Integrated motor waste heat recovery bus thermal management system and electric bus

Abstract

The utility model discloses a kind of integrated motor waste heat recovery's passenger train thermal management system, comprising: motor cooling circuit, battery cooling circuit, motor cooling circuit includes series connection's water pump A, motor, motor radiator, three-way valve A, kettle A, battery cooling circuit includes series connection's water pump B, three-way valve B, battery cooling heat exchanger, kettle B, power battery, heater, wherein, motor cooling circuit and battery cooling circuit are coupled by three-way valve A, three-way valve B series-parallel connection. Utilize the characteristics of three-way valve low cost, high reliability, low maintenance requirement, while pipeline reconstruction amount is reduced, the cost of transformation is reduced, make system comprehensive cost drop;According to different ambient temperature, single motor waste heat mode, motor waste heat and heater cooperative heating mode are taken respectively, optimal heat exchange efficiency is realized, energy consumption is significantly reduced.

Description

Technical Field

[0001] This utility model relates to the field of electric bus technology, and in particular to a bus thermal management system that integrates motor waste heat recovery. Background Technology

[0002] A Chinese invention patent, CN 110364651 B, entitled "A Dual-Mode Cooling Power Battery Thermal Management System with Motor Waste Heat Recovery," provides a thermal management system with motor waste heat recovery. The system includes a battery water-cooling plate, water pipes, air conditioning pipes, a compressor, a battery heat exchanger, an electronic expansion valve, a condenser, a fan, an electronic four-way water valve, an electronic three-way proportional valve, a radiator, a motor three-in-one unit, a small three-in-one unit, a motor water pump, a battery water pump, and a three-way water valve. This system uses the four-way water valve to achieve series coupling between the motor cooling circuit and the battery cooling circuit, utilizing motor waste heat for battery heating and temperature control, significantly reducing PTC heater energy consumption and effectively improving the low-temperature range of new energy vehicles.

[0003] However, this solution presents engineering compatibility issues in bus applications: First, existing bus thermal management systems use integrated water-cooled air conditioning for battery cooling, while the motor and multi-functional system are cooled by dedicated radiators. Directly adopting this patented solution would require large-scale modifications to the existing piping system. Second, the four-way water valve, as a core component, has a complex structural design that leads to high manufacturing and maintenance costs, posing reliability risks and cost control pressures in the bus sector, where high cost-effectiveness is paramount. Furthermore, while the solution uses a combined heating mode of motor waste heat and PTC (Power Transmission Control) to reduce PTC operating power, when the ambient temperature is relatively high, the motor waste heat alone can meet the requirements. If the PTC continues to operate at this temperature, unnecessary additional energy consumption will occur. Utility Model Content

[0004] This application provides a bus thermal management system integrating motor waste heat recovery, which enables battery heating and motor waste heat recovery while reducing costs. This application also provides an electric bus.

[0005] The first aspect of this application provides a bus thermal management system with integrated motor waste heat recovery, comprising:

[0006] The motor cooling circuit includes a water pump A, a motor, a motor radiator, a three-way valve A, and a water tank A connected in series.

[0007] The battery cooling circuit includes a water pump B, a three-way valve B, a battery cooling heat exchanger, a water tank B, a power battery, and a heater connected in series.

[0008] The motor cooling circuit and the battery cooling circuit are coupled in series and parallel through the three-way valve A and the three-way valve B.

[0009] The beneficial effects of the above embodiments are as follows:

[0010] (1) Taking advantage of the low cost, high reliability and low maintenance requirements of the three-way valve, the amount of pipeline modification is reduced and the modification cost is reduced, thus reducing the overall cost of the system.

[0011] (2) Based on different ambient temperatures, single motor waste heat mode and motor waste heat and heater synergistic heating mode are adopted respectively to achieve optimal heat exchange efficiency and significantly reduce energy consumption.

[0012] Based on the above embodiments, the embodiments of this application can be further improved as follows:

[0013] In one embodiment of this application, the motor cooling circuit further includes a multi-function module connected in series.

[0014] In one embodiment of this application, the motor radiator is equipped with a cooling fan. The beneficial effect of this step is that the cooling fan improves heat dissipation efficiency.

[0015] In one embodiment of this application: the motor cooling circuit further includes a temperature sensor connected in series, the temperature sensor being connected to the cooling fan's electrical control signal via a controller. The advantage of this step is that it facilitates automatic adjustment of the cooling fan's operating intensity based on the water temperature.

