Cooling liquid filling and exhausting control method and device, thermal management system and storage medium

Abstract

The embodiment of the invention provides a cooling liquid filling and exhausting control method and device, a heat management system and a storage medium, and relates to the technical field of heat management. According to the cooling liquid filling and exhausting method, the multi-way valve group can be controlled to be switched to the first conduction state, so that the electric drive heat management branch is convenient to exhaust and inject cooling liquid; the multi-way valve group can be controlled to be switched to a second conduction state, so that local air release of the electric drive heat management branch and local air release of the battery heat management branch are facilitated; and the multi-way valve group can be controlled to be switched to a third conduction state, so that the electric drive heat management branch and the battery heat management branch can exhaust and inject cooling liquid. On the basis of the cooling liquid filling and exhausting control method provided by the invention, filling and exhausting are carried out at the same time, so that the problem that the cooling effect is influenced by residual redundant air is avoided, overheating of a battery or an electric drive is avoided, and the performance and safety of a vehicle are ensured.

Description

Technical Field

[0001] This invention relates to the field of thermal management technology, and more specifically, to a method, apparatus, thermal management system, and storage medium for controlling coolant filling and venting. Background Technology

[0002] Currently, automotive assembly plants use a vacuum filling method to add coolant to the cooling circuit of the thermal management system during vehicle assembly. This process effectively removes air from the cooling circuit, ensuring the coolant level is at the theoretical value, thus enabling the cooling system to operate normally. In after-sales repairs or coolant replacements, due to the lack of vacuum equipment, coolant is typically poured in under natural conditions. Subsequently, during actual road tests, driving maneuvers help to expel air from the cooling circuit.

[0003] However, this method cannot effectively remove air from the cooling circuit, resulting in an actual coolant charge being lower than the theoretical value, with excess air remaining in the cooling circuit. This excess air can cause the cooling system to malfunction during actual vehicle use, leading to problems such as battery or electric drive overheating, ultimately affecting vehicle performance and safety. Summary of the Invention

[0004] The present invention aims to provide a method, device, thermal management system, and storage medium for controlling coolant filling and venting, which enables simultaneous filling and venting of coolant, avoiding the problem of residual excess air affecting the cooling effect, preventing overheating of the battery or electric drive, and ensuring the performance and safety of the vehicle.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, the present invention provides a coolant filling and venting control method applied to a thermal management system. The thermal management system includes a battery thermal management branch, an electric drive thermal management branch, and a multi-way valve group. The multi-way valve group is used to control the connection state of the battery thermal management branch and the electric drive thermal management branch. The method includes:

[0007] The control multi-way valve group is switched to the first conduction state, so that the battery thermal management branch and the electric drive thermal management branch enter parallel mode; wherein, the parallel mode is used for the electric drive thermal management branch to exhaust and inject coolant;

[0008] After a first preset time period, the control multi-way valve group is switched to the second conduction state, so that the battery thermal management branch and the electric drive thermal management branch enter the first series mode; wherein, the first series mode is used for local air release in the electric drive thermal management branch and local air release in the battery thermal management branch.

[0009] After a second preset time period, the control multi-way valve group switches to the third conduction state, so that the battery thermal management branch and the electric drive thermal management branch enter the second series mode; wherein, the second series mode is used for the electric drive thermal management branch and the battery thermal management branch to exhaust and inject coolant.

[0010] In an optional embodiment, the battery thermal management branch includes a battery pack cooling flow path, a battery water pump, a battery-side heater, and a battery cooler connected in series. The electric drive thermal management branch includes an electric drive assembly cooling flow path, a low-temperature radiator, an expansion tank, and an electric drive water pump connected in series. The thermal management system also includes a first pipeline and a second pipeline, wherein the first pipeline is the pipeline between the battery cooler and the battery pack cooling flow path, and the second pipeline is the pipeline between the electric drive assembly cooling flow path and the low-temperature radiator. A multi-way valve group is disposed between the battery thermal management branch and the electric drive thermal management branch, and is disposed between the first pipeline and the second pipeline.

[0011] The steps for controlling the multi-way valve group to switch to the first conducting state, so that the battery thermal management branch and the electric drive thermal management branch enter parallel mode, include:

[0012] The control multi-way valve group connects the expansion tank and the electric drive water pump, and also connects the battery pack cooling flow path and the battery water pump, so that the battery thermal management branch and the electric drive thermal management branch are connected in parallel.

[0013] In an optional implementation, the step of controlling the multi-way valve group to switch to the second conducting state, so that the battery thermal management branch and the electric drive thermal management branch enter the first series mode, includes:

[0014] The control multi-way valve group connects the electric drive water pump and the first pipeline, and also connects the battery water pump and the second pipeline, so that the battery side heater, battery cooler, electric drive water pump, electric drive assembly cooling flow path and battery water pump are connected in series.

[0015] In an optional implementation, the step of controlling the multi-way valve group to switch to the third conducting state, so that the battery thermal management branch and the electric drive thermal management branch enter the second series mode, includes:

[0016] The control multi-way valve group connects the expansion tank and the battery water pump, and also connects the battery pack cooling flow path and the electric drive water pump, so that the expansion tank, battery water pump, battery side heater, battery cooler, battery pack cooling flow path, electric drive water pump, electric drive assembly cooling flow path and low temperature radiator are connected in series.

[0017] In an optional implementation, while controlling the multi-way valve group to switch to the first conducting state, the electric water pump is also controlled to rotate, and the battery water pump is controlled to stop rotating.

[0018] While controlling the multi-way valve group to switch to the second conduction state, it also controls the rotation of the electric water pump and the battery water pump.

[0019] While controlling the multi-way valve group to switch to the third conduction state, it also controls the rotation of the electric water pump and the battery water pump.

[0020] In an optional implementation, after the step of controlling the multi-way valve group to switch to the first conducting state, causing the battery thermal management branch and the electric drive thermal management branch to enter parallel mode, and before the step of controlling the multi-way valve group to switch to the second conducting state, causing the battery thermal management branch and the electric drive thermal management branch to enter the first series mode, the method further includes:

[0021] After the third preset time period, the control multi-way valve group is switched to the third conduction state, so that the battery thermal management branch and the electric drive thermal management branch enter the second series mode.

[0022] In an optional implementation, after the step of controlling the multi-way valve group to switch to the third conducting state, causing the battery thermal management branch and the electric drive thermal management branch to enter the second series mode, and before the step of controlling the multi-way valve group to switch to the second conducting state, causing the battery thermal management branch and the electric drive thermal management branch to enter the first series mode, the method further includes:

[0023] After the fourth preset time period, the control multi-way valve group is switched to the first conduction state, so that the battery thermal management branch and the electric drive thermal management branch enter parallel mode.

