Large-tonnage high-voltage lithium battery forklift cooling control system, and control method therefor

Abstract

A large-tonnage high-voltage lithium battery forklift cooling control system, and a control method therefor. The system comprises a drive assembly (1), a pump assembly (12), a hydraulic oil tank assembly (3), an integrated triple-radiator (8), an electronic fan (19), a drive assembly cooling unit, a pump assembly cooling unit, a hydraulic oil cooling unit, a controller and a temperature sensor. For a high-performance large-tonnage high-voltage lithium battery forklift, according to different working temperature requirements of motors, electric control units and hydraulic oil, a heat dissipation system is divided into three circulating cooling systems, i.e. a drive cooling system, a pump cooling system and a hydraulic oil cooling system, which are subject to the integrated triple-radiator (8) for centralized heat dissipation. Thus, two water cooling control systems, i.e. a drive water cooling control system and a pump water cooling control system, and one oil cooling system are built for the large-tonnage high-voltage lithium battery forklift, thereby forming an accurately energy-saving, reliable and stable cooling control system, which allows the motors, the electric control units and the hydraulic oil to all work at a proper temperature, and has the advantages of simple pipe connection, control logic easy to implement, and low energy consumption requirements.

Description

A cooling control system and control method for a large-tonnage high-voltage lithium-ion forklift Technical Field

[0001] The present invention relates to the technical field of forklift cooling control, and in particular to a cooling control system and a control method for a large-tonnage high-voltage lithium battery forklift. Background Art

[0002] Electric forklifts between 4 and 10 tons are generally considered large-tonnage. Existing large-tonnage electric forklifts generally utilize an 80V voltage platform. Both the drive and pump control motors are three-phase asynchronous AC motors, primarily using air-cooled and natural cooling. Limited by the 80V voltage platform, existing performance indicators suffer from high current draw and high temperature rise, leaving little room for further improvement in the motor and electronic control systems. Furthermore, domestically available motors suitable for the 80V platform are limited, and there are no highly adaptable motors available to enhance the performance of existing vehicles.

[0003] Based on a 350V voltage platform and equipped with a permanent magnet synchronous water-cooled motor power system, high-voltage lithium-ion forklifts offer significantly improved performance compared to existing 80V forklifts, rivaling those of internal combustion forklifts. The motor and electronic control resources are based on a mature domestic high-voltage commercial vehicle platform, offering a wide range of resources and options. Large-tonnage high-voltage lithium-ion forklifts require one drive motor, two pump motors, one drive electronic control unit (ECU), and two pump control ECUs. The drive assembly consists of one drive motor and one ECU, while the pump assembly consists of two pump motors and two pump control ECUs. However, this improved performance also raises the issue of excessive hydraulic oil temperatures. To maintain the hydraulic system at a suitable operating temperature and reduce wear on hydraulic components, hydraulic oil heat dissipation is essential. The large number of components requiring heat dissipation and the varying temperature requirements of each system present significant challenges in the layout and control design of the cooling system. Summary of the Invention

[0004] Based on this, in order to solve the technical problem that large-tonnage high-voltage lithium-ion forklifts have many components that need to dissipate heat and the temperature requirements of each system are different, which brings great challenges to the layout design and control design of the cooling system, a large-tonnage high-voltage lithium-ion forklift cooling control system and a control method are provided.

[0005] The present invention provides a large-tonnage high-voltage lithium-ion forklift cooling control system, which includes a drive assembly, a pump assembly, and a hydraulic oil tank assembly; it also includes:

[0006] An integrated triple radiator with a drive cooling chamber, a pump cooling chamber, and a hydraulic oil cooling chamber;

[0007] an electronic fan, which is mounted on the integrated triple radiator and is used to dissipate heat from the integrated triple radiator;

[0008] The drive assembly cooling unit is used to cool the drive assembly and includes an electronic water pump, a cooling water inlet pipe, and a cooling water return pipe. The water inlet of the electronic water pump is connected to the drive cooling chamber. One end of the cooling water inlet pipe is connected to the water outlet of the electronic water pump and the other end is connected to the water inlet of the drive assembly. One end of the cooling water return pipe is connected to the water outlet of the drive assembly and the other end is connected to the drive cooling chamber.

