and the second module group is determined. According to the heat dissipation time and the preset heat dissipation sequence, the external cold source is used to circulate heat dissipation to the first module group and the second module group in a time-sharing manner by controlling the closing of the switch groups of the first module group and the second module group.

[0036] Specifically, taking the preset heat dissipation sequence of the first module group and the second module group as an example, this embodiment first controls the switch group corresponding to the first module group to close, and then dissipates heat from the first module group according to the heat dissipation time of the first module group. Then, it controls the switch group corresponding to the second module group to close, and then dissipates heat from the second module group according to the heat dissipation time of the second module group, until the heat dissipation of the first module group and the second module group is completed.

[0037] The heat dissipation time of the first module group and the second module group can be determined based on the number of immersion power modules in the module group, the maximum output power of the immersion power modules, and the time difference between the initial temperature and the preset maximum temperature of the coolant in the immersion power modules.

[0038] In one possible implementation, this embodiment may first group multiple immersion power modules, and the grouping strategy may include a solid-state grouping strategy and a dynamic grouping strategy.

[0039] Please see Figure 6 , Figure 6 This is a schematic diagram of a solid-state grouping strategy for heat dissipation provided in an embodiment of this application. M represents the number of immersion power modules in each module group, and M is a constant greater than or equal to 1. (S1i / S1o), (S2i / S2o), and (S3i / S3o) represent several switch groups. Specifically, during the factory design of the liquid-cooled charging system, M immersion power modules can be sequentially controlled by a switch group according to their arrangement order, thereby achieving solid-state grouping. It can be understood that each module group includes one or more power modules that share a set of circulation pipelines and are controlled by a set of switches.

[0040] Please see Figure 7 , Figure 7 This is a schematic diagram of a dynamic grouping strategy according to an embodiment of this application. Each immersion power module corresponds to a switch. Specifically, at least one immersion power module in the working state is grouped according to its operating power. For example, in response to a charging command, the L power modules currently at full power output are determined as the first group, the L power modules at lower power levels are determined as the second group, and so on. It should be noted that when a new immersion power module enters the working state, the immersion power modules are regrouped according to their operating power.

[0041] For example, taking a liquid-cooled charging system as an example, the liquid-cooled charging system includes 18 immersion power modules with a maximum output power of 40kW. In this embodiment, the 18 immersion power modules can be grouped according to their real-time charging power levels. For example, immersion power modules with a real-time operating power of 40kW can be grouped into groups of 3, immersion power modules with a real-time operating power between 20-39kW can be grouped into groups of 3, and immersion power modules with a real-time operating power between 1-19kW can be grouped into groups of 3, and so on, according to their power levels.

[0042] It should be noted that by utilizing the high heat capacity and slow heating characteristics of the immersion cooling medium, one or more modules can be controlled to circulate heat dissipation at the same time. That is, each power module is cooled in a time-sharing manner, so that the oil pump and cooling fan of the system's cold source operate within a fixed speed range. This prevents the cold source system from failing due to sudden loading and unloading, and reduces the capacity requirements of the liquid cooling circulation system.

[0043] In one possible implementation, where each module group is obtained based on a solid-state grouping strategy, step S520 may specifically include: S521. Determine the heat dissipation time for each module group that meets the preset conditions; S522. Starting from the first time period, the switches corresponding to each module group are controlled to close sequentially according to the preset heat dissipation sequence during the heat dissipation time of each module group, so that the external cold source can dissipate heat to the corresponding module group. S523. Execute the heat dissipation process in each module group repeatedly until all module groups that meet the preset conditions have completed heat dissipation.

[0044] In one possible implementation, with Figure 6 For an example of the liquid-cooled charging system shown, please refer to the following: Figure 6 The liquid-cooled charging system includes N immersion power modules, each with a maximum output power of Pm. The method for determining the heat dissipation time of each module group based on this maximum output power is explained in detail below.

[0045] First, the power loss Pl of each immersion power module is determined based on the maximum output power Pm of each immersion power module. Thus, the heat contribution W of a single immersion power module can be determined based on formula (1).

[0046]

[0047] Where Δt is the maximum working time; Furthermore, the heat Q absorbed by the pre-set mass of coolant in the immersion power module can be determined based on formula (2).

