Pure electric mining dump truck battery accurate thermal management system

Abstract

A battery precise thermal management system of a pure electric mining dump truck comprises a water circulation system and a control system, the water circulation system comprises a battery thermal management unit, an expansion water tank and a plurality of battery pack sets, and the output end of the battery thermal management unit is connected with the input end of a first four-way pipe through a main water inlet pipe; the output end of the first four-way pipe is connected with the input ends of the battery pack sets through branch water inlet pipes, the output ends of the battery pack sets are connected with the input end of the second four-way pipe through branch water return pipes, and the output end of the second four-way pipe is connected with the input end of the battery heat management unit through a main water return pipe. A liquid adding pipe of the expansion water tank is communicated with the main water return pipe through a first three-way pipe, and a breather pipe of the expansion water tank is communicated with the main water return pipe through a second three-way pipe; the control system comprises a temperature sensor used for monitoring the temperature of the branch water return pipe, a vehicle control unit connected with the temperature sensor, and an electric control water valve connected with the vehicle control unit and arranged on the branch water inlet pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pipe systems, in particular to a precise thermal management system for batteries of pure electric mining dump trucks. Background Art

[0002] Pure electric mining dump trucks have a large tonnage. In order to ensure the transportation capacity of the vehicle, multiple battery packs are generally used as power sources. Due to manufacturing errors, different assembly methods, different vehicle wiring methods, etc., multiple battery packs will release heat unevenly during the charging and discharging process, resulting in a large temperature difference between the battery packs, thereby affecting the charging efficiency or the electric braking performance of the vehicle.

[0003] The battery cooling technologies currently used are all technologies that cannot control the flow rate. One unit cools six battery packs, and there are two battery packs on each branch. The flow rates between the branches are basically uniform and cannot be adjusted. The disadvantages of the existing technology are: a. The branch flow rate cannot be adjusted; b. The six battery packs corresponding to the unit cannot be cooled and adjusted according to the actual temperature of the battery pack; c. When the temperature difference of the battery pack is large, it cannot be adjusted automatically, and can only be shut down for natural cooling to reduce the temperature difference of the battery pack. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a precise thermal management system for batteries of a pure electric mining dump truck, which can solve the problem of large temperature differences between battery packs.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a precise thermal management system for batteries of pure electric mining dump trucks, including a water circulation system and a control system, the water circulation system including a battery thermal management unit, an expansion water tank and a plurality of battery pack groups, the output end of the battery thermal management unit is connected to the input end of the first four-way pipe through a main water inlet pipe, the output end of the first four-way pipe is respectively connected to the input end of each battery pack group through a branch water inlet pipe, the output end of the battery pack group is connected to the input end of the second four-way pipe through a branch return pipe, the output end of the second four-way pipe is connected to the input end of the battery thermal management unit through the main return pipe, the liquid filling pipe of the expansion water tank is connected to the main return pipe through a first three-way pipe, and the ventilation pipe of the expansion water tank is connected to the main return pipe through a second three-way pipe; the control system includes a temperature sensor for monitoring the temperature of the branch return pipe, a vehicle controller connected to the temperature sensor, and an electrically controlled water valve connected to the vehicle controller and arranged on the branch water inlet pipe. The principle of the utility model is as follows: a temperature sensor is added to the water return pipe of the battery pack, and an electric-controlled water valve is added to the water inlet pipe of the battery pack; the temperature sensor is connected to the CAN bus of the vehicle controller, and the temperature information is sent to the vehicle controller. The vehicle controller sends instructions to the rear domain controller, and the opening of the electric-controlled water valve is controlled by the rear domain controller.

[0006] As an improvement, the battery pack group consists of two battery packs connected in series.

[0007] Compared with the prior art, the utility model has the following beneficial effects:

[0008] A temperature sensor is added to the return pipe of the battery pack, and an electric water valve is added to the water inlet pipe of the battery pack; the temperature sensor is connected to the CAN bus of the vehicle controller and sends the temperature information to the vehicle controller. The vehicle controller sends instructions to the rear domain controller, and the opening of the electric water valve is controlled by the rear domain controller to solve the problem of large temperature difference between the battery packs. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is the pipeline layout diagram of the utility model.

