CN117996284A - Thermal management system - Google Patents

Abstract

The invention provides a thermal management system, which comprises a cooling loop and a refrigerating loop, wherein the cooling loop comprises a multi-way valve, a first liquid pipeline, a second liquid pipeline and a third liquid pipeline which are connected with the multi-way valve, the multi-way valve is a six-way valve, a first heat exchanger is connected on the first liquid pipeline in series, a liquid cooling plate is connected on the second liquid pipeline in series, a liquid cooling energy storage converter is connected on the third pipeline in series, the cooling loop further comprises a PTC heater, the PTC heater is arranged on the first liquid pipeline or the second liquid pipeline, and the refrigerating loop is connected with the first heat exchanger in series. According to the invention, the liquid-cooled energy storage converter (PCS) cooling system is integrated with the battery thermal management system by adopting the six-way valve, a separate radiator of the liquid-cooled energy storage converter system is omitted, heat generated during the operation of the liquid-cooled energy storage converter system can be effectively recovered to heat the battery, and the energy utilization efficiency of the system is improved.

Description

Thermal management system

Technical Field

The invention relates to the technical field of thermal management, in particular to a thermal management system.

Background

The electrochemical energy storage system is one of important means for realizing peak clipping, valley filling, peak shaving and frequency modulation of the power grid and realizing renewable energy consumption. The battery thermal management system is an important component of the electrochemical energy storage system, and ensures that the battery energy storage system operates efficiently and stably in a proper temperature range. For large-scale battery energy storage systems, the energy conversion and utilization efficiency is a very important index, so the thermal management system should have a small energy consumption, and ensure the high energy conversion efficiency of the battery energy storage system.

For the traditional air-cooled battery thermal management system, the cooling efficiency is low, the temperature uniformity is poor, the cooling requirement under the condition of large charge and discharge multiplying power is difficult to meet, and the energy consumption is large; and when the battery needs to be heated, the battery is heated by utilizing electric heating, so that the energy utilization rate is low. The air-cooled battery thermal management system is difficult to meet the requirements of larger and larger energy storage scale, higher and higher energy conversion rate requirements and higher charge and discharge multiplying power.

The liquid cooling technology gradually replaces the air cooling technology to become a main scheme of the energy storage heat management system, along with the improvement of heat dissipation requirements, the heat management system consumes more and more energy, and the energy storage system has higher and higher energy conversion efficiency. Therefore, reducing the energy consumption of the thermal management system is one of the keys to improve the energy conversion efficiency of the energy storage system.

In addition, the PCS system is one of important parts of the energy storage system, and its thermal management is generally that a radiator and a radiating loop are separately equipped in the PCS at present, so that a great amount of heat is generated in the working process, and the heat is wasted and cannot be utilized under the low temperature condition. And PCS cooling is generally independent of battery thermal management cooling, and the whole thermal management system is low in integration level and efficiency.

Accordingly, there is a need to provide a thermal management system that overcomes the above-described drawbacks.

Disclosure of Invention

It is an object of the present invention to provide a thermal management system.

According to one aspect of the present invention, there is provided a thermal management system comprising:

a cooling circuit comprising a multi-way valve, a first liquid line, a second liquid line, and a third liquid line connected to the multi-way valve;

The first liquid pipeline is connected with a first heat exchanger in series, the second liquid pipeline is connected with a liquid cooling plate in series, the third pipeline is connected with a liquid cooling energy storage converter in series, the cooling loop further comprises a PTC heater, and the PTC heater is arranged on the first liquid pipeline or the second liquid pipeline;

and the refrigeration loop is connected with the first heat exchanger in series.

Preferably, the multi-way valve is a six-way valve and comprises a first valve port, a second valve port, a third valve port, a fourth valve port, a fifth valve port and a sixth valve port, wherein the first liquid pipeline is communicated with the first valve port and the sixth valve port, the second liquid pipeline is communicated with the second valve port and the third valve port, and the third liquid pipeline is communicated with the fourth valve port and the fifth valve port.

Preferably, the second liquid pipeline is further provided with a first coolant pump, and the second liquid pipeline is connected with the liquid cooling plate, the first coolant pump and the PTC heater in series from the liquid inlet end to the rear.

Preferably, the third liquid pipeline is provided with a second coolant pump, and the third liquid pipeline is connected with the second coolant pump and the liquid-cooled energy storage converter in series from the liquid inlet end to the rear.

Preferably, the refrigeration loop comprises a four-way valve connected with the first heat exchanger, a second heat exchanger connected with the four-way valve, a liquid storage tank connected with the second heat exchanger and an electronic expansion valve connected with the liquid storage tank and the first heat exchanger.

Preferably, a fluorine pump is connected in parallel between the liquid storage tank and the first heat exchanger, and a first electromagnetic valve is arranged between the fluorine pump and the first heat exchanger.

Preferably, the four-way valve comprises an A valve port, an B valve port, a C valve port and Ding Fakou, the four-way valve is further connected with a compressor, one end of the compressor is communicated with the A valve port, the other end of the compressor is communicated with Ding Fakou, the B valve port of the four-way valve is communicated with the first heat exchanger, and the C valve port of the four-way valve is communicated with the second heat exchanger.

Preferably, a gas-liquid separator is arranged between the compressor and Ding Fakou, and a second electromagnetic valve is arranged between the compressor and the valve port A.

Preferably, a third electromagnetic valve is connected in parallel between the A valve port and Ding Fakou of the four-way valve, one end of the third electromagnetic valve is connected to a pipeline between the A valve port and the second electromagnetic valve, and the other end of the third electromagnetic valve is connected to a pipeline between the T valve port and the gas-liquid separator.

