Discharge cooling control method, thermal management system and electric mining truck

Abstract

This application provides a discharge cooling control method, a thermal management system, and an electric mining truck. The method includes: acquiring the discharge current value of the battery system when the battery system is in a discharge state; when the current value is greater than a preset current value, controlling the speed of a first water pump according to the current value, so that the flow rate of coolant in the large circulation loop follows the change in current value, until the current value is less than or equal to the preset current value; when the current value is less than or equal to the preset current value, controlling the speed of a second water pump according to the current value, so that the flow rate of coolant in the small circulation loop follows the change in current value, until the current value is greater than the preset current value. This application can improve the operational reliability of the electric mining truck.

Description

Technical Field

[0001] This application relates to the field of discharge cooling technology, and in particular to a discharge cooling control method, thermal management system and electric mining truck. Background Technology

[0002] Mining trucks (or mining trucks for short) are heavy-duty dump trucks used in open-pit mines for tasks such as rock and soil stripping and ore transportation. With continuous economic development, the demand for mining trucks continues to grow, and due to economic and environmental requirements, mining trucks are constantly being upgraded and replaced.

[0003] To meet environmental protection requirements, the applicant has developed an electric mining truck that operates entirely on electric power. The battery system, as the core driving component of the electric mining truck, requires careful cooling during operation. Discharging the battery system within a reasonable temperature range helps ensure the reliable operation of the electric mining truck.

[0004] Most existing battery cooling methods control the liquid cooling system based on the battery's operating temperature to keep the battery within a suitable operating temperature range and ensure stable operation. However, the battery system of electric mining trucks is the core drive system, and its cooling requirements are relatively high during discharge. The aforementioned temperature-based liquid cooling system control methods suffer from lag and poor real-time performance, making them unsuitable for electric mining trucks. Summary of the Invention

[0005] This application provides a discharge cooling control method, a thermal management system, and an electric mining truck to improve the operational reliability of the battery system of the electric mining truck during the discharge process.

[0006] In a first aspect, embodiments of this application provide a discharge cooling control method for an electric mining truck. The electric mining truck includes a battery system and a liquid cooling system. The battery system includes a battery water tank, and the liquid cooling system includes a coolant tank, a first water pump, and a second water pump.

[0007] The coolant tank has one end connected to one end of the battery water tank and one end of the second water pump, and the other end connected to one end of the first water pump; the other end of the first water pump is connected to the other end of the battery water tank and the other end of the second water pump; wherein, the connection loop between the coolant tank, the first water pump and the battery water tank forms a large circulation loop, and the connection loop between the second water pump and the battery water tank forms a small circulation loop.

[0008] Discharge cooling control methods include:

[0009] When the battery system is in a discharging state, obtain the current value of the battery system's discharge current;

[0010] When the current value is greater than the preset current value, the speed of the first water pump is controlled according to the current value so that the flow rate of the coolant in the large circulation loop follows the change of the current value until the current value is less than or equal to the preset current value; wherein, the speed of the first water pump increases as the current value increases;

[0011] When the current value is less than or equal to the preset current value, the speed of the second water pump is controlled according to the current value so that the flow rate of the coolant in the small circulation loop follows the change of the current value until the current value is greater than the preset current value; wherein, the speed of the second water pump increases as the current value increases.

[0012] In one possible implementation, the battery system's discharge operating modes include a variable current mode and a constant current mode, and the cooling control method also includes:

[0013] When the battery system switches from variable current mode to constant current mode, the first constant current value of the current discharge current is obtained, and the first constant speed corresponding to the first constant current value is determined.

[0014] If the first constant current value is greater than the preset current value, the first water pump is controlled to rotate at the first constant speed, and after the first preset time, the first water pump is controlled to stop, and the second water pump is controlled to rotate at the first constant speed.

[0015] In one possible implementation, the cooling control method further includes:

[0016] If the first constant current value is less than or equal to the preset current value, the second water pump is controlled to rotate at the first constant speed, and after the second preset time, the second water pump is controlled to stop, and the first water pump is controlled to rotate at the first constant speed.

[0017] The first preset duration is shorter than the second preset duration.

[0018] In one possible implementation, the battery system's discharge operating modes include a variable current mode and a constant current mode, and the discharge cooling control method further includes:

[0019] When the battery system switches from constant current mode to variable current mode, the second constant current value of the current discharge current is obtained, and the second constant speed corresponding to the second constant current value is determined.

[0020] If the second constant current value is greater than the preset current value, and the discharge current value of the battery system gradually increases, the speed of the first water pump is controlled according to the discharge current value, and the second water pump is controlled to rotate at the second constant speed. After the third preset time, the second water pump is controlled to stop.

