A cooling method, device and medium for a battery pack of an engineering vehicle

Abstract

The present application discloses a method, device and medium for cooling a battery pack of an engineering vehicle, which is applied in a battery pack cooling system. The method includes: obtaining the battery temperature corresponding to the battery pack; if the battery temperature reaches a preset first temperature threshold, starting the water pump and conducting the low-temperature radiator branch; if the battery temperature reaches a preset second temperature threshold, turning on the cooling fan of the low-temperature radiator; if the battery temperature reaches a preset third temperature threshold, conducting the low-temperature radiator branch and the plate heat exchanger branch at the same time, so that the coolant passes through the low-temperature radiator branch and the plate heat exchanger branch to cool the battery pack. A variety of cooling methods are set for engineering vehicles. With a variety of cooling methods, it can flexibly face different working conditions and environmental conditions, realize intelligent adjustment and optimization, and ensure the balance of cooling effect and energy efficiency performance of the engineering vehicle battery system in different usage scenarios.

Description

Technical Field

[0001] The present application relates to the field of vehicle control, and in particular to a method, device and medium for cooling a battery pack of an engineering vehicle. Background Art

[0002] With the widespread use of electric engineering vehicles, thermal management of their battery systems has become increasingly important. Excessive battery temperature can lead to performance degradation, shortened life, and even safety risks. Therefore, battery cooling technology has become one of the key issues in engineering vehicle design.

[0003] At present, the existing battery cooling methods for engineering vehicles usually adopt a separate air or liquid cooling system, which is relatively simple in cooling methods and lacks intelligent adjustment and optimization for different working conditions and environmental conditions. This makes it easy to produce insufficient cooling effect or excessive energy consumption of the cooling system, making it difficult to balance the cooling effect and energy efficiency performance of the engineering vehicle battery system in different usage scenarios. Summary of the invention

[0004] In order to solve the above problems, the present application proposes a cooling method for a battery pack of an engineering vehicle, which is applied in a battery pack cooling system. The battery pack cooling system is arranged on an engineering vehicle, and the battery pack cooling system comprises: a water pump, a low-temperature radiator branch, and a plate heat exchanger branch; the water outlet of the water pump is connected to the inlet of the battery pack cooling pipeline, the low-temperature radiator branch is provided with a low-temperature radiator, and the plate heat exchanger branch is provided with a plate heat exchanger. The water outlets of the low-temperature radiator branch and the plate heat exchanger branch are connected to the water inlet of the water pump through a three-way valve, and the water inlets of the low-temperature radiator branch and the plate heat exchanger branch are both connected to the outlet of the battery pack cooling pipeline; the three-way valve is used to adjust the flow rate of the coolant in the low-temperature radiator branch and the plate heat exchanger branch, the low-temperature radiator is provided with a cooling fan, and the plate heat exchanger is used to make the plate heat exchanger branch perform heat exchange with the air conditioning circuit of the engineering vehicle;

[0005] The method comprises:

[0006] Obtaining a battery temperature corresponding to the battery pack;

[0007] If the battery temperature reaches a preset first temperature threshold, the water pump is started and the low-temperature radiator branch is turned on, so that the coolant passes through the low-temperature radiator branch to cool the battery pack;

[0008] If the battery temperature reaches a preset second temperature threshold that is higher than the first temperature threshold, turning on the cooling fan of the low-temperature radiator;

[0009] If the battery temperature reaches a preset third temperature threshold that is higher than the second temperature threshold, the low-temperature radiator branch and the plate heat exchanger branch are simultaneously turned on so that the coolant passes through the low-temperature radiator branch and the plate heat exchanger branch to cool the battery pack.

[0010] On the other hand, the present application also proposes a cooling device for a battery pack of an engineering vehicle, comprising:

[0011] at least one processor; and,

[0012] a memory communicatively connected to the at least one processor; wherein,

[0013] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the engineering vehicle battery pack cooling method as described in the above example.

[0014] On the other hand, the present application also proposes a non-volatile computer storage medium storing computer executable instructions, wherein the computer executable instructions are configured as: the engineering vehicle battery pack cooling method described in the above example.