Preferably, the multi-way valve comprises three communication modes:

Mode F1: the first valve port is communicated with the second valve port, the third valve port is communicated with the fourth valve port, and the fifth valve port is communicated with the sixth valve port;

mode F2: the first valve port is communicated with the second valve port, the third valve port is communicated with the sixth valve port, and the fourth valve port is communicated with the fifth valve port;

mode F3: the first valve port is communicated with the fourth valve port, the second valve port is communicated with the third valve port, and the fifth valve port is communicated with the sixth valve port.

According to another aspect of the present invention, there is provided a thermal management system comprising:

the refrigeration loop comprises a first heat exchanger, a four-way valve connected with the first heat exchanger, a compressor connected with the four-way valve, a second heat exchanger connected with the four-way valve, a liquid storage tank connected with the second heat exchanger and an electronic expansion valve connected with the liquid storage tank and the first heat exchanger;

and the cooling loop is connected with the first heat exchanger in series.

Preferably, a fluorine pump is connected in parallel between the liquid storage tank and the first heat exchanger, and a first electromagnetic valve is arranged between the fluorine pump and the first heat exchanger.

Preferably, the four-way valve comprises an A valve port, an B valve port, a C valve port and Ding Fakou, one end of the compressor is communicated with the A valve port, the other end of the compressor is communicated with the Ding Fakou, the B valve port of the four-way valve is communicated with the first heat exchanger, and the C valve port of the four-way valve is communicated with the second heat exchanger.

Preferably, a gas-liquid separator is arranged between the compressor and Ding Fakou, and a second electromagnetic valve is arranged between the compressor and the valve port A.

Preferably, a third electromagnetic valve is connected in parallel between the A valve port and Ding Fakou of the four-way valve, one end of the third electromagnetic valve is connected to a pipeline between the A valve port and the second electromagnetic valve, and the other end of the third electromagnetic valve is connected to a pipeline between the T valve port and the gas-liquid separator.

Preferably, the cooling circuit comprises a multi-way valve, a first liquid pipeline, a second liquid pipeline and a third liquid pipeline, wherein the first liquid pipeline, the second liquid pipeline and the third liquid pipeline are connected with the multi-way valve, the first liquid pipeline is connected with the first heat exchanger in series, the second liquid pipeline is connected with a liquid cooling plate in series, the third pipeline is connected with a liquid cooling energy storage converter in series, the cooling circuit further comprises a PTC heater, and the PTC heater is arranged on the first liquid pipeline or the second liquid pipeline.

Preferably, the multi-way valve is a six-way valve and comprises a first valve port, a second valve port, a third valve port, a fourth valve port, a fifth valve port and a sixth valve port, wherein the first liquid pipeline is communicated with the first valve port and the sixth valve port, the second liquid pipeline is communicated with the second valve port and the third valve port, and the third liquid pipeline is communicated with the fourth valve port and the fifth valve port.

Preferably, the second liquid pipeline is further provided with a first coolant pump, and the second liquid pipeline is connected with the liquid cooling plate, the first coolant pump and the PTC heater in series from the liquid inlet end to the rear.

Preferably, the third liquid pipeline is provided with a second coolant pump, and the third liquid pipeline is connected with the second coolant pump and the liquid-cooled energy storage converter in series from the liquid inlet end to the rear.

Compared with the prior art, the thermal management system provided by the invention has the following beneficial effects:

Due to the adoption of the technical scheme, the intelligent heat-storage battery management system has the advantages of simple structure, ingenious design and low cost, a six-way valve is adopted to integrate a liquid-cooling energy-storage converter (PCS) cooling system with a battery heat management system, a separate radiator of the liquid-cooling energy-storage converter system is omitted, heat generated during the working of the liquid-cooling energy-storage converter system can be effectively recovered to heat the battery, the energy utilization efficiency of the system is improved, meanwhile, the heat management system can be used for cooling the liquid-cooling energy-storage converter system, the integration level is improved, and the running cost and the number of parts of the heat management system are reduced.

Drawings

The invention is described in further detail below with reference to the attached drawings and detailed description:

FIG. 1 is a schematic diagram of a thermal management system according to the present invention;

FIG. 2 is a schematic diagram of a thermal management system according to the present invention in mode 1;

FIG. 3 is a schematic diagram of a thermal management system according to the present invention in mode 2;

FIG. 4 is a schematic diagram of a thermal management system according to the present invention in mode 3;

FIG. 5 is a schematic diagram of a thermal management system according to the present invention in mode 4;

FIG. 6 is a schematic diagram of a thermal management system according to the present invention in mode 5;

FIG. 7 is a schematic diagram of a thermal management system according to the present invention in mode 6;

FIG. 8 is a schematic diagram of a thermal management system according to the present invention in mode 7;

FIG. 9 is a schematic diagram of a thermal management system according to the present invention in mode 8;

FIG. 10 is a schematic diagram of a thermal management system according to the present invention in mode 9;

FIG. 11 is a schematic diagram of a thermal management system of the present invention in mode 10;

FIG. 12 is a schematic diagram of a thermal management system according to the present invention in mode 11;

FIG. 13 is a schematic diagram of a thermal management system of the present invention in mode 12;

fig. 14 is a schematic structural view of three communication modes of the multiway valve of the present invention.

The system comprises a first liquid pipeline, a first heat exchanger, a second liquid pipeline, a liquid cooling plate, a B2 first cooling liquid pump, a B3 PTC heater, a C third liquid pipeline, a C1 second cooling liquid pump, a C2. liquid cooling energy storage converter, a D1 multi-way valve, an a first valve port, a b second valve port, a c third valve port, a d fourth valve port, an e fifth valve port, a f sixth valve port, an E1 four-way valve, an a 'first valve port, a b' second valve port, a c 'third valve port, a d' Ding Fakou, an E2 second heat exchanger, a E3. liquid storage tank, a E4. electronic expansion valve, a E5. compressor, a E6. fluorine pump, a E7. first electromagnetic valve, a E8. gas-liquid separator, a E9. second electromagnetic valve, an E10 third electromagnetic valve and an E11 fan.