[0021] In one possible implementation, the discharge cooling control method further includes:

[0022] If the second constant current value is less than or equal to the preset current value, and the current value of the battery system discharge current gradually decreases, then the speed of the second water pump is controlled according to the current value of the discharge current, and the first water pump is controlled to rotate at the second constant speed. After the fourth preset time, the first water pump is controlled to stop.

[0023] The third preset duration is shorter than the fourth preset duration.

[0024] In one possible implementation, the formula for controlling the speed of the first water pump based on the current value is:

[0025]

[0026] Where V1 represents the rotational speed of the first water pump, T0 represents the temperature of the battery cell in the battery system, and T 11 The temperature of the inlet water connecting the battery water tank and the first water pump is represented by T. 21 This indicates the outlet temperature of the battery water tank connected to the coolant tank; I represents the discharge current value; and K represents the rotation coefficient.

[0027] The formula for controlling the speed of the second water pump based on the current value is as follows:

[0028]

[0029] Where V2 represents the rotational speed of the second water pump, and T 12 The temperature of the inlet water connecting the battery water tank and the second water pump is represented by T. 22 This indicates the temperature of the water outlet where the battery water tank connects to the second water pump.

[0030] Secondly, this application provides a discharge cooling control device for an electric mining truck. The electric mining truck includes a battery system and a liquid cooling system. The battery system includes a battery water tank, and the liquid cooling system includes a coolant tank, a first water pump, and a second water pump.

[0031] The coolant tank has one end connected to one end of the battery water tank and one end of the second water pump, and the other end connected to one end of the first water pump; the other end of the first water pump is connected to the other end of the battery water tank and the other end of the second water pump; wherein, the connection loop between the coolant tank, the first water pump and the battery water tank forms a large circulation loop, and the connection loop between the second water pump and the battery water tank forms a small circulation loop.

[0032] The discharge cooling control device includes:

[0033] The data acquisition module is used to acquire the current value of the discharge current of the battery system when the battery system is in a discharge state;

[0034] The first control module is used to control the speed of the first water pump according to the current value when the current value is greater than the preset current value, so that the flow rate of the coolant in the large circulation loop follows the change of the current value until the current value is less than or equal to the preset current value; wherein, the speed of the first water pump increases as the current value increases;

[0035] The second control module is used to control the speed of the second water pump according to the current value when the current value is less than or equal to the preset current value, so that the flow rate of the coolant in the small circulation loop follows the change of the current value until the current value is greater than the preset current value; wherein, the speed of the second water pump increases as the current value increases.

[0036] Thirdly, embodiments of this application provide a thermal management system, including a memory and a processor. The memory stores a computer program that can run on the processor. When the processor executes the computer program, it implements the steps of the discharge cooling control method for electric mining trucks as described in the first aspect or any possible implementation of the first aspect.

[0037] Fourthly, embodiments of this application provide an electric mining truck, including the thermal management system described in the third aspect above.

[0038] Fourthly, embodiments of this application provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the discharge cooling control method for an electric mining truck as described in the first aspect or any possible implementation of the first aspect.

[0039] This application provides a discharge cooling control method, a thermal management system, and an electric mining truck. The electric mining truck includes a battery system and a liquid cooling system, with a large circulation loop and a small circulation loop between the liquid cooling system and the battery system. By acquiring the discharge current value of the battery system, when the current value is greater than a preset current value, the flow rate of the first water pump is controlled according to the current value to control the flow rate of the coolant in the large circulation loop, achieving rapid cooling. When the current value is not greater than the preset current value, the flow rate of the second water pump is controlled according to the current value to control the flow rate of the coolant in the small circulation loop, achieving cyclic cooling. The circulation flow rate can be controlled in real time according to the current value to ensure the cooling effect of the battery system and improve the operational reliability of the electric mining truck. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the structure of an electric mining truck provided in an embodiment of this application;

[0042] Figure 2 This is a flowchart illustrating the implementation of the discharge cooling control method for the electric mining truck provided in this application embodiment;

[0043] Figure 3 This is a schematic diagram of the discharge cooling control device for the electric mining truck provided in the embodiments of this application;

[0044] Figure 4 This is a schematic diagram of the thermal management system provided in an embodiment of this application. Detailed Implementation

[0045] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0046] To make the objectives, technical solutions, and advantages of this application clearer, the following description will be provided in conjunction with the accompanying drawings and specific embodiments.

[0047] For economic and environmental reasons, and while meeting usage requirements, the applicant has developed an electric mining truck. This truck is purely electric and uses electricity to drive digging, mining, and transportation functions. During the charging process, battery cooling is particularly important; ensuring normal, rapid, and reliable battery charging relies heavily on controlled heat dissipation strategies.

