CN-117088298-B - Cooling control system and control method for large-tonnage high-voltage lithium battery forklift

CN117088298BCN 117088298 BCN117088298 BCN 117088298BCN-117088298-B

Abstract

The invention relates to a cooling control system and a control method for a large-tonnage high-voltage lithium battery forklift. The system comprises a driving assembly, a pump assembly, a hydraulic oil tank assembly, an integrated triple radiator, an electronic fan, a driving assembly cooling unit, a pump assembly cooling unit, a hydraulic oil cooling unit, a controller and a temperature detector. Aiming at the high-performance large-tonnage high-voltage lithium battery forklift, the heat dissipation system is divided into three paths of circulating cooling systems according to different requirements on working temperatures of a motor, electric control and hydraulic oil, namely one path of driving cooling, one path of pump cooling and one path of hydraulic oil cooling, and one integrated triple radiator is used for concentrated heat dissipation, so that the large-tonnage high-voltage lithium battery forklift driving and the two paths of water cooling of the pump and one path of oil cooling control system are built, and a precise, energy-saving, reliable and stable cooling control system is formed, the motor, the electric control and the hydraulic oil are all operated at proper temperatures, and meanwhile, the advantages of simplicity in pipeline connection, easiness in realization of control logic and low energy consumption requirement are achieved.

Inventors

ZHOU PENG
REN XINLEI
HU ZHUTIAN
CHEN SHISHENG
ZHANG JUN
GE LIYIN
ZHANG HUAJUN
CHEN XIUYUN
GONG RENTAO
HOU SHUQING

Assignees

安徽合力股份有限公司

Dates

Publication Date: 20260512
Application Date: 20230724

Claims (9)