Detailed Description

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

For the sake of simplicity of the drawing, the parts relevant to the present invention are shown only schematically in the figures, which do not represent the actual structure thereof as a product. Additionally, in order to simplify the drawing for ease of understanding, components having the same structure or function in some of the drawings are shown schematically with only one of them, or only one of them is labeled. Herein, "a" means not only "only this one" but also "more than one" case.

It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

In this context, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In addition, in the description of the present application, the terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will explain the specific embodiments of the present invention with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the invention, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.

Referring to fig. 1 and 14, a thermal management system is disclosed that includes a cooling circuit and a refrigeration circuit. The cooling circuit is provided with cooling liquid and the refrigerating circuit is provided with refrigerant. Both the cooling circuit and the refrigerating circuit are connected in series with the first heat exchanger A1 at the same time, and the refrigerating circuit absorbs heat of the cooling circuit through the first heat exchanger A1 or transfers heat to the cooling circuit.

The cooling circuit includes a multi-way valve D1, a first liquid line a, a second liquid line B, and a third liquid line C connected to the multi-way valve D1. The multi-way valve D1 is a six-way valve and comprises a first valve port a, a second valve port b, a third valve port c, a fourth valve port D, a fifth valve port e and a sixth valve port f. The multi-way valve D1 includes three communication modes as follows:

Mode F1: the first valve port a is communicated with the second valve port b, the third valve port c is communicated with the fourth valve port d, and the fifth valve port e is communicated with the sixth valve port f;

Mode F2: the first valve port a is communicated with the second valve port b, the third valve port c is communicated with the sixth valve port f, and the fourth valve port d is communicated with the fifth valve port e;

mode F3: the first valve port a is communicated with the fourth valve port d, the second valve port b is communicated with the third valve port c, and the fifth valve port e is communicated with the sixth valve port f.

The liquid inlet end of the first liquid pipeline A is connected with the sixth valve port f, and the liquid outlet end is connected with the first valve port a; the liquid inlet end of the second liquid pipeline B is connected with the second valve port B, and the liquid outlet end is connected with the third valve port c; the liquid inlet end of the third liquid pipeline C is connected with the fourth valve port d, and the liquid outlet end is connected with the fifth valve port e.

The first liquid pipeline A is connected with a first heat exchanger A1 in series. The second liquid pipeline B is sequentially connected with a liquid cooling plate B1, a first cooling liquid pump B2 and a PTC heater B3 in series from a liquid inlet end to the rear. In other embodiments, PTC heater B3 may also be connected in series on the first pipe. The third liquid pipeline C is sequentially connected with a second coolant pump C1 and a liquid cooling energy storage converter C2 (also called PCS) in series from a liquid inlet end to the rear.

The first heat exchanger A1 is also connected in series on a refrigeration loop, and the refrigeration loop comprises a four-way valve E1 connected with the first heat exchanger A1, a second heat exchanger E2 connected with the four-way valve E1, a liquid storage tank E3 connected with the second heat exchanger E2 and an electronic expansion valve E4 connected with the liquid storage tank E3 and the first heat exchanger A1. The second heat exchanger can be used as an evaporator or a condenser for heating up and cooling down. One side of the heat exchanger is provided with a fan E11 for heat dissipation, and the fan E11 is arranged opposite to the second heat exchanger E2. Four-way valve E1 includes a first port a ', a second port b', a third port c 'and Ding Fakou d'. The communication mode of the four-way valve E1 is as follows:

mode G1: the first valve port a 'is communicated with the third valve port c', and the second valve port b 'is communicated with Ding Fakou d';

mode G2: the first valve port a 'is communicated with the second valve port b', and the third valve port c 'is communicated with Ding Fakou d'.

The four-way valve E1 is also connected with a compressor E5, one end of the compressor E5 is communicated with an A valve port a 'of the four-way valve E1, and the other end of the compressor E5 is communicated with Ding Fakou d' of the four-way valve E1. The second port b 'of the four-way valve E1 is communicated with the first heat exchanger A1, and the third port c' of the four-way valve E1 is communicated with the second heat exchanger E2.

A fluorine pump E6 is connected in parallel between the liquid storage tank E3 and the first heat exchanger A1, and a first electromagnetic valve E7 is arranged between the fluorine pump E6 and the first heat exchanger A1. When the external environment temperature of the energy storage heat management system is low, the fluorine pump E6 is started to replace the compressor E5 for refrigeration, so that the energy consumption of the heat management system is remarkably reduced. A gas-liquid separator E8 is arranged between the compressor E5 and Ding Fakou d 'of the four-way valve E1, and a second electromagnetic valve E9 is arranged between the compressor E5 and a valve port a' of the four-way valve E1. A third electromagnetic valve E10 is connected in parallel between the A valve port a 'of the four-way valve E1 and Ding Fakou d' of the four-way valve E1. One end of the third electromagnetic valve E10 is connected to a pipeline between an A valve port a 'of the four-way valve E1 and the second electromagnetic valve E9, and the other end of the third electromagnetic valve E10 is connected to a pipeline between Ding Fakou d' of the four-way valve E1 and the gas-liquid separator E8.

The embodiment provides an integrated heat management system, which is integrated with a liquid cooling energy storage converter C2 (PCS) cooling system which is another key component of an energy storage system by using a cooling liquid multi-way valve D1, and has the functions of refrigerating and radiating a compressor E5, evaporating and radiating a fluorine pump E6, self-circulating and homogenizing temperature, heating a heat pump, PTC electric heating, recovering PCS waste heat and the like.