[0048] Most existing mining trucks are fuel-powered, and their cooling strategies are mostly designed for high-power operating mechanisms such as engines and starters, which are not suitable for battery systems, which are the core of the drive system.

[0049] In addition, most existing electric vehicle charging cooling strategies determine whether to activate cooling based on the battery temperature, which has a lag and poor real-time performance, making it unsuitable for electric mining trucks.

[0050] In embodiments of this application, the electric mining truck may include a battery system, a thermal management system, and a liquid cooling system. The thermal management system can be connected to both the battery system and the liquid cooling system for receiving, collecting, and controlling their operation. The battery system includes multiple battery clusters and a battery management unit, while the liquid cooling system includes multiple liquid cooling units.

[0051] Figure 1This is a structural schematic diagram of an electric mining truck provided in an embodiment of this application. Figure 1 As shown in the embodiments of this application, the electric mining truck includes a battery system and a liquid cooling system. The battery system includes a battery water tank, and the liquid cooling system includes a coolant tank, a first water pump, and a second water pump.

[0052] The coolant tank has one end connected to one end of the battery water tank and one end of the second water pump, and the other end connected to one end of the first water pump; the other end of the first water pump is connected to the other end of the battery water tank and the other end of the second water pump.

[0053] The connection loop between the coolant tank, the first water pump, and the battery water tank forms a large circulation loop, while the connection loop between the second water pump and the battery water tank forms a small circulation loop.

[0054] See Figure 2 This illustrates a flowchart of the discharge cooling control method for an electric mining truck provided in an embodiment of this application. Figure 2 As shown, a discharge cooling control method for an electric mining truck may include steps S101 to S103.

[0055] S101: When the battery system is in a discharging state, the current value of the discharge current of the battery system is obtained.

[0056] The execution subject of this application embodiment can be the central control system, thermal management system (TMS) of the electric mining truck, or other control system that can be connected to the battery system and liquid cooling system. The specific choice can be made according to the actual situation. This application embodiment uses TMS as the execution subject for description, and the same applies to others, which will not be repeated here.

[0057] The embodiments of this application can detect the operating state of the battery system, which may include charging state, discharging state, and shutdown state.

[0058] In embodiments of this application, the battery system may include multiple battery clusters and a battery management system (BMS), wherein the multiple battery clusters are connected in parallel to provide power for electric mining trucks.

[0059] Optionally, the battery system of the electric mining truck can be considered to be in a discharging state after detecting that the electric mining truck has started working or receiving an external discharge command.

[0060] When the battery system is detected to be in a discharging state, the discharge current value of the battery system can be obtained in real time through the battery system's BMS.

[0061] S102, when the current value is greater than the preset current value, the speed of the first water pump is controlled according to the current value so that the flow rate of the coolant in the large circulation loop follows the change of the current value until the current value is less than or equal to the preset current value; wherein, the speed of the first water pump increases as the current value increases.

[0062] When the discharge current of the battery system is greater than the preset current value, it indicates that the current value is large and the heat generated by the discharge is high. It is necessary to control the speed of the first water pump according to the current current value so that the flow rate of the coolant in the large circulation loop changes with the current value. This allows the coolant in the coolant tank to participate in the cooling circulation of the battery water tank, quickly cooling down the battery water tank and ensuring that the battery water tank operates at a suitable temperature.

[0063] In the embodiments of this application, the heat dissipated by the battery water tank under different discharge currents can be determined in advance based on the heat dissipation parameters of the battery water tank, the battery charge, and the magnitude of the discharge current. Then, different coolant flow rates are calibrated according to different heat levels to ensure the battery water tank operates at a suitable temperature. That is, the optimal speed of the first water pump can be pre-calibrated for different current values, with each current value corresponding to a different speed of the first water pump.

[0064] In the embodiments of this application, the rotational speed of the first water pump increases as the discharge current value increases and decreases as the discharge current value decreases.

[0065] Optionally, the current value of each discharge current can correspond to the rotational speed of a first water pump. Alternatively, the range of current values ​​for each discharge current can correspond to the rotational speed of a first water pump. The specific value can be determined based on the actual situation, and the two generally show a positive correlation.

[0066] S103, when the current value is less than or equal to the preset current value, the speed of the second water pump is controlled according to the current value so that the flow rate of the coolant in the small circulation loop follows the change of the current value until the current value is greater than the preset current value; wherein, the speed of the second water pump increases as the value of the current increases.

[0067] When the discharge current of the battery system is less than or equal to the preset current value, it indicates that the current value is small and the heat generated by the discharge is small. The speed of the second water pump can be controlled according to the current current value so that the flow rate of the coolant in the small circulation loop changes with the current current value, so as to reasonably cool down the battery water tank and ensure that the battery water tank works at a suitable temperature.