[0015] The cooling method for the engineering vehicle battery pack proposed in this application can bring the following beneficial effects:

[0016] A variety of cooling methods are set up for engineering vehicles, and the branches and loops of the various cooling methods are integrated into the same system. When the battery pack cooling system is actually working, the cooling methods with stronger heat dissipation and cooling capabilities and higher energy consumption are started in sequence according to the temperature of the battery. In an environment with low cooling requirements, a cooling method with lower energy consumption is adopted to reduce the occurrence of excessive energy consumption in this scenario; in an environment with high cooling requirements, a cooling method with higher energy consumption is adopted to ensure the cooling effect in this scenario. With a variety of cooling methods, we can flexibly deal with different working conditions and environmental conditions, realize intelligent adjustment and optimization, and ensure the balance of cooling effect and energy efficiency performance of the engineering vehicle battery system in different usage scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 This is a schematic diagram of a process for cooling a battery pack of an engineering vehicle in an embodiment of the present application;

[0019] Figure 2 This is a schematic diagram of the architecture of the battery pack cooling system in an embodiment of the present application;

[0020] Figure 3 This is a schematic diagram of a cooling device for a battery pack of an engineering vehicle in an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0022] The technical solutions provided by various embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0023] like Figure 1 As shown, an embodiment of the present application provides a method for cooling a battery pack of an engineering vehicle, which is applied in a battery pack cooling system.

[0024] The battery pack cooling system is installed on engineering vehicles. Engineering vehicles generally refer to special vehicles and mechanical equipment used for construction, infrastructure construction and other heavy engineering projects, which may include excavators, bulldozers, cranes, rollers, etc., and the battery pack cooling system is usually installed on the side or corresponding position of the main body of the engineering vehicle.

[0025] like Figure 2 As shown, the battery pack cooling system includes: a water pump, a low-temperature radiator branch, and a plate heat exchanger branch. When there are multiple battery packs, a corresponding number of water pumps are provided, and the water outlet of the water pump is connected to the inlet of the battery pack cooling pipeline. The low-temperature radiator branch is provided with a low-temperature radiator, and the plate heat exchanger branch is provided with a plate heat exchanger. The low-temperature radiator is provided with a cooling fan, and the plate heat exchanger is used to exchange heat between the plate heat exchanger branch and the air conditioning circuit of the engineering vehicle.

[0026] The water outlets of the low-temperature radiator branch and the plate heat exchanger branch are connected to the water inlet of the water pump through a three-way valve, and the water inlets of the low-temperature radiator branch and the plate heat exchanger branch are connected to the outlet of the battery pack cooling pipeline. The three-way valve is used to adjust the flow of the coolant in the low-temperature radiator branch and the plate heat exchanger branch.

[0027] The water pump is used to supply a coolant at room temperature (for example, it can be water or other liquids with corresponding capacity). When the coolant passes through the battery pack, the coolant and the battery pack are heat exchanged by heat exchange, thereby dissipating heat from the battery pack. The coolant after heat exchange is cooled by air through the fan of the low-temperature radiator and / or by heat exchange through the plate heat exchanger, so that after the coolant is cooled, it flows back to the water pump and is used again to dissipate heat from the battery pack.

[0028] like Figure 1 As shown, the method includes:

[0029] S101: Obtain the battery temperature corresponding to the battery pack.

[0030] Here, the battery pack temperature can be detected by a temperature sensor or a corresponding temperature detection device, and the battery temperature can include the maximum temperature and average temperature of the battery pack. In the subsequent detection process, when determining the battery temperature, corresponding temperature thresholds can be set for the maximum temperature and the average temperature, respectively. According to the actual objective situation, when one of the two reaches the corresponding temperature threshold, or both reach the corresponding temperature threshold, it is considered that the battery temperature reaches the corresponding temperature threshold.

[0031] S102: If the battery temperature reaches a preset first temperature threshold, the water pump is started and the low-temperature radiator branch is turned on, so that the coolant passes through the low-temperature radiator branch to cool the battery pack.

