CN107199879B - Expansion tank sharing system of new energy automobile and new energy automobile - Google Patents

Expansion tank sharing system of new energy automobile and new energy automobile Download PDF

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Publication number
CN107199879B
CN107199879B CN201710270526.5A CN201710270526A CN107199879B CN 107199879 B CN107199879 B CN 107199879B CN 201710270526 A CN201710270526 A CN 201710270526A CN 107199879 B CN107199879 B CN 107199879B
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water
battery
motor
waterway
expansion
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CN107199879A (en
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陆群
张宇
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CH Auto Technology Co Ltd
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CH Auto Technology Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K11/00—Arrangement in connection with cooling of propulsion units
    • B60K11/02—Arrangement in connection with cooling of propulsion units with liquid cooling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/615—Heating or keeping warm
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6567—Liquids
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6567—Liquids
    • H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/66—Heat-exchange relationships between the cells and other systems, e.g. central heating systems or fuel cells
    • H01M10/663—Heat-exchange relationships between the cells and other systems, e.g. central heating systems or fuel cells the system being an air-conditioner or an engine
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • H02K9/193—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil with provision for replenishing the cooling medium; with means for preventing leakage of the cooling medium
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The embodiment of the invention discloses an expansion water tank sharing system of a new energy automobile and the new energy automobile. The method comprises the following steps: a motor waterway; a battery waterway; the water mixing branch pipe is positioned between the motor water channel and the battery water channel; the water return branch pipe is positioned between the motor waterway and the battery waterway; the expansion water tank comprises a first water return pipe, a second water return pipe and an exhaust pipe; wherein the exhaust pipe is connected to a motor water path, the first water return pipe is connected to the motor water path, and the second water return pipe is connected to the battery water path. In the embodiment of the invention, the shared expansion water tank is used for simultaneously providing the liquid storage and exhaust functions for the motor water path and the battery water path, so that the capacity and the weight of cooling liquid are reduced, the structure and the mounting bracket required for mounting the expansion water tank are saved, and the weight and the cost of the whole vehicle are also reduced.

Description

Expansion tank sharing system of new energy automobile and new energy automobile
Technical Field
The invention relates to the technical field of automobiles, in particular to an expansion water tank sharing system of a new energy automobile and the new energy automobile.
Background
The shortage of energy, the petroleum crisis and the environmental pollution are getting more and more severe, which brings great influence to the life of people and is directly related to the sustainable development of national economy and society. New energy technologies are actively developed in all countries of the world. An electric vehicle is considered as an important approach to solve energy crisis and environmental deterioration as a new energy vehicle with reduced oil consumption, low pollution and low noise. The hybrid electric vehicle has the advantages of both a pure electric vehicle and a traditional internal combustion engine vehicle, effectively improves fuel economy and reduces emission on the premise of meeting the requirements of vehicle dynamic property and driving range, and is considered to be one of the effective paths of energy conservation and emission reduction at present.
The comprehensive heat management system is applied to new energy vehicles and is used for communicating and comprehensively controlling a motor cooling pipeline and a battery heat management pipeline. In the current comprehensive heat management system, in view of mutual independence of the motor cooling pipeline and the battery heat management pipeline, respective liquid storage and air exhaust requirements of the motor cooling pipeline and the battery heat management pipeline are considered, and two expansion water tanks are utilized to respectively provide liquid storage and air exhaust functions for the motor cooling pipeline and the battery heat management pipeline.
However, the two expansion water tanks are used for respectively providing a liquid storage and air exhaust function for the motor cooling pipeline and the battery thermal management pipeline, so that the capacity and the weight of the cooling liquid are increased. Moreover, the structure and the mounting bracket required for mounting the expansion water tank are added, so that the weight and the cost of the whole vehicle are increased.
Disclosure of Invention
The invention aims to provide an expansion water tank sharing system of a new energy automobile and the new energy automobile, and the capacity and the weight of cooling liquid are reduced.
An expansion tank sharing system of a new energy automobile comprises:
a motor waterway;
a battery waterway;
the water mixing branch pipe is positioned between the motor water channel and the battery water channel;
the water return branch pipe is positioned between the motor waterway and the battery waterway;
the expansion water tank comprises a first water return pipe, a second water return pipe and an exhaust pipe;
wherein the exhaust pipe is connected to a motor water path, the first water return pipe is connected to the motor water path, and the second water return pipe is connected to the battery water path.
In one embodiment, the exhaust pipe is connected to a connection point of the water mixing branch pipe and the water way of the motor; the second water return pipe is connected to a connection point of the water mixing branch pipe and the battery waterway; when the expansion water tank is detached, the water pressure at the connecting point of the exhaust pipe and the water path of the motor is higher than the water pressure at the connecting point of the second water return pipe and the water path of the battery, and the water pressure at the connecting point of the second water return pipe and the water path of the battery is higher than the water pressure at the connecting point of the first water return pipe and the water path of the motor.
In one embodiment, the branch pipe of the exhaust pipe is directed vertically upward, and the branch pipe of the second return pipe is directed vertically upward.
In one embodiment:
the motor waterway comprises a motor waterway water pump;
and the branch pipe of the first water return pipe is close to the water pump inlet of the motor waterway.
In one embodiment, further comprising:
the first valve is arranged on the water return branch pipe;
and the second valve is arranged on the water mixing branch pipe.
In one embodiment, the expansion tank is a pressure type expansion tank, a normal pressure type expansion tank or an open type expansion tank.
In one embodiment, the battery waterway comprises: a battery water path temperature sensor; a positive temperature coefficient heater; a battery box; battery water route water pump.
In one embodiment, the motor waterway comprises: a motor waterway pump; a motor; a motor heat sink assembly.
In one embodiment, the first valve is an opening-controllable valve and the second valve is an opening-controllable valve.
A new energy automobile comprises the expansion water tank sharing system of the new energy automobile.