[0024] In an optional implementation, after the step of controlling the multi-way valve group to switch to the first conducting state, causing the battery thermal management branch and the electric drive thermal management branch to enter parallel mode, and before the step of controlling the multi-way valve group to switch to the second conducting state, causing the battery thermal management branch and the electric drive thermal management branch to enter the first series mode, the method further includes:

[0025] After the fifth preset time period, the control multi-way valve group is switched to the third conduction state, so that the battery thermal management branch and the electric drive thermal management branch enter the second series mode.

[0026] In an optional implementation, it further includes:

[0027] Determine if project configuration information exists;

[0028] If no project configuration information is available, the control multi-way valve group is switched to the fourth conduction state, so that the battery thermal management branch and the electric drive thermal management branch enter the fully connected mode, so that coolant can be added after the thermal management system is evacuated.

[0029] If project configuration information exists, the step of "controlling the multi-way valve group to switch to the first conduction state, so that the battery thermal management branch and the electric drive thermal management branch enter parallel mode" is executed to vent the thermal management system and add coolant.

[0030] In an optional implementation, the step of controlling the multi-way valve group to switch to the fourth conducting state, so that the battery thermal management branch and the electric drive thermal management branch enter the fully connected mode, includes:

[0031] The control multi-way valve group connects the expansion tank and the battery water pump, and also connects the battery pack cooling flow path and the electric drive water pump, and connects the first pipeline and the second pipeline, so that the battery cooler, battery side heater, battery water pump, expansion tank and low temperature radiator are connected in series, and the electric drive assembly cooling flow path, electric drive water pump and battery pack cooling flow path are connected in series, and the expansion tank, battery water pump, battery side heater, battery cooler, battery pack cooling flow path, electric drive water pump, electric drive assembly cooling flow path and low temperature radiator are connected in series.

[0032] In an optional implementation, while controlling the multi-way valve group to switch to the fourth conduction state, the battery water pump is also controlled to stop rotating, and the electric water pump is controlled to stop rotating.

[0033] In an optional implementation, before the step of controlling the multi-way valve group to switch to the first conducting state, causing the battery thermal management branch and the electric drive thermal management branch to enter parallel mode, the method further includes:

[0034] Obtain diagnostic instructions while the vehicle is stationary;

[0035] Based on the diagnostic instructions, diagnose whether the vehicle condition allows for coolant filling and venting, and determine whether the diagnostic results are correct;

[0036] If the diagnosis is correct, then execute the step of "controlling the multi-way valve group to switch to the first conduction state, so that the battery thermal management branch and the electric drive thermal management branch enter parallel mode".

[0037] In an optional implementation, the stationary state represents the vehicle simultaneously satisfying the following conditions:

[0038] The vehicle is powered on;

[0039] The gear is in P (Park) position;

[0040] The front hood is open;

[0041] The vehicle speed is zero; and,

[0042] The voltage of the small battery is within the normal range.

[0043] In an optional implementation, after the step of controlling the multi-way valve group to switch to the first conducting state, causing the battery thermal management branch and the electric drive thermal management branch to enter parallel mode, the method further includes:

[0044] After the sixth preset duration, the control button flashes and then remains off, controlling the multi-way valve group to ensure that the battery thermal management branch and the electric drive thermal management branch are at least partially connected in parallel or at least partially connected in series.

[0045] Secondly, the present invention provides a coolant filling and venting control device applied to a thermal management system. The thermal management system includes a battery thermal management branch, an electric drive thermal management branch, and a multi-way valve group. The multi-way valve group is used to control the connection state of the battery thermal management branch and the electric drive thermal management branch, including:

[0046] The first control module is used to control the multi-way valve group to switch to the first conduction state, so that the battery thermal management branch and the electric drive thermal management branch enter the parallel mode; wherein, the parallel mode is used for the electric drive thermal management branch to exhaust and inject coolant.

[0047] The second control module is used to control the multi-way valve group to switch to the second conduction state after a first preset time period, so that the battery thermal management branch and the electric drive thermal management branch enter the first series mode; wherein, the first series mode is used for local air release in the electric drive thermal management branch and local air release in the battery thermal management branch.

[0048] The third control module is used to control the multi-way valve group to switch to the third conduction state after the second preset time period, so that the battery thermal management branch and the electric drive thermal management branch enter the second series mode; wherein, the second series mode is used for the electric drive thermal management branch and the battery thermal management branch to exhaust and inject coolant.

[0049] Thirdly, the present invention provides a thermal management system, comprising: one or more processors and a memory; the memory for storing computer program code, the computer program code including a computer program; when one or more processors execute the computer program, the processors perform a coolant filling and venting control method as described in any of the foregoing embodiments.

[0050] Fourthly, the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the coolant filling and venting control method as described in any of the foregoing embodiments.

[0051] The beneficial effects of the coolant filling and venting control method, apparatus, thermal management system, and computer-readable storage medium provided in the embodiments of the present invention include:

[0052] This invention provides a coolant filling and venting control method, apparatus, thermal management system, and computer-readable storage medium, applicable to aftermarket applications. The coolant filling and venting method can control a multi-way valve group to switch to a first conducting state to allow venting and coolant injection into the electric drive thermal management branch; it can control the multi-way valve group to switch to a second conducting state to allow partial air release from the electric drive thermal management branch and the battery thermal management branch; and it can control the multi-way valve group to switch to a third conducting state to allow venting and coolant injection into both the electric drive thermal management branch and the battery thermal management branch. Based on the above, the coolant filling and venting control method provided in this application achieves simultaneous filling and venting, thereby avoiding the problem of residual excess air affecting the cooling effect, preventing overheating of the battery or electric drive, and ensuring vehicle performance and safety. Attached Figure Description

[0053] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 This is a schematic block diagram of the thermal management system provided in this embodiment;

[0055] Figure 2 This is a schematic diagram of the structure of the coolant filling and venting control method provided in this embodiment;

[0056] Figure 3 This is a schematic diagram of the thermal management system provided in this embodiment;

[0057] Figure 4 This is a schematic diagram showing the thermal management system provided in this embodiment in parallel mode;

[0058] Figure 5 This is a schematic diagram showing the thermal management system provided in this embodiment in the first series mode;

[0059] Figure 6 This is a schematic diagram showing the thermal management system provided in this embodiment in the second series mode;

[0060] Figure 7 This is a schematic diagram showing the thermal management system provided in this embodiment in a fully connected mode;

[0061] Figure 8 This is a schematic block diagram of the coolant filling and venting control device provided in this embodiment.

