Cascade type direct-cooling and direct-heating energy storage battery heat management system

Abstract

The utility model discloses a heat management system of an overlapped direct-cooling and direct-heating energy storage battery. The heat management system comprises a plurality of battery cold plates, a heat exchanger, a first system and a second system, the first end of the battery cold plate is connected with first electromagnetic valves and second electromagnetic valves, the plurality of first electromagnetic valves are connected to form a first node, and the plurality of second electromagnetic valves are connected to form a second node; the second end of the battery cold plate is connected with third electromagnetic valves and fourth electromagnetic valves, the plurality of third electromagnetic valves are connected to form a third node, and the plurality of fourth electromagnetic valves are connected to form a fourth node; the first system comprises a first compressor which is connected with a first node through a heat exchanger, and a third node is connected with the first compressor. The second system comprises a second compressor and a condensation assembly, the second compressor is connected with the condensation assembly, the condensation assembly is connected with the fourth node and the second node, and the second node is connected with the second compressor through the heat exchanger. Therefore, different groups of battery cold plates can be cooled and heated at the same time.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy storage battery thermal management systems, and specifically relates to a cascade direct cooling and direct heating energy storage battery thermal management system. Background Art

[0002] Batteries are an important component of energy storage systems. Energy storage batteries mainly refer to batteries used in solar power generation equipment, wind power generation equipment, and renewable energy storage. Energy storage batteries usually need to be used within a reasonable temperature range to ensure their performance, reliability, and service life. At present, the temperature control methods of energy storage batteries mainly include air cooling, liquid cooling, and direct cooling. Compared with the first two, direct cooling has higher energy efficiency and is more suitable for the future technological development of energy storage batteries.

[0003] The direct cooling refrigeration system of the prior art can usually only perform a single cooling or heating of the battery cold plate. However, when there are multiple groups of battery cold plates, and due to the influence of temperature, the multiple groups of battery cold plates may need to cool some of the battery cold plates and heat other battery cold plates at the same time, so it is necessary to configure multiple groups of direct cooling refrigeration systems according to the needs of the multiple groups of battery cold plates, which causes the problem of increased cost, and it is necessary to adjust the multiple groups of direct cooling refrigeration systems at the same time, which reduces the stability and cooling effect of the refrigeration system due to the influence of the temperature environment. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide a cascade direct-cooling and direct-heating energy storage battery thermal management system, which can realize the function of cooling or heating cold plates of different groups of batteries at the same time.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] A cascade direct cooling and direct heating energy storage battery thermal management system, comprising a battery cold plate group, a heat exchanger, a first system, and a second system;

[0007] The battery cold plate group includes a plurality of battery cold plates, wherein a first end of the battery cold plate is connected to a first branch and a second branch, a second end of the battery cold plate is connected to a third branch and a fourth branch, the first branch is connected to a first battery valve, and a plurality of first solenoid valves are connected to form a first node; the second branch is connected to a second solenoid valve, and a plurality of second solenoid valves are connected to form a second node; the third branch is connected to a third solenoid valve, and a plurality of third solenoid valves are connected to form a third node; the fourth branch is connected to a fourth solenoid valve, and a plurality of fourth solenoid valves are connected to form a fourth node;

[0008] The first system comprises a first compressor, a fifth solenoid valve and an evaporation component, the outlet of the first compressor is connected to the first inlet of the heat exchanger, the first outlet of the heat exchanger is connected to the first node, the third node is connected to the inlet of the first compressor, the fifth solenoid valve is connected to the inlet of the evaporation component, the inlet of the evaporation component is connected to the first node through the fifth solenoid valve, and the outlet of the evaporation component is connected to the third node;

[0009] The second system includes a second compressor, a condensing component and a sixth solenoid valve. The outlet of the second compressor is connected to the inlet of the condensing component. The outlet of the condensing component is connected to a first branch and a second branch. The first branch is connected to a fourth node. The second branch is connected to the second node through the sixth solenoid valve. The second branch is connected to the second inlet of the heat exchanger through the sixth solenoid valve. The second outlet of the heat exchanger is connected to the inlet of the second compressor.