1. The cooling control system of the large-tonnage high-voltage lithium battery forklift truck comprises a driving assembly (1), a pump assembly (12) and a hydraulic oil tank assembly (3), and is characterized by further comprising: 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) which is mounted on the integrated triple radiator (8) and is used for radiating heat of the integrated triple radiator (8); The cooling unit of the driving assembly (1) is used for cooling the driving assembly (1) and comprises an electronic water pump I (7), a cooling water inlet pipe I (5) and a cooling water return pipe I (9), wherein a water inlet of the electronic water pump I (7) is communicated with a driving cooling chamber (15), one end of the cooling water inlet pipe I (5) is communicated with a water outlet of the electronic water pump I (7) and the other end of the cooling water inlet pipe I is communicated with a water inlet of the driving assembly (1), and one end of the cooling water return pipe I (9) is communicated with a water outlet of the driving assembly (1) and the other end of the cooling water return pipe I is communicated with the driving cooling chamber (15); The cooling unit of the pump assembly (12) is used for cooling the pump assembly (12) and comprises a second electronic water pump (21), a second cooling water inlet pipe (6) and a second cooling water return pipe (10), wherein a water inlet of the second electronic water pump (21) is communicated with the pump cooling chamber (14), one end of the second cooling water inlet pipe (6) is communicated with a water outlet of the second electronic water pump (21) and the other end of the second cooling water inlet pipe is communicated with a water inlet of the pump assembly (12), and one end of the second cooling water return pipe (10) is communicated with a water outlet of the pump assembly (12) and the other end of the second cooling water return pipe is communicated with the pump cooling chamber (14); The hydraulic oil cooling unit is used for cooling the hydraulic oil of 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), wherein an oil inlet of the gear pump is communicated with the hydraulic oil tank, one end of the hydraulic oil return cooling pipe (4) is communicated with the hydraulic oil tank, the other end of the hydraulic oil return cooling pipe is communicated with the hydraulic oil cooling chamber (13), one end of the hydraulic oil inlet cooling pipe (11) is communicated with the hydraulic oil cooling chamber (13), and the other end of the hydraulic oil inlet cooling pipe is communicated with an oil outlet of the gear pump; A controller for controlling the electric operation of the electronic fan (19), the electronic water pump I (7), the electronic water pump II (21) and the gear pump, and A temperature detector for detecting the temperature T of the driving assembly (1) and the pump assembly (12) in real time; The controller is used for controlling the first electronic water pump (7) and/or the second electronic water pump (21) to operate when the temperature T of the driving assembly (1) or the pump assembly (12) is greater than a preset temperature T 1 , controlling the electronic fan (19) to operate and adjusting the rotating speed of the electronic fan (19) when the temperature T of the driving assembly (1) or the pump assembly (12) is greater than a preset temperature T 2 , wherein the preset temperature T 1 is smaller than the preset temperature T 2 .
2. The cooling control system of a large tonnage high voltage lithium battery forklift of claim 1, wherein the hydraulic oil cooling unit further comprises: and an oil inlet of the steering gear (2) is communicated with an oil outlet of the gear pump through a pipeline and is communicated with a hydraulic oil inlet cooling pipe (11).
3. The cooling control system of the large-tonnage high-voltage lithium battery forklift truck according to claim 1, wherein the driving cooling chamber (15), the pump cooling chamber (14) and the hydraulic oil cooling chamber (13) are sequentially arranged in the integrated triple radiator (8) from top to bottom.
4. The cooling control system of a large tonnage high voltage lithium battery forklift of claim 3, further comprising: the expansion water tank (18) is arranged at the top end of the integrated triple radiator (8), and the top end of the expansion water tank is provided with a liquid filling port; A first connecting pipe (22) having one end communicated with the expansion tank (18) and the other end communicated with the drive cooling chamber (15); A second connecting pipe (23) having one end communicating with the expansion tank (18) and the other end communicating with the pump cooling chamber (14), and And the liquid adding cover (16) is connected with the liquid adding opening in a matching way so as to seal the liquid adding opening.
5. The cooling control system of the large-tonnage high-voltage lithium battery forklift truck according to claim 4, wherein a transparent liquid observing window (17) is further arranged on the expansion water tank (18).
6. The cooling control system of the large-tonnage high-voltage lithium battery forklift truck according to claim 1, wherein the integrated triple radiator (8) comprises three plate-fin type boxes which are sequentially arranged from top to bottom, a driving cooling chamber (15) is formed in the uppermost plate-fin type box, a pump cooling chamber (14) is formed in the middle plate-fin type box, and a hydraulic oil cooling chamber (13) is formed in the lowermost plate-fin type box.
7. The cooling control system of a large tonnage high voltage lithium battery forklift of claim 1, further comprising: and the fan cover (20) is covered outside the electronic fan (19) and is arranged on the integrated triple radiator (8).
8. The cooling control system of the large-tonnage high-voltage lithium-ion forklift truck according to claim 1, wherein the driving assembly (1) comprises a driving motor and a driving electric control unit, the pump assembly (12) comprises a pump motor and a pump control electric control unit, the temperature detector is used for detecting the temperature T a of the driving motor, the temperature T b of the driving electric control unit, the temperature T c of the pump motor and the temperature T d of the pump control electric control unit in real time, and the controller is used for: When the temperature T a of the driving motor is greater than a preset temperature T 1a or when the temperature T b of the driving electric control unit is greater than a preset temperature T 1b , controlling the first electronic water pump (7) to operate, wherein T 1a is greater than T 1b ; when the temperature T c of the pump motor is greater than the preset temperature T 1a or when the temperature T d of the pump control electric control unit is greater than the preset temperature T 1b , controlling the electronic water pump II (21) to operate; When the temperature T a of the driving motor/the temperature T c of the pump motor is larger than a preset temperature T 2a or when the temperature T b of the driving electric control unit/the temperature T d of the pump control electric control unit is larger than a preset temperature T 2b , controlling the electronic fan (19) to run and adjusting the rotating speed of the electronic fan (19), wherein T 2a is larger than T 2b ,T 2a and T 1a ,T 2b is larger than T 1b .
9. A cooling control method for a large-tonnage high-voltage lithium battery forklift truck, which is characterized by adopting the cooling control system for the large-tonnage high-voltage lithium battery forklift truck according to any one of claims 1-7, and comprising the following steps: Acquiring the temperatures T of the driving assembly (1) and the pump assembly (12); When the temperature T of the driving assembly (1) and/or the pump assembly (12) is greater than a preset temperature T 1 , controlling the first electronic water pump (7) and/or the second electronic water pump (21) to operate; when the temperature T of the driving assembly (1) and/or the pump assembly (12) is greater than a preset temperature T 2 , controlling the electronic fan (19) to run and regulating the rotating speed of the electronic fan (19); Wherein the preset temperature T 1 is less than the preset temperature T 2 .