[0009] A pump assembly cooling unit, which is used to cool the pump assembly, comprises a second electronic water pump, a second cooling water inlet pipe, and a second cooling water return pipe; the water inlet of the second electronic water pump is connected to the pump cooling chamber; one end of the second cooling water inlet pipe is connected to the water outlet of the second electronic water pump and the other end thereof is connected to the water inlet of the pump assembly; one end of the second cooling water return pipe is connected to the water outlet of the pump assembly and the other end thereof is connected to the pump cooling chamber;

[0010] The hydraulic oil cooling unit is used to cool the hydraulic oil in the hydraulic oil tank assembly and includes a gear pump, a hydraulic oil inlet cooling pipe, and a hydraulic oil return cooling pipe. The oil outlet of the gear pump is connected to the hydraulic oil tank. One end of the hydraulic oil return cooling pipe is connected to the hydraulic oil tank and the other end is connected to the hydraulic oil cooling chamber. One end of the hydraulic oil inlet cooling pipe is connected to the hydraulic oil cooling chamber and the other end is connected to the oil inlet of the gear pump.

[0011] A controller connected to the electronic fan, the first electronic water pump, the second electronic water pump, and the gear pump;

[0012] and a temperature detector for detecting the temperature T of the drive assembly and the pump assembly in real time;

[0013] The controller is used to: control the operation of electronic water pump 1 and / or electronic water pump 2 when the temperature T of the drive assembly or the pump assembly is greater than a preset temperature T1; control the operation of the electronic fan and adjust the speed of the electronic fan when the temperature T of the drive assembly or the pump assembly is greater than a preset temperature T2; wherein the preset temperature T1 is lower than the preset temperature T2.

[0014] As a further improvement of the above solution, the hydraulic oil cooling unit further includes:

[0015] The oil outlet of the steering gear is connected to the oil inlet of the gear pump through a pipeline, and the oil inlet is connected to one end of the hydraulic oil return cooling pipe.

[0016] As a further improvement of the above solution, in the integrated triple radiator, the drive cooling chamber, the pump cooling chamber, and the hydraulic oil cooling chamber are arranged in sequence from top to bottom.

[0017] As a further improvement to the above solution, the cooling control system for large-tonnage high-voltage lithium-ion forklift trucks further includes:

[0018] An expansion water tank is installed on the top of the integrated triple radiator and is provided with a liquid filling port on the top;

[0019] a connecting pipe 1, one end of which is connected to the expansion water tank and the other end of which is connected to the drive cooling chamber;

[0020] A connecting pipe 2, one end of which is connected to the expansion water tank and the other end of which is connected to the pump cooling chamber; and a liquid filling cap, which is connected to the liquid filling port to seal the liquid filling port.

[0021] As a further improvement of the above solution, a transparent liquid viewing window is also provided on the expansion water tank.

[0022] As a further improvement of the above scheme, the integrated triple radiator includes three plate-fin boxes arranged in sequence from top to bottom. The top plate-fin box forms a drive cooling chamber, the middle plate-fin box forms a pump cooling chamber, and the bottom plate-fin box forms a hydraulic oil cooling chamber.

[0023] As a further improvement to the above solution, the cooling control system for large-tonnage high-voltage lithium-ion forklift trucks further includes:

[0024] The wind cover is arranged outside the electronic fan and installed on the integrated triple radiator.