In addition, when the external environment temperature is lower and the PCS and the battery need to be cooled, the fluorine pump E6 can be started to replace the compressor E5 for refrigeration, and the low energy consumption characteristic of the fluorine pump E6 system is that the PCS and the battery are cooled. The compressor E5 can be utilized to switch to a heat pump operation mode, the heat pump system is operated as a battery for heating, and the energy consumption of the heat management system can be further reduced due to the high energy efficiency characteristic of the heat pump. The heat exchange component only needs two heat exchangers, so that the system integration level is greatly improved, and the system complexity is reduced while the energy efficiency of the thermal management system is improved.

The thermal management system of this embodiment has 13 modes of operation, and the specific operation process is as follows:

Referring to fig. 2, mode 1: when the external environment temperature is higher or the battery temperature exceeds a limit value due to charge and discharge, heat dissipation is needed, but the internal temperature of the liquid cooling energy storage converter C2 is suitable for temporarily not needing heat dissipation, the main element states are as follows: the compressor E5 is opened, the second electromagnetic valve E9 is opened, the third electromagnetic valve E10 is closed, the fan E11 is opened, the electronic expansion valve E4 is opened, the fluorine pump E6 is closed, the first electromagnetic valve E7 is closed, at the moment, the state of the four-way valve E1 is a mode G1, the mode of the multi-way valve D1 is a mode F2, the first cooling liquid pump B2 is opened, and the second cooling liquid pump C1 is closed.

At this time, the refrigerant is compressed by the compressor E5, the high-temperature and high-pressure gas is condensed into high-temperature and high-pressure liquid by the second heat exchanger E2 (condenser), the high-temperature and high-pressure liquid is throttled into a low-temperature and low-pressure gas-liquid two-phase state by the liquid storage tank E3 by the electronic expansion valve E4, the heat from the cooling liquid is absorbed by the first heat exchanger A1, and the high-temperature and high-pressure gas returns to the inlet of the compressor E5 by the four-way valve E1 and the gas-liquid separator E8 to continue circulation; the cooling liquid in the first heat exchanger A1 releases heat to low-temperature liquid, then flows through the liquid cooling plate B1, takes away heat of the battery to form high-temperature liquid, returns to the first heat exchanger A1 through the multi-way valve D1 after passing through the first cooling liquid pump B2, continuously releases heat, and circularly reciprocates.

Referring to fig. 3, mode 2: when the temperature of the external environment is higher, the temperature of the battery exceeds a limit value, and heat dissipation is required; meanwhile, when the temperature of the liquid cooling energy storage converter C2 exceeds the limit and heat dissipation is needed, the heat load is born by the refrigerating system of the compressor E5.

The main element states at this time are: the compressor E5 is opened, the second electromagnetic valve E9 is opened, the first electromagnetic valve E7 is closed, the fan E11 is opened, the electronic expansion valve E4 is opened, the fluorine pump E6 is closed, the third electromagnetic valve E10 is closed, the four-way valve E1 is in a mode G1, the multi-way valve D1 is in a mode F1, the first coolant pump B2 is opened, and the second coolant pump C1 is opened.

At this time, the refrigerant is compressed by the compressor E5, the high-temperature and high-pressure gas is condensed into high-temperature and high-pressure liquid by the second heat exchanger E2 (condenser), the high-temperature and high-pressure liquid is throttled into a low-temperature and low-pressure two-phase state by the electronic expansion valve E4 through the liquid storage tank E3, the heat from the cooling liquid is absorbed in the first heat exchanger A1, and the high-temperature and high-pressure gas returns to the inlet of the compressor E5 through the four-way valve E1 and the gas-liquid separator E8 to continue circulation; the cooling liquid in the first heat exchanger A1 releases heat to low-temperature liquid, then flows through the liquid cooling plate B1, takes away heat of the battery to form high-temperature liquid, flows through the liquid cooling energy storage converter C2 through the multi-way valve D1 and the second cooling liquid pump C1 after passing through the first cooling liquid pump B2, takes away heat of the liquid cooling energy storage converter C2 to form high-temperature liquid, returns to the first heat exchanger A1 through the multi-way valve D1 to continuously release heat, and circulates and reciprocates.

Referring to fig. 4, mode 3: when the battery does not need to dissipate heat and does not need to be heated but has the temperature equalization requirement, and the liquid cooling energy storage converter C2 needs to dissipate heat, the main element states are as follows: the compressor E5 is opened, the second electromagnetic valve E9 is opened, the third electromagnetic valve E10 is closed, the fan E11 is opened, the electronic expansion valve E4 is opened, the fluorine pump E6 is closed, the first electromagnetic valve E7 is closed, and the state of the four-way valve E1 is the mode G1; at this time, the mode of the multi-way valve D1 is the mode F3, the first coolant pump B2 is turned on, and the second coolant pump C1 is turned on.

At this time, the refrigerant is compressed by the compressor E5, the high-temperature and high-pressure gas is condensed into high-temperature and high-pressure liquid by the second heat exchanger E2 (condenser), the high-temperature and high-pressure liquid is throttled into a low-temperature and low-pressure two-phase state by the electronic expansion valve E4 through the liquid storage tank E3, the heat from the cooling liquid is absorbed in the first heat exchanger A1, and the high-temperature and high-pressure gas returns to the inlet of the compressor E5 through the four-way valve E1 and the gas-liquid separator E8 to continue circulation; after the cooling liquid in the first heat exchanger A1 releases heat to low-temperature liquid, the low-temperature liquid flows through the liquid cooling energy storage converter C2 through the multi-way valve D1 and the second cooling liquid pump C1, the heat of the liquid cooling energy storage converter C2 is taken away to form high-temperature liquid, the high-temperature liquid returns to the first heat exchanger A1 through the multi-way valve D1 to continuously release heat, the cooling liquid in the second liquid pipeline B circularly reciprocates, and the cooling liquid returns to the liquid cooling plate B1 through the first cooling liquid pump B2 and the multi-way valve D1 after flowing through the liquid cooling plate B1.