[0068] In the embodiments of this application, the heat dissipated by the battery water tank under different discharge currents can be determined in advance based on the heat dissipation parameters of the battery water tank, the battery charge, and the magnitude of the discharge current. Then, different coolant flow rates are calibrated according to different heat levels to ensure the battery water tank operates at a suitable temperature. That is, the optimal speed of the second water pump under different current values ​​can be pre-calibrated, with each current value corresponding to a different speed of the second water pump.

[0069] In the embodiments of this application, the rotational speed of the second water pump increases as the discharge current value increases and decreases as the discharge current value decreases.

[0070] Optionally, the current value of each discharge current can correspond to the rotational speed of a second water pump. Alternatively, the range of current values ​​for each discharge current can correspond to the rotational speed of a second water pump. The specific value can be determined based on the actual situation, and the two generally show a positive correlation.

[0071] In the embodiments of this application, when only the large circulation loop is operating, the coolant in the coolant tank participates in the circulation cooling, enabling rapid cooling. When only the small circulation loop is operating, the coolant in the coolant tank does not participate in the circulation cooling; only the coolant in the circulation loop circulates for cooling. This reduces the circulation frequency of the coolant in the coolant tank while ensuring the cooling effect, preventing excessive consumption or deterioration of the coolant's effectiveness. It also allows the coolant to be rotated for cooling, ensuring the cooling effect of the electric mining truck's liquid cooling system and extending its service life.

[0072] This application embodiment controls the operation of the first or second water pump according to the current value of the discharge current, so as to realize the cooling of the battery water tank by using a large circulation loop or a small circulation loop, which makes the control more precise and improves the working reliability of the electric mining truck.

[0073] In the embodiments of this application, the first water pump and the second water pump may not operate simultaneously. That is, when the first water pump is running, the second water pump is stopped; when the first water pump is stopped, the second water pump is running. Alternatively, the second water pump and the second water pump may operate simultaneously in some cases. The specific operation can be determined based on the actual situation.

[0074] In some embodiments of this application, the discharge operating modes of the battery system include a variable current mode and a constant current mode. The variable current mode is the operating state where the discharge current of the battery system changes in real time, while the constant current mode is the operating state where the battery system discharges with a constant current.

[0075] The discharge cooling control method for electric mining trucks provided in this application embodiment may further include:

[0076] When the battery system switches from variable current mode to constant current mode, the first constant current value of the current discharge current is obtained, and the first constant speed corresponding to the first constant current value is determined.

[0077] If the first constant current value is greater than the preset current value, the first water pump is controlled to rotate at the first constant speed, and after the first preset time, the first water pump is controlled to stop, and the second water pump is controlled to rotate at the first constant speed.

[0078] Optionally, when the battery system is in converter mode, the discharge current may gradually increase or gradually decrease. When the battery system switches from converter mode to constant current mode, the discharge current may gradually increase to a first constant current value or gradually decrease to a first constant current value.

[0079] The embodiments of this application can obtain the first constant current value of the discharge current in constant current mode, and can determine the first constant speed corresponding to the first constant current value.

[0080] When the first constant current value is greater than the preset current value, it indicates that the first water pump is currently in operation. The first water pump can be controlled to rotate at a first constant speed so that the coolant in the coolant tank participates in the cooling cycle through the large circulation loop. After the first water pump has been controlled to rotate at the first constant speed for a first preset time, the coolant in the coolant tank has fully participated in the circulation, and the large circulation loop has been fully cooled.

[0081] At this point, the first water pump can be stopped, and the second water pump can be controlled to rotate at the first constant speed. The coolant in the large circulation loop can enter the small circulation loop to participate in the cooling cycle. While ensuring the cooling effect, the coolant in the small circulation loop can be replaced, and the coolant in the coolant tank can be prevented from frequently participating in the circulation, thus extending the service life of the coolant.

[0082] In the embodiments of this application, after controlling the second water pump to rotate at a first constant speed for a first preset time, if the battery system is still in constant current mode, the second water pump can be stopped, and the first water pump can be controlled to rotate at a first constant speed to ensure the overall cooling effect so that the battery system is in the normal discharge temperature range.

[0083] In addition, by alternating the first and second water pumps at the first constant speed, the cooling effect of the coolant in the large and small circulation loops can be guaranteed, the discharge reliability of the battery system can be improved, and thus the working reliability of the electric mining truck can be improved.

[0084] The discharge cooling control method for electric mining trucks provided in this application embodiment may further include:

[0085] If the first constant current value is less than or equal to the preset current value, the second water pump is controlled to rotate at the first constant speed, and after the second preset time, the second water pump is controlled to stop, and the first water pump is controlled to rotate at the first constant speed; wherein the first preset time is less than the second preset time.