As can be seen from the above technical solutions, the embodiment of the present invention includes: a motor waterway; a battery waterway; the water mixing branch pipe is positioned between the motor waterway and the battery waterway; the water return branch pipe is positioned between the motor waterway and the battery waterway; the expansion water tank comprises a first water return pipe, a second water return pipe and an exhaust pipe; wherein the blast pipe is connected to the motor water route, and first return pipe is connected to the motor water route, and the second return pipe is connected to the battery water route. Therefore, in the embodiment of the invention, the shared expansion water tank is used for simultaneously providing the liquid storage and exhaust functions for the battery water channel and the battery water channel, the capacity and the weight of cooling liquid are reduced, the structure and the mounting bracket required for mounting the expansion water tank are saved, and the weight and the cost of the whole vehicle are reduced.
In addition, in the embodiment of the invention, the high-temperature cooling liquid in the motor water path can spontaneously flow into the battery water path to heat the power battery, so that the motor waste heat recovery is realized. According to the embodiment of the invention, a water pump is not required to be adopted on the water mixing branch pipe to provide power for the high-temperature cooling liquid of the motor pipeline, so that the weight and the energy consumption of the system can be reduced.
In addition, the motor water path and the battery water path can be implemented in various forms, and the water path and the battery water path are suitable for various working requirement environments.
Drawings
The following drawings are only schematic illustrations and explanations of the present invention, and do not limit the scope of the present invention.
Fig. 1 is a structural diagram of a new energy automobile motor coolant heat energy recovery system according to the present invention.
Fig. 2 is an exemplary configuration diagram of an expansion tank sharing system of a new energy vehicle according to a first embodiment of the present invention.
Fig. 3 is an exemplary configuration diagram of an expansion tank sharing system of a new energy vehicle according to a second embodiment of the present invention.
Fig. 4 is an exemplary configuration diagram of an expansion tank sharing system of a new energy vehicle according to a third embodiment of the present invention.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings, in which like reference numerals refer to like parts throughout.
For simplicity and clarity of description, the invention will be described below by describing several representative embodiments. Numerous details of the embodiments are set forth to provide an understanding of the principles of the invention. It will be apparent, however, that the invention may be practiced without these specific details. Some embodiments are not described in detail, but rather are merely provided as frameworks, in order to avoid unnecessarily obscuring aspects of the invention. Hereinafter, "including" means "including but not limited to", "according to … …" means "at least according to … …, but not limited to … … only". In view of the language convention of chinese, the following description, when it does not specifically state the number of a component, means that the component may be one or more, or may be understood as at least one.
In the embodiment of the invention, a design scheme of the position of the expansion water tank of the comprehensive heat management system of the new energy automobile is provided, so that the number of the expansion water tanks of the comprehensive heat management system can be reduced to one, and a liquid storage and air exhaust function is provided for a motor cooling pipeline and a battery heat management pipeline simultaneously.
In addition, in the embodiment of the invention, a new energy automobile motor coolant heat energy recovery system is further provided, and by reasonably setting the positions of the water pump, the valve and the water mixing branch pipe in the pipeline, the high-temperature coolant in the motor cooling pipeline (namely, the motor water channel) spontaneously flows into the power battery heat management pipeline (namely, the battery water channel) to heat the power battery so as to realize motor waste heat recovery. According to the embodiment of the invention, a water pump is not required to be adopted on the water mixing branch pipe to provide power for the high-temperature cooling liquid of the motor pipeline, so that the weight and the energy consumption of the system can be reduced.
Fig. 1 is a structural diagram of a new energy automobile motor coolant heat energy recovery system according to the present invention.
As shown in fig. 1, the coolant heat energy recovery system includes:
a motor waterway;
a battery waterway;
the water mixing branch pipe is positioned between the motor waterway and the battery waterway and is used for introducing water in the motor waterway into the battery waterway;
the water return branch pipe is positioned between the motor waterway and the battery waterway and is used for guiding water in the battery waterway back to the motor waterway;
the water pressure at the connecting point (namely point Q) of the water mixing branch pipe and the motor water channel is higher than the water pressure at the connecting point (namely point W) of the water mixing branch pipe and the battery water channel, and the water pressure at the connecting point (namely point R) of the water return branch pipe and the battery water channel is higher than the water pressure at the connecting point (namely point E) of the water return branch pipe and the motor water channel.
It can be seen that since the water pressure at the point Q is higher than that at the point W, and the water pressure at the point R is higher than that at the point E, the high-temperature coolant in the motor water channel can spontaneously flow into the battery water channel to heat the power battery so as to realize the motor waste heat recovery coolant.
In one embodiment, a valve is also included that is disposed in the mixing leg. Preferably, the valve arranged in the mixing branch is an opening controllable valve. More preferably, the opening degree controllable valve is a one-way cut-off opening degree controllable valve or a two-way cut-off opening degree controllable valve. A speed regulating valve can be further arranged in the water mixing branch pipe.
In one embodiment, a valve is also included that is disposed in the return water branch. Preferably, the valve disposed in the return water branch pipe is an opening-controllable valve. More preferably, the opening degree controllable valve is a one-way cut-off opening degree controllable valve or a two-way cut-off opening degree controllable valve.
In one embodiment, the battery waterway comprises: a battery water path temperature sensor; a positive temperature coefficient heater; a battery box; a battery waterway water pump; battery water route flow sensor.
In one embodiment, the battery waterway comprises: a battery water path temperature sensor; a positive temperature coefficient heater; a battery box; a battery waterway water pump; a battery waterway flow sensor; a battery heat sink assembly; a reversing valve.
In one embodiment, the motor waterway comprises: a motor waterway pump; a motor waterway temperature sensor; a motor waterway flow sensor; a motor heat sink assembly.
While the above exemplary description describes typical examples of valves, battery water circuits, and motor water circuits, those skilled in the art will appreciate that this description is exemplary only, and is not intended to limit the scope of embodiments of the present invention.
In the embodiment of the invention, a bench test or simulation analysis can be firstly utilized to analyze the system flow and pressure of a thermal management system pipeline (comprising a motor water channel and a battery water channel) when no expansion water tank exists, and the following two characteristic points are determined on the main pipeline: point Q: the pressure of a cooling pipeline of the motor is high; point W: and the pressure of the battery thermal management pipeline is low. Wherein, the absolute pressure of the two is in the order of: q > W. The purpose is as follows: when the two are communicated, the liquid in the pipeline can spontaneously flow from the point Q to the point W. Then, a mixing branch pipe is arranged at the point Q and is connected with the point W, and a valve is arranged on the mixing branch pipe.
