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CN-121989760-A - Power temperature-dividing control thermal management system

CN121989760ACN 121989760 ACN121989760 ACN 121989760ACN-121989760-A

Abstract

The invention discloses a power temperature-dividing control thermal management system which comprises a lithium battery pack mechanism and a power thermal management mechanism which are connected in parallel, wherein the lithium battery pack mechanism comprises a liquid thermal loop and a liquid cooling loop, the liquid thermal loop and the liquid cooling loop are connected in parallel through a common heat exchange unit, the power thermal management mechanism comprises a traction cooling loop, an oil pump cooling loop and a hydraulic oil cooling loop which are mutually independent, and the liquid cooling loop, the traction cooling loop, the oil pump cooling loop and the hydraulic oil cooling loop are mutually independent. According to the invention, the lithium battery pack mechanism and the power thermal management mechanism are arranged in parallel, and the parallel type liquid heat/liquid cooling loop, the traction, the oil pump and the hydraulic oil cooling loop which are mutually independent are respectively built in the respective systems, so that the independent temperature control of different power parts is realized, and the overall thermal adaptability and the running stability of the electric fork-lift truck are effectively improved.

Inventors

  • Ye Hugen
  • ZHOU PENG
  • CHEN SHISHENG
  • LI YANG
  • PAN YANG

Assignees

  • 安徽合力股份有限公司

Dates

Publication Date
20260508
Application Date
20260228

Claims (9)

  1. 1. The power temperature-dividing control heat management system is characterized by comprising a lithium battery pack mechanism (1) and a power heat management mechanism (2) which are connected in parallel, wherein the lithium battery pack mechanism (1) comprises a liquid heat loop (11) and a liquid cooling loop (12), the liquid heat loop (11) and the liquid cooling loop (12) are connected in parallel through a common heat exchange unit (13), the power heat management mechanism (2) comprises a traction cooling loop (21), an oil pump cooling loop (22) and a hydraulic oil cooling loop (23) which are independent from each other, and the liquid cooling loop (12) and the traction cooling loop (21), the oil pump cooling loop (22) and the hydraulic oil cooling loop (23) are arranged independent from each other.
  2. 2. The power split temperature control thermal management system of claim 1, wherein the heat exchange unit (13) is a battery cooler.
  3. 3. The power split temperature control heat management system according to claim 1, wherein the liquid cooling circuit (11) comprises a lithium battery pack (111), a heater (112), a first pump body (113) and the heat exchange unit (13) which are sequentially connected in series, and the liquid cooling circuit (12) comprises the heat exchange unit (13), a compressor (121), a first condenser (122) and an expansion valve (123) which are sequentially connected in series.
  4. 4. The power split temperature control thermal management system according to claim 1, wherein the traction cooling circuit (21) is formed by a traction cooling chamber of a second condenser (24), a second pump body (211), and cooling pipes of a traction motor assembly (212) connected in series; The oil pump cooling loop (22) is formed by connecting an oil pump cooling chamber of the second condenser (24), a third pump body (221) and a cooling pipeline of an oil pump motor assembly (222) in series; The hydraulic oil cooling loop (23) comprises a hydraulic oil tank (233), a gear pump (232), a steering gear (231) and a hydraulic cooling chamber of the second condenser (24) which are sequentially connected, and an outlet of the hydraulic cooling chamber is connected back to the hydraulic oil tank (233).
  5. 5. The power split temperature control thermal management system of claim 4, wherein the traction motor assembly (212) integrates a traction motor and a traction electrical control, and incorporates a first cooling circuit; the oil pump motor assembly is integrated with at least one oil pump motor and a motor controller thereof, and is internally provided with a second cooling loop.
  6. 6. The power split temperature control thermal management system of claim 1, wherein the lithium battery pack mechanism (1) further comprises a controller (14) for independently controlling start-stop of the liquid-heat circuit (11) and the liquid-cooling circuit (12) according to a temperature signal.
  7. 7. The power split temperature control thermal management system of claim 1, wherein the lithium battery pack mechanism (1) further comprises a water kettle (15) connected to the heat exchange unit (13).
  8. 8. An electric fork-lift truck, characterized by comprising a frame (3) and a power split temperature control thermal management system according to any one of claims 1-7; the frame (3) is provided with a thermal management unit room for accommodating part of components of the power split temperature control thermal management system; The first condenser (122) and the second condenser (24) are fixed on the frame (3) through a mounting bracket.
  9. 9. The electric fork-lift truck according to claim 7, characterized in that the thermal management unit compartment is provided on the rear side of the upper pedal of the frame (3).