[0016] In one embodiment of this application: the three-way valve A is directly connected to one end of the water inlet of the battery cooling heat exchanger, and the three-way valve B is directly connected to the other end of the water inlet of the battery cooling heat exchanger.

[0017] The second aspect of this application provides an electric bus, including the aforementioned integrated motor waste heat recovery bus thermal management system. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0019] Figure 1 This is a schematic diagram of a bus thermal management system.

[0020] Among them, 1 is water pump A, 2 is motor, 3 is motor radiator, 4 is three-way valve A, 5 is water tank A, 6 is water pump B, 7 is three-way valve B, 8 is battery cooling heat exchanger, 9 is water tank B, 10 is power battery, 11 is heater, 12 is multi-function module, and 13 is temperature sensor. Detailed Implementation

[0021] In this application, unless otherwise expressly specified and limited, the terms used should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium. If electrical or electronic equipment is involved, it can also refer to an electrical connection or a communication signal connection, etc. For those skilled in the art, the specific meaning of different terms in this utility model can be understood according to the specific circumstances, and the scope of the specific meaning should be limited to achieving the function of this application.

[0022] In the description of this application, it should be understood that the directional terms or positional relationships described are based on the orientation or positional relationships shown in the accompanying drawings, or based on the orientation or positional relationships in actual use, and are only for the purpose of facilitating the description of the contents of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] Example 1

[0024] like Figure 1 A bus thermal management system integrating motor waste heat recovery includes: a motor cooling circuit and a battery cooling circuit. The motor cooling circuit includes a water pump A1, a motor 2, a motor radiator 3, a three-way valve A4, and a water tank A5 connected in series. The battery cooling circuit includes a water pump B6, a three-way valve B7, a battery cooling heat exchanger 8, a water tank B9, a power battery 10, and a heater 11 connected in series. The motor cooling circuit and the battery cooling circuit are coupled in series and parallel through the three-way valves A4 and B7.

[0025] Specifically, the motor cooling circuit also includes a multi-in-one module 12 connected in series. The multi-in-one module 12 is a five-in-one module, specifically including a motor controller, DC-DC converter, power distribution box, air pump controller, and oil pump controller. The five-in-one module 12 is a controller integration module, which is one of the commonly used devices in the field of electric buses. They are integrated and installed in the same housing. The housing is equipped with a water inlet and a water outlet. The water outlet of water pump A1 is connected to the water inlet of the housing, thereby realizing the function of cooling the components in the housing.

[0026] Specifically, both the outer casing of the motor 2 and the power battery 10 are equipped with water inlets, and the outer casing is equipped with a flow channel that connects the water inlets. The motor 2 and the power battery 10 are connected to the pipes through the water inlets, thereby connecting to the thermal management system. This is a conventional technical means in this field and will not be described in detail here.

[0027] Specifically, the motor radiator 3 adopts a finned tube radiator, and the motor radiator 3 is equipped with a cooling fan to improve heat dissipation efficiency.

[0028] Specifically, such as Figure 1 The motor cooling circuit also includes a temperature sensor 13 connected in series. The temperature sensor 13 is connected to the cooling fan, three-way valve A4, and three-way valve B7 via a controller. The temperature sensor 13 is a resistive sensor. The controller can be a PLC controller. The temperature sensor 13 is used to detect the water temperature, so as to automatically adjust the working intensity of the cooling fan according to the water temperature, and to control the on / off state of three-way valve A4 and three-way valve B7 according to the water temperature, thereby realizing the switching between the series and parallel states of the motor cooling circuit and the battery cooling circuit.

[0029] Specifically, such as Figure 1 The three-way valve A4 is directly connected to one end of the water inlet of the battery cooling heat exchanger 8, and the three-way valve B7 is directly connected to the other end of the water inlet of the battery cooling heat exchanger 8. Direct connection means that it is not connected to the battery cooling heat exchanger 8 through other components other than pipes. The battery cooling heat exchanger 8 is a plate heat exchanger.