Referring to fig. 5, mode 4: when the battery does not need to dissipate heat, does not need to be heated and does not have the uniform temperature requirement, and the liquid cooling energy storage converter C2 needs to dissipate heat, the main element states are as follows: the compressor E5 is opened, the second electromagnetic valve E9 is opened, the third electromagnetic valve E10 is closed, the fan E11 is opened, the electronic expansion valve E4 is opened, the fluorine pump E6 is closed, the first electromagnetic valve E7 is closed, and the state of the four-way valve E1 is the mode G1; at this time, the mode of the multi-way valve D1 is the mode F3, the first coolant pump B2 is turned off, and the second coolant pump C1 is turned on.

At this time, the refrigerant is compressed by the compressor E5, the high-temperature and high-pressure gas is condensed into high-temperature and high-pressure liquid by the second heat exchanger E2 (condenser), the high-temperature and high-pressure liquid is throttled into a low-temperature and low-pressure two-phase state by the electronic expansion valve E4 through the liquid storage tank E3, the heat from the cooling liquid is absorbed in the first heat exchanger A1, and the high-temperature and high-pressure gas returns to the inlet of the compressor E5 through the four-way valve E1 and the gas-liquid separator E8 to continue circulation; after the cooling liquid in the first heat exchanger A1 releases heat to low-temperature liquid, the low-temperature liquid flows through the liquid-cooled energy storage converter C2 through the multi-way valve D1 and the second cooling liquid pump C1, takes away the heat of the liquid-cooled energy storage converter C2 to form high-temperature liquid, returns to the first heat exchanger A1 through the multi-way valve D1 to continuously release heat, and circulates and reciprocates.

Referring to fig. 6, mode 5: when the battery needs to be heated and the liquid cooling energy storage converter C2 does not work or has low work load and no available waste heat, the main element states are as follows: the compressor E5 is opened, the second electromagnetic valve E9 is opened, the third electromagnetic valve E10 is closed, the fan E11 is opened, the electronic expansion valve E4 is opened, the fluorine pump E6 is closed, the first electromagnetic valve E7 is closed, and the state of the four-way valve E1 is the mode G2; at this time, the mode of the multi-way valve D1 is the mode F2, the first coolant pump B2 is turned on, and the second coolant pump C1 is turned off.

At this time, the refrigerant is compressed by the compressor E5, the high-temperature high-pressure gas passes through the four-way valve E1 to the first heat exchanger A1, heat is released to the cooling liquid, the cooling liquid is throttled into a low-temperature low-pressure two-phase state by the electronic expansion valve E4, the cooling liquid is evaporated into low-temperature low-pressure gas by the liquid storage tank E3 to the second heat exchanger E2 (evaporator), external heat is absorbed, and the cooling liquid returns to the inlet of the compressor E5 through the four-way valve E1 and the gas-liquid separator E8 to continue circulating; the cooling liquid in the first heat exchanger A1 absorbs heat to form high-temperature liquid, the high-temperature liquid flows through the liquid cooling plate B1, the low-temperature liquid is formed after releasing heat to the battery, and the low-temperature liquid returns to the first heat exchanger A1 through the multi-way valve D1 to continuously absorb heat after passing through the first cooling liquid pump B2 and circularly reciprocates.

Referring to fig. 7, mode 6: when the battery needs to be heated and the liquid cooling energy storage converter C2 does not work or has low work load and no available waste heat, the mode 5 is utilized to heat the battery, and the requirements cannot be met, and the PTC heater B3 is started.

The main element states at this time are: the compressor E5 is opened, the second electromagnetic valve E9 is opened, the third electromagnetic valve E10 is closed, the fan E11 is opened, the electronic expansion valve E4 is opened, the fluorine pump E6 is closed, the first electromagnetic valve E7 is closed, and the state of the four-way valve E1 is in a mode G2; at this time, the mode of the multi-way valve D1 is the mode F2, the first coolant pump B2 is turned on, the second coolant pump C1 is turned off, and the PTC heater B3 is turned on.

At this time, the refrigerant is compressed by the compressor E5, the high-temperature and high-pressure gas passes through the four-way valve E1 to the first heat exchanger A1, releases heat to the cooling liquid, throttles into a low-temperature and low-pressure two-phase state by the electronic expansion valve E4, is evaporated into low-temperature and low-pressure gas by the liquid storage tank E3 to the second heat exchanger E2 (evaporator), and returns to the inlet of the compressor E5 by the four-way valve E1 and the gas-liquid separator E8 to continue circulation; the cooling liquid in the first heat exchanger A1 absorbs heat to form high-temperature liquid, then flows through the liquid cooling plate B1, releases heat to the battery to form low-temperature liquid, and flows through the first cooling liquid pump B2, then flows to the PTC heater B3 to be heated to form high-temperature liquid, and returns to the first heat exchanger A1 through the multi-way valve D1 to continuously absorb heat, and then circularly reciprocates.