[0062] Icons: 10-Thermal Management System; 110-Memory; 120-Processor; 20-Coolant Filling and Venting Control Device; 210-First Control Module; 220-Second Control Module; 230-Third Control Module; 100-Battery Thermal Management Branch; 101-Battery Pack Cooling Flow Path; 102-Battery Water Pump; 103-Battery Cooler; 104-Battery Side Heater; 105-Cooler Outlet Water Temperature Sensor; 200-Electric Drive Thermal Management Branch; 201-Electric Drive Assembly Cooling Flow Path; 202-Low Temperature Radiator; 203-Expansion Tank; 204-Electric Drive Water Pump; 205-Electric Drive Outlet Water Temperature Sensor; 300-Multi-way Valve Assembly; 501-First Pipeline; 503-Second Pipeline. Detailed Implementation

[0063] The after-sales coolant filling and venting control methods in related technologies cannot effectively remove air from the cooling circuit, resulting in the actual coolant filling amount being lower than the theoretical value. Excess air still exists in the cooling circuit, causing the cooling system to malfunction during actual vehicle use, which in turn leads to problems such as battery or electric drive overheating, affecting vehicle performance and safety.

[0064] To address the aforementioned problems, this invention provides a coolant filling and venting control method, device, thermal management system 10, and storage medium. These methods improve upon current coolant filling and venting control methods by enabling simultaneous filling and venting, thereby preventing the cooling effect from being affected by excess air residue, avoiding overheating of the battery or electric drive, and ensuring vehicle performance and safety.

[0065] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0066] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0067] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0068] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0069] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0070] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0071] Please see Figure 1 This invention provides a coolant filling and venting control method and a coolant filling and venting control device 20, applied to a thermal management system 10. The thermal management system 10 can be a new energy vehicle thermal management system 10, which may include a battery thermal management branch 100, an electric drive thermal management branch 200, and a multi-way valve group 300. The multi-way valve group 300 is used to control the connection state between the battery thermal management branch 100 and the electric drive thermal management branch 200. Additionally, the thermal management system 10 may also include a memory 110 and one or more processors 120.

[0072] The memory 110 and processor 120 are electrically connected directly or indirectly to enable data transmission or interaction. For example, these components can be electrically connected to each other via one or more communication buses or signal lines. The coolant filling and venting control device 20 includes at least one software function module that can be stored in the memory 110 or embedded in the operating system (OS) of a server in the form of software or firmware. The processor 120 is used to execute the executable modules stored in the memory 110, such as the software function modules and computer programs included in the coolant filling and venting control device 20.

[0073] The memory 110 may be, but is not limited to, random access memory (RAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), etc. The memory 110 stores computer program code, which includes computer instructions. When one or more processors 120 execute the computer instructions, the processors 120 perform the coolant filling and venting control method.

[0074] The following uses the thermal management system 10 as an example of a new energy vehicle thermal management system 10 to explain the coolant filling and venting control method and the coolant filling and venting control device 20 in detail.

[0075] Please see Figure 2 The coolant filling and venting control method provided in this embodiment may include the following steps:

[0076] In step S410, the multi-way valve group 300 is switched to the first conducting state, so that the battery thermal management branch 100 and the electric drive thermal management branch 200 enter the parallel mode; wherein, the parallel mode is used for the electric drive thermal management branch 200 to exhaust and inject coolant.

[0077] In step S410, it is easy to understand that by controlling the multi-way valve group 300 to switch to the first conduction state, the battery thermal management branch 100 and the electric drive thermal management branch 200 enter the parallel mode, thereby making the electric drive thermal management branch 200 and the battery thermal management branch 100 form independent series circuits, so that the electric drive thermal management branch 200 can independently realize exhaust.

[0078] In step S450, after a first preset time, the multi-way valve group 300 is switched to the second conduction state, so that the battery thermal management branch 100 and the electric drive thermal management branch 200 enter the first series mode; wherein, the first series mode is used for local air release of the electric drive thermal management branch 200 and the battery thermal management branch 100.

[0079] In step S450, it is easy to understand that by controlling the multi-way valve group 300 to switch to the second conduction state, the battery thermal management branch 100 and the electric drive thermal management branch 200 enter the first series mode, that is, the battery thermal management branch 100 and the electric drive thermal management branch 200 are partially connected to form a local series circuit, thereby effectively and quickly releasing the air in the short-circuited battery circuit in the battery thermal management branch 100 into the entire circuit.

[0080] In step S460, after a second preset time, the multi-way valve group 300 is switched to the third conduction state, so that the battery thermal management branch 100 and the electric drive thermal management branch 200 enter the second series mode; wherein, the second series mode is used for the electric drive thermal management branch 200 and the battery thermal management branch 100 to exhaust and inject coolant.

[0081] In step S460, it is easy to understand that by controlling the multi-way valve group 300 to switch to the third conduction state, the battery thermal management branch 100 and the electric drive thermal management branch 200 enter the second series mode, so that the battery thermal management branch 100 and the electric drive thermal management branch 200 are connected to form an integral series circuit, thereby releasing the air in the short-circuited battery circuit and the air in the battery thermal management branch 100 in the aforementioned step S450 into the entire series circuit, realizing exhaust.

[0082] It should be noted that in steps S410, S450, and S460 above, it is necessary to ensure that there is sufficient coolant in the battery thermal management branch 100 and the electric drive thermal management branch 200. Therefore, sufficient coolant can be added to the battery thermal management branch 100 and the electric drive thermal management branch 200 before triggering the above coolant filling and venting control method. Furthermore, if the coolant level drops during the venting process, coolant needs to be continuously added until it stops dropping.

[0083] In addition, it should be noted that the technical solution of this embodiment switches the conduction state of the multi-way valve group 300, thereby switching the connection mode of the battery thermal management branch 100 and the electric drive thermal management branch 200, so as to achieve the purpose of venting the thermal management system 10 and adding coolant in stages.