[0086] When the first constant current value is less than or equal to the preset current value, it indicates that the second water pump is currently in operation. The second water pump can be controlled to rotate at a first constant speed to cool the battery tank through a small circulation loop. After the second water pump has been controlled to rotate at the first constant speed for a second preset time, the cooling effect of the coolant in the small circulation loop may deteriorate.

[0087] At this time, the second water pump can be stopped, and the first water pump can be controlled to rotate at the first constant speed. The coolant in the coolant tank can participate in the circulation through the large circulation loop, and the coolant in the large circulation loop can be used to cool down the battery water tank to ensure the discharge reliability of the battery system.

[0088] In the embodiments of this application, after controlling the first water pump to rotate at a first constant speed for a second preset time, if the battery system is still in constant current mode, the first water pump can be stopped, and the second water pump can be controlled to rotate at a first constant speed to replace the coolant in the small circulation loop and ensure the cooling effect.

[0089] The discharge cooling control method for electric mining trucks provided in this application embodiment may further include:

[0090] When the battery system switches from constant current mode to variable current mode, the second constant current value of the current discharge current is obtained, and the second constant speed corresponding to the second constant current value is determined.

[0091] If the second constant current value is greater than the preset current value, and the discharge current value of the battery system gradually increases, the speed of the first water pump is controlled according to the discharge current value, and the second water pump is controlled to rotate at the second constant speed. After the third preset time, the second water pump is controlled to stop.

[0092] In this embodiment, when the battery system switches from constant current mode to variable current mode, a second constant current value of the battery system in constant current mode can be obtained. When the second constant current value is greater than a preset current value, and the discharge current gradually increases, it indicates that the battery water tank is mainly cooled through the large circulation loop, and the first water pump is working. The speed of the first water pump can be controlled according to the discharge current value so that the first water pump rotates in accordance with the current value, ensuring the cooling effect of the battery system.

[0093] At the same time, the second water pump can be controlled to rotate at a second constant speed to refresh the coolant in the small circulation loop. Meanwhile, the large circulation loop and the small circulation loop simultaneously cool the battery water tank, ensuring the reliability of the battery system in the discharge state.

[0094] After the second water pump is controlled to rotate at a second constant speed for a third preset time, the coolant in the small circulation loop has been renewed. At this time, the second water pump can be stopped, and the first water pump can be controlled to work only according to the current value to cool down the battery water tank.

[0095] This embodiment controls the first and second water pumps to rotate at different speeds, thereby achieving coolant exchange between the large and small circulation loops while ensuring the cooling effect. This further ensures the reliability of the battery system during discharge and improves the reliability of the electric mining truck.

[0096] The discharge cooling control method for electric mining trucks provided in this application embodiment may further include:

[0097] If the second constant current value is less than or equal to the preset current value, and the discharge current value of the battery system gradually decreases, the speed of the second water pump is controlled according to the discharge current value, and the first water pump is controlled to rotate at the second constant speed. After the fourth preset time, the first water pump is controlled to stop. The third preset time is less than the fourth preset time.

[0098] In this embodiment, when the battery system switches from constant current mode to variable current mode, a second constant current value of the battery system in constant current mode can be obtained. When the second constant current value is less than or equal to a preset current value, and the discharge current value gradually decreases, it indicates that the battery water tank is mainly cooled through a small circulation loop, and the second water pump is working. The speed of the second water pump can be controlled according to the discharge current value so that the second water pump rotates in accordance with the current value, ensuring the cooling effect of the battery system.

[0099] At the same time, the first water pump can be controlled to rotate at a second constant speed to refresh the coolant in the large and small circulation loops. Simultaneously, the large and small circulation loops cool the battery water tank, ensuring the reliability of the battery system in the discharge state.

[0100] After the first water pump is controlled to rotate at a second constant speed for a fourth preset time, the coolant in the large and small circulation loops has been renewed. At this time, the first water pump can be stopped, and the second water pump can be controlled to work only according to the current value to cool down the battery water tank.

[0101] In the embodiments of this application, the third preset duration may be less than the fourth preset duration.

[0102] Since the large circulation loop has a better cooling effect, when the second constant current value is greater than the preset current value, the first water pump becomes the main water pump and the second water pump becomes the auxiliary water pump. At this time, only the coolant in the small circulation loop needs to be replaced, and there is no need to control the second water pump to work for too long.

[0103] When the second constant current value is less than or equal to the preset current value, the first water pump is an auxiliary water pump and the second water pump is a water injection pump. The longer the working time of the second water pump can accelerate the cooling effect, so the rotation time of the first water pump can be controlled to be longer.