[0010] Figure 2 It is the flow chart of control system. DETAILED DESCRIPTION

[0011] The utility model will be further described below in conjunction with the accompanying drawings.

[0012] like Figure 1 As shown, a precise thermal management system for batteries of a pure electric mining dump truck includes a water circulation system and a control system, wherein the water circulation system includes a battery thermal management unit 1, an expansion water tank 2 and a plurality of battery pack groups. In the present embodiment, there are three battery pack groups, each of which is composed of two battery packs 3 connected in series, and the system is provided with a total of six battery packs 3. The output end of the battery thermal management unit 1 is connected to the input end of the first four-way pipe 4 through the main water inlet pipe 8, and the output end of the first four-way pipe 4 is respectively connected to the input end of each battery pack group through the branch water inlet pipe 9, and the output end of the battery pack group is connected to the input end of the second four-way pipe 5 through the branch return pipe 10, and the output end of the second four-way pipe 5 is connected to the input end of the battery thermal management unit 1 through the main return pipe 11; the liquid filling pipe of the expansion water tank 2 is connected to the main return pipe 11 through the first three-way pipe, and the ventilation pipe of the expansion water tank 2 is connected to the main return pipe 11 through the second three-way pipe. As shown Figure 2 As shown, the control system includes a temperature sensor 6 for monitoring the temperature of the branch return pipe 10, a vehicle controller 16 connected to the temperature sensor 6, a rear domain controller 17 connected to the vehicle controller 16, and an electric-controlled water valve 7 connected to the rear domain controller 17 and arranged on the branch water inlet pipe 9.

[0013] The temperature sensor 6 feeds back the outlet water temperature t of the battery pack of each branch to the vehicle controller 16. The vehicle controller 16 takes the average temperature t0=(t1+t2+t3+t4+t5+t6) / 6, and then compares the temperature of each branch with the average value, and controls the electronically controlled water valve 7 according to the temperature difference. In order to ensure that the temperature difference of each branch is ≤3℃, it is set that when the temperature difference |△t|≤1.5℃, the electronically controlled water valve 7 is not adjusted, and when |△t|>1.5℃, the electronically controlled water valve 7 begins to be adjusted. For example: if the temperature difference △t3 of branch 3 is less than -1.5℃, and the temperature difference △t5 of branch 5 is greater than 1.5℃, the electronically controlled water valve of branch 3 is adjusted to reduce the flow rate V3 of branch 3; at the same time, the electronically controlled water valve of branch 5 is adjusted to increase the flow rate V5 of branch 5. The greater the temperature difference, the greater the adjustment range. By adjusting the branch flow, the temperature of multiple battery packs is kept in a balanced state.

[0014] Principle of the utility model: add a temperature sensor 6 at the return pipe of the battery pack, and add an electric control water valve 7 at the water inlet pipe of the battery pack; the temperature sensor 6 is connected to the CAN bus of the vehicle controller 16, and the temperature information is sent to the vehicle controller 16, and the vehicle controller 16 sends instructions to the rear domain controller 17, and the opening of the electric control water valve 7 is controlled by the rear domain controller 17, which can solve the problem of large temperature difference between each battery pack 3.

Claims

1. A precise thermal management system for batteries of pure electric mining dump trucks, including a water circulation system and a control system, characterized in that: The water circulation system includes a battery thermal management unit, an expansion water tank and several battery pack groups. The output end of the battery thermal management unit is connected to the input end of the first four-way pipe through a main water inlet pipe, and the output end of the first four-way pipe is respectively connected to the input end of each battery pack group through a branch water inlet pipe. The output end of the battery pack group is connected to the input end of the second four-way pipe through a branch return pipe, and the output end of the second four-way pipe is connected to the input end of the battery thermal management unit through the main return pipe. The filling pipe of the expansion water tank is connected to the main return pipe through a first three-way pipe, and the ventilation pipe of the expansion water tank is connected to the main return pipe through a second three-way pipe; the control system includes a temperature sensor for monitoring the temperature of the branch return pipe, a vehicle controller connected to the temperature sensor, and an electrically controlled water valve connected to the vehicle controller and arranged on the branch water inlet pipe.

2. According to claim 1, a battery precision thermal management system for a pure electric mining dump truck is characterized by: The battery pack group consists of two battery packs connected in series.

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