In addition, the following two characteristic points are determined on the main pipeline: e, point: the pressure of a motor cooling pipeline is low; point R: the battery thermal management pipeline pressure high point. Wherein, the absolute pressure of the two is in the order of: r > E. The purpose is as follows: when the two are communicated, the liquid in the pipeline can spontaneously flow from the point R to the point E. Then, a water return branch pipe is arranged at the point E and is connected with the point R, and a valve is arranged on the water return branch pipe.
Then, the flow and the pressure of the water mixing branch pipe and the water return branch pipe are confirmed by using a bench test, and the system pipeline can realize the following states:
(a) when the valve of the water mixing branch pipe is completely opened, the liquid at the point Q continuously flows to the point W, and no countercurrent flows;
(b) when the return water branch pipe valve is completely opened, the liquid at the point R continuously flows to the point E without countercurrent;
(c) when the valve of the water mixing branch pipe is partially opened, the flow from the point Q to the point W is reduced.
Embodiments of the present invention may be applied in numerous specific environments based on specific needs.
Fig. 2 is an exemplary configuration diagram of an expansion tank sharing system of a new energy vehicle according to a first embodiment of the present invention.
As shown in fig. 2, the thermal management system includes: a motor waterway 1; a battery waterway 2; and an alternating water path 3 between the motor water path 1 and the battery water path 2. The ac water path 3 introduces heat of the motor water path 1 into the battery water path 2. The alternating-current waterway 3 comprises a water mixing branch pipe and a water return branch pipe.
Specifically, the motor waterway 1 includes: a motor waterway water pump P1; a motor; a motor heat sink assembly (including a motor heat sink and a fan). The battery water path 2 includes: a temperature sensor T; a Positive Temperature Coefficient (PTC) heater; a battery waterway water pump P2; a battery box.
When no expansion tank is present:
(1) if the motor water route 1 is disconnected with the alternating current water route 3 (for example, disconnection valve V1, disconnection valve V2), after the motor water route water pump P1 is opened, the main water route operation track of the motor water route 1 is: the motor waterway water pump P1 → the motor radiator component → the motor waterway water pump P1, thereby constituting a complete energy transfer circuit of the motor.
(2) If the battery waterway 2 is disconnected from the ac waterway 3 (for example, the valve V1 is opened, the valve V2 is opened), after the battery waterway water pump P2 is opened, the waterway operation track of the battery waterway 2 is: the battery waterway water pump P2 → the battery box → the battery waterway temperature sensor T → the PTC heater → the battery waterway water pump P2, thereby constituting a complete energy transfer circuit of the battery box.
(3) When the valve V1 and the valve V2 are both connected, and after the motor waterway water pump P1 is opened, the main waterway operation track of the motor waterway 1 is: the motor waterway water pump P1 → the motor radiator component → the motor waterway water pump P1, thereby constituting a complete energy transfer circuit of the motor. Additionally, at point a (where a three-way connection may be provided), a portion of the water passes through valve V1 to the battery water path 2. When the battery waterway water pump P2 is turned on, the waterway operation track of the battery waterway 2 is: the battery waterway water pump P2 → the battery box → the battery waterway temperature sensor T → the PTC heater → the battery waterway water pump P2, thereby constituting a complete energy transfer circuit of the battery box. In addition, after a part of water comes out of the battery box, the water reaches the motor water path 1 through a valve V2.
Analyzing the system flow and pressure of the pipeline of the comprehensive heat management system in the absence of an expansion water tank by utilizing a bench test or simulation analysis, and determining the following three characteristic points on the main pipeline
And (B) point A: the pressure of a motor waterway is high; and B, point: the motor waterway pressure is low; and C, point: the battery water way pressure is low. Wherein, the absolute pressure magnitude order of the three is: a > C > B. The purpose is as follows: if when the three are communicated together, the liquid in the pipeline can spontaneously flow from the point A and the point C to the point B, and the flow rate of the point A flowing to the point B is greater than the flow rate of the point C flowing to the point B. Then, a branch pipe is arranged at the point A and is connected with an exhaust pipe at the top of the expansion water tank; a branch pipe is arranged at the point B and is connected with a first return pipe at the bottom of the expansion water tank; and a branch pipe is arranged at the point C and is connected with a second water return pipe at the bottom of the expansion water tank. Structurally, the following requirements are ensured: the direction of the branch pipe at the point A is vertically upward; the branch pipe at the point B is as close as possible to the inlet of a certain water pump (such as P1) on the motor cooling pipeline; the direction of the branch pipe at the point C is vertically upward; the liquid level of the expansion tank is higher than the highest point of the pipeline.
The system flow and pressure of the pipeline of the comprehensive heat management system in the expansion water tank are confirmed by using a bench test, and the system pipeline can realize the following states:
(a) the liquid in the motor cooling pipeline continuously flows to the expansion water tank from the point A, and the flow is not more than one tenth of the flow of the main pipeline.
(b) The liquid in the expansion tank is continuously flowing to point B and the flow rate should be almost equal to the flow rate flowing to the expansion tank at point a.
(c) The pipe from the expansion tank to point C should be filled with coolant, and the flow rate during operation of the system should be almost zero except for the instantaneous flow rate from point C to the expansion tank at the initial stage of operation of the water pump in the system.
After the expansion tank is connected in the above manner (for example, the expansion tank is a pressure type expansion tank, a normal pressure type expansion tank or an open type expansion tank, etc.):
(1) when the motor water path 1 is disconnected from the ac water path 3 (for example, the disconnection valve V1 and the disconnection valve V2), after the motor water path water pump P1 is opened, the main water path operation track of the motor water path 1 is: the motor waterway water pump P1 → the motor radiator component → the motor waterway water pump P1, thereby constituting a complete energy transfer circuit of the motor. Furthermore, at point a (where a three-way connection may be provided), a portion of the water passes through the exhaust pipe to the expansion tank and via the expansion tank and the first return pipe to point B (where a three-way connection may be provided). The expansion tank has the functions of storing liquid and exhausting air for the motor waterway 1.