[0025] As a further improvement of the above solution, the drive assembly includes a drive motor and a drive electronic control unit, and the pump assembly includes a pump motor and a pump control electronic control unit; the temperature detector is used to detect the temperature T of the drive motor in real time. a , the temperature of the drive electronic control unit T b , Pump motor temperature T c , the temperature of the pump control electronic control unit T d ; The controller is used to:

[0026] When the temperature of the drive motor T a Greater than a preset temperature T 1a When, or when the temperature of the drive electronic control unit T b Greater than a preset temperature T 1b When the electronic water pump is controlled to run; where: T 1a Greater than T 1b ;

[0027] When the pump motor temperature T c Greater than the preset temperature T 1a When, or when the temperature T of the pump control electronic control unit d Greater than the preset temperature T 1b When , the electronic water pump 2 is controlled to run;

[0028] When the temperature of the drive motor T a / Pump motor temperature T cGreater than a preset temperature T 2a When, or when the temperature of the drive electronic control unit T b / Temperature of the pump control electronic control unit T d Greater than a preset temperature T 2b When the electronic fan is running, the electronic fan is controlled and the speed of the electronic fan is adjusted; where: T 2a Greater than T 2b , T 2a Greater than T 1a , T 2b Greater than T 1b .

[0029] The present invention provides a cooling control method for a large-tonnage high-voltage lithium-ion forklift, which adopts the large-tonnage high-voltage lithium-ion forklift cooling control system as described above, and includes the following steps:

[0030] Get the temperature T of the drive assembly and pump assembly;

[0031] When the temperature T of the drive assembly and / or the pump assembly is greater than a preset temperature T1, the electronic water pump 1 and / or the electronic water pump 2 is controlled to operate;

[0032] When the temperature T of the drive assembly and / or the pump assembly is greater than a preset temperature T2, the electronic fan is controlled to operate and the speed of the electronic fan is adjusted;

[0033] The preset temperature T1 is lower than the preset temperature T2.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The present invention is aimed at high-performance, large-tonnage, high-voltage lithium-ion forklifts. According to the different operating temperature requirements of the motor, electronic control, and hydraulic oil, that is, according to the different heat dissipation powers of the drive assembly, pump assembly, and hydraulic oil tank assembly, the heat dissipation system is divided into a three-way circulating cooling system based on calculation and empirical design, namely, one way for drive cooling, one way for pump cooling, and one way for hydraulic oil cooling. The heat is concentrated by an integrated triple radiator, realizing the construction of a two-way water cooling and one-way oil cooling control system for the drive and pump of large-tonnage, high-voltage lithium-ion forklifts, forming a precise, energy-saving, reliable and stable cooling control system, which not only meets the requirements of the motor, electronic control, and hydraulic oil working at an appropriate temperature, but also has the advantages of simple pipeline connection, easy implementation of control logic, and low energy consumption demand, realizing the construction of the cooling control system logic of large-tonnage, high-voltage lithium-ion forklifts.

[0036] 2. The drive assembly cooling unit and pump assembly cooling unit of the present invention directly utilize the pipelines integrated inside the drive assembly and pump assembly to realize the integrated cooling structure of the motor and electronic control. No additional internal connecting pipelines are required for the entire vehicle. Compared with the traditional 80V vehicle where the motor and electronic control are arranged separately, the water pipeline layout of the entire vehicle can be greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG1 is a schematic structural diagram of a cooling control system for a large-tonnage high-voltage lithium-ion forklift provided by an embodiment of the present invention;

[0038] FIG2 is a schematic structural diagram of the drive assembly in FIG1 ;

[0039] FIG3 is a schematic structural diagram of the pump assembly in FIG1 ;

[0040] FIG4 is a schematic structural diagram of the integrated triple radiator in FIG1 ;

[0041] FIG5 is a schematic structural diagram of the electronic water pump 1 in FIG1 ;

[0042] FIG6 is a schematic structural diagram of the electronic water pump 2 in FIG1 .