[0032] Based on objective factors such as the different materials of the battery pack, production process, configuration position in the engineering vehicle, connection relationship with other circuits, working status of the engineering vehicle (including working years, working environment, etc.), etc., each temperature threshold including the first temperature threshold can be set and adjusted accordingly to adapt to the actual objective situation. For example, the first temperature threshold is set between 20° and 25° to ensure the normal operation of the battery pack.

[0033] After the water pump is started, the coolant reaches the battery pack through the pipeline, exchanges heat with the battery pack, heats up the coolant, and cools the battery pack. The coolant flows along the low-temperature radiator branch, exchanges heat with the air, and then returns to the water pump to be used again to cool and dissipate heat for the battery pack.

[0034] S103: If the battery temperature reaches a preset second temperature threshold that is higher than the first temperature threshold, turning on a cooling fan of the low-temperature radiator.

[0035] If after the above heat dissipation process, the battery temperature still rises and reaches the second temperature threshold (for example, it can be set between 23° and 28°), it means that the above cooling and heat dissipation method is no longer sufficient to support the heat dissipation of the battery pack. At this time, the cooling fan of the low-temperature radiator is started to blow the coolant flowing into the low-temperature radiator branch. Although it increases energy consumption, it accelerates the heat dissipation of the coolant, thereby making the temperature of the coolant returning to the water pump lower, which can increase the cooling capacity of the coolant on the battery pack.

[0036] S104: If the battery temperature reaches a preset third temperature threshold that is higher than the second temperature threshold, the low-temperature radiator branch and the plate heat exchanger branch are simultaneously turned on so that the coolant passes through the low-temperature radiator branch and the plate heat exchanger branch to cool the battery pack.

[0037] Similarly, if the battery temperature continues to rise and reaches the third temperature threshold (for example, it can be set between 27° and 30°), it means that the above-mentioned cooling and heat dissipation method is no longer sufficient to support the heat dissipation of the battery pack, and the low-temperature radiator branch and the plate heat exchanger branch are turned on at the same time. At this time, part of the coolant still passes through the low-temperature radiator branch, and the heat is dissipated by wind using a heat dissipation fan in the air, and the other part passes through the plate heat exchanger branch, and the coolant is cooled by heat exchange in the plate heat exchanger.

[0038] Among them, the plate heat exchanger includes at least two channels, one of which is used to pass the coolant (for the convenience of description, referred to as the first coolant) for dissipating heat to the battery pack, and the other channel is used to pass the coolant generated in the air-conditioning circuit (for the convenience of description, referred to as the second coolant). The temperature of the second coolant is lower than that of the first coolant, so the first coolant can be cooled by heat exchange.

[0039] like Figure 2 As shown, the air conditioning circuit includes a compressor, a condenser, an electronic expansion valve and an evaporator. The condenser can be arranged close to the low-temperature radiator so that the cooling fan can also dissipate heat from the condenser simultaneously. Two electronic expansion valves can be arranged, one on the branch corresponding to the plate heat exchanger and the other on the evaporator. Through the cooperation between the various devices in the air conditioning circuit, a refrigeration cycle can be realized, and a second coolant with a lower temperature can be generated to cool the first coolant.

[0040] Furthermore, if the low-temperature radiator branch and the plate heat exchanger branch are connected at the same time by controlling the three-way valve, the flow of coolant in the low-temperature radiator branch and the plate heat exchanger branch can be further adjusted based on actual conditions by controlling the three-way valve.

[0041] Among them, if the battery temperature is higher, it means that the cooling capacity required for the current battery pack is higher. In the plate heat exchanger branch, the cooling capacity of the coolant generated by the air-conditioning circuit is stronger than the cooling capacity of the heat dissipation of the low-temperature radiator. At this time, the highest priority should be considered to be the cooling capacity of the battery pack, rather than the energy consumption problem. Therefore, by controlling the three-way valve, the flow rate in the plate heat exchanger branch is adjusted to be higher. Although it increases energy consumption, it ensures the battery temperature of the battery pack and ensures the normal operation of the engineering vehicle.