(2) When the battery waterway 2 is disconnected from the ac waterway 3 (for example, the valve V1 is turned off, and the valve V2 is turned off), after the battery waterway water pump P2 is turned on, the waterway operation trajectory of the battery waterway 2 is: the battery waterway water pump P2 → the battery box → the battery waterway temperature sensor T → the PTC heater → the battery waterway water pump P2, thereby constituting a complete energy transfer circuit of the battery box. Also, at point C (where a three-way connection may be provided), a portion of the water reaches the expansion tank via the second water return pipe, and reaches point B (where a three-way connection may be provided) via the expansion tank and the first water return pipe. The expansion tank has the functions of storing liquid and exhausting air for the battery water path 2.
(3) When the valve V1 and the valve V2 are both connected, and after the motor waterway water pump P1 is opened, the main waterway operation track of the motor waterway 1 is: the motor waterway water pump P1 → the motor radiator component → the motor waterway water pump P1, thereby constituting a complete energy transfer circuit of the motor. Furthermore, at point a (where a three-way connection may be provided), a portion of the water passes through the expansion tank and the first return line to point B (where a three-way connection may be provided). The expansion tank has the functions of storing liquid and exhausting air for the motor waterway 1. Additionally, at point a (where a three-way connection may be provided), a portion of the water passes through valve V1 to the battery water path 2. When the battery waterway water pump P2 is turned on, the waterway operation track of the battery waterway 2 is: the battery waterway water pump P2 → the battery box → the battery waterway temperature sensor T → the PTC heater → the battery waterway water pump P2, thereby constituting a complete energy transfer circuit of the battery box. And, in point C (this department can set up the tee bend interface), partly water reaches expansion tank through the second wet return, and expansion tank plays the stock solution exhaust function for battery water route 2. In addition, after a part of water comes out of the battery box, the water reaches the motor water path 1 through a valve V2. It can be seen that the expansion tank has the functions of storing liquid and exhausting gas for the motor water path 1 and the battery water path 2 together.
Fig. 3 is an exemplary configuration diagram of an expansion tank sharing system of a new energy vehicle according to a second embodiment of the present invention.
As shown in fig. 3, the thermal management system includes: a motor waterway 1; a battery waterway 2; and an alternating water path 3 between the motor water path 1 and the battery water path 2. The ac water path 3 introduces heat of the motor water path 1 into the battery water path 2. The alternating-current waterway 3 comprises a water mixing branch pipe and a water return branch pipe.
Specifically, the motor waterway 1 includes: a motor waterway water pump P1; a motor; a motor waterway flow sensor F1; a motor water path temperature sensor T1; a motor heat sink assembly. The battery water path 2 includes: a battery water path temperature sensor T2; a PTC heater; a battery box; a battery waterway water pump P2; a battery waterway flow sensor F2; a battery heat sink assembly; and a reversing valve V3. The ac waterway flow sensor F3 is connected to the selector valve V3. The first reversing end of the reversing valve V3 is connected with the water inlet of the battery radiator assembly, and the second reversing end of the reversing valve V3 is connected with the water outlet of the battery radiator assembly.
The alternating-current waterway 3 comprises a water mixing branch pipe and a water return branch pipe. The water pressure at the connecting point of the water mixing branch pipe and the motor water channel 1 is higher than that at the connecting point of the water mixing branch pipe and the battery water channel 2; the water pressure at the connecting point of the water return branch pipe and the battery water channel 2 is higher than that at the connecting point of the water return branch pipe and the motor water channel 1.
When no expansion tank is present:
(1) when the motor water path 1 is disconnected from the ac water path 2 (for example, the disconnection valve V1 and the disconnection valve V2), after the motor water path water pump P1 is opened, the water path operation track of the motor water path 1 is: the motor waterway water pump P1 → the electric motor → the motor waterway flow sensor F1 → the motor waterway temperature sensor T1 → the motor radiator assembly → the motor waterway water pump P1, thereby forming a complete energy transfer loop of the electric motor.
(2) When the battery waterway 2 is disconnected from the alternating current waterway 3, after the battery waterway water pump P2 is opened, the waterway running track of the battery waterway 2 is divided into two situations:
(a) when the battery box does not need heat dissipation: the battery water path water pump P2 → the battery water path flow sensor F2 → the reversing valve V3 → the battery water path temperature sensor T2 → the PTC heater → the battery box, thereby forming a complete energy transfer loop of the battery box, and at the moment, the battery radiator assembly is not used for radiating heat for the battery box.
(b) When the battery box needs to dissipate heat, the battery waterway water pump P2 → the battery waterway flow sensor F2 → the battery radiator assembly → the reversing valve V3 → the battery waterway temperature sensor T2 → the PTC heater → the battery box, so that a complete energy transfer loop of the battery box is formed, and the battery radiator assembly is used for dissipating heat for the battery box.
In the present invention, the motor water path 1 is further connected to the battery water path 2 via the ac water path 3.
The alternating-current water path 3 includes: the switch valve V1 is connected with the water outlet of the motor waterway 1; a speed control valve P3 connected to the on-off valve V1; a one-way stop valve V2 connected with the water return port of the motor water path 2; and an alternating-current waterway flow sensor F3 connected with the one-way stop valve V2. The function of the one-way stop valve V2 is to prevent the hot water in the motor water path from flowing into the battery water path when it is not necessary to heat the battery. The ac waterway flow sensor F3 is connected to the selector valve V3.
In the present invention, the rotation speed of the speed control valve P3 is controlled based on the temperature detection value of the battery water path temperature sensor T2. When the temperature detection value of the battery water path temperature sensor T2 is low (for example, lower than a preset low temperature threshold value), it is determined that heat needs to be supplied to the battery water path 2, and at this time, the rotation speed of the speed regulating valve P3 is increased, so that the heat of the motor water path 1 is transferred to the battery water path 2. When the temperature detection value of the battery water path temperature sensor T2 is high (for example, higher than a preset high temperature threshold value), it is determined that no heat needs to be supplied to the battery water path 2, and therefore the rotation speed of the speed regulating valve P3 may be reduced or stopped, so as to reduce or stop the heat transfer from the motor water path 1 to the battery water path 2.