[0010] Furthermore, a first expansion valve is connected between the first end of the battery cold plate and the first branch and the second branch; a second expansion valve is connected between the fifth solenoid valve and the evaporation component; and a third expansion valve is connected between the second inlet of the heat exchanger and the sixth solenoid valve and the second node.

[0011] Furthermore, a first pressure sensor and a first temperature sensor are connected between the second end of the battery cold plate and the third branch and the fourth branch; a second pressure sensor and a second temperature sensor are connected between the first outlet and the first node of the heat exchanger; and a third pressure sensor and a third temperature sensor are connected between the inlet of the first compressor and the second node.

[0012] Furthermore, the first system also includes a first liquid storage tank, the first outlet of the heat exchanger is connected to the inlet of the first liquid storage tank, and the outlet of the liquid storage tank is connected to the first node; the second system also includes a second liquid storage tank, the second node is connected to the inlet of the liquid storage tank, and the outlet of the second liquid storage tank is connected to the second inlet of the heat exchanger.

[0013] Furthermore, the first system further comprises a first drying filter, which is connected to the inlet of the first liquid storage tank; the second system further comprises a second drying filter, which is connected to the inlet of the second liquid storage tank.

[0014] Furthermore, the first system further comprises a first sight glass connected to the outlet of the first liquid storage tank; the second system further comprises a second sight glass connected to the outlet of the second liquid storage tank.

[0015] Furthermore, the first system also includes a first gas-liquid separator, the third node is connected to the inlet of the first gas-liquid separator, and the outlet of the first gas-liquid separator is connected to the inlet of the first compressor; the second system also includes a second gas-liquid separator, the second outlet of the heat exchanger is connected to the inlet of the second gas-liquid separator, and the outlet of the second gas-liquid separator is connected to the inlet of the second compressor.

[0016] Furthermore, the second node is provided with an outlet splitter, and the fourth node is provided with an inlet splitter.

[0017] Furthermore, it also includes a liquid storage system, which includes a refrigerant storage tank, a fourth expansion valve, a fifth expansion valve, a sixth expansion valve, a seventh expansion valve and an eighth expansion valve; two branches are led out from the first end of the refrigerant storage tank, and the two branches are respectively connected to the fourth expansion valve and the fifth expansion valve; two branches are led out from the second end of the refrigerant storage tank, and the two branches are respectively connected to the sixth expansion valve and the seventh expansion valve; the refrigerant storage tank is connected to the outlet of the condensing component through the fourth expansion valve; the refrigerant storage tank is connected to the first node through the fifth expansion valve; the refrigerant storage tank is connected to the second outlet of the heat exchanger through the sixth expansion valve; the refrigerant storage tank is connected to the third node through the seventh expansion valve.

[0018] The utility model has the following beneficial effects:

[0019] The utility model arranges a battery cold plate assembly, a heat exchanger, a first system and a second system, utilizes a plurality of cold plates arranged in parallel in a battery cold plate group, and arranges each section of the battery cold plate into two branches to connect a corresponding first solenoid valve, a second solenoid valve, a third solenoid valve or a fourth solenoid valve, and at the same time, a plurality of first solenoid valves, second solenoid valves, third solenoid valves or fourth solenoid valves are connected to form a corresponding first node, a second node, a third node or a fourth node, wherein the first node and the third node are connected to the first system, and the second node and the fourth node are connected to the second system; wherein, after the first compressor in the first system transmits the refrigerant to the heat exchanger for heat exchange, and the refrigerant flows into the battery cold plate group, the battery cold plate group can open the first solenoid valve and the third solenoid valve of the corresponding battery cold plate that needs to be refrigerated according to the cooling needs, so that the refrigerant cools the corresponding battery cold plate; and after the second compressor in the second system transmits the refrigerant to the battery cold plate group, the battery cold plate group can open the second solenoid valve and the fourth solenoid valve of the corresponding battery cold plate that needs to be heated according to the heating needs, so that the refrigerant heats the corresponding battery cold plate. When the first system closes the fifth solenoid valve and the sixth solenoid valve, the first system and the second system are operated at the same time, and the cooling solenoid valve or the heating solenoid valve corresponding to the battery cold plate in the battery cold plate group that needs cooling or heating is opened at the same time, the operation of cooling or heating different battery cold plates at the same time can be realized. Compared with the prior art that uses an independent heating system or an independent cooling system to cool and heat the corresponding battery cold plates at the same time, the battery thermal management system of the utility model only needs a single system to achieve simultaneous cooling and heating, so it has the beneficial effects of simple structure, cost saving, and high working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the thermal management system of the cascade direct-cooling and direct-heating energy storage battery of the utility model.