[0042] A variety of cooling methods are set up for engineering vehicles, and the branches and loops of the various cooling methods are integrated into the same system. When the battery pack cooling system is actually working, the cooling methods with stronger heat dissipation and cooling capabilities and higher energy consumption are started in sequence according to the temperature of the battery. In an environment with low cooling requirements, a cooling method with lower energy consumption is adopted to reduce the occurrence of excessive energy consumption in this scenario; in an environment with high cooling requirements, a cooling method with higher energy consumption is adopted to ensure the cooling effect in this scenario. With a variety of cooling methods, we can flexibly deal with different working conditions and environmental conditions, realize intelligent adjustment and optimization, and ensure the balance of cooling effect and energy efficiency performance of the engineering vehicle battery system in different usage scenarios.

[0043] In one embodiment, during the operation of the engineering vehicle, after the corresponding cooling method is started, the temperature of the battery pack may decrease due to the cooling of the cooling method or due to changes in external conditions (for example, the working intensity of the engineering vehicle decreases, the external temperature decreases, etc.), and gradually decreases to a safe temperature. At this time, the corresponding cooling method can be shut down.

[0044] Specifically, assuming that the cooling mode corresponding to the plate heat exchanger branch is turned on, if the battery temperature drops to a preset fourth temperature threshold, the plate heat exchanger branch is turned off. The fourth temperature threshold is not higher than the third temperature threshold, for example, the fourth temperature threshold is slightly lower than the third temperature threshold (lower than 2°~3°).

[0045] Assuming that the cooling fan of the low-temperature radiator is turned on, if the battery temperature drops to a preset fifth temperature threshold, the cooling fan of the low-temperature radiator is turned off. The fifth temperature threshold is not higher than the second temperature threshold and lower than the fourth temperature threshold, for example, the fifth temperature threshold is slightly lower than the second temperature threshold (lower than 2°~3°).

[0046] Assuming that the water pump is turned on, if the battery temperature reaches a preset sixth temperature threshold, the water pump is turned off; wherein the sixth temperature threshold is not higher than the first temperature threshold and is lower than the fifth temperature threshold, for example, the sixth temperature threshold is slightly lower than the first temperature threshold (lower than 2°~3°).

[0047] In one embodiment, different working environments have different effects on the cooling and heat dissipation of engineering vehicles. For example, if the external ambient temperature is very low, even if the current temperature of the battery pack is high and has reached the temperature threshold for starting the plate heat exchanger branch, the low-temperature radiator mainly relies on heat exchange with the air, and the cooling fan increases the efficiency of the heat exchange. Therefore, at this time, the cooling and heat dissipation of the battery pack can actually be achieved through the cooperation between the external low-temperature environment and the cooling fan.

[0048] Based on this, when the battery temperature reaches the third temperature threshold, the plate heat exchanger branch is not immediately turned on, but the ambient temperature of the current environment of the engineering vehicle is obtained.

[0049] If the ambient temperature is lower than the preset seventh temperature threshold (which is set based on actual conditions, generally, the seventh temperature threshold is lower than the third temperature threshold, and there is a certain temperature difference between the two, for example, the temperature difference is 5°~10°), then the estimated remaining working time of the engineering vehicle is determined based on the task plan of the engineering vehicle. Generally speaking, the daily engineering schedule of the engineering vehicle is relatively fixed, so the corresponding estimated remaining working time can be inferred.

[0050] If the estimated remaining working time is lower than the first preset time (which can be set based on actual conditions, for example, set to 10 minutes to 30 minutes), it is considered that the engineering vehicle is about to finish work, and during the remaining period of time, the low temperature environment outside can maintain the battery pack working at a relatively healthy temperature. At this time, the third temperature threshold is raised, and the increase is negatively correlated with the ambient temperature and the remaining working time. The lower the ambient temperature, the stronger the cooling capacity of the cooling fan, so the third temperature threshold can be increased. The lower the remaining working time, it is considered that the third temperature threshold of the battery temperature of the battery pack when working for a short time can be adaptively adjusted upward, and the third temperature threshold can be increased. In this way, according to the actual objective situation, the startup of the air-conditioning circuit is reduced, thereby saving energy consumption.