When the battery pack needs to be heated, the battery radiator assembly is cut off by the reversing valve V3, the motor water pump P1 and the battery water pump P2 are both opened, the switch valve V1 and the speed regulating valve P3 are opened, and the water path running track of the thermal management system is as follows: the motor waterway water pump P1 → the motor waterway flow sensor F1 → the motor waterway temperature sensor T1 → the switch valve V1 → the speed control valve P3 → the battery waterway temperature sensor T2 → the PTC heater → the battery box → the battery waterway water pump P2 → the battery waterway flow sensor F2 → the change-over valve V3 → the alternating waterway flow sensor F3 → the one-way stop valve V2 → the motor radiator assembly → the motor waterway water pump P1, thereby constituting a complete circuit.
If the speed regulating pump P3 reaches the maximum rotating speed and still cannot meet the heating requirement of the battery box, the PTC heater of the battery water path 3 can be further started, so that the PTC heater further provides heat for the battery box.
Specifically, the method comprises the following steps: during the running of the vehicle, the motor is in working state and the motor waterway water pump P1 is continuously operated, so that the water temperature of the motor waterway 1 is rapidly increased and maintained at a high water temperature (for example, 70-90 ℃). If the battery pack needs to be heated at this time, the water pump P2 of the battery water path is started, the switch valve V1 and the speed regulating valve P3 are opened, and the rotating speed of the speed regulating pump P3 is controlled according to the temperature measured by the motor water path temperature sensor T1, so that the battery pack can meet the heating requirement of the battery box (for example, the water temperature reaches 30 ℃). If the speed regulating pump P3 reaches the maximum rotating speed and still cannot meet the heating requirement of the battery box, the PTC heater of the battery water path 3 is started, so that heat is further provided for the battery box.
Analyzing the system flow and pressure of the pipeline of the comprehensive heat management system in the absence of an expansion water tank by utilizing a bench test or simulation analysis, and determining the following three characteristic points on the main pipeline
And (B) point A: the pressure of a motor waterway is high; and B, point: the motor waterway pressure is low; and C, point: the battery water way pressure is low. Wherein, the absolute pressure magnitude order of the three is: a > C > B. The purpose is as follows: if when the three are communicated together, the liquid in the pipeline can spontaneously flow from the point A and the point C to the point B, and the flow rate of the point A flowing to the point B is greater than the flow rate of the point C flowing to the point B. Then, a branch pipe is arranged at the point A and is connected with an exhaust pipe at the top of the expansion water tank; a branch pipe is arranged at the point B and is connected with a first return pipe at the bottom of the expansion water tank; and a branch pipe is arranged at the point C and is connected with a second water return pipe at the bottom of the expansion water tank. Structurally, the following requirements are ensured: the direction of the branch pipe at the point A is vertically upward; the branch pipe at the point B is as close as possible to the inlet of a certain water pump (such as P1) on the motor cooling pipeline; the direction of the branch pipe at the point C is vertically upward; the liquid level of the expansion tank is higher than the highest point of the pipeline.
The system flow and pressure of the pipeline of the comprehensive heat management system in the expansion water tank are confirmed by using a bench test, and the system pipeline can realize the following states:
(a) the liquid in the motor cooling pipeline continuously flows to the expansion water tank from the point A, and the flow is not more than one tenth of the flow of the main pipeline.
(b) The liquid in the expansion tank is continuously flowing to point B and the flow rate should be almost equal to the flow rate flowing to the expansion tank at point a.
(c) The pipe from the expansion tank to point C should be filled with coolant, and the flow rate during operation of the system should be almost zero except for the instantaneous flow rate from point C to the expansion tank at the initial stage of operation of the water pump in the system.
After the expansion water tank is connected according to the above mode:
(1) when the motor water path 1 is disconnected from the ac water path 2 (for example, the disconnection valve V1 and the disconnection valve V2), after the motor water path water pump P1 is opened, the water path operation track of the motor water path 1 is: the motor waterway water pump P1 → the electric motor → the motor waterway flow sensor F1 → the motor waterway temperature sensor T1 → the motor radiator assembly → the motor waterway water pump P1, thereby forming a complete energy transfer loop of the electric motor. Furthermore, at point a (where a three-way connection may be provided), a portion of the water passes through the exhaust pipe to the expansion tank and via the expansion tank and the first return pipe to point B (where a three-way connection may be provided). The expansion tank has the functions of storing liquid and exhausting air for the motor waterway 1.
(2) When the battery waterway 2 is disconnected from the alternating current waterway 3, after the battery waterway water pump P2 is opened, the waterway running track of the battery waterway 2 is divided into two situations:
(a) when the battery box does not need heat dissipation: the battery water path water pump P2 → the battery water path flow sensor F2 → the reversing valve V3 → the battery water path temperature sensor T2 → the PTC heater → the battery box, thereby forming a complete energy transfer loop of the battery box, and at the moment, the battery radiator assembly is not used for radiating heat for the battery box. Also, at point C (where a three-way connection may be provided), a portion of the water reaches the expansion tank via the second water return pipe, and reaches point B (where a three-way connection may be provided) via the expansion tank and the first water return pipe. The expansion tank has the functions of storing liquid and exhausting air for the battery water path 2.
(b) When the battery box needs to dissipate heat, the battery waterway water pump P2 → the battery waterway flow sensor F2 → the battery radiator assembly → the reversing valve V3 → the battery waterway temperature sensor T2 → the PTC heater → the battery box, so that a complete energy transfer loop of the battery box is formed, and the battery radiator assembly is used for dissipating heat for the battery box. Also, at point C (where a three-way connection may be provided), a portion of the water reaches the expansion tank via the second water return pipe, and reaches point B (where a three-way connection may be provided) via the expansion tank and the first water return pipe. The expansion tank has the functions of storing liquid and exhausting air for the battery water path 2.