Referring to fig. 8, mode 7: when the battery needs to be heated and the liquid cooling energy storage converter C2 has higher work load and available waste heat, and the heat of the liquid cooling energy storage converter C2 is recovered, the main element states are as follows: the compressor E5 is closed, the second electromagnetic valve E9 is closed, the third electromagnetic valve E10 is closed, the fan E11 is closed, the electronic expansion valve E4 is closed, the fluorine pump E6 is closed, and the first electromagnetic valve E7 is closed; at this time, the mode of the multi-way valve D1 is the mode F1, the first coolant pump B2 is turned on, and the second coolant pump C1 is turned on.

At this time, after the cooling liquid absorbs heat to form high-temperature liquid in the liquid cooling energy storage converter C2 system, the high-temperature liquid passes through the multi-way valve D1 to the first heat exchanger A1, flows through the liquid cooling plate B1 to release heat to the battery to form low-temperature liquid, and after passing through the first cooling liquid pump B2, the low-temperature liquid returns to the liquid cooling energy storage converter C2 through the multi-way valve D1 and the second cooling liquid pump C1 to continuously absorb heat, and the circulation is performed.

Referring to fig. 9, mode 8: when the battery needs to be heated and the liquid cooling energy storage converter C2 has higher work load and available waste heat, the heat pump system in the utilization mode 5 heats the battery and recovers the heat of the cold energy storage converter, and the main element states are as follows: the compressor E5 is opened, the second electromagnetic valve E9 is opened, the third electromagnetic valve E10 is closed, the fan E11 is opened, the electronic expansion valve E4 is opened, the fluorine pump E6 is closed, the first electromagnetic valve E7 is closed, and the state of the four-way valve E1 is the mode G2; at this time, the mode of the multi-way valve D1 is the mode F1, the first coolant pump B2 is turned on, and the second coolant pump C1 is turned on.

At this time, the refrigerant is compressed by the compressor E5, the high-temperature and high-pressure gas passes through the four-way valve E1 to the first heat exchanger A1, heat is released to the cooling liquid, the cooling liquid is throttled into a low-temperature and low-pressure two-phase state by the electronic expansion valve E4, the cooling liquid is evaporated into low-temperature and low-pressure gas by the liquid storage tank E3 to the second heat exchanger E2 (evaporator), and the low-temperature and low-pressure gas returns to the inlet of the compressor E5 by the four-way valve E1 and the gas-liquid separator E8 to continue circulation; after the cooling liquid in the first heat exchanger A1 absorbs heat to form high-temperature liquid, the high-temperature liquid flows through the liquid cooling plate B1, the low-temperature liquid is formed after the heat is released to the battery, the low-temperature liquid returns to the liquid cooling energy storage converter C2 through the multi-way valve D1 and the second cooling liquid pump C1 after passing through the first cooling liquid pump B2, the high-temperature liquid returns to the first heat exchanger A1 through the multi-way valve D1 to absorb heat continuously, and the low-temperature liquid is circulated and reciprocated.

Referring to fig. 10, mode 9: when the battery needs to be heated and the liquid cooling energy storage converter C2 has higher work load and can utilize waste heat, the heat pump system in the utilization mode 5 heats the battery and recovers the heat of the cold energy storage converter, but the total heat can not meet the heating requirement of the battery, and the PTC heater B3 is started.

The main element states at this time are: the compressor E5 is opened, the second electromagnetic valve E9 is opened, the third electromagnetic valve E10 is closed, the fan E11 is opened, the electronic expansion valve E4 is opened, the fluorine pump E6 is closed, the first electromagnetic valve E7 is closed, and the state of the four-way valve E1 is the mode G2; at this time, the mode of the multi-way valve D1 is the mode F1, the first coolant pump B2 is turned on, the second coolant pump C1 is turned on, and the PTC heater B3 is turned on.

At this time, the refrigerant is compressed by the compressor E5, the high-temperature and high-pressure gas passes through the four-way valve E1 to the first heat exchanger A1, heat is released to the cooling liquid, the cooling liquid is throttled into a low-temperature and low-pressure two-phase state by the electronic expansion valve E4, the cooling liquid is evaporated into low-temperature and low-pressure gas by the liquid storage tank E3 to the second heat exchanger E2 (evaporator), and the low-temperature and low-pressure gas returns to the inlet of the compressor E5 by the four-way valve E1 and the gas-liquid separator E8 to continue circulation; the cooling liquid in the first heat exchanger A1 absorbs heat to form high-temperature liquid, then flows through the liquid cooling plate B1, releases heat to the battery to form low-temperature liquid, and after passing through the first cooling liquid pump B2, the low-temperature liquid is heated to the PTC heater B3 to form high-temperature liquid, and returns to the liquid cooling energy storage converter C2 to absorb heat through the multi-way valve D1 and the second cooling liquid pump C1, and returns to the first heat exchanger A1 to continuously absorb heat through the multi-way valve D1, and the circulation is repeated.

Referring to fig. 11, mode 10: when the environment temperature is lower but the battery needs to be cooled, the work load of the liquid cooling energy storage converter C2 system is lower and the battery does not need to be cooled, and the fluorine pump E6 and the first heat exchanger A1 are utilized to dissipate heat of the battery, the main element states are that the compressor E5 is closed, the second electromagnetic valve E9 is closed, the third electromagnetic valve E10 is opened, the fan E11 is opened, the electronic expansion valve E4 is closed, the fluorine pump E6 is opened, the first electromagnetic valve E7 is opened, and the four-way valve E1 is in a mode G2; at this time, the mode of the multi-way valve D1 is the mode F2, the first coolant pump B2 is turned on, and the second coolant pump C1 is turned off.

At this time, the refrigerant liquid is evaporated into gas in the first heat exchanger A1, absorbs heat, is condensed into liquid through the four-way valve E1 to the second heat exchanger E2 (condenser), releases heat, and returns to the fluorine pump E6 through the liquid storage tank E3 for continuous circulation; the cooling liquid in the first heat exchanger A1 releases heat to low-temperature liquid, then flows through the liquid cooling plate B1, takes away heat of the battery to form high-temperature liquid, returns to the first heat exchanger A1 through the multi-way valve D1 after passing through the first cooling liquid pump B2, continuously releases heat, and circularly reciprocates.