[0084] In step S410, by controlling the electric drive thermal management branch 200 and the battery thermal management branch 100 to operate in parallel, the electric drive thermal management branch 200 independently operates to vent air and add the required coolant. After waiting for step S410 to run for a first preset time (e.g., 60 seconds), in step S450, by controlling the electric drive thermal management branch 200 and the battery thermal management branch 100 to be partially connected in series, a portion of the battery thermal management branch 100 can form a short-circuit battery circuit, releasing air into the circuit. After waiting for step S450 to run for a second preset time (e.g., 30 seconds), by controlling the electric drive thermal management branch 200 and the battery thermal management branch 100 to be connected in series as a whole, the air in the short-circuited battery circuit in the aforementioned step S450 and the air in the battery thermal management branch 100 are both released into the entire series circuit, achieving venting and coolant addition.

[0085] It is readily understood that the sequential execution of the above steps facilitates the orderly venting and coolant filling of the thermal management system 10. Accordingly, the coolant filling and venting control method provided by this invention improves upon current coolant filling and venting control methods, enabling simultaneous filling and venting, thereby avoiding the problem of residual excess air affecting cooling performance, preventing overheating of the battery or electric drive, and ensuring vehicle performance and safety. Optionally, the above steps can be repeated.

[0086] In some embodiments, please refer to Figure 3 The battery thermal management branch 100 includes a battery pack cooling flow path 101, a battery water pump 102, a battery-side heater 104, and a battery cooler 103 connected in series. The electric drive thermal management branch 200 includes an electric drive assembly cooling flow path 201, a low-temperature radiator 202, an expansion tank 203, and an electric drive water pump 204 connected in series. Optionally, a cooler outlet water temperature sensor 105 is also provided at the outlet of the battery cooler 103, and an electric drive outlet water temperature sensor 205 is also provided at the outlet of the electric drive assembly cooling flow path 201.

[0087] Furthermore, the thermal management system 10 also includes a first pipe 501 and a second pipe 503, wherein the first pipe 501 is the pipe between the battery cooler 103 and the battery pack cooling flow path 101, and the second pipe 503 is the pipe between the electric drive assembly cooling flow path 201 and the low-temperature radiator 202. Based on the above, the multi-way valve assembly 300 is disposed between the battery thermal management branch 100 and the electric drive thermal management branch 200, and is disposed between the first pipe 501 and the second pipe 503.

[0088] It should be noted that during the filling and venting processes, the coolant undergoes gas-liquid separation in the expansion tank. Therefore, in steps S410, S450, and S460, air is discharged through the expansion tank in the electric drive thermal management branch 200. Furthermore, before triggering the coolant filling and venting control method, sufficient coolant can be pre-filled in the expansion tank to ensure adequate coolant in the battery thermal management branch 100 and the electric drive thermal management branch 200, preventing the battery water pump 102 and the electric drive water pump 204 from running dry. After triggering the coolant filling and venting control method, coolant is replenished to the expansion tank promptly by observing the coolant level changes.

[0089] It should also be noted that the rotation duration of the electric water pump 204 and the battery water pump 102 is the preset duration mentioned in the aforementioned steps, and the rotation speed is calibrated according to the relevant evaluation methods in the actual coolant after-sales filling development experiment. Additionally, the multi-way valve assembly 300 can be two five-way valves, three four-way valves, or one six-way valve.

[0090] Taking the multi-way valve group 300 as an example of a six-way valve, the six valve ports of the six-way valve are respectively connected to the inlet of the battery water pump 102, the first pipeline 501 (i.e., the pipeline between the outlet of the battery cooler 103 and the inlet of the battery pack cooling flow path 101), the outlet of the battery pack cooling flow path 101, the inlet of the electric drive water pump 204, the second pipeline 503 (i.e., the pipeline between the outlet of the electric drive assembly cooling flow path 201 and the inlet of the low temperature radiator 202), and the outlet of the expansion tank 203.

[0091] Figures 4 to 6 This is a schematic diagram of the thermal management system 10 provided by the present invention in different modes.

[0092] The bold lines indicate pipes that are currently in operation. Figures 3 to 6 The thermal management system 10 shown has the same structure. The following section combines... Figures 4 to 6 This section provides a detailed explanation of each mode involved in the coolant filling and venting control method.

[0093] Please see Figure 4 Step S410, which controls the multi-way valve group 300 to switch to the first conducting state, so that the battery thermal management branch 100 and the electric drive thermal management branch 200 enter the parallel mode, specifically includes: controlling the multi-way valve group 300 to connect the expansion tank 203 and the electric drive water pump 204, and to connect the battery pack cooling flow path 101 and the battery water pump 102, so that the battery thermal management branch 100 and the electric drive thermal management branch 200 are connected in parallel.

[0094] Based on the above, it can be explained that the valve port u and valve port w are connected, and the valve port z and valve port x are connected. Therefore, the battery pack cooling flow path 101, battery water pump 102, battery side heater 104, and battery cooler 103 are connected in series to form the battery thermal management branch 100, and the electric drive assembly cooling flow path 201, low-temperature radiator 202, expansion tank 203, and electric drive water pump 204 are connected in series to form the electric drive thermal management branch 200. It is easy to understand that the battery thermal management branch 100 and the electric drive thermal management branch 200 are independent of each other, and the air in the electric drive thermal management branch 200 is discharged through the expansion tank 203.

[0095] Accordingly, during the above process, while controlling the multi-way valve group 300 to switch to the first conducting state, the electric water pump 204 is also controlled to rotate, and the battery water pump 102 is controlled to stop rotating. Optionally, the battery water pump 102 rotates at 0% speed, and the electric water pump 204 rotates at 100% speed for 60 seconds to facilitate the discharge of air from the electric thermal management branch 200.

[0096] Please see Figure 5 Step S450, which controls the multi-way valve group 300 to switch to the second conduction state, so that the battery thermal management branch 100 and the electric drive thermal management branch 200 enter the first series mode, specifically includes: controlling the multi-way valve group 300 to connect the electric drive water pump 204 and the first pipeline 501, and to connect the battery water pump 102 and the second pipeline 503, so that the battery side heater 104, battery cooler 103, electric drive water pump 204, electric drive assembly cooling flow path 201 and battery water pump 102 are connected in series.

[0097] Based on the above, it can be explained that the valve port u-valve port y are connected, and the valve port v-valve port x are connected. Therefore, the battery thermal management branch 100 and the electric drive thermal management branch 200 are connected in series to form a short-circuited battery circuit, and the battery pack cooling flow path 101 is bypassed from the coolant flow path of the battery thermal management branch 100, and the low-temperature radiator 202 is bypassed from the coolant flow path of the electric drive thermal management branch 200. It is easy to understand that at this time, the air in the pipe of the short-circuited battery circuit with the shorter coolant flow path can be quickly released into the entire circuit.