(3) When both valve V1 and valve V2 are open:
after the water pump P1 of the motor waterway is opened, the main waterway operation track of the motor waterway 1 is: the motor waterway water pump P1 → the electric motor → the motor waterway flow sensor F1 → the motor waterway temperature sensor T1 → the motor radiator assembly → the motor waterway water pump P1, thereby forming a complete energy transfer loop of the electric motor. Furthermore, at point a (where a three-way connection may be provided), a portion of the water passes through the exhaust pipe to the expansion tank and via the expansion tank and the first return pipe to point B (where a three-way connection may be provided). The expansion tank has the functions of storing liquid and exhausting air for the motor waterway 1. Additionally, at point a (where a three-way connection may be provided), a portion of the water passes through valve V1 to the battery water path 2.
After the battery waterway water pump P2 is started, (a) when the battery box does not need to dissipate heat: the battery water path water pump P2 → the battery water path flow sensor F2 → the reversing valve V3 → the battery water path temperature sensor T2 → the PTC heater → the battery box, thereby forming a complete energy transfer loop of the battery box, and at the moment, the battery radiator assembly is not used for radiating heat for the battery box. And, in point C (this place can set up the tee junction), some water reaches expansion tank through the second return pipe to reach point B (this place can set up the tee junction) through expansion tank and first return pipe, expansion tank plays the stock solution exhaust function for battery water route 2. (b) When the battery box needs to dissipate heat, the battery waterway water pump P2 → the battery waterway flow sensor F2 → the battery radiator assembly → the reversing valve V3 → the battery waterway temperature sensor T2 → the PTC heater → the battery box, so that a complete energy transfer loop of the battery box is formed, and the battery radiator assembly is used for dissipating heat for the battery box. And, in point C (this place can set up the tee junction), some water reaches expansion tank through the second return pipe to reach point B (this place can set up the tee junction) through expansion tank and first return pipe, expansion tank plays the stock solution exhaust function for battery water route 2.
Fig. 4 is an exemplary configuration diagram of an expansion tank sharing system of a new energy vehicle according to a third embodiment of the present invention.
As shown in fig. 4, the thermal management system includes: a motor waterway 1; a battery waterway 2; and an alternating water path 3 between the motor water path 1 and the battery water path 2. The ac water path 3 introduces heat of the motor water path 1 into the battery water path 2. The alternating-current waterway 3 comprises a water mixing branch pipe and a water return branch pipe.
Specifically, the motor waterway 1 includes: a motor waterway water pump P1; a motor; a motor waterway flow sensor F1; a motor water path temperature sensor T1; a motor heat sink assembly; . The battery water path 2 includes: a battery water path temperature sensor T2; a PTC heater; a battery box; a battery waterway water pump P2; a battery waterway flow sensor F2; a battery heat sink assembly; and a reversing valve V3. The ac waterway flow sensor F3 is connected to the selector valve V3. The first reversing end of the reversing valve V3 is connected with the water inlet of the battery radiator assembly, and the second reversing end of the reversing valve V3 is connected with the water outlet of the battery radiator assembly.
The alternating-current waterway 3 comprises a water mixing branch pipe and a water return branch pipe. The water pressure of the connecting point of the water mixing branch pipe and the motor water channel 1 is higher than that of the connecting point of the water mixing branch pipe and the battery water channel 2, and the water pressure of the connecting point of the water return branch pipe and the battery water channel 2 is higher than that of the connecting point of the water return branch pipe and the motor water channel 1.
Moreover, the thermal management system further comprises: a refrigeration circuit 4 and a heat exchanger. The alternating-current waterway flow sensor F3 is connected with the water outlet of the reversing valve V3; the heat exchanger is connected to the water outlet of the battery radiator assembly, the refrigeration circuit 4 and the reversing valve V3, respectively.
When no expansion tank is present:
(1) when the motor waterway 1 is disconnected with the alternating current waterway 2, and after the motor waterway water pump P1 is started, the waterway running track of the motor waterway 1 is as follows: the motor waterway water pump P1 → the electric motor → the motor waterway flow sensor F1 → the motor waterway temperature sensor T1 → the motor radiator assembly → the motor waterway water pump P1, thereby forming a complete energy transfer loop of the electric motor.
(2) When the battery waterway 2 is disconnected from the alternating current waterway 3, after the battery waterway water pump P2 is opened, the waterway running track of the battery waterway 2 is divided into three situations:
(a) when the battery box does not need heat dissipation: the battery water path water pump P2 → the battery water path flow sensor F2 → the reversing valve V3 → the battery water path temperature sensor T2 → the PTC heater → the battery box, thereby forming a complete energy transfer loop of the battery box, and at the moment, the battery radiator assembly and the refrigeration loop 4 are not utilized to radiate heat for the battery box.
(b) When the battery box needs to be cooled by the battery radiator assembly and does not need to be cooled by the refrigeration circuit 4, the heat exchanger does not perform a heat exchange function: the battery water path water pump P2 → the battery water path flow sensor F2 → the battery radiator component → the heat exchanger (not playing the heat exchange role) → the reversing valve V3 → the battery water path temperature sensor T2 → the PTC heater → the battery box, thereby forming the complete energy transfer loop of the battery box, and only the battery radiator component is used for radiating heat for the battery box at the moment.
(c) When the battery box needs to be simultaneously cooled by the battery radiator assembly and the refrigeration circuit 4, the heat exchanger plays a role of heat exchange: the battery water path water pump P2 → the battery water path flow sensor F2 → the battery radiator assembly → the heat exchanger (for heat exchange) → the reversing valve V3 → the battery water path temperature sensor T2 → the PTC heater → the battery box, thus forming a complete energy transfer circuit of the battery box, and at this time, the battery radiator assembly and the refrigeration circuit 4 are used for heat dissipation of the battery box.
In the present invention, the motor water path 1 is further connected to the battery water path 2 via the ac water path 3.
The alternating-current water path 3 includes: the switch valve V1 is connected with the water outlet of the motor waterway 1; a speed control valve P3 connected to the on-off valve V1; a one-way stop valve V2 connected with the water return port of the motor water path 2; and an alternating-current waterway flow sensor F3 connected with the one-way stop valve V2. The function of the one-way stop valve V2 is to prevent the hot water in the motor water path from flowing into the battery water path when it is not necessary to heat the battery. The ac waterway flow sensor F3 is connected to the selector valve V3.