[0021] In the figure: 1. first gas-liquid separator; 2. third temperature sensor; 3. third pressure sensor; 4. first compressor; 5. heat exchanger; 501. first inlet; 502. first outlet; 503. second inlet; 504. second outlet; 6. first filter dryer; 7. first liquid storage tank; 8. first sight glass; 9. second pressure sensor; 10. second temperature sensor; 11. cooling inlet solenoid valve A; 12. expansion valve A; 13. cooling outlet battery valve A; 14. pressure sensor A; 15. temperature sensor A; 16. battery cold plate A; 17. cooling inlet solenoid valve B; 18. expansion valve B; 19. cooling outlet battery valve B; 20. pressure sensor B; 21. temperature sensor B; 22. battery cold plate B; 23. cooling inlet solenoid valve C; 24. expansion valve C; 25. cooling outlet battery valve C; 26. pressure sensor C; 27 , temperature sensor C; 28, battery cold plate C; 29, the fifth solenoid valve; 30, the second expansion valve; 31, evaporation assembly; 3101, evaporator; 3102, evaporation fan; 32, one-way valve; 41, the second gas-liquid separator; 42, the second compressor; 43, the condensation assembly; 4301, the condenser; 4302, the condensation wind; 44, the sixth solenoid valve; 45, the second drying filter; 46, the second liquid storage tank; 47, the second sight glass; 48, the third expansion valve; 49, the fourth expansion valve; 50, the refrigerant storage tank; 51, the sixth expansion valve; 52, the seventh expansion valve; 53, the fifth expansion valve; 54, the outlet diverter; 54, the inlet diverter; 56, the heating outlet solenoid valve A; 57, the heating outlet solenoid valve B; 58, the heating outlet solenoid valve C; 59, the heating inlet solenoid valve A; 60, the heating inlet solenoid valve B; 61, the heating inlet solenoid valve C. DETAILED DESCRIPTION

[0022] The following is a further detailed description of the present invention in conjunction with the accompanying drawings and specific embodiments. The terms such as "upper", "inner", "middle", "left", "right" and "one" used in this specification are only used to facilitate the description and are not used to limit the scope of the present invention. The changes or adjustments in their relative relationships shall also be regarded as the scope of the present invention without substantially changing the technical content.

[0023] A cascade direct cooling and direct heating energy storage battery thermal management system, such as Figure 1 As shown, it includes a battery cold plate group, a heat exchanger 5, a first system, a second system and a liquid storage system; the first system and the second system can work simultaneously, and the heat exchanger 5 is used to cool the battery cold plate group separately, heat it separately, or cool and heat it simultaneously, and the liquid storage system is used to supplement the refrigerant when the first system and / or the second system is working when the refrigerant is reduced, or to store the refrigerant when there is too much refrigerant.

[0024] The battery cold plate group includes a plurality of battery cold plates. In this embodiment, the number of battery cold plates is three. In practice, a corresponding number of battery cold plates can be set according to the situation. The first end of the battery cold plate is connected to the first branch and the second branch, and the second end of the battery cold plate is connected to the third branch and the fourth branch. The first branch is connected to the first battery valve, and the ends of the plurality of first solenoid valves away from the battery cold plate are connected through a pipeline to form a first node; the second branch is connected to the second solenoid valve, and the ends of the plurality of second solenoid valves away from the battery cold plate are connected through a pipeline to form a second node; the third branch is connected to the third solenoid valve, and the ends of the plurality of third solenoid valves away from the battery cold plate are connected through a pipeline to form a third node; the fourth branch is connected to the fourth solenoid valve, and the ends of the plurality of fourth solenoid valves away from the battery cold plate are connected through a pipeline to form a fourth node;