[0098] Accordingly, during the above process, while controlling the multi-way valve group 300 to switch to the second conducting state, the electric water pump 204 and the battery water pump 102 are also controlled to rotate. It is easy to understand that in step S450, both the electric water pump 204 and the battery water pump 102 rotate at 100% of their rotational speed for 30 seconds to release the air in the short-circuited battery circuit into the circuit.

[0099] Please see Figure 6Step S460, which controls the multi-way valve group 300 to switch to the third conduction state, so that the battery thermal management branch 100 and the electric drive thermal management branch 200 enter the second series mode, specifically includes: controlling the multi-way valve group 300 to connect the expansion tank 203 and the battery water pump 102, and to connect the battery pack cooling flow path 101 and the electric drive water pump 204, so that the expansion tank 203, the battery water pump 102, the battery side heater 104, the battery cooler 103, the battery pack cooling flow path 101, the electric drive water pump 204, the electric drive assembly cooling flow path 201, and the low temperature radiator 202 are connected in series.

[0100] Based on the above, it can be explained that the valve port u and valve port z of the six-way valve are connected, and the valve port w and valve port x are connected. Therefore, the battery thermal management branch 100 and the electric drive thermal management branch 200 are connected in series to form a large series circuit. The air in the short-circuited battery circuit and the air in the battery thermal management branch 100 are released into the entire series circuit so as to exhaust the air through the expansion tank 203 in the electric drive thermal management branch 200.

[0101] Accordingly, during the above process, while controlling the multi-way valve group 300 to switch to the third conduction state, the electric water pump 204 and the battery water pump 102 are also controlled to rotate. Optionally, in step S460, both the electric water pump 204 and the battery water pump 102 rotate at 100% of their rotational speed for 30 seconds to facilitate the discharge of air from the thermal management system 10.

[0102] After step S410 and before step S450, the method further includes:

[0103] In step S420, after a third preset time period, the multi-way valve group 300 is controlled to switch to the third conduction state, so that the battery thermal management branch 100 and the electric drive thermal management branch 200 enter the second series mode.

[0104] In step S420, it is easy to understand that the second series connection mode here is similar to that in step S460, both referring to the battery thermal management branch 100 and the electric drive thermal management branch 200 being connected in series to form a loop. Based on this, after the air in the electric drive thermal management branch 200 is discharged in step S410, the air in the battery thermal management branch 100 is released into the loop at this time. This air can be discharged through the expansion tank 203 in the electric drive thermal management branch 200.

[0105] Accordingly, during the above process, while controlling the multi-way valve group 300 to switch to the third conduction state, the electric water pump 204 and the battery water pump 102 are also controlled to rotate. It is easy to understand that in step S430, both the electric water pump 204 and the battery water pump 102 rotate at 100% of their speed for 120 seconds to facilitate the discharge of air from the battery thermal management branch 100 that is connected in series to the electric thermal management branch 200.

[0106] After step S420 and before step S450, the method further includes:

[0107] In step S430, after a fourth preset time period, the multi-way valve group 300 is controlled to switch to the first conduction state, so that the battery thermal management branch 100 and the electric drive thermal management branch 200 enter parallel mode.

[0108] In step S430, it is easy to understand that the parallel connection mode here is similar to that in step S410, both referring to the series circuits formed by the battery thermal management branch 100 and the electric drive thermal management branch 200 respectively. Based on this, since the expansion tank 203 is located in the electric drive thermal management branch 200, the air released by the battery thermal management branch 100 in step S420 is discharged through the separately operating electric drive thermal management branch 200.

[0109] Accordingly, during the above process, while controlling the multi-way valve group 300 to switch to the first conducting state, the electric water pump 204 and the battery water pump 102 are also controlled to rotate. It is easy to understand that in step S430, both the electric water pump 204 and the battery water pump 102 rotate at 100% of their speed for 30 seconds to facilitate the discharge of air from the battery thermal management branch 100 that is connected in series to the electric thermal management branch 200.

[0110] After step S430 and before step S450, the method further includes:

[0111] In step S440, after a fifth preset time period, the multi-way valve group 300 is switched to the third conduction state, so that the battery thermal management branch 100 and the electric drive thermal management branch 200 enter the second series mode.

[0112] In step S440, it is easy to understand that the second series connection mode here is similar to that in steps S420 and S460, both referring to the circuit formed by the battery thermal management branch 100 and the electric drive thermal management branch 200 connected in series. Based on this, the air remaining in the battery thermal management branch 100 is released into the entire series circuit and discharged through the expansion tank 203 in the electric drive thermal management branch 200.

[0113] Accordingly, during the above process, while controlling the multi-way valve group 300 to switch to the third conduction state, the electric water pump 204 and the battery water pump 102 are also controlled to rotate. It is easy to understand that in step S440, both the electric water pump 204 and the battery water pump 102 rotate at 100% of their rotational speed for 60 seconds, so as to discharge the remaining air in the battery thermal management branch 100 through the large series circuit.

[0114] It is easy to understand that steps S410 to S460 above are all after-sales venting and filling modes. The above six steps can be repeated three times to more effectively improve the problem of the coolant in the thermal management system 10 not being able to be filled.

[0115] Please refer to it again. Figure 2 The methods also include:

[0116] Step S100: Determine if project configuration information exists.

[0117] In this embodiment, the vehicle can be powered on before step S100, and relevant signals can be collected after the program is woken up.

[0118] In step S100, the after-sales mode and production line mode for adding exhaust gas can be identified based on the 95 configuration file.

[0119] In step S500, if no project configuration information exists, the multi-way valve group 300 is switched to the fourth conduction state, so that the battery thermal management branch 100 and the electric drive thermal management branch 200 enter the fully connected mode, so as to add coolant after the thermal management system 10 is evacuated.

[0120] In step S500, it's easy to understand that the production line mode does not have the project configuration information corresponding to configuration file 95. Therefore, if the project configuration information is missing, the production line filling mode is entered, and the production line filling control strategy is executed. That is, the multi-way valve group 300 switches to the fourth conduction state, causing the battery thermal management branch 100 and the electric drive thermal management branch 200 to enter the fully connected mode. It should be noted that since the battery thermal management branch 100 and the electric drive thermal management branch 200 are in the fully connected mode, coolant filling can be performed directly after the vacuuming and pressure holding operation is completed. During this process, venting is not required to achieve the theoretical value of coolant in the thermal management system 10. Based on this, the production line filling mode is simplified.