In the present invention, the rotation speed of the speed control valve P3 is controlled based on the temperature detection value of the battery water path temperature sensor T2. When the temperature detection value of the battery water path temperature sensor T2 is low (for example, lower than a preset low temperature threshold value), it is determined that heat needs to be supplied to the battery water path 2, and at this time, the rotation speed of the speed regulating valve P3 is increased, so that the heat of the motor water path 1 is transferred to the battery water path 2. When the temperature detection value of the battery water path temperature sensor T2 is high (for example, higher than a preset high temperature threshold value), it is determined that no heat needs to be supplied to the battery water path 2, and therefore the rotation speed of the speed regulating valve P3 may be reduced or stopped, so as to reduce or stop the heat transfer from the motor water path 1 to the battery water path 2.
When the battery pack needs to be heated, the battery radiator assembly and the heat exchanger are cut off by the reversing valve V3, the motor water path water pump P1 and the battery water path water pump P2 are both started, the switch valve V1 and the speed regulating valve P3 are started, and the water path running track of the thermal management system is as follows: the motor waterway water pump P1 → the motor waterway flow sensor F1 → the motor waterway temperature sensor T1 → the switch valve V1 → the speed control valve P3 → the battery waterway temperature sensor T2 → the PTC heater → the battery box → the battery waterway water pump P2 → the battery waterway flow sensor F2 → the change-over valve V3 → the alternating waterway flow sensor F3 → the one-way stop valve V2 → the motor radiator assembly → the motor waterway water pump P1, thereby constituting a complete circuit.
If the speed regulating pump P3 reaches the maximum rotating speed and still cannot meet the heating requirement of the battery box, the PTC heater of the battery water path 3 can be further started, so that the PTC heater further provides heat for the battery box.
Specifically, the method comprises the following steps: during the running of the vehicle, the motor is in working state and the motor waterway water pump P1 is continuously operated, so that the water temperature of the motor waterway 1 is rapidly increased and maintained at a high water temperature (for example, 70-90 ℃). If the battery pack needs to be heated at this time, the water pump P2 of the battery water path is started, the switch valve V1 and the speed regulating valve P3 are opened, and the rotating speed of the speed regulating pump P3 is controlled according to the temperature measured by the motor water path temperature sensor T1, so that the battery pack can meet the heating requirement of the battery box (for example, the water temperature reaches 30 ℃). If the speed regulating pump P3 reaches the maximum rotating speed and still cannot meet the heating requirement of the battery box, the PTC heater of the battery water path 3 is started, so that heat is further provided for the battery box.
Analyzing the system flow and pressure of the pipeline of the comprehensive heat management system when no expansion water tank exists by utilizing a bench test or simulation analysis, and determining the following three characteristic points on the main pipeline:
and (B) point A: the pressure of a motor waterway is high; and B, point: the motor waterway pressure is low; and C, point: the battery water way pressure is low. Wherein, the absolute pressure magnitude order of the three is: a > C > B. The purpose is as follows: if when the three are communicated together, the liquid in the pipeline can spontaneously flow from the point A and the point C to the point B, and the flow rate of the point A flowing to the point B is greater than the flow rate of the point C flowing to the point B. Then, a branch pipe is arranged at the point A and is connected with an exhaust pipe at the top of the expansion water tank; a branch pipe is arranged at the point B and is connected with a first return pipe at the bottom of the expansion water tank; and a branch pipe is arranged at the point C and is connected with a second water return pipe at the bottom of the expansion water tank. Structurally, the following requirements are ensured: the direction of the branch pipe at the point A is vertically upward; the branch pipe at the point B is as close as possible to the inlet of a certain water pump (such as P1) on the motor cooling pipeline; the direction of the branch pipe at the point C is vertically upward; the liquid level of the expansion tank is higher than the highest point of the pipeline.
The system flow and pressure of the pipeline of the comprehensive heat management system in the expansion water tank are confirmed by using a bench test, and the system pipeline can realize the following states:
(a) the liquid in the motor cooling pipeline continuously flows to the expansion water tank from the point A, and the flow is not more than one tenth of the flow of the main pipeline.
(b) The liquid in the expansion tank is continuously flowing to point B and the flow rate should be almost equal to the flow rate flowing to the expansion tank at point a.
(c) The pipe from the expansion tank to point C should be filled with coolant, and the flow rate during operation of the system should be almost zero except for the instantaneous flow rate from point C to the expansion tank at the initial stage of operation of the water pump in the system.
After the expansion water tank is connected according to the above mode:
(1) when the motor waterway 1 is disconnected with the alternating current waterway 2, and after the motor waterway water pump P1 is started, the waterway running track of the motor waterway 1 is as follows: the motor waterway water pump P1 → the electric motor → the motor waterway flow sensor F1 → the motor waterway temperature sensor T1 → the motor radiator assembly → the motor waterway water pump P1, thereby forming a complete energy transfer loop of the electric motor. Furthermore, at point a (where a three-way connection may be provided), a portion of the water passes through the exhaust pipe to the expansion tank and via the expansion tank and the first return pipe to point B (where a three-way connection may be provided). The expansion tank has the functions of storing liquid and exhausting air for the motor waterway 1.
(2) When the battery waterway 2 is disconnected from the alternating current waterway 3, after the battery waterway water pump P2 is opened, the waterway running track of the battery waterway 2 is divided into three situations:
(a) when the battery box does not need heat dissipation: the battery water path water pump P2 → the battery water path flow sensor F2 → the reversing valve V3 → the battery water path temperature sensor T2 → the PTC heater → the battery box, thereby forming a complete energy transfer loop of the battery box, and at the moment, the battery radiator assembly and the refrigeration loop 4 are not utilized to radiate heat for the battery box. Also, at point C (where a three-way connection may be provided), a portion of the water reaches the expansion tank via the second water return pipe, and reaches point B (where a three-way connection may be provided) via the expansion tank and the first water return pipe. The expansion tank has the functions of storing liquid and exhausting air for the battery water path 2.