[0025] The first solenoid valve corresponds to this embodiment Figure 1 The cooling inlet solenoid valve A11, the cooling inlet solenoid valve B17, and the cooling inlet solenoid valve C23;

[0026] The second solenoid valve corresponds to this embodiment Figure 1 The heating outlet solenoid valve A56, the heating outlet solenoid valve B57, and the heating outlet solenoid valve C58;

[0027] The third solenoid valve corresponds to this embodiment Figure 1 The cooling battery outlet valve A13, cooling battery outlet valve B19, cooling battery outlet valve C25;

[0028] The fourth solenoid valve corresponds to the embodiment Figure 1 The heating inlet solenoid valve A59, the heating inlet solenoid valve B60, and the heating inlet solenoid valve C61;

[0029] The battery cold plate corresponds to this embodiment Figure 1 The battery cold plate A16, the battery cold plate B22, and the battery cold plate C28.

[0030] The first node and the third node are used to connect with the first system, and by controlling the corresponding first solenoid valve and the third solenoid valve, the corresponding battery cold plate is connected to the first system and the heat exchanger 5, so that the first system cools or heats the corresponding battery cold plate; the second node and the fourth node are used to connect with the second system, and by controlling the corresponding second solenoid valve and the fourth solenoid valve, the corresponding battery cold plate is connected to the second system and the heat exchanger 5, so that the second system cools or heats the corresponding battery cold plate. The second node is provided with an outlet diverter 54, and the fourth node is provided with an inlet diverter 54; thus, by providing the outlet diverter 54 and the inlet diverter 54, the refrigerant of the second system enters the fourth node from the inlet diverter 54, passes through the corresponding battery cold plate, and then flows back to the second system from the outlet diverter 54 of the second node.

[0031] The first system includes a first compressor 4, a fifth solenoid valve 29, and an evaporation component 31. The outlet of the first compressor 4 is connected to the first inlet 501 of the heat exchanger 5, the first outlet 502 of the heat exchanger 5 is connected to the first node, the third node is connected to the inlet of the first compressor 4, the fifth solenoid valve 29 is connected to the inlet of the evaporation component 31, the inlet of the evaporation component 31 is connected to the first node through the fifth solenoid valve 29, and the outlet of the evaporation component 31 is connected to the third node. The evaporation component 31 includes an evaporator 3101 and an evaporation fan 3102.

[0032] The second system includes a second compressor 42, a condensing assembly 43, and a sixth solenoid valve 44. The outlet of the second compressor 42 is connected to the inlet of the condensing assembly 43. The outlet of the condensing assembly 43 is connected to a first branch and a second branch. The first branch is connected to the fourth node. The second branch is connected to the second node through the sixth solenoid valve 44. The second branch is connected to the second inlet 503 of the heat exchanger 5 through the sixth solenoid valve 44. The second outlet 504 of the heat exchanger 5 is connected to the inlet of the second compressor 42. The condensing assembly 43 includes a condenser 4301 and a condensing fan 4302.

[0033] Therefore, the cascade direct-cooling and direct-heating energy storage battery thermal management system of the utility model has an operation mode of cooling or heating the battery cold plate group separately or cooling and heating at the same time.

[0034] In the refrigeration mode for the battery cold plate group alone: ​​the first compressor 4, the second compressor 42 and the sixth solenoid valve 44 are turned on, and the corresponding first solenoid valve and the third solenoid valve are turned on as needed. In the second system, the second compressor 42 transmits the refrigerant to the condensation component 43 to cool the refrigerant. The refrigerant further enters the second inlet 503 of the heat exchanger 5 through the sixth solenoid valve 44, and then flows out from the second outlet 504 of the heat exchanger 5 and flows back to the second compressor 42. In the first system, the first compressor 4 transmits the refrigerant to the first inlet 501 of the heat exchanger 5, and uses the low-temperature refrigerant of the first system in the heat exchanger 5 to cool the refrigerant of the second system. The refrigerant further flows out from the first outlet 502 of the heat exchanger 5 and enters the first node. The refrigerant enters the corresponding battery cold plate to cool the corresponding battery cold plate, and then flows out from the third node and flows back to the first compressor 4, thereby realizing a refrigeration cycle for cooling the corresponding battery cold plate.