[0048]

[0049] Where Q is the heat absorbed by the preset mass of coolant, C is the heat capacity of the coolant, m is the preset mass of coolant in the submerged power module, and ΔT is the temperature difference after heat absorption. Ta is the preset maximum temperature of the coolant, and T0 is the initial temperature of the coolant. It should be noted that Ta is a fixed temperature that can be initially set according to the properties of the coolant; T0 can be detected by the temperature detection unit at the cold source inlet of the immersion power module and provided to the central control unit.

[0050] Furthermore, the heat contributed by each module group to the outside world and the heat absorbed by the coolant should be equal, that is, make Where M represents the number of immersion power modules in the module group.

[0051] Therefore, the maximum working time can be determined using formula (3):

[0052] Furthermore, the heat dissipation time of each module group that meets the preset conditions is determined based on the maximum working time.

[0053] Specifically, when N is divisible by M, and the output power of the liquid-cooled charging system is less than or equal to M*Pm, the system operates a group of modules. Starting from the first time period, the corresponding switch group of the module group is controlled to close, and the external cold source continuously circulates heat dissipation and cooling to the module group that meets the preset conditions until the heat dissipation of the module is completed. When the output power of the liquid-cooled charging system is greater than M*Pm and less than or equal to 2M*Pm, and the system operates with two groups of modules, the heat dissipation time for each group of modules is as follows: Starting from the first time period, the switches corresponding to the two module groups are controlled to close sequentially according to the preset heat dissipation sequence within their heat dissipation time, so that the external cold source can dissipate heat to the corresponding module groups. The heat dissipation process of the two module groups is executed in a loop until the heat dissipation of the two module groups that meet the preset conditions is completed. When the output power of the liquid-cooled charging system is greater than 2 Mp and less than or equal to 3 Mp, and the system operates with three modules, the heat dissipation time for each module group is as follows: Starting from the first time period, the switches corresponding to the three module groups are closed sequentially according to the preset heat dissipation sequence during their heat dissipation time, so that the external cold source dissipates heat to the corresponding module groups. The heat dissipation process of the three module groups is executed in a loop until the heat dissipation of the three module groups that meet the preset conditions is completed. Similarly, when all modules in the system are working simultaneously, the heat dissipation time for each module is... Starting from the first time period, the switches corresponding to each module group are controlled to close in sequence according to the preset heat dissipation order within their heat dissipation time, so that the external cold source dissipates heat to the corresponding module group. The heat dissipation process of each module group is executed in a loop until the heat dissipation of each module group that meets the preset conditions is completed.

[0054] When N is not divisible by M, the excess immersion power modules are grouped together, meaning the system includes... When the output power of the liquid-cooled charging system is less than or equal to M*Pm, the system operates one module. Starting from the first time period, the corresponding switch group of the module group is closed, and the external cold source continuously circulates heat dissipation and cooling to the module group that meets the preset conditions until the module heat dissipation is completed. When the output power of the liquid-cooled charging system is greater than M*Pm and less than or equal to 2M*Pm, and the system operates with two groups of modules, the heat dissipation time for each group of modules is as follows: Starting from the first time period, the switches corresponding to the two module groups are controlled to close sequentially according to the preset heat dissipation sequence within their heat dissipation time, so that the external cold source can dissipate heat to the corresponding module groups. The heat dissipation process of the two module groups is executed in a loop until the heat dissipation of the two module groups that meet the preset conditions is completed. When the output power of the liquid-cooled charging system is greater than 2 Mp and less than or equal to 3 Mp, and the system operates with three modules, the heat dissipation time for each module group is as follows: Starting from the first time period, the switches corresponding to the three module groups are closed sequentially according to the preset heat dissipation sequence during their heat dissipation time, so that the external cold source dissipates heat to the corresponding module groups. The heat dissipation process of the three module groups is executed in a loop until the heat dissipation of the three module groups that meet the preset conditions is completed. Similarly, when all modules in the system are working simultaneously, the heat dissipation time for each module is... Starting from the first time period, the switches corresponding to each module group are controlled to close in sequence according to the preset heat dissipation order within their heat dissipation time, so that the external cold source dissipates heat to the corresponding module group. The heat dissipation process of each module group is executed in a loop until the heat dissipation of each module group that meets the preset conditions is completed.