(b) When the battery box needs to be cooled by the battery radiator assembly and does not need to be cooled by the refrigeration circuit 4, the heat exchanger does not perform a heat exchange function: the battery water path water pump P2 → the battery water path flow sensor F2 → the battery radiator component → the heat exchanger (not playing the heat exchange role) → the reversing valve V3 → the battery water path temperature sensor T2 → the PTC heater → the battery box, thereby forming the complete energy transfer loop of the battery box, and only the battery radiator component is used for radiating heat for the battery box at the moment. Also, at point C (where a three-way connection may be provided), a portion of the water reaches the expansion tank via the second water return pipe, and reaches point B (where a three-way connection may be provided) via the expansion tank and the first water return pipe. The expansion tank has the functions of storing liquid and exhausting air for the battery water path 2.
(c) When the battery box needs to be simultaneously cooled by the battery radiator assembly and the refrigeration circuit 4, the heat exchanger plays a role of heat exchange: the battery water path water pump P2 → the battery water path flow sensor F2 → the battery radiator assembly → the heat exchanger (for heat exchange) → the reversing valve V3 → the battery water path temperature sensor T2 → the PTC heater → the battery box, thus forming a complete energy transfer circuit of the battery box, and at this time, the battery radiator assembly and the refrigeration circuit 4 are used for heat dissipation of the battery box. Also, at point C (where a three-way connection may be provided), a portion of the water reaches the expansion tank via the second water return pipe, and reaches point B (where a three-way connection may be provided) via the expansion tank and the first water return pipe. The expansion tank has the functions of storing liquid and exhausting air for the battery water path 2.
Similarly, when the motor waterway 1 is connected with the ac waterway 2 and the battery waterway 2 is connected with the ac waterway 3, at point a (where a three-way connection may be provided), a portion of water reaches the expansion tank through the exhaust pipe and reaches point B (where a three-way connection may be provided) through the expansion tank and the first return pipe, and the expansion tank performs a liquid storage and exhaust function for the motor waterway 1. Furthermore, at point C (where a three-way connection may be provided), a part of the water reaches the expansion tank through the second water return pipe, and reaches point B (where a three-way connection may be provided) through the expansion tank and the first water return pipe, and the expansion tank also has a function of storing liquid and exhausting air for the battery water path 2.
The invention can be applied to new energy automobiles, such as pure electric automobiles, hybrid electric automobiles, fuel cell automobiles and the like.
In summary, the embodiment of the present invention includes: a motor waterway; a battery waterway; the water mixing branch pipe is positioned between the motor water channel and the battery water channel; the water return branch pipe is positioned between the motor waterway and the battery waterway; the expansion water tank comprises a first water return pipe, a second water return pipe and an exhaust pipe; wherein the exhaust pipe is connected to a motor water path, the first water return pipe is connected to the motor water path, and the second water return pipe is connected to the battery water path. In the embodiment of the invention, the shared expansion water tank is used for simultaneously providing the liquid storage and exhaust functions for the motor water path and the battery water path, so that the capacity and the weight of cooling liquid are reduced, the structure and the mounting bracket required for mounting the expansion water tank are saved, and the weight and the cost of the whole vehicle are also reduced.
In addition, in the embodiment of the invention, the high-temperature cooling liquid in the motor water path can spontaneously flow into the battery water path to heat the power battery, so that the motor waste heat recovery is realized. According to the embodiment of the invention, a water pump is not required to be adopted on the water mixing branch pipe to provide power for the high-temperature cooling liquid of the motor pipeline, so that the weight and the energy consumption of the system can be reduced.
In addition, the motor water path and the battery water path can be implemented in various forms, and the water path and the battery water path are suitable for various working requirement environments.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention and is not intended to limit the scope of the present invention, and equivalent embodiments or modifications such as combinations, divisions or repetitions of the features without departing from the technical spirit of the present invention are included in the scope of the present invention.

Claims (9)

1. The utility model provides an expansion tank shared system of new energy automobile which characterized in that includes:
a motor waterway;
a battery waterway;
the water mixing branch pipe is positioned between the motor waterway and the battery waterway and is used for introducing water in the motor waterway into the battery waterway;
the water return branch pipe is positioned between the motor waterway and the battery waterway and is used for guiding water in the battery waterway back to the motor waterway;
the expansion water tank comprises a first water return pipe, a second water return pipe and an exhaust pipe;
wherein the exhaust pipe is connected to a motor water path, the first water return pipe is connected to the motor water path, and the second water return pipe is connected to the battery water path;
the exhaust pipe is connected to a connection point of the water mixing branch pipe and the motor waterway;
the second water return pipe is connected to a connection point of the water mixing branch pipe and the battery waterway;
when the expansion water tank is detached, the water pressure at the connecting point of the exhaust pipe and the water path of the motor is higher than the water pressure at the connecting point of the second water return pipe and the water path of the battery, and the water pressure at the connecting point of the second water return pipe and the water path of the battery is higher than the water pressure at the connecting point of the first water return pipe and the water path of the motor.
2. The expansion tank sharing system of the new energy automobile as claimed in claim 1, wherein the branch pipe of the exhaust pipe is directed vertically upward, and the branch pipe of the second water return pipe is directed vertically upward.
3. The expansion tank sharing system of the new energy automobile according to claim 2,
the motor waterway comprises a motor waterway water pump;
and the branch pipe of the first water return pipe is close to the water pump inlet of the motor waterway.
4. The expansion tank sharing system of the new energy automobile according to claim 1, 2 or 3, further comprising:
the first valve is arranged on the water return branch pipe;
and the second valve is arranged on the water mixing branch pipe.
5. The expansion tank sharing system of the new energy automobile according to claim 1, 2 or 3,
the expansion water tank is a pressure type expansion water tank, a normal pressure type expansion water tank or an open type expansion water tank.
6. The expansion tank sharing system of the new energy automobile according to claim 1, 2 or 3, wherein the battery water path comprises: a battery water path temperature sensor; a positive temperature coefficient heater; a battery box; battery water route water pump.
7. The expansion tank sharing system of the new energy automobile according to claim 1, 2 or 3, wherein the motor water circuit comprises: a motor waterway pump; a motor; a motor heat sink assembly.
8. The expansion tank sharing system of the new energy automobile according to claim 4,
the first valve is an opening-controllable valve, and the second valve is an opening-controllable valve.
9. A new energy automobile, characterized by comprising the expansion tank sharing system of the new energy automobile according to claim 1.
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