[0121] Correspondingly, the after-sales mode configures the project configuration information corresponding to the 95 configuration file. Therefore, if the project configuration information exists, the step of "controlling the multi-way valve group 300 to switch to the first conduction state, so that the battery thermal management branch 100 and the electric drive thermal management branch 200 enter parallel mode" is executed to vent the thermal management system 10 and add coolant.

[0122] It is easy to understand that step S100 is located before step S410 and is a pre-judgment before coolant filling and venting control, which is intended to confirm whether the mode to be executed is after-sales mode or production line mode.

[0123] In this application, please refer to Figure 7The steps of controlling the multi-way valve group 300 to switch to the fourth conduction state, so that the battery thermal management branch 100 and the electric drive thermal management branch 200 enter the fully connected mode include: controlling the multi-way valve group 300 to connect the expansion tank 203 and the battery water pump 102, and to connect the battery pack cooling flow path 101 and the electric drive water pump 204, and to connect the first pipe 501 and the second pipe 503.

[0124] Based on the above connectivity configuration, it can be explained that the six-way valve's port u-port z are connected, its port v-port y are connected, and its port w-port x are connected. The battery cooler 103, battery-side heater 104, battery water pump 102, expansion tank 203, and low-temperature radiator 202 are connected in series to form a loop; the electric drive assembly cooling path 201, electric drive water pump 204, and battery pack cooling path 101 are connected in series to form a loop; the expansion tank 203, battery water pump 102, battery-side heater 104, battery cooler 103, battery pack cooling path 101, electric drive water pump 204, electric drive assembly cooling path 201, and low-temperature radiator 202 are connected in series to form a loop. In other words, in the fully connected mode, there are three coolant loops, simplifying and increasing the coolant filling efficiency.

[0125] Optionally, while controlling the multi-way valve group 300 to switch to the fourth conducting state, the battery water pump 102 and the electric water pump 204 are also controlled to stop rotating. It is easy to understand that when the vacuum level reaches a certain level, controlling the electric water pump 204 and stopping it can prevent the vacuum level from dropping and affecting the exhaust effect.

[0126] Please refer again. Figure 2 Before step S410, that is, before the step of controlling the multi-way valve group 300 to switch to the first conducting state, so that the battery thermal management branch 100 and the electric drive thermal management branch 200 enter parallel mode, the method further includes:

[0127] Step S200: Obtain diagnostic instructions while the vehicle is stationary.

[0128] Before step S200, step S100 can be executed to confirm whether the system is in production line venting mode or after-sales venting mode.

[0129] In step S200, a diagnostic command can be triggered by pressing a button. In some embodiments, the operator can first press the rear defrost button, and then, starting from the moment the rear defrost button is pressed, press the front defrost button eight times consecutively within 10 seconds to trigger the diagnostic command.

[0130] Step S300: Based on the diagnostic command, diagnose whether the vehicle condition can be filled with coolant and vented, and determine whether the diagnostic result is correct.

[0131] It's easy to understand that if the diagnostic result is correct, the step of "controlling the multi-way valve group 300 to switch to the first conducting state, so that the battery thermal management branch 100 and the electric drive thermal management branch 200 enter parallel mode" is executed. A correct diagnostic result is indicated by the front defrost button flashing and then remaining constantly lit. Optionally, the front defrost button flashes 3 times, with each flash lasting 1 second. Conversely, if the diagnostic result is incorrect, the vehicle cannot perform aftermarket coolant filling and venting control, and the operator must also check whether the vehicle meets prerequisite conditions such as being stationary.

[0132] In the embodiments provided in this application, a stationary state represents a vehicle simultaneously meeting the following conditions: the vehicle is powered on, the gear is in P (Park), the hood is open, the vehicle speed is zero, and the battery voltage is within the normal range. It is readily understood that only after meeting the above conditions can a diagnostic command be triggered to determine whether the vehicle's overall condition is suitable for aftermarket coolant bleed / filling. Optionally, the normal range for the battery voltage is 9 to 16V.

[0133] Additionally, after step S410, i.e. after controlling the multi-way valve group 300 to switch to the first conducting state, so that the battery thermal management branch 100 and the electric drive thermal management branch 200 enter parallel mode, the method may also include an exit condition: after a sixth preset time period, controlling the front defrost button to flash and then remain in an off state, controlling the multi-way valve group 300 to make the battery thermal management branch 100 and the electric drive thermal management branch 200 at least partially connected in parallel or at least partially connected in series.

[0134] It should be noted that, similar to the aforementioned, the front defrost button here also flashes 3 times, with each flash lasting 1 second. Afterwards, the front defrost button is in a normally off state, and the thermal management system 10 exits the after-sales filling and venting mode. Furthermore, the multi-way valve group 300 connects the battery thermal management branch 100 and the electric drive thermal management branch 200 at least partially in parallel or at least partially in series. At this time, the battery water pump 102 and the electric drive water pump 204 respond to specific control commands and enter the normal water circuit mode of the thermal management system 10.

[0135] Additionally, it should be noted that after returning the battery to the after-sales refueling and venting mode, the normal operating water circuit mode for the battery thermal management branch 100 and the electric drive thermal management branch 200 can be the parallel mode, the first series mode, or the second series mode mentioned above. It is easy to understand that the parallel mode is mostly used in summer scenarios; the first series mode is mostly used in spring, autumn, and winter scenarios; and the second series mode is mostly used in spring and autumn scenarios. Furthermore, it is possible to switch to other series or parallel modes.

[0136] For example, in Figure 3When the multi-port valve assembly 300 shown is a six-port valve, the valve port u-valve w are connected, and the valve port y-valve x are connected. Based on this, the battery pack cooling flow path 101, battery water pump 102, battery-side heater 104, and battery cooler 103 form independent series circuits, and the electric drive assembly cooling flow path 201 and electric drive water pump 204 form independent series circuits. The electric drive assembly in this operating condition can heat up quickly, making it suitable for winter scenarios.

[0137] Alternatively, the six-way valve can be configured with port u connected to port v and port y connected to port x. Based on this, the battery water pump 102, battery-side heater 104, and battery cooler 103 form independent series circuits, and the electric drive assembly cooling flow path 201 and the electric drive water pump 204 also form independent series circuits. In this case, the battery-side heater 104 can be used to quickly heat the passenger compartment, and the electric drive assembly can also be rapidly heated, typically used in winter scenarios.