[0055] For example, please refer to Figure 7 , Figure 7 This is a schematic diagram of grouped heat dissipation in a 720kW liquid-cooled charging system provided in an embodiment of this application. Figure 7 The system comprises 18 40kW immersion power modules. Three immersion power modules are grouped together to form six module groups, labeled S1 to S6. (S1i / S1o), (S2i / S2o), (S3i / S3o), (S4i / S4o), (S5i / S5o), and (S6i / S6o) are six switch groups, designated as switch group 1, switch group 2, ..., switch group 6. One end of switch group 1 is connected to switch group S1, and the other end is connected to an external cold source; one end of switch group 2 is connected to switch group S2, and the other end is connected to an external cold source, and so on. The heat dissipation time for each module group is... .

[0056] Please continue to refer to this. Figure 7In this example, the preset heat dissipation sequence is from group S1 to group S6. Starting from the first heat dissipation time, the first switch group is closed and the second to sixth switch groups are opened to allow the external cold source to dissipate heat from the power modules in group S1. During the second heat dissipation time, the second switch group is closed and the first, third and sixth switch groups are opened, and so on, until each module group has completed heat dissipation.

[0057] In one possible implementation, where each module group is obtained based on a dynamic grouping strategy, step S520 may specifically include: S524. Determine the heat dissipation sequence of each module group based on the operating power of the immersion power module in each module group that meets the preset conditions. S525. Determine the heat dissipation time for each module group that meets the preset conditions; S526. Starting from the first time period, the switches corresponding to each module group are closed sequentially according to the heat dissipation sequence during the heat dissipation time of each module group, so that the external cold source can dissipate heat to the corresponding module group. S527. Execute the heat dissipation process of each module group in a loop until all module groups that meet the preset conditions have completed heat dissipation.

[0058] Please see Figure 8 , Figure 8 This is a schematic diagram of a dynamic grouping strategy for heat dissipation provided in an embodiment of this application. In one possible implementation, the heat dissipation sequence of each module group is determined based on the order of the operating power of the immersion power modules in each module group from largest to smallest, provided that the preset conditions are met.

[0059] For example, taking a liquid-cooled charging system as an example, this liquid-cooled charging system includes 18 charging modules with a maximum output power of 40kW. In this embodiment, the 6 modules with an actual operating power of 40kW are grouped into groups of 3, denoted as the first module group and the second module group; the 6 modules with an actual operating power between 20-39kW are grouped into groups of 3 according to their actual operating power from largest to smallest, denoted as the third module group and the fourth module group; the modules with an actual operating power between 1-19kW are grouped into groups of 3 according to their actual operating power from largest to smallest, denoted as the fifth module group and the sixth module group. In this charging system, the heat dissipation sequence of each module group is the first module group, the second module group, the third module group, the fourth module group, the fifth module group, and the sixth module group.

[0060] It should be noted that determining the heat dissipation sequence based on the decreasing operating power of the immersion power modules ensures that high-power modules receive priority cooling, thereby reducing power loss and failure risks caused by high temperatures. Furthermore, this method of determining the heat dissipation sequence aligns with the actual heat dissipation requirements of liquid-cooled charging systems during operation, contributing to improved system stability and reliability.

[0061] Furthermore, by calculating the heat dissipation time of the first module group and the second module group, it can be understood that the heat dissipation time of the first module group and the second module group is the same, which is the maximum working time.

[0062] In one embodiment, the heat dissipation time for the third module group, the fourth module group, the fifth module group, and the sixth module group is set to the maximum working time.

[0063] In another embodiment, taking the third module group as an example, the actual power loss of the third module group can be determined based on the actual operating power of the immersion power modules in the third module group. Referring to the calculation process of the maximum working time, the power loss P1 of each immersion power module in the calculation formula of the maximum working time is replaced with the actual power loss of the third module group to obtain the heat dissipation time of the third module group.

[0064] It should be noted that setting the heat dissipation time for each module group based on its actual power allows for more precise control of the heat dissipation process, preventing overheating or underheating. For example, during the initial startup of the liquid-cooled charging system or when the load is light, the system may only require heat dissipation from some module groups. In this case, the corresponding switch groups can be closed according to actual needs, so that the external cold source only dissipates heat from these module groups, thereby saving energy and improving system efficiency.