[0043] Figure numerals: 1. Drive assembly; 2. Steering gear; 3. Hydraulic oil tank assembly; 4. Hydraulic oil return cooling pipe; 5. Cooling water inlet pipe 1; 6. Cooling water inlet pipe 2; 7. Electronic water pump 1; 8. Integrated triple radiator; 9. Cooling return water pipe 1; 10. Cooling return water pipe 2; 11. Hydraulic oil inlet cooling pipe; 12. Pump assembly; 13. Hydraulic oil cooling chamber; 14. Pump cooling chamber; 15. Drive cooling chamber; 16. Liquid filling cap; 17. Liquid viewing window; 18. Expansion tank; 19. Electronic fan; 20. Wind hood; 21. Electronic water pump 2; 22. Connecting pipe 1; 23. Connecting pipe 2. Modes for Carrying Out the Invention

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] This embodiment addresses the technical challenges posed by the numerous components requiring heat dissipation in current large-tonnage, high-voltage lithium-ion battery forklifts, each with its own varying temperature requirements, which pose significant challenges to the layout and control design of the cooling system. The present embodiment provides a cooling control system for large-tonnage, high-voltage lithium-ion battery forklifts. Referring to FIG1 , the cooling control system for large-tonnage, high-voltage lithium-ion battery forklifts comprises a drive assembly 1, a pump assembly 12, a hydraulic oil tank assembly 3, an integrated triple radiator 8, an electronic fan 19, a drive assembly cooling unit, a pump assembly cooling unit, a hydraulic oil cooling unit, a controller, and a temperature detector. The system may also include an expansion tank 18, a connecting pipe 1 22, a connecting pipe 23, a liquid filling cap 16, and a hood 20.

[0046] Drive assembly 1 is used to enable the forklift's forward, reverse, steering, and cargo lifting functions. It includes a drive motor and an electronic control unit. The piping for drive assembly 1 is internally integrated. The structure of drive assembly 1 is shown in Figure 2. The forklift's pump assembly 12 is a crucial component of the forklift's hydraulic system, primarily responsible for providing the power and pressure required to drive the forklift's movement and cargo lifting functions. It includes a pump motor and an electronic control unit. The piping for pump assembly 12 is internally integrated. The structure of pump assembly 12 is shown in Figure 3. The forklift's hydraulic oil tank assembly 3 is a crucial component of the forklift's hydraulic system, primarily used to store and supply hydraulic oil.

[0047] Please refer to Figure 4. In this embodiment, the integrated triple radiator 8 is provided with a drive cooling chamber 15, a pump cooling chamber 14, and a hydraulic oil cooling chamber 13 arranged in sequence from top to bottom. The drive cooling chamber 15, the pump cooling chamber 14, and the hydraulic oil cooling chamber 13 are independent of each other. Due to the different working pressures and fluid properties of water cooling and oil cooling, independent drive cooling chambers 15, pump cooling chambers 14, and hydraulic oil cooling chambers 13 are provided to meet the requirements of water cooling and oil cooling. In order to improve the strength of the integrated triple radiator 8, the integrated triple radiator 8 adopts three layers of independent plate-fin boxes. The drive cooling chamber 15 is formed inside the plate-fin box of the top layer, the pump cooling chamber 14 is formed inside the plate-fin box of the middle layer, and the hydraulic oil cooling chamber 13 is formed inside the plate-fin box of the bottom layer.

[0048] In this embodiment, to facilitate refilling and adding fluid to the water cooling path, an expansion tank 18 is mounted on top of the integrated triple radiator 8. A filling port is provided at the top of the expansion tank 18, through which cooling water can be added to the expansion tank 18. A filling cap 16 is coupled to the filling port to seal it. One end of a connecting pipe 22 is connected to the expansion tank 18, and its other end is connected to the drive cooling chamber 15. Cooling water from the upper expansion tank 18 can flow into the drive cooling chamber 15 through connecting pipe 1 22, thereby replenishing or adding fluid to the drive cooling chamber 15. One end of a connecting pipe 23 is connected to the expansion tank 18, and its other end is connected to the pump cooling chamber 14. Cooling water from the upper expansion tank 18 can flow into the pump cooling chamber 14 through connecting pipe 2 23, thereby replenishing or adding fluid to the pump cooling chamber 14. To facilitate real-time monitoring of the cooling water level in the expansion tank 18, a transparent liquid viewing window 17 is also provided on the expansion tank 18.