Referring to fig. 12, mode 11: when the environment temperature is lower and the battery needs to be cooled, the liquid-cooled energy-storage converter C2 system also needs to dissipate heat, and the fluorine pump E6 and the first heat exchanger A1 are utilized to dissipate heat for the battery and the liquid-cooled energy-storage converter C2, the main element states are that the compressor E5 is closed, the second electromagnetic valve E9 is closed, the third electromagnetic valve E10 is opened, the fan E11 is opened, the electronic expansion valve E4 is closed, the fluorine pump E6 is opened, the first electromagnetic valve E7 is opened, and the four-way valve E1 is in a mode G2; at this time, the mode of the multi-way valve D1 is the mode F1, the first coolant pump B2 is turned on, and the second coolant pump C1 is turned on.

At this time, the refrigerant liquid is evaporated into gas in the first heat exchanger A1, absorbs heat, is condensed into liquid through the four-way valve E1 to the second heat exchanger E2 (condenser), releases heat, and returns to the fluorine pump E6 through the liquid storage tank E3 for continuous circulation; the cooling liquid in the first heat exchanger A1 releases heat to low-temperature liquid, then flows through the liquid cooling plate B1, takes away heat of the battery to form high-temperature liquid, flows through the liquid cooling energy storage converter C2 through the multi-way valve D1 and the second cooling liquid pump C1 after passing through the first cooling liquid pump B2, takes away heat of the liquid cooling energy storage converter C2 to form high-temperature liquid, returns to the first heat exchanger A1 through the multi-way valve D1 to continuously release heat, and circulates and reciprocates.

Referring to fig. 13, mode 12: when the ambient temperature is lower, but the battery needs to be cooled, the liquid cooling energy storage converter C2 system also needs to be cooled, the heat dissipation requirement of the battery cannot be met by the fluorine pump E6 and the first heat exchanger A1, the compressor E5 is started for refrigeration, and when the fluorine pump E6 is closed, the main element states are as follows: the compressor E5 is opened, the second electromagnetic valve E9 is opened, the third electromagnetic valve E10 is closed, the fan E11 is opened, the electronic expansion valve E4 is opened, the fluorine pump E6 is closed, the first electromagnetic valve E7 is closed, and the state of the four-way valve E1 is the mode G1; at this time, the mode of the multi-way valve D1 is the mode F1, the first coolant pump B2 is turned on, and the second coolant pump C1 is turned on.

At this time, the refrigerant is compressed by the compressor E5, the high-temperature and high-pressure gas is condensed into high-temperature and high-pressure liquid by the second heat exchanger E2 (condenser), the high-temperature and high-pressure liquid is throttled into a low-temperature and low-pressure two-phase state by the electronic expansion valve E4 through the liquid storage tank E3, the heat from the cooling liquid is absorbed in the first heat exchanger A1, and the high-temperature and high-pressure gas returns to the inlet of the compressor E5 through the four-way valve E1 and the gas-liquid separator E8 to continue circulation; the cooling liquid in the first heat exchanger A1 releases heat to low-temperature liquid, then flows through the liquid cooling plate B1, takes away heat of the battery to form high-temperature liquid, flows through the liquid cooling energy storage converter C2 through the multi-way valve D1 and the second cooling liquid pump C1 after passing through the first cooling liquid pump B2, takes away heat of the liquid cooling energy storage converter C2 system to form high-temperature liquid, returns to the first heat exchanger A1 through the multi-way valve D1 to continuously release heat, and circularly reciprocates.

Mode 13: when the battery does not need to dissipate heat, does not need to be heated and does not need to be subjected to uniform temperature, the liquid cooling energy storage converter C2 does not need to dissipate heat, and the thermal management system is in a standby state.

The on state of each component in each mode is summarized as follows:

Component/mode

C1

D1

B3

B2

E5

E9

E10

E1

E11

E4

E6

E7

Mode 1

off

F2

off

on

on

on

off

a-c-d-b

on

on

off

off

Mode 2

on

F1

off

on

on

on

off

a-c，d-b

on

on

off

off

Mode 3

on

F3

off

on

on

on

off

a-c，d-b

on

on

off

off

Mode 4

on

F3

off

off

on

on

off

a-c，d-b

on

on

off

off

Mode 5

off

F2

off

on

on

on

off

a-b，c-d

on

on

off

off

Mode 6

off

F2

on

on

on

on

off

a-b，c-d

on

on

off

off

Mode 7

on

F1

off

on

off

off

off

/

off

off

off

off

Mode 8

on

F1

off

on

on

on

off

a-b，c-d

on

on

off

off

Mode 9

on

F1

on

on

on

on

off

a-b，c-d

on

on

off

off

Mode 10

off

F2

off

on

off

off

on

a-b，c-d

on

off

on

on

Mode 11

on

F1

off

on

off

off

on

a-b，c-d

on

off

on

on

Mode 12

on

F1

off

on

on

on

off

a-c，d-b

on

on

off

off

Mode 13

off

off

off

off

off

off

off

/

off

off

off

off

On: on, off-off.

It will be apparent to those skilled in the art that various modifications and variations can be made to the above-described exemplary embodiments of the present invention without departing from the spirit and scope of the invention. Therefore, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims (19)

1. A thermal management system, comprising:

a cooling circuit comprising a multi-way valve, a first liquid line, a second liquid line, and a third liquid line connected to the multi-way valve;

The first liquid pipeline is connected with a first heat exchanger in series, the second liquid pipeline is connected with a liquid cooling plate in series, the third pipeline is connected with a liquid cooling energy storage converter in series, the cooling loop further comprises a PTC heater, and the PTC heater is arranged on the first liquid pipeline or the second liquid pipeline;

and the refrigeration loop is connected with the first heat exchanger in series.