[0065] Furthermore, starting from the first time period, the switches corresponding to each module group are closed sequentially according to the heat dissipation sequence during the heat dissipation time of each module group, so that the external cold source can dissipate heat to the corresponding module group; the heat dissipation process of each module group is executed cyclically until all module groups that meet the preset conditions have completed heat dissipation.

[0066] It should be noted that the inlet and outlet ports of the immersion power module adopt a specially designed anti-reverse structure, which can effectively prevent the backflow of insulating coolant and ensure unidirectional circulation.

[0067] In one possible implementation, the switch group includes at least one set of switches. It is understood that the case with two switches can be as shown in the above embodiment. The two switches are a first switch and a second switch. The first switch is connected to the cold source inlet and the external cold source outlet of the immersion power module, respectively; the second switch is connected to the cold source outlet and the external cold source inlet of the immersion power module, respectively.

[0068] Please see Figure 9 , Figure 9 This is a schematic diagram of a solid-state grouping strategy with one switch in a switch group, as provided in an embodiment of this application. Each switch group is connected to the liquid inlet of the immersion power module and the outlet of the external cold source. It should be noted that... Figure 9 for Figure 6 The preferred embodiment, Figure 9 The embodiments shown are only applicable to Figure 6 The illustrated embodiment improves the number of switch groups. By reducing the number of switches, system costs can be reduced, while system downtime due to switch failures can be minimized. Figure 9 In the embodiment shown, each module group is connected to an external cold source via only one switch. This design simplifies the system structure and improves the system's reliability.

[0069] It should be noted that this grouped heat dissipation mechanism ensures that the power devices always operate within their optimal temperature range and enables efficient recycling of the insulating coolant, significantly improving the heat dissipation efficiency and operational reliability of the charging system. Furthermore, the entire process is automated through a controller, which can dynamically adjust the grouping status of the power modules and the circulation time of the insulating coolant according to actual operating conditions.

[0070] Figure 10 This is a schematic diagram of another immersion liquid-cooled charging system provided in the embodiments of this application. The charging system includes at least two charging modules 110, a controller 130, a power distribution device 140, and at least one charging interface 120.

[0071] The power distribution device 140 is connected to the controller 130, each charging module 110 and each charging interface 120 respectively. The charging module 110 is used to convert AC power from the power grid into DC power and supply it to the charging interface; The controller 130 is used to obtain the power demand of each charging interface 120 and generate scheduling instructions according to the connection relationship of the controllable switches in the power distribution device 140 and the power demand; the controller 130 is also used to perform heat dissipation control of the charging system based on the above control method. The power distribution device 140 is used to control the opening or closing of the controllable switch according to the scheduling command, so as to distribute the output power of each charging module to each charging interface 120.

[0072] In one optional implementation, the charging system provided in this application is an integrated DC charging pile, with the charging interface 120 used to connect the charging gun, and the charging gun being hung on the host of the charging system via the gun holder on the main body of the charging system.

[0073] In one optional implementation, the charging system provided in this application is a split-type DC charging pile. The charging system also includes multiple charging terminals. The charging interface 120 is used to connect the charging terminals. The charging terminals are set separately from the main body of the charging system. The charging terminals are equipped with a single charging gun or dual charging guns for outputting power to electric vehicles.

[0074] Based on the above embodiments, this application also provides a controller. Figure 11 This is a schematic diagram of the physical structure of a controller provided in an embodiment of this application, as shown below. Figure 11 As shown, the controller may include a processor 1110, a communications interface 1120, a memory 1130, and a communication bus 1140. The processor 1110, communications interface 1120, and memory 1130 communicate with each other via the communication bus 1140. The processor 1110 can call logic instructions in the memory 1130 to execute the control methods of the liquid-cooled charging system provided by the above methods.

[0075] Furthermore, the logical instructions in the aforementioned memory 1130 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0076] Based on the above embodiments, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute the control method of the liquid-cooled charging system provided by the above methods.

[0077] Based on the above embodiments, in another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the control method of the liquid-cooled charging system provided by the above methods.

[0078] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units 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 achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0079] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0080] 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A control method of a liquid-cooled charging system, characterized by, The liquid-cooled charging system comprises a plurality of immersed power modules, a plurality of switch groups, and a controller, each immersed power module is connected with an external cold source through a corresponding switch group, the plurality of switch groups are further connected with the controller, the method is executed by the controller, and the method comprises: In response to a charging instruction, at least one module group meeting a preset condition is determined, the module group comprises at least one immersed power module, wherein the preset condition is that the module group comprises at least one immersed power module in a working state; The switch group corresponding to the at least one module group is controlled to be closed, so that the external cold source cools the corresponding module group.