[0049] An electronic fan 19 is mounted on the integrated triple radiator 8. When activated, the electronic fan 19 dissipates heat from the integrated triple radiator 8, thereby cooling the water in the drive cooling chamber 15 and pump cooling chamber 14, and thus the hydraulic oil in the hydraulic oil cooling chamber 13. In this embodiment, the speed of the electronic fan 19 is controllable. To protect the electronic fan 19, a fan hood 20 is mounted on the integrated triple radiator 8 and covers the electronic fan 19.

[0050] The drive assembly cooling unit is used to cool the drive assembly 1 and includes an electronic water pump 7, a cooling water inlet pipe 5, and a cooling water return pipe 9. The water inlet of the electronic water pump 7 is connected to the drive cooling chamber 15. The flow rate of the electronic water pump 7 can be designed based on the piezoresistance and flow requirements of the drive motor and electronic control. The structure is shown in Figure 5. One end of the cooling water inlet pipe 5 is connected to the water outlet of the electronic water pump 7, and the other end is connected to the water inlet of the drive assembly 1. One end of the cooling water return pipe 9 is connected to the water outlet of the drive assembly 1, and the other end is connected to the drive cooling chamber 15. When the electronic water pump 7 is activated, the cooling water in the drive cooling chamber 15 flows through the cooling water inlet pipe 5 into the pipeline integrated within the drive assembly 1 (first through the drive electronic control unit and then to the drive motor), and then returns to the drive cooling chamber 15 through the cooling water return pipe 9. The cooling water flows within the drive assembly 1, removing the heat generated by the operation of the drive assembly 1, thereby achieving heat dissipation and cooling of the drive assembly 1.

[0051] The pump assembly cooling unit is used to cool the pump assembly 12 and includes an electronic water pump 21, a cooling water inlet pipe 26, and a cooling water return pipe 210. The water inlet of the electronic water pump 21 is connected to the pump cooling chamber 14. The flow rate of the electronic water pump 21 can be designed based on the piezoresistance of the pump motor and electronic control, as well as the flow rate requirements. The structure is shown in Figure 6. One end of the cooling water inlet pipe 26 is connected to the water outlet of the electronic water pump 21, and the other end is connected to the water inlet of the pump assembly 12. One end of the cooling water return pipe 21 is connected to the water outlet of the pump assembly 12, and the other end is connected to the pump cooling chamber 14. After the electronic water pump 21 is started, the cooling water in the pump cooling chamber 14 flows through the cooling water inlet pipe 2 6 into the pipeline integrated inside the pump assembly 12 (first through the pump control electronic control unit, then to the pump motor), and then returns to the pump cooling chamber 14 through the cooling return pipe 2 10. The cooling water flows inside the pump assembly 12, taking away the heat generated by the operation of the pump assembly 12, thereby achieving heat dissipation and cooling of the pump assembly 12.

[0052] The drive assembly cooling unit and pump assembly cooling unit in this embodiment utilize integrated piping within the drive assembly 1 and pump assembly 12. This significantly reduces the overall vehicle water and electrical wiring compared to the separate layout of the motor and electronic control in traditional 80V vehicles. The cooling water in the drive assembly 1 and pump assembly 12 cannot circulate naturally, requiring the use of electronic water pump 1 7 and electronic water pump 2 21, respectively.