[0138] Alternatively, the six-way valve has its port u connected to its port y, and its port w connected to its port x. Based on this, the battery pack cooling flow path 101, the electric drive water pump 204, the electric drive assembly cooling flow path 201, the battery water pump 102, the battery-side heater 104, and the battery cooler 103 together form a series circuit. In this operating condition, the heat from the electric drive assembly can be used to heat the battery pack; this condition is often used in winter scenarios.

[0139] In summary, the coolant filling and venting method provided in this embodiment of the invention can control the multi-way valve group 300 to switch to a first conducting state, so as to vent the electric drive thermal management branch 200 and inject coolant; it can control the multi-way valve group 300 to switch to a second conducting state, so as to release air locally in the electric drive thermal management branch 200 and locally in the battery thermal management branch 100; and it can control the multi-way valve group 300 to switch to a third conducting state, so as to vent the electric drive thermal management branch 200 and the battery thermal management branch 100 and inject coolant. Based on the above, the coolant filling and venting control method provided in this application realizes simultaneous filling and venting, thereby avoiding the problem of residual excess air affecting the cooling effect, preventing overheating of the battery or electric drive, and ensuring the performance and safety of the vehicle.

[0140] Please see Figure 8 To execute the possible steps of the coolant filling and venting control method provided in the above embodiments, this embodiment of the invention provides a coolant filling and venting control device 20, applied to a thermal management system 10, for executing the above-described coolant filling and venting control method. It should be noted that the basic principle and technical effects of the coolant filling and venting control device 20 provided in this embodiment are basically the same as those in the above embodiments. For the sake of brevity, any parts not mentioned in this embodiment can be referred to the corresponding content in the above embodiments.

[0141] The coolant filling and venting control device 20 provided in this embodiment may include a first control module 210, a second control module 220 and a third control module 230.

[0142] The first control module 210 is used to control the multi-way valve group 300 to switch to the first conduction state, so that the battery thermal management branch 100 and the electric drive thermal management branch 200 enter the parallel mode; wherein, the parallel mode is used for the electric drive thermal management branch 200 to exhaust and inject coolant.

[0143] Optionally, the first control module 210 can be used to execute step S410 in the above control method to achieve the corresponding technical effect.

[0144] The second control module 220 is used to control the multi-way valve group 300 to switch to the second conduction state after a first preset time, so that the battery thermal management branch 100 and the electric drive thermal management branch 200 enter the first series mode; wherein, the first series mode is used for local air release of the electric drive thermal management branch 200 and the battery thermal management branch 100.

[0145] Optionally, the second control module 220 can be used to execute step S450 in the above control method to achieve the corresponding technical effect.

[0146] The third control module 230 is used to control the multi-way valve group 300 to switch to the third conduction state after the second preset time period, so that the battery thermal management branch 100 and the electric drive thermal management branch 200 enter the second series mode; wherein, the second series mode is used for the electric drive thermal management branch 200 and the battery thermal management branch 100 to exhaust and inject coolant.

[0147] Optionally, the third control module 230 can be used to execute step S460 in the above control method to achieve the corresponding technical effect.

[0148] In addition, some embodiments of the present invention also provide a computer-readable storage medium storing a computer program, which, when executed by the processor 120, implements the coolant filling and venting control method provided in any of the above embodiments.

[0149] Additionally, some embodiments of the present invention also provide a thermal management system 10, including one or more processors 120 and a memory 110. The memory 110 is used to store computer program code, which includes a computer program. When one or more processors 120 execute the computer program, the processors 120 perform the coolant filling and venting control method provided in any of the above embodiments.

[0150] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative; for example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0151] In addition, the functional modules in the various embodiments of the present invention can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0152] If the functionality is implemented as a software module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, 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 of the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0153] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for controlling coolant filling and venting, applied to a thermal management system, the thermal management system comprising a battery thermal management branch, an electric drive thermal management branch, and a multi-way valve group, the multi-way valve group being used to control the connection state of the battery thermal management branch and the electric drive thermal management branch, characterized in that, The method includes: The multi-way valve group is controlled to switch to the first conducting state, so that the battery thermal management branch and the electric drive thermal management branch enter parallel mode; wherein, the parallel mode is used for the electric drive thermal management branch to exhaust and inject coolant; After a first preset time period, the multi-way valve group is controlled to switch to the second conduction state, so that the battery thermal management branch and the electric drive thermal management branch enter the first series mode; wherein, the first series mode is used for local air release of the electric drive thermal management branch and the battery thermal management branch. After a second preset time period, the multi-way valve group is controlled to switch to a third conduction state, so that the battery thermal management branch and the electric drive thermal management branch enter a second series mode; wherein, the second series mode is used for the electric drive thermal management branch and the battery thermal management branch to exhaust and inject coolant.

2. The coolant filling and venting control method according to claim 1, characterized in that, The battery thermal management branch includes a battery pack cooling flow path, a battery water pump, a battery-side heater, and a battery cooler connected in series. The electric drive thermal management branch includes an electric drive assembly cooling flow path, a low-temperature radiator, an expansion tank, and an electric drive water pump connected in series. The thermal management system also includes a first pipeline and a second pipeline, wherein the first pipeline is the pipeline between the battery cooler and the battery pack cooling flow path, and the second pipeline is the pipeline between the electric drive assembly cooling flow path and the low-temperature radiator. The multi-way valve group is disposed between the battery thermal management branch and the electric drive thermal management branch, and is disposed between the first pipeline and the second pipeline. The step of controlling the multi-way valve group to switch to the first conducting state, so that the battery thermal management branch and the electric drive thermal management branch enter parallel mode, includes: The multi-way valve group is controlled to connect the expansion tank and the electric water pump, and also to connect the battery pack cooling flow path and the battery water pump, so that the battery thermal management branch is connected in parallel with the electric drive thermal management branch.

3. The coolant filling and venting control method according to claim 2, characterized in that, The step of controlling the multi-way valve group to switch to the second conducting state, so that the battery thermal management branch and the electric drive thermal management branch enter the first series mode, includes: The multi-way valve group is controlled to connect the electric water pump and the first pipeline, and to connect the battery water pump and the second pipeline, so that the battery-side heater, the battery cooler, the electric water pump, the electric drive assembly cooling flow path and the battery water pump are connected in series.

4. The coolant filling and venting control method according to claim 3, characterized in that, The step of controlling the multi-way valve group to switch to the third conducting state, so that the battery thermal management branch and the electric drive thermal management branch enter the second series mode, includes: The multi-way valve group is controlled to connect the expansion tank and the battery water pump, and to connect the battery pack cooling flow path and the electric drive water pump, so that the expansion tank, the battery water pump, the battery side heater, the battery cooler, the battery pack cooling flow path, the electric drive water pump, the electric drive assembly cooling flow path, and the low-temperature radiator are connected in series.