2. The method of claim 1, wherein, The module group meeting the preset condition is N, N is a constant greater than or equal to 2, and the switch group corresponding to the at least one module group is controlled to be closed, so that the external cold source cools the corresponding module group. The cooling time of each module group meeting the preset condition is determined, and the N module groups meeting the preset condition are sequentially and time-cyclically cooled by controlling the switch groups to be closed according to the cooling time and a preset cooling sequence.

3. The method of claim 2, wherein, In the case that the module groups are obtained based on a solid-state grouping strategy, the N module groups meeting the preset condition are sequentially and time-cyclically cooled by controlling the switch groups to be closed according to the cooling time and a preset cooling sequence, comprising: The cooling time of each module group meeting the preset condition is determined; From the start of the first time period, the switch groups corresponding to the module groups are sequentially controlled to be closed in the cooling time of the module groups according to the preset cooling sequence, so that the external cold source cools the corresponding module groups; The cooling process of the module groups is cyclically executed until all the module groups meeting the preset condition are cooled.

4. The method of claim 2, wherein, In the case that the module groups are obtained based on a dynamic grouping strategy, the N module groups meeting the preset condition are sequentially and time-cyclically cooled by controlling the switch groups to be closed according to the cooling time and a preset cooling sequence, comprising: The cooling sequence of the module groups is determined based on the operating power of the immersed power modules in the module groups meeting the preset condition; The cooling time of each module group meeting the preset condition is determined; From the start of the first time period, the switch groups corresponding to the module groups are sequentially controlled to be closed in the cooling time of the module groups according to the cooling sequence, so that the external cold source cools the corresponding module groups; The cooling process of the module groups is cyclically executed until all the module groups meeting the preset condition are cooled.

5. The method of claim 2, wherein, The cooling time of each module group meeting the preset condition is determined, comprising: The maximum working time is determined based on the number of immersed power modules in a module group, the maximum output power of the immersed power modules, and the time difference of the cooling liquid of a preset mass in the immersed power module from an initial temperature to a preset highest temperature; The cooling time of each module group meeting the preset condition is determined based on the maximum working time.

6. The method of claim 5, wherein, In the case that the module groups are obtained based on a dynamic grouping strategy, the cooling time of each module group meeting the preset condition is determined, comprising: For any module group meeting the preset condition, the heat dissipation time of the module group is determined based on the number of the immersed power modules in the module group, the actual operating power of the immersed power modules in the module group, and the time difference from the initial temperature to the preset highest temperature of the preset quality of the insulation coolant in the immersed power modules; or the heat dissipation time of each module group is the maximum operating time.

7. The method of claim 5, wherein, In the case that the module groups are obtained based on the solid-state grouping strategy, the heat dissipation time of each module group is the same.

8. The method of claim 1, wherein, In the case that the module groups are obtained based on the dynamic grouping strategy, if there is a new immersed power module entering the working state, each immersed power module is re-grouped according to the operating power.

9. The method of claim 1, wherein, The number of switches included in each switch group is at least one. In the case that the number of switches included in each switch group is one, each switch group is connected with the cold source inlet end of the immersed power module and the external cold source outlet end, respectively. In the case that the number of switches included in each switch group is two, the switches are a first switch and a second switch, the first switch is connected with the cold source inlet end of the immersed power module and the external cold source outlet end, respectively, and the second switch is connected with the cold source outlet end of the immersed power module and the external cold source inlet end, respectively.

10. A charging system, characterized by Comprising: Comprising at least two charging modules, a controller, a power distribution device, and at least one charging interface; Wherein, the power distribution device is connected with the controller, each charging module, and each charging interface, respectively; The charging module is used to convert the alternating current of the power grid into direct current and provide it to the charging interface; The controller is used to obtain the demand power of each charging interface, and generate a scheduling instruction according to the connection relationship of the controllable switch in the power distribution device and each demand power; the controller is also used to perform heat dissipation control on the charging system based on the method of any one of claims 1 to 9; The power distribution device is used to control the opening or closing of the controllable switch according to the scheduling instruction, so as to distribute the output power of each charging module to each charging interface.

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