Description

Power temperature-dividing control thermal management system Technical Field The invention relates to the technical field of forklift manufacturing, in particular to a power temperature-dividing control thermal management system. Background With the wide application of electric fork-lift in the industrial logistics field, the adaptability requirement on the environment temperature is increasingly improved. The power system of the electric forklift generally comprises core components such as a lithium battery pack, a traction motor, an oil pump motor, a hydraulic system and the like, all of which can generate heat in the working process, and each component has different proper working temperature ranges. The existing thermal management system of the electric forklift generally adopts a single cooling circuit to uniformly cool each component or only carries out heat dissipation treatment on part of main heating components. The processing mode has the following technical problems: First, the lithium battery pack is inconsistent with the working temperature window of the motor, the electric control system and the hydraulic system, and the optimal temperature requirements of all components are difficult to be met by single-loop cooling. For example, the lithium battery pack needs to be heated in a low-temperature environment to maintain charge and discharge performance, and needs to be forcedly cooled in a high-temperature environment to prevent thermal runaway, and the motor and the electric control system have more urgent heat dissipation requirements in a high-temperature working condition. Second, in the prior art, the thermal management of the lithium battery pack generally depends on the working state of the whole vehicle power system, and when the forklift stops charging, the cooling system cannot independently operate, so that the heat of the battery cannot be discharged in time in the high-rate charging process, and the realization of the quick charging capability is limited. Therefore, how to provide a thermal management system capable of performing independent control according to the differential temperature requirements of each component, so as to improve the adaptability and the operation reliability of the electric forklift in an extreme temperature environment, is a technical problem to be solved by those skilled in the art. Disclosure of Invention In view of the above, the invention provides a power temperature-dividing control thermal management system, which is characterized in that a lithium battery pack mechanism and a power thermal management mechanism are arranged in parallel, and a parallel liquid heat/liquid cooling loop, a traction, an oil pump and a hydraulic oil cooling loop which are mutually independent are respectively constructed in the respective systems, so that the temperature-dividing independent control of different power components is realized, and the overall thermal adaptability and the running stability of an electric forklift are effectively improved. In order to achieve the above purpose, the invention adopts the following technical scheme: The invention discloses a power temperature-dividing control thermal management system which comprises a lithium battery pack mechanism and a power thermal management mechanism which are connected in parallel, wherein the lithium battery pack mechanism comprises a liquid thermal loop and a liquid cooling loop, the liquid thermal loop and the liquid cooling loop are connected in parallel through a common heat exchange unit, the power thermal management mechanism comprises a traction cooling loop, an oil pump cooling loop and a hydraulic oil cooling loop which are mutually independent, and the liquid cooling loop, the traction cooling loop, the oil pump cooling loop and the hydraulic oil cooling loop are mutually independent. As a further aspect of the present invention, the heat exchange unit is a battery cooler. The liquid cooling loop comprises a lithium battery pack, a heater, a first pump body and the heat exchange unit which are sequentially connected in series, and the liquid cooling loop comprises the heat exchange unit, a compressor, a first condenser and an expansion valve which are sequentially connected in series. The traction cooling loop is formed by connecting a traction cooling chamber of the second condenser, a second pump body and a cooling pipeline of the traction motor assembly in series; the oil pump cooling loop is formed by connecting an oil pump cooling chamber of the second condenser, a third pump body and a cooling pipeline of an oil pump motor assembly in series; the hydraulic oil cooling loop comprises a hydraulic oil tank, a gear pump, a steering gear and a hydraulic cooling chamber of the second condenser which are sequentially connected, and an outlet of the hydraulic cooling chamber is connected back to the hydraulic oil tank. The traction motor assembly is integrated with a traction motor and a traction