5. The coolant filling and venting control method according to claim 4, characterized in that, While controlling the multi-way valve group to switch to the first conducting state, the system also controls the electric water pump to rotate and controls the battery water pump to stop rotating. While controlling the multi-way valve group to switch to the second conduction state, the electric water pump is also controlled to rotate, and the battery water pump is also controlled to rotate. While controlling the multi-way valve group to switch to the third conduction state, the system also controls the rotation of the electric water pump and the battery water pump.

6. The coolant filling and venting control method according to any one of claims 1 to 5, characterized in that, After the step of controlling the multi-way valve group to switch to the first conducting state, causing the battery thermal management branch and the electric drive thermal management branch to enter parallel mode, and before the step of controlling the multi-way valve group to switch to the second conducting state, causing the battery thermal management branch and the electric drive thermal management branch to enter the first series mode, the method further includes: After a third preset time period, the multi-way valve group is controlled to switch to the third conduction state, so that the battery thermal management branch and the electric drive thermal management branch enter the second series mode.

7. The coolant filling and venting control method according to claim 6, characterized in that, After the step of controlling the multi-way valve group to switch to the third conducting state, causing the battery thermal management branch and the electric drive thermal management branch to enter the second series mode, and before the step of controlling the multi-way valve group to switch to the second conducting state, causing the battery thermal management branch and the electric drive thermal management branch to enter the first series mode, the method further includes: After a fourth preset time period, the multi-way valve group is controlled to switch to the first conduction state, so that the battery thermal management branch and the electric drive thermal management branch enter the parallel mode.

8. The coolant filling and venting control method according to claim 7, characterized in that, After the step of controlling the multi-way valve group to switch to the first conducting state, causing the battery thermal management branch and the electric drive thermal management branch to enter the parallel mode, and before the step of controlling the multi-way valve group to switch to the second conducting state, causing the battery thermal management branch and the electric drive thermal management branch to enter the first series mode, the method further includes: After a fifth preset time period, the multi-way valve group is controlled to switch to the third conduction state, so that the battery thermal management branch and the electric drive thermal management branch enter the second series mode.

9. The coolant filling and venting control method according to any one of claims 2 to 5, characterized in that, Also includes: Determine if project configuration information exists; If the project configuration information does not exist, the multi-way valve group is controlled to switch to the fourth conduction state, so that the battery thermal management branch and the electric drive thermal management branch enter the fully connected mode, so as to add coolant after the thermal management system is evacuated; If the project configuration information exists, then the step of "controlling the multi-way valve group to switch to the first conduction state, so that the battery thermal management branch and the electric drive thermal management branch enter the parallel mode" is executed to vent the thermal management system and add coolant.

10. The coolant filling and venting control method according to claim 9, characterized in that, The step of controlling the multi-way valve group to switch to the fourth conducting state, so that the battery thermal management branch and the electric drive thermal management branch enter the fully connected mode, includes: The multi-way valve group is controlled to connect the expansion tank and the battery water pump, as well as the battery pack cooling flow path and the electric drive water pump, and the first pipeline and the second pipeline, so that the battery cooler, the battery-side heater, the battery water pump, the expansion tank and the low-temperature radiator are connected in series, and the electric drive assembly cooling flow path, the electric drive water pump and the battery pack cooling flow path are connected in series, and the expansion tank, the battery water pump, the battery-side heater, the battery cooler, the battery pack cooling flow path, the electric drive water pump, the electric drive assembly cooling flow path and the low-temperature radiator are connected in series.

11. The coolant filling and venting control method according to claim 9, characterized in that, While controlling the multi-way valve group to switch to the fourth conduction state, the system also controls the battery water pump to stop rotating and the electric water pump to stop rotating.

12. The coolant filling and venting control method according to any one of claims 1 to 5, characterized in that, Before the step of controlling the multi-way valve group to switch to the first conducting state, so that the battery thermal management branch and the electric drive thermal management branch enter parallel mode, the method further includes: Obtain diagnostic instructions while the vehicle is stationary; Based on the diagnostic instructions, the system diagnoses whether the vehicle's condition allows for coolant filling and venting, and determines whether the diagnostic results are correct. If the diagnostic result is correct, then the step of "controlling the multi-way valve group to switch to the first conduction state, so that the battery thermal management branch and the electric drive thermal management branch enter parallel mode" is executed.

13. The coolant filling and venting control method according to claim 12, characterized in that, The stationary state indicates that the vehicle simultaneously meets the following conditions: The vehicle is powered on; The gear is in P (Park) position; The front hood is open; The vehicle speed is zero; and, The voltage of the small battery is within the normal range.

14. The coolant filling and venting control method according to any one of claims 1 to 5, characterized in that, After the step of controlling the multi-way valve group to switch to the first conducting state, causing the battery thermal management branch and the electric drive thermal management branch to enter parallel mode, the method further includes: After the sixth preset time period, the control button flashes and then remains off, and the control valve group controls the battery thermal management branch and the electric drive thermal management branch to be at least partially connected in parallel or at least partially connected in series.

15. A coolant filling and venting control device, applied to a thermal management system, the thermal management system comprising a battery thermal management branch, an electric drive thermal management branch, and a multi-way valve group, the multi-way valve group being used to control the connection state of the battery thermal management branch and the electric drive thermal management branch, characterized in that, include: The first control module is used to control the multi-way valve group to switch to the first conduction state, so that the battery thermal management branch and the electric drive thermal management branch enter the parallel mode; wherein, the parallel mode is used for the electric drive thermal management branch to exhaust and inject coolant; The second control module is used to control the multi-way valve group to switch to the second conduction state after a first preset time period, so that the battery thermal management branch and the electric drive thermal management branch enter the first series mode; wherein, the first series mode is used for local air release of the electric drive thermal management branch and local air release of the battery thermal management branch. The third control module is used to control the multi-way valve group to switch to the third conduction state after a second preset time period, so that the battery thermal management branch and the electric drive thermal management branch enter the second series mode; wherein, the second series mode is used for the electric drive thermal management branch and the battery thermal management branch to exhaust and inject coolant.

16. A thermal management system, characterized in that, include: One or more processors and a memory; the memory is used to store computer program code, the computer program code including a computer program; when the one or more processors execute the computer program, the processors perform the coolant filling and venting control method as described in any one of claims 1 to 14.

17. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the coolant filling and venting control method as described in any one of claims 1 to 14.

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