[0051] At the same time, after raising the third temperature threshold, the speed of the cooling fan of the low-temperature cooling module can also be raised synchronously to achieve higher intensity cooling through the low-temperature radiator. Similarly, the increase is negatively correlated with the real-time speed of the engineering vehicle. The slower the real-time speed, the higher the increase can be. In this way, energy consumption can be saved while ensuring the cooling effect through the low-temperature radiator.

[0052] Of course, if the battery temperature reaches the third temperature threshold after the adjustment, the plate heat exchanger branch is turned on to cool the battery pack, with the highest priority being to ensure the health of the battery pack.

[0053] In one embodiment, after the plate heat exchanger branch is turned on, the air conditioning circuit is put into operation. At this time, the compressor efficiency map of the compressor is obtained, and the outlet water temperature of the battery pack cooling pipeline outlet is obtained. Among them, the compressor efficiency map is used to describe the isoquant curve formed by multiple compressor operating parameters (such as the refrigerant flow rate of the compressor, the operating pressure ratio, etc.) for the cooling capacity of the compressor. The isoquant curve means that the operating parameters on this line may be different, but the cooling capacity finally achieved is the same. The outlet water temperature represents the temperature reached by the coolant after the heat exchange with the battery pack.

[0054] Determine a plurality of pre-divided water temperature intervals (for example, one water temperature interval is divided every 2°) and a plurality of cooling capacity intervals (which are set based on actual conditions, for example, one cooling capacity interval is divided every 5% of the maximum cooling capacity); wherein each water temperature interval corresponds to a cooling capacity interval, and the value of the water temperature interval is positively correlated with the value of the cooling capacity interval. In other words, the higher the value of the water temperature interval, the higher the value of the required cooling capacity interval.

[0055] At this time, according to the set correspondence, the corresponding cooling capacity interval is determined according to the water temperature interval where the outlet water temperature is located. And according to the compressor efficiency map, the adapted compressor operating parameters are selected in the cooling capacity interval to control the compressor operation.

[0056] Among them, the adapted compressor operating parameters are determined based on the energy consumption corresponding to the compressor operating parameters. Each compressor operating parameter is related to the compressor energy consumption, and the degree of correlation is also different. For example, when the refrigerant flow of the compressor increases, the compressor energy consumption increases slowly, and when the operating pressure ratio increases, the compressor energy consumption increases quickly. Here, the relationship between each compressor operating parameter and energy consumption can be obtained in advance through experiments. At this time, among the isoquant curves corresponding to the cooling capacity interval, a combination of multiple compressor operating parameters with the lowest total energy consumption is selected as the adapted compressor operating parameter, thereby saving energy consumption when the compressor is working.

[0057] Furthermore, after the compressor is started, if the outlet water temperature reaches a higher temperature range, the compressor cooling capacity is not changed immediately. Compared with the constantly changing compressor operating parameters, stable compressor operating parameters can effectively reduce energy consumption.

[0058] Therefore, only when the outlet water temperature reaches a higher temperature range and lasts for more than a second preset time (which can be set based on actual conditions, for example, 30 seconds to 1 minute), the estimated remaining working time of the engineering vehicle can be further determined based on the task plan of the engineering vehicle.

[0059] If the estimated remaining working time is higher than the first preset time, it means that the current engineering vehicle still needs to work for a period of time. At this time, the working capacity of the engineering vehicle is considered as the highest priority. The cooling capacity of the compressor is changed to the cooling capacity range corresponding to the higher temperature water temperature range to ensure the cooling capacity of the battery pack.

[0060] If the estimated remaining working time is lower than the first preset time, it means that the current work is about to end, and the cooling capacity of the compressor can be kept unchanged, thereby reducing the energy consumption caused by the compressor.

[0061] Of course, if the outlet water temperature does not reach a higher temperature range, it means that the current operation of the engineering vehicle is relatively stable, and the estimated remaining working time is lower than the first preset time, which means that the current work of the engineering vehicle is about to end. Based on the preset reduction speed, the cooling capacity of the compressor can be gradually reduced to the cooling capacity range corresponding to the lower temperature range. For example, the refrigerant flow rate can be gradually reduced or the operating pressure ratio can be gradually reduced, thereby reducing the energy consumption caused by the compressor.