[0053] The hydraulic oil cooling unit is used to cool the hydraulic oil in the hydraulic oil tank assembly 3 and includes a gear pump, a steering gear 2, a hydraulic oil inlet cooling pipe 11, and a hydraulic oil return cooling pipe 4. The gear pump's oil inlet is connected to the hydraulic oil tank, and the steering gear 2's oil inlet is connected to the gear pump's oil outlet via a pipeline. One end of the hydraulic oil return cooling pipe 4 is connected to the hydraulic oil tank, and the other end is connected to the hydraulic oil cooling chamber 13. One end of the hydraulic oil inlet cooling pipe 11 is connected to the hydraulic oil cooling chamber 13, and the other end is connected to the oil outlet of the steering gear 2. After the forklift is operating, the gear pump starts, and the hydraulic oil in the hydraulic oil tank circulates through the gear pump to the steering gear 2. The steering gear 2 returns oil to the hydraulic oil cooling chamber 13 through the hydraulic oil cooling inlet cooling pipe, and then circulates back to the hydraulic oil tank through the hydraulic oil return cooling pipe 4. The hydraulic oil circulates based on the internal pressure of the hydraulic system.

[0054] This embodiment is aimed at high-performance, large-tonnage, high-voltage lithium-ion forklifts. Based on the different operating temperature requirements of the motor, electronic control, and hydraulic oil, that is, based on the different heat dissipation powers of the drive assembly 1, the pump assembly 12, and the hydraulic oil tank assembly 3, the heat dissipation system is divided into a three-circulation cooling system based on calculations and empirical design, namely, one drive cooling system, one pump cooling system, and one hydraulic oil cooling system. The heat is concentrated by an integrated triple radiator 8, forming a precise and energy-saving cooling control system. This not only meets the requirements of the motor, electronic control, and hydraulic oil operating at appropriate temperatures, but also has the advantages of simple piping connections, easy implementation of control logic, and low energy consumption requirements.

[0055] The temperature detector is used to detect the temperature of the drive assembly 1 (including the drive motor and the drive electronic control unit) and the pump assembly 12 (including the pump motor and the pump control electronic control unit) in real time. In this embodiment, temperature sensors can be set on the drive motor, the drive electronic control unit, the pump motor, and the pump control electronic control unit respectively, so as to obtain the temperature T of the drive motor in real time. a , the temperature of the drive electronic control unit T b , Pump motor temperature T c , the temperature of the pump control electronic control unit T d .

[0056] In this embodiment, the controller (which can be a forklift vehicle controller) controls the opening and closing of electronic water pump 1 7, electronic water pump 2 21, and electronic fan 19 based on the temperatures of drive assembly 1 and pump assembly 12. Since the operating temperature of the drive motor and pump motor must be ≤140°C, the operating temperature of the drive electronic control unit and pump control electronic control unit must be ≤85°C, and the operating temperature of the hydraulic oil must be ≤100°C (the converted temperature is the actual temperature measured under standard test conditions, calculated as: actual temperature + 40°C - ambient temperature). This embodiment employs the following control method to ensure that the drive motor, drive electronic control unit, pump motor, pump control electronic control unit, and hydraulic oil all operate at appropriate temperatures:

[0057] After the forklift is started, the hydraulic oil in the hydraulic oil tank circulates to the steering gear 2 through the gear pump, and then circulates to the hydraulic oil cooling chamber 13 through the steering gear 2 and the hydraulic oil inlet cooling pipe 11, and then flows back to the hydraulic oil tank through the hydraulic oil return cooling pipe 4. The hydraulic oil circulates under the internal pressure of the hydraulic system to achieve continuous cooling of the hydraulic oil, which can meet the requirement that the oil temperature does not exceed the standard;

[0058] When the temperature of the drive electronic control unit T b Greater than 45°C or the temperature of the drive motor T a When the temperature is greater than 80℃, the vehicle controller controls the electronic water pump 7 to start running;

[0059] When the temperature of the pump control electronic control unit T d Greater than 45°C or the pump motor temperature T c When the temperature is greater than 80°C, the vehicle controller controls the electronic water pump 21 to start running;

[0060] When the temperature of the drive electronic control unit T b / Temperature of the pump control electronic control unit T d Greater than 55°C, or the temperature of the drive motor T a / Pump motor temperature T c When the temperature is greater than 95°C, the vehicle controller controls the electronic fan 19 to start running;

[0061] When the temperature of the drive motor T a / Temperature of the drive electronic control unit T b / Pump motor temperature T c / Temperature of the pump control electronic control unit T d When the speed continues to increase, the controller controls the speed of the electronic fan 19 to increase linearly until it reaches the maximum speed.