[0030] Specifically, such as Figure 1 Both three-way valves A4 and B7 are electrically operated three-way valves. Three-way valve A4 includes ports V1, V2, and V3. Port V1 of valve A4 is connected to the water inlet of kettle A5, port V2 is connected to the water inlet of motor radiator 3, and port V3 is connected to the water inlets of kettle B9 and battery cooling heat exchanger 8. Three-way valve B7 has port V1 connected to the water inlet of water pump B6, port V2 connected to another water inlet of battery cooling heat exchanger 8, and port V3 connected to the water inlets of motor 2 and motor radiator 3. The on / off state of the three-way valve ports is controlled by sending different duty cycle signals to electric three-way valves A4 and B7.

[0031] Specifically, kettles A5 and B9 contain coolant, which is a 40% ethylene glycol aqueous solution.

[0032] Specifically, heater 11 is a PTC heater.

[0033] The bus thermal management system with integrated motor waste heat recovery operates as follows:

[0034] (1) When the ambient temperature is high, the motor cooling circuit and the battery cooling circuit are connected in parallel and cool the motor 2 and the power battery 10 respectively. At this time, the V2 port of the electric three-way valve A4 and the electric three-way valve B7 are fully open, and the V3 port is closed. The water flow direction of the motor cooling circuit is as follows: water pump A1, multi-function module 12, motor 2, temperature sensor 13, motor radiator 3, electric three-way valve A4, and kettle A5. The fan speed in the motor cooling circuit can be controlled according to the water temperature (detected by temperature sensor 13). When the water temperature reaches t1, the fan starts; when the water temperature reaches t2, the fan runs at full speed; and when the water temperature reaches t3, the fan stops. The water flow direction of the battery cooling circuit is as follows: water pump B6, heater 11, power battery 10, kettle B9, battery cooling heat exchanger 8, and electric three-way valve B7. Among them, the battery cooling heat exchanger 8 is integrated into the air conditioner. Figure 1 The relevant parts of the air conditioning piping have been omitted.

[0035] (2) When the ambient temperature is low, the motor cooling circuit and the battery cooling circuit are connected in series to recover the waste heat of the motor and heat the power battery 10. At this time, the V3 port of the electric three-way valve A4 and the electric three-way valve B7 are fully open, and the V2 port is closed. The water flow direction is as follows: water pump A1, multi-function module 12, motor 2, electric three-way valve B7, water pump B6, heater 11, power battery 10, kettle B9, electric three-way valve A4, and kettle A5. In order to achieve the best heat exchange effect, when the ambient temperature is ≥T E When the ambient temperature is below T, heater 11 does not operate, and waste heat from the motor is used to heat the power battery 10; when the ambient temperature is below T... E When the temperature reaches t4, the heater 11 heats up the battery 10 in combination with the waste heat from the motor. When the outlet water temperature of the motor 2 reaches t4, the three-way valves A4 and B7 connect the motor cooling circuit and the battery cooling circuit in parallel, stopping the heating of the power battery 10.

[0036] Example 2

[0037] An electric bus includes a bus thermal management system for integrated motor waste heat recovery disclosed in Embodiment 1.

[0038] The above are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent.

Claims

1. A bus thermal management system integrating motor waste heat recovery, characterized in that, include: The motor cooling circuit includes a water pump A, a motor, a motor radiator, a three-way valve A, and a water tank A connected in series. The battery cooling circuit includes a water pump B, a three-way valve B, a battery cooling heat exchanger, a water tank B, a power battery, and a heater connected in series. The motor cooling circuit and the battery cooling circuit are coupled in series and parallel through the three-way valve A and the three-way valve B.

2. The bus thermal management system with integrated motor waste heat recovery according to claim 1, characterized in that, The motor cooling circuit also includes a multi-function module connected in series.

3. The bus thermal management system with integrated motor waste heat recovery according to claim 1, characterized in that, The motor radiator is equipped with a cooling fan.

4. The bus thermal management system with integrated motor waste heat recovery according to claim 3, characterized in that, The motor cooling circuit also includes a temperature sensor connected in series, which is connected to the cooling fan's electrical control signal via a controller.

5. The bus thermal management system with integrated motor waste heat recovery according to claim 1, characterized in that, The three-way valve A is directly connected to one end of the water inlet of the battery cooling heat exchanger, and the three-way valve B is directly connected to the other end of the water inlet of the battery cooling heat exchanger.

6. An electric bus, characterized in that, The bus thermal management system includes the integrated motor waste heat recovery system as described in any one of claims 1-5.

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