[0062] In one embodiment, for an engineering vehicle, its own load capacity and working environment are relatively fixed, and therefore, the cumulative output energy of the battery pack within the third preset time period in the future can be obtained based on the load capacity and future driving road conditions. Generally speaking, the higher the load capacity and the more complex the future driving road conditions (including undulating terrain), the higher the cumulative output energy of the battery pack. The calculation relationship between the specific values ​​can be obtained by conducting experiments on each battery pack.

[0063] If the cumulative output energy is greater than the preset energy threshold, it means that the battery pack is likely to generate a lot of heat in the future. Therefore, by lowering the second temperature threshold, the cooling fan is used in advance to lower the battery temperature, so that the battery temperature will not be too high in the future. This can not only ensure the healthy working state of the battery pack, but also reduce the use of the compressor and reduce energy consumption. Among them, the cumulative output energy is positively correlated with the reduction of the second temperature threshold, that is, the higher the cumulative output energy, the higher the reduction of the second temperature threshold, and the earlier the battery pack can be cooled.

[0064] like Figure 3 As shown, the embodiment of the present application also proposes a cooling device for a battery pack of an engineering vehicle, comprising:

[0065] at least one processor; and,

[0066] a memory communicatively connected to the at least one processor; wherein,

[0067] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the engineering vehicle battery pack cooling method as described in any of the above embodiments.

[0068] The embodiment of the present application also proposes a non-volatile computer storage medium storing computer executable instructions, wherein the computer executable instructions are configured as: the engineering vehicle battery pack cooling method described in any of the above embodiments.

[0069] Each embodiment in this application is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device and medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments.

[0070] The devices and media provided in the embodiments of the present application correspond one-to-one to the methods. Therefore, the devices and media also have similar beneficial technical effects as the corresponding methods. Since the beneficial technical effects of the methods have been described in detail above, the beneficial technical effects of the devices and media will not be repeated here.

[0071] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0072] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0073] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0074] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0075] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0076] Memory may include non-permanent storage in a computer-readable medium, in the form of random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