[0062] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component. When a component is considered to be "fixed to" another component, it may be directly fixed to the other component or there may be a central component.

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0064] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A cooling control system for a large-tonnage high-voltage lithium-ion forklift, comprising a drive assembly (1), a pump assembly (12) and a hydraulic oil tank assembly (3); characterized in that: It also includes: An integrated triple radiator (8) provided with a drive cooling chamber (15), a pump cooling chamber (14) and a hydraulic oil cooling chamber (13); An electronic fan (19) mounted on the integrated triple radiator (8) and used to dissipate heat from the integrated triple radiator (8); A drive assembly cooling unit, which is used to cool the drive assembly (1), and comprises an electronic water pump (7), a cooling water inlet pipe (5), and a cooling water return pipe (9); the water inlet of the electronic water pump (7) is connected to the drive cooling chamber (15); one end of the cooling water inlet pipe (5) is connected to the water outlet of the electronic water pump (7) and the other end thereof is connected to the water inlet of the drive assembly (1); one end of the cooling water return pipe (9) is connected to the water outlet of the drive assembly (1) and the other end thereof is connected to the drive cooling chamber (15); A pump assembly cooling unit, which is used to cool the pump assembly (12), and comprises an electronic water pump (21), a cooling water inlet pipe (6) and a cooling water return pipe (10); the water inlet of the electronic water pump (21) is connected to the pump cooling chamber (14); one end of the cooling water inlet pipe (6) is connected to the water outlet of the electronic water pump (21) and the other end thereof is connected to the water inlet of the pump assembly (12); one end of the cooling water return pipe (10) is connected to the water outlet of the pump assembly (12) and the other end thereof is connected to the pump cooling chamber (14); A hydraulic oil cooling unit, which is used to cool the hydraulic oil in the hydraulic oil tank assembly (3), and comprises a gear pump, a hydraulic oil inlet cooling pipe (11) and a hydraulic oil return cooling pipe (4); the oil inlet of the gear pump is connected to the hydraulic oil tank; one end of the hydraulic oil return cooling pipe (4) is connected to the hydraulic oil tank and the other end is connected to the hydraulic oil cooling chamber (13); one end of the hydraulic oil inlet cooling pipe (11) is connected to the hydraulic oil cooling chamber (13) and the other end is connected to the oil outlet of the gear pump; A controller for controlling the electric operation of the electronic fan (19), the electronic water pump 1 (7), the electronic water pump 2 (21), and the gear pump; and A temperature detector, used for detecting the temperature T of the drive assembly (1) and the pump assembly (12) in real time; The controller is used to: when the temperature T of the drive assembly (1) or the pump assembly (12) is greater than a preset temperature T1, control the operation of the electronic water pump 1 (7) and / or the electronic water pump 2 (21); when the temperature T of the drive assembly (1) or the pump assembly (12) is greater than a preset temperature T2, control the operation of the electronic fan (19) and adjust the speed of the electronic fan (19); wherein the preset temperature T1 is less than the preset temperature T2.

2. The large-tonnage high-voltage lithium battery forklift cooling control system according to claim 1 is characterized in that: The hydraulic oil cooling unit also includes: The oil inlet of the steering gear (2) is connected to the oil outlet of the gear pump through a pipeline and is connected to the hydraulic oil inlet cooling pipe (11).