2. The thermal management system of claim 1, wherein the multi-way valve is a six-way valve comprising a first valve port, a second valve port, a third valve port, a fourth valve port, a fifth valve port, and a sixth valve port, the first liquid line in communication with the first valve port and the sixth valve port, the second liquid line in communication with the second valve port and the third valve port, and the third liquid line in communication with the fourth valve port and the fifth valve port.

3. The thermal management system of claim 2, wherein the second liquid pipeline is further provided with a first coolant pump, and the liquid cooling plate, the first coolant pump and the PTC heater are sequentially connected in series from the liquid inlet end to the rear.

4. The thermal management system of claim 3, wherein a second coolant pump is disposed on the third liquid pipeline, and the second coolant pump and the liquid-cooled energy storage converter are sequentially connected in series from a liquid inlet end to a rear.

5. The thermal management system of claim 1, wherein the refrigeration circuit comprises a four-way valve coupled to the first heat exchanger, a second heat exchanger coupled to the four-way valve, a liquid storage tank coupled to the second heat exchanger, and an electronic expansion valve coupled to the liquid storage tank and the first heat exchanger.

6. The thermal management system of claim 5, wherein a fluorine pump is connected in parallel between the liquid storage tank and the first heat exchanger, and a first solenoid valve is disposed between the fluorine pump and the first heat exchanger.

7. The thermal management system of claim 6, wherein the four-way valve comprises an a port, an b port, a c port, and Ding Fakou, the four-way valve further being connected to a compressor, one end of the compressor being in communication with the a port, the other end of the compressor being in communication with the Ding Fakou, the b port of the four-way valve being in communication with the first heat exchanger, the c port of the four-way valve being in communication with the second heat exchanger.

8. The thermal management system of claim 7, wherein a gas-liquid separator is disposed between the compressor and Ding Fakou, and a second solenoid valve is disposed between the compressor and the alpha valve port.

9. The thermal management system of claim 8, wherein a third solenoid valve is connected in parallel between the port a and Ding Fakou of the four-way valve, one end of the third solenoid valve is connected to a line between the port a and the second solenoid valve, and the other end of the third solenoid valve is connected to a line between the port d and the gas-liquid separator.

10. The thermal management system of claim 4, wherein the multi-way valve comprises three communication modes:

Mode F1: the first valve port is communicated with the second valve port, the third valve port is communicated with the fourth valve port, and the fifth valve port is communicated with the sixth valve port;

mode F2: the first valve port is communicated with the second valve port, the third valve port is communicated with the sixth valve port, and the fourth valve port is communicated with the fifth valve port;

mode F3: the first valve port is communicated with the fourth valve port, the second valve port is communicated with the third valve port, and the fifth valve port is communicated with the sixth valve port.

11. A thermal management system, comprising:

the refrigeration loop comprises a first heat exchanger, a four-way valve connected with the first heat exchanger, a compressor connected with the four-way valve, a second heat exchanger connected with the four-way valve, a liquid storage tank connected with the second heat exchanger and an electronic expansion valve connected with the liquid storage tank and the first heat exchanger;

and the cooling loop is connected with the first heat exchanger in series.

12. The thermal management system of claim 11, wherein a fluorine pump is connected in parallel between the liquid storage tank and the first heat exchanger, and a first solenoid valve is disposed between the fluorine pump and the first heat exchanger.

13. The thermal management system of claim 12, wherein the four-way valve comprises an a port, an b port, a c port, and Ding Fakou, wherein one end of the compressor is in communication with the a port, the other end of the compressor is in communication with the Ding Fakou, wherein the b port of the four-way valve is in communication with the first heat exchanger, and wherein the c port of the four-way valve is in communication with the second heat exchanger.

14. The thermal management system of claim 13, wherein a gas-liquid separator is disposed between the compressor and Ding Fakou, and a second solenoid valve is disposed between the compressor and the alpha valve port.

15. The thermal management system of claim 14, wherein a third solenoid valve is connected in parallel between the port a and Ding Fakou of the four-way valve, one end of the third solenoid valve being connected to the line between the port a and the second solenoid valve, and the other end of the third solenoid valve being connected to the line between the port d and the gas-liquid separator.

16. The thermal management system of claim 15, wherein the cooling circuit comprises a multi-way valve and first, second and third liquid lines connected to the multi-way valve, the first liquid line being in series with the first heat exchanger, the second liquid line being in series with a liquid cooling plate, the third line being in series with a liquid cooling energy storage converter, the cooling circuit further comprising a PTC heater disposed on either the first or second liquid line.

17. The thermal management system of claim 16, wherein the multi-way valve is a six-way valve comprising a first valve port, a second valve port, a third valve port, a fourth valve port, a fifth valve port, and a sixth valve port, the first liquid line in communication with the first valve port and the sixth valve port, the second liquid line in communication with the second valve port and the third valve port, and the third liquid line in communication with the fourth valve port and the fifth valve port.

18. The thermal management system of claim 17, wherein the second liquid line is further provided with a first coolant pump, and the second liquid line is sequentially connected in series with the liquid cooling plate, the first coolant pump and the PTC heater from a liquid inlet end to a rear.

19. The thermal management system of claim 18, wherein a second coolant pump is disposed on the third liquid pipeline, and the second coolant pump and the liquid-cooled energy storage converter are sequentially connected in series from a liquid inlet end to a liquid outlet end.