[0104] This embodiment of the application controls the second water pump to rotate following the current value when the second constant current value is less than or equal to the preset current value, and controls the first water pump to rotate at the second constant speed for a fourth preset time before stopping. This can accelerate the cooling of the battery water tank, improve the cooling effect, and improve the working efficiency of the battery system.

[0105] In some embodiments of this application, when the current value is greater than a preset current value, the formula for controlling the speed of the first water pump based on the current value is as follows:

[0106]

[0107] Where V1 represents the rotational speed of the first water pump, T0 represents the temperature of the battery cell in the battery system, and T 11 The temperature of the inlet water connecting the battery water tank and the first water pump is represented by T. 21 The value of I represents the outlet temperature of the battery water tank connected to the coolant tank, and the value of K represents the rotation coefficient.

[0108] When the current value is less than or equal to the preset current value, the formula for controlling the speed of the second water pump based on the current value is as follows:

[0109]

[0110] Where V2 represents the rotational speed of the second water pump, and T 12 The temperature of the inlet water connecting the battery water tank and the second water pump is represented by T. 22 This indicates the temperature of the water outlet where the battery water tank connects to the second water pump.

[0111] The rotation coefficient K can be determined experimentally. Under ideal cooling conditions, 2T0 = T 12 +T 22 2T0=T 11 +T 21 .

[0112] In the embodiments of this application, the path lengths of the large circulation loop and the small circulation loop are different, and the positions of their outlets and inlets are also different. Under different circumstances, the rotational speed of the first or second water pump can be calculated based on the outlet temperature, inlet temperature, and cell temperature to ensure the cooling effect of the battery water tank and improve operational reliability.

[0113] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0114] The following are device embodiments of this application. For details not described in detail, please refer to the corresponding method embodiments described above.

[0115] Figure 3 A schematic diagram of the discharge cooling control device for an electric mining truck according to an embodiment of this application is shown. For ease of explanation, only the parts related to the embodiment of this application are shown, and are described in detail below:

[0116] like Figure 3 As shown, the electric mining truck discharge cooling control device 20 includes a battery system and a liquid cooling system. The battery system includes a battery water tank, and the liquid cooling system includes a coolant tank, a first water pump, and a second water pump.

[0117] The coolant tank has one end connected to one end of the battery water tank and one end of the second water pump, and the other end connected to one end of the first water pump; the other end of the first water pump is connected to the other end of the battery water tank and the other end of the second water pump; wherein, the connection loop between the coolant tank, the first water pump and the battery water tank forms a large circulation loop, and the connection loop between the second water pump and the battery water tank forms a small circulation loop.

[0118] The discharge cooling control device 20 includes:

[0119] The data acquisition module 201 is used to acquire the current value of the discharge current of the battery system when the battery system is in a discharge state;

[0120] The first control module 202 is used to control the speed of the first water pump according to the current value when the current value is greater than the preset current value, so that the flow rate of the coolant in the large circulation loop follows the change of the current value until the current value is less than or equal to the preset current value; wherein, the speed of the first water pump increases as the current value increases;

[0121] The second control module 203 is used to control the speed of the second water pump according to the current value when the current value is less than or equal to the preset current value, so that the flow rate of the coolant in the small circulation loop follows the change of the current value until the current value is greater than the preset current value; wherein, the speed of the second water pump increases as the value of the current value increases.

[0122] In some embodiments of this application, the discharge operating modes of the battery system include a variable current mode and a constant current mode, and the discharge cooling control device 20 further includes:

[0123] The third control module is used to obtain the first constant current value of the current discharge current and determine the first constant speed corresponding to the first constant current value when the battery system switches from variable current mode to constant current mode.

[0124] The fourth control module is used to control the first water pump to rotate at a first constant speed if the first constant current value is greater than the preset current value, and to control the first water pump to stop after a first preset time, and to control the second water pump to rotate at the first constant speed.

[0125] In some embodiments of this application, the discharge cooling control device 20 further includes:

[0126] The fifth control module is used to control the second water pump to rotate at a first constant speed if the first constant current value is less than or equal to the preset current value, and after a second preset time, control the second water pump to stop and control the first water pump to rotate at the first constant speed.

[0127] The first preset duration is shorter than the second preset duration.

[0128] In some embodiments of this application, the discharge operating modes of the battery system include a variable current mode and a constant current mode, and the discharge cooling control device 20 further includes:

[0129] The sixth control module is used to acquire the second constant current value of the current discharge current and determine the second constant speed corresponding to the second constant current value when the battery system switches from constant current mode to variable current mode.

[0130] The seventh control module is used to control the speed of the first water pump and the second water pump to rotate at a second constant speed if the second constant current value is greater than the preset current value and the current value of the discharge current of the battery system gradually increases, and after a third preset time, control the second water pump to stop.