3. The cooling control system for a large-tonnage high-voltage lithium battery forklift according to claim 1 is characterized in that: In the integrated triple radiator (8), a drive cooling chamber (15), a pump cooling chamber (14), and a hydraulic oil cooling chamber (13) are arranged in sequence from top to bottom.

4. The cooling control system for a large-tonnage high-voltage lithium battery forklift according to claim 3 is characterized in that: The large-tonnage high-voltage lithium-ion forklift cooling control system also includes: An expansion water tank (18) is mounted on the top of the integrated triple radiator (8) and is provided with a liquid filling port on the top; A connecting pipe (22) having one end in communication with the expansion water tank (18) and the other end in communication with the drive cooling chamber (15); A second connecting pipe (23), one end of which is connected to the expansion water tank (18) and the other end of which is connected to the pump cooling chamber (14); and A liquid filling cap (16) is connected to the liquid filling port to seal the liquid filling port.

5. The cooling control system for a large-tonnage high-voltage lithium battery forklift according to claim 4 is characterized in that: The expansion water tank (18) is also provided with a transparent liquid viewing window (17).

6. The cooling control system for a large-tonnage high-voltage lithium battery forklift according to claim 1 is characterized in that: The integrated triple radiator (8) comprises three plate-fin type boxes arranged in sequence from top to bottom, wherein the interior of the plate-fin type box at the top layer forms a drive cooling chamber (15), the interior of the plate-fin type box at the middle layer forms a pump cooling chamber (14), and the interior of the plate-fin type box at the bottom layer forms a hydraulic oil cooling chamber (13).

7. The large-tonnage high-voltage lithium battery forklift cooling control system according to claim 1 is characterized in that: The large-tonnage high-voltage lithium-ion forklift cooling control system also includes: A wind cover (20) is arranged outside the electronic fan (19) and installed on the integrated triple radiator (8).

8. The cooling control system for a large-tonnage high-voltage lithium battery forklift according to claim 1 is characterized in that: The drive assembly (1) includes a drive motor and a drive electronic control unit, and the pump assembly (12) includes a pump motor and a pump electronic control unit; the temperature detector is used to detect the temperature T of the drive motor in real time. a , the temperature of the drive electronic control unit T b , Pump motor temperature T c , the temperature of the pump control electronic control unit T d ; The controller is used for: When the temperature of the drive motor T a Greater than a preset temperature T 1a When, or when the temperature of the drive electronic control unit T b Greater than a preset temperature T 1b When the electronic water pump 1 (7) is controlled to run; where: T 1a Greater than T 1b ; When the pump motor temperature T c Greater than the preset temperature T 1a When, or when the temperature T of the pump control electronic control unit d Greater than the preset temperature T 1b When the electronic water pump 2 (21) is controlled to operate; When the temperature of the drive motor T a / Pump motor temperature T c Greater than a preset temperature T 2a When, or when the temperature of the drive electronic control unit T b / Temperature of the pump control electronic control unit T d Greater than a preset temperature T 2b When the electronic fan (19) is controlled to run and the speed of the electronic fan (19) is adjusted; wherein: T 2a Greater than T 2b , T 2a Greater than T 1a , T 2b Greater than T 1b .

9. A cooling control method for a large-tonnage high-voltage lithium battery forklift, characterized in that: It adopts a large-tonnage high-voltage lithium-ion forklift cooling control system as described in any one of claims 1 to 7, comprising the following steps: Obtaining the temperature T of the drive assembly (1) and the pump assembly (12); When the temperature T of the drive assembly (1) and / or the pump assembly (12) is greater than a preset temperature T1, the electronic water pump 1 (7) and / or the electronic water pump 2 (21) are controlled to operate; When the temperature T of the drive assembly (1) and / or the pump assembly (12) is greater than a preset temperature T2, the electronic fan (19) is controlled to operate and the speed of the electronic fan (19) is adjusted; The preset temperature T1 is lower than the preset temperature T2.

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