[0077] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0078] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0079] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A method for cooling a battery pack of an engineering vehicle, characterized in that: Applied in a battery pack cooling system, the battery pack cooling system is arranged on an engineering vehicle, and the battery pack cooling system comprises: a water pump, a low-temperature radiator branch, and a plate heat exchanger branch; the water outlet of the water pump is connected to the inlet of the battery pack cooling pipeline, the low-temperature radiator branch is provided with a low-temperature radiator, the plate heat exchanger branch is provided with a plate heat exchanger, the water outlets of the low-temperature radiator branch and the plate heat exchanger branch are connected to the water inlet of the water pump through a three-way valve, and the water inlets of the low-temperature radiator branch and the plate heat exchanger branch are both connected to the outlet of the battery pack cooling pipeline; the three-way valve is used to adjust the flow of coolant in the low-temperature radiator branch and the plate heat exchanger branch, the low-temperature radiator is provided with a cooling fan, and the plate heat exchanger is used to make the plate heat exchanger branch perform heat exchange with the air conditioning circuit of the engineering vehicle; The method comprises: Obtaining a battery temperature corresponding to the battery pack; If the battery temperature reaches a preset first temperature threshold, the water pump is started and the low-temperature radiator branch is turned on, so that the coolant passes through the low-temperature radiator branch to cool the battery pack; If the battery temperature reaches a preset second temperature threshold that is higher than the first temperature threshold, turning on the cooling fan of the low-temperature radiator; If the battery temperature reaches a preset third temperature threshold that is higher than the second temperature threshold, the low-temperature radiator branch and the plate heat exchanger branch are simultaneously turned on, so that the coolant passes through the low-temperature radiator branch and the plate heat exchanger branch to cool the battery pack; The air conditioning circuit at least includes a compressor, a condenser, an electronic expansion valve and an evaporator; Before simultaneously conducting the low-temperature radiator branch and the plate heat exchanger branch, the method further includes: Obtaining the ambient temperature of the current environment of the engineering vehicle; If the ambient temperature is lower than a preset seventh temperature threshold, determining an estimated remaining working time of the engineering vehicle based on a mission plan of the engineering vehicle; If the estimated remaining working time is lower than the first preset time, the third temperature threshold is increased, and the increase is negatively correlated with the ambient temperature and the remaining working time; Increase the speed of the cooling fan of the low-temperature radiator branch, and the increase amplitude is negatively correlated with the real-time speed of the engineering vehicle; If the battery temperature reaches the third temperature threshold after being adjusted higher, opening the plate heat exchanger branch; After the plate heat exchanger branch is turned on, the method further includes: Obtaining a compressor efficiency map of the compressor, and obtaining the outlet water temperature of the battery pack cooling pipeline outlet; wherein the compressor efficiency map is used to describe an isoquant curve formed by multiple compressor operating parameters on the refrigeration capacity of the compressor; Determine a plurality of pre-divided water temperature intervals and a plurality of cooling capacity intervals; wherein each water temperature interval corresponds to a cooling capacity interval, and the value of the water temperature interval is positively correlated with the value of the cooling capacity interval; According to the water temperature range in which the outlet water temperature is located, the corresponding refrigeration capacity range is determined, and according to the compressor efficiency map, the adapted compressor operating parameters are selected in the refrigeration capacity range to control the operation of the compressor; wherein the adapted compressor operating parameters are determined based on the energy consumption corresponding to the compressor operating parameters; the operating parameters include refrigerant flow rate and operating pressure ratio; The method further comprises: If the outlet water temperature reaches a higher temperature range and lasts for longer than a second preset time, then based on the mission plan of the engineering vehicle, determining the estimated remaining working time of the engineering vehicle; If the estimated remaining working time is higher than the first preset time, the cooling capacity of the compressor is changed to the cooling capacity range corresponding to the higher temperature water temperature range; If the estimated remaining working time is less than the first preset time, keeping the refrigeration capacity range of the compressor unchanged; If the outlet water temperature does not reach the higher temperature water temperature range, and the estimated remaining working time is lower than the first preset time, then based on a preset reduction speed, gradually reduce the cooling capacity of the compressor to the cooling capacity range corresponding to the lower temperature water temperature range; The method further comprises: Based on the load and the future driving road conditions, obtaining the cumulative output energy of the battery pack within a third preset time period in the future; If the cumulative output energy is greater than a preset energy threshold, the second temperature threshold is reduced; wherein the cumulative output energy is positively correlated with the reduction amplitude of the second temperature threshold.

2. The method according to claim 1, characterized in that The low-temperature radiator branch and the plate heat exchanger branch are simultaneously turned on, specifically comprising: By controlling the three-way valve, the low-temperature radiator branch and the plate heat exchanger branch are simultaneously connected, and the flow of coolant in the low-temperature radiator branch and the plate heat exchanger branch is adjusted; wherein, the higher the battery temperature, the higher the flow in the plate heat exchanger branch.

3. The method according to claim 1, characterized in that The method further comprises: If the battery temperature reaches a preset fourth temperature threshold, closing the plate heat exchanger branch, wherein the fourth temperature threshold is not higher than the third temperature threshold; If the battery temperature reaches a preset fifth temperature threshold, the cooling fan of the low-temperature radiator is turned off; wherein the fifth temperature threshold is not higher than the second temperature threshold and is lower than the fourth temperature threshold; If the battery temperature reaches a preset sixth temperature threshold, the water pump is turned off; wherein the sixth temperature threshold is not higher than the first temperature threshold and is lower than the fifth temperature threshold.

4. A cooling device for a battery pack of an engineering vehicle, characterized in that: include: at least one processor; as well as, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the engineering vehicle battery pack cooling method as described in any one of claims 1 to 3.

5. A non-volatile computer storage medium storing computer executable instructions, characterized in that: The computer executable instructions are set to: the engineering vehicle battery pack cooling method according to any one of claims 1 to 3.

Images