[0131] In some embodiments of this application, the discharge cooling control device 20 further includes:

[0132] The eighth control module is used to control the speed of the second water pump according to the discharge current value if the second constant current value is less than or equal to the preset current value and the discharge current value of the battery system gradually decreases, and to control the first water pump to rotate at the second constant speed, and to control the first water pump to stop after the fourth preset time.

[0133] The third preset duration is shorter than the fourth preset duration.

[0134] In some embodiments of this application, the formula for controlling the rotational speed of the first water pump based on the current value is as follows:

[0135]

[0136] Where V1 represents the rotational speed of the first water pump, T0 represents the temperature of the battery cell in the battery system, and T 11 The temperature of the inlet water connecting the battery water tank and the first water pump is represented by T. 21 This indicates the outlet temperature of the battery water tank connected to the coolant tank; I represents the discharge current value; and K represents the rotation coefficient.

[0137] The formula for controlling the speed of the second water pump based on the current value is as follows:

[0138]

[0139] Where V2 represents the rotational speed of the second water pump, and T 12 The temperature of the inlet water connecting the battery water tank and the second water pump is represented by T. 22 This indicates the temperature of the water outlet where the battery water tank connects to the second water pump.

[0140] Figure 4 This is a schematic diagram of the thermal management system provided in an embodiment of this application. Figure 4 As shown, the thermal management system 30 of this embodiment includes a processor 300 and a memory 301. The memory 301 stores a computer program 302 that can run on the processor 300. When the processor 300 executes the computer program 302, it implements the steps in the above-described embodiments of the discharge cooling control method for electric mining trucks. Alternatively, when the processor 300 executes the computer program 302, it implements the functions of each module / unit in the above-described device embodiments.

[0141] For example, computer program 302 can be divided into one or more modules / units, one or more of which are stored in memory 301 and executed by processor 300 to complete this application. One or more modules / units can be a series of computer program instruction segments capable of performing specific functions, which describe the execution process of computer program 302 in thermal management system 30.

[0142] The thermal management system 30 may include, but is not limited to, a processor 300 and a memory 301. Those skilled in the art will understand that... Figure 4 This is merely an example of the thermal management system 30 and does not constitute a limitation on the thermal management system 30. It may include more or fewer components than shown, or combine certain components, or different components. For example, the thermal management system may also include input / output devices, network access devices, buses, etc.

[0143] The processor 300 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0144] The memory 301 can be an internal storage unit of the thermal management system 30, such as a hard disk or RAM within the thermal management system 30. The memory 301 can also be an external storage device of the thermal management system 30, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card equipped on the thermal management system 30. Furthermore, the memory 301 can include both internal and external storage units of the thermal management system 30. The memory 301 is used to store computer programs and other programs and data required by the thermal management system. The memory 301 can also be used to temporarily store data that has been output or will be output.

[0145] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0146] This application also provides an electric mining truck, including the thermal management system 30 as described above.

[0147] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0148] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0149] In the embodiments provided in this application, it should be understood that the disclosed device / thermal management system and method can be implemented in other ways. For example, the device / thermal management system embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0150] 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 units can be selected to achieve the purpose of this embodiment according to actual needs.

[0151] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0152] If integrated modules / units are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium. When executed by a processor, the computer program can implement the steps of the discharge cooling control method embodiments of the various electric mining trucks described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc.

[0153] 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, and should all be included within the protection scope of this application.

Claims

1. A discharge cooling control method for an electric mining truck, characterized in that, The electric mining truck includes a battery system and a liquid cooling system. The battery system includes a battery water tank, and the liquid cooling system includes a coolant tank, a first water pump, and a second water pump. The coolant tank has one end connected to one end of the battery water tank and one end of the second water pump, and the other end connected to one end of the first water pump; the other end of the first water pump is connected to the other end of the battery water tank and the other end of the second water pump; wherein, the connection loop between the coolant tank, the first water pump and the battery water tank forms a large circulation loop, and the connection loop between the second water pump and the battery water tank forms a small circulation loop; The discharge cooling control method includes: When the battery system is in a discharging state, the current value of the discharge current of the battery system is obtained; When the current value is greater than a preset current value, the speed of the first water pump is controlled according to the current value, so that the flow rate of the coolant in the large circulation loop follows the change of the current value until the current value is less than or equal to the preset current value; wherein, the speed of the first water pump increases as the current value increases; the formula for controlling the speed of the first water pump according to the current value is: Where V1 represents the rotational speed of the first water pump, T0 represents the temperature of the battery cell in the battery system, and T 11 The temperature of the inlet water connecting the battery water tank and the first water pump is represented by T. 21 The outlet temperature of the battery water tank connected to the coolant tank is indicated; I represents the discharge current value; and K represents the rotation coefficient. When the current value is less than or equal to a preset current value, the speed of the second water pump is controlled according to the current value, so that the flow rate of the coolant in the small circulation loop follows the change of the current value until the current value is greater than the preset current value; wherein, the speed of the second water pump increases as the value of the current increases; the formula for controlling the speed of the second water pump according to the current value is: Where V2 represents the rotational speed of the second water pump, and T 12 The temperature of the inlet water connecting the battery water tank and the second water pump is represented by T. 22 This indicates the temperature of the water outlet connected to the battery water tank and the second water pump.