Description

Cooling control system and control method for large-tonnage high-voltage lithium battery forklift Technical Field The invention relates to the technical field of forklift cooling control, in particular to a cooling control system and a cooling control method for a large-tonnage high-voltage lithium battery forklift. Background The 4-10t electric fork-lift truck is generally classified as a large-tonnage electric fork-lift truck, the existing large-tonnage electric fork-lift truck is generally an 80V voltage platform, and the driving and pumping motors are three-phase asynchronous alternating current motors, and mainly adopt an air cooling-natural cooling mode. The current of the prior performance index is large, the temperature rise is large, and no further lifting space is provided for the motor and the electric control under the condition of being subjected to an 80V voltage platform. And the motor resources suitable for the 80V platform in China are limited, and the motor with high adaptation degree is not used for improving the performance index of the existing whole vehicle. Based on 350V voltage platform, the high-voltage lithium battery forklift equipped with the permanent magnet synchronous water-cooled motor power system has the advantages that the whole forklift performance index is obviously improved compared with that of the existing 80V forklift, the whole forklift can be compared with an internal combustion forklift, the motor and the electric control resources are based on the domestic mature high-voltage commercial vehicle platform, the resources are rich, and the selectivity is high. The large-tonnage high-voltage lithium battery forklift is provided with 1 set of driving motor, 2 sets of pump motor, 1 set of driving electric control unit and 2 sets of pump control electric control unit, wherein the 1 set of driving motor and the 1 set of driving electric control unit form a driving assembly, and the 2 sets of pump motor and the 2 sets of pump control electric control unit form a pump assembly. However, the improvement of the performance index of the whole vehicle also brings about the problem of overhigh hydraulic oil temperature, so that the hydraulic system is maintained to work at a proper temperature, the loss of hydraulic parts is reduced, and the hydraulic oil is required to be radiated. Because the components needing heat dissipation are more, the temperature requirements of all systems are different, and great challenges are brought to the layout design and the control design of the cooling system. Disclosure of Invention Based on the above, the cooling control system and the control method thereof for the large-tonnage high-voltage lithium battery forklift are provided for solving the technical problems that the existing large-tonnage high-voltage lithium battery forklift has more parts needing heat dissipation, different system temperature requirements and great challenges are brought to the layout design and the control design of the cooling system. The invention provides a cooling control system of a large-tonnage high-voltage lithium battery forklift, which comprises a driving assembly, a pump assembly and a hydraulic oil tank assembly, and further comprises the following components: The integrated triple radiator is provided with a driving cooling chamber, a pump cooling chamber and a hydraulic oil cooling chamber; the electronic fan is arranged on the integrated triple radiator and used for radiating the integrated triple radiator; The driving assembly cooling unit is used for cooling the driving assembly and comprises an electronic water pump I, a cooling water inlet pipe I and a cooling water return pipe I, wherein a water inlet of the electronic water pump I is communicated with the driving cooling chamber; The cooling unit of the pump assembly is used for cooling the pump assembly and comprises a second electronic water pump, a second cooling water inlet pipe and a second cooling water return pipe, wherein a water inlet of the second electronic water pump is communicated with the pump cooling chamber; The hydraulic oil cooling unit is used for cooling hydraulic oil of the hydraulic oil tank assembly and comprises a gear pump, a hydraulic oil inlet cooling pipe and a hydraulic oil return cooling pipe, wherein an oil outlet of the gear pump is communicated with the hydraulic oil tank; a controller connected with the electronic fan, the electronic water pump I, the electronic water pump II and the gear pump, and A temperature detector for detecting the temperature T of the driving assembly and the pump assembly in real time; The controller is used for controlling the first electronic water pump and/or the second electronic water pump to operate when the temperature T of the driving assembly or the pump assembly is greater than a preset temperature T 1, controlling the electronic fan to operate and adjusting the rotating speed of the electronic fan when the temperature T of