2. The discharge cooling control method for electric mining trucks according to claim 1, characterized in that, The battery system's discharge operating modes include a variable current mode and a constant current mode, and the cooling control method further includes: When the battery system switches from variable current mode to constant current mode, the first constant current value of the current discharge current is obtained, and the first constant speed corresponding to the first constant current value is determined. If the first constant current value is greater than the preset current value, the first water pump is controlled to rotate at the first constant speed, and after a first preset time, the first water pump is controlled to stop, and the second water pump is controlled to rotate at the first constant speed.

3. The discharge cooling control method for electric mining trucks according to claim 2, characterized in that, The cooling control method further includes: If the first constant current value is less than or equal to the preset current value, the second water pump is controlled to rotate at the first constant speed, and after a second preset time, the second water pump is controlled to stop, and the first water pump is controlled to rotate at the first constant speed. Wherein, the first preset duration is less than the second preset duration.

4. The discharge cooling control method for electric mining trucks according to claim 1, characterized in that, The battery system's discharge operating modes include a variable current mode and a constant current mode, and the discharge cooling control method further includes: When the battery system switches from constant current mode to variable current mode, the second constant current value of the current discharge current is obtained, and the second constant speed corresponding to the second constant current value is determined; If the second constant current value is greater than the preset current value, and the discharge current value of the battery system gradually increases, then the speed of the first water pump is controlled according to the discharge current value, and the second water pump is controlled to rotate at the second constant speed. After a third preset time, the second water pump is controlled to stop.

5. The discharge cooling control method for electric mining trucks according to claim 4, characterized in that, The discharge cooling control method further includes: If the second constant current value is less than or equal to the preset current value, and the discharge current value of the battery system gradually decreases, then the speed of the second water pump is controlled according to the discharge current value, and the first water pump is controlled to rotate at the second constant speed, and after a fourth preset time, the first water pump is controlled to stop. The third preset duration is less than the fourth preset duration.

6. A discharge cooling control device for an electric mining truck, characterized in that, The electric mining truck includes a battery system and a liquid cooling system. The battery system includes a battery water tank, and the liquid cooling system includes a coolant tank, a first water pump, and a second water pump. The coolant tank has one end connected to one end of the battery water tank and one end of the second water pump, and the other end connected to one end of the first water pump; the other end of the first water pump is connected to the other end of the battery water tank and the other end of the second water pump; wherein, the connection loop between the coolant tank, the first water pump and the battery water tank forms a large circulation loop, and the connection loop between the second water pump and the battery water tank forms a small circulation loop; The discharge cooling control device includes: The data acquisition module is used to acquire the current value of the discharge current of the battery system when the battery system is in a discharge state; A first control module is configured to control the speed of the first water pump according to the current value when the current value is greater than a preset current value, so that the flow rate of the coolant in the large circulation loop follows the change of the current value until the current value is less than or equal to the preset current value; wherein, the speed of the first water pump increases as the current value increases; the formula for controlling the speed of the first water pump according to the current value is: Where V1 represents the rotational speed of the first water pump, T0 represents the temperature of the battery cell in the battery system, and T 11 The temperature of the inlet water connecting the battery water tank and the first water pump is represented by T. 21 The outlet temperature of the battery water tank connected to the coolant tank is indicated; I represents the discharge current value; and K represents the rotation coefficient. The second control module is used to control the speed of the second water pump according to the current value when the current value is less than or equal to a preset current value, so that the flow rate of the coolant in the small circulation loop follows the change of the current value until the current value is greater than the preset current value; wherein, the speed of the second water pump increases as the value of the current increases; the formula for controlling the speed of the second water pump according to the current value is: Where V2 represents the rotational speed of the second water pump, and T 12 The temperature of the inlet water connecting the battery water tank and the second water pump is represented by T. 22 This indicates the temperature of the water outlet connected to the battery water tank and the second water pump.

7. A thermal management system, comprising a memory and a processor, wherein the memory stores a computer program executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the discharge cooling control method for the electric mining truck as described in any one of claims 1 to 5.

8. An electric mining truck, characterized in that, Includes the thermal management system as described in claim 7.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the discharge cooling control method for the electric mining truck as described in any one of claims 1 to 5.

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