[0035] In the mode of heating the battery cold plate group separately: the first compressor 4, the second compressor 42 and the fifth solenoid valve 29 are turned on, and the corresponding second solenoid valve and the fourth solenoid valve are turned on as needed. In the second system, the second compressor 42 transmits the refrigerant to the condensing component 43, and then transmits the refrigerant to the corresponding battery cold plate through the fourth node to heat the corresponding battery cold plate, and then flows out from the second node, enters the second inlet 503 of the heat exchanger 5, and then flows out from the second outlet 504 of the heat exchanger 5, and flows back to the second compressor 42; in the first system, the first compressor 4 transmits the refrigerant to the first inlet 501 of the heat exchanger 5, and then flows out from the first outlet 502 of the heat exchanger 5, and is transmitted to the evaporation component 31 through the fifth solenoid valve 29, and the refrigerant is heated by the evaporation component 31, and then flows back to the first compressor 4; during the reflux process of the refrigerant in the first system, the refrigerant transmitted in the second system can be heated by the heat exchanger 5.

[0036] In the simultaneous cooling and heating mode of the battery cold plate group: the first compressor 4 and the second compressor 42 are turned on, the second solenoid valve and the fourth battery valve corresponding to the battery cold plate that needs heating are turned on, and the first solenoid valve and the third solenoid valve corresponding to the battery cold plate that needs cooling are turned on. In the second system, the second compressor 42 transmits the refrigerant to the condensing assembly 43, and then enters the fourth node through the inlet diverter 54 to transmit the refrigerant to the corresponding battery cold plate that needs heating for heating, and then flows out from the second node. The refrigerant is further transmitted to the second inlet 503 of the heat exchanger 5, and then flows out from the second outlet 504 of the heat exchanger 5, and flows back to the second compressor 42; in the first system, the first compressor 4 transmits the refrigerant to the first inlet 501 of the heat exchanger 5, flows out from the first outlet 502 of the heat exchanger 5, enters the first node, so as to transmit the refrigerant to the corresponding battery cold plate that needs cooling for cooling, and then flows out from the third node and flows back to the first compressor 4.

[0037] A first expansion valve is connected between the first end of the battery cold plate and the first branch and the second branch, so that the opening degree of the first expansion valve can be adjusted. When adjusting the cooling mode, the flow rate of the refrigerant entering the battery cold plate can be adjusted to achieve better cooling. At the same time, when in the heating mode, the flow rate of the refrigerant flowing out of the battery cold plate can be adjusted to reduce the impact force of the high-temperature refrigerant, thereby protecting the pipeline and corresponding components. Among them, one expansion valve corresponds to this embodiment Figure 1 Expansion valve A12, expansion valve B18, and expansion valve C24.

[0038] A second expansion valve 30 is connected between the fifth solenoid valve 29 and the evaporation component 31 to adjust the flow rate of the refrigerant in the first system before it flows into the evaporation component 31, so that the flow rate of the refrigerant entering or flowing out of the evaporation component 31 reaches a relatively balanced state, thereby realizing the function of protecting the pipeline and the evaporation component 31.

[0039] A third expansion valve 48 is connected between the second inlet 503 of the heat exchanger 5, the sixth solenoid valve 44 and the second node to adjust the flow rate of the refrigerant in the second system before it flows into the heat exchanger 5, prevent the high-temperature refrigerant from damaging the heat exchanger 5 due to the large impact force, and protect the corresponding pipelines.

[0040] In order to facilitate real-time monitoring of the temperature and pressure of the refrigerant flowing into or out of the battery cold plate, the temperature and pressure of the refrigerant in the first system when it flows out from the first outlet 502 of the heat exchanger 5, and the temperature and pressure of the refrigerant in the first system before it flows back to the first compressor 4, the following settings are made: a first pressure sensor and a first temperature sensor are connected between the second end of the battery cold plate and the third branch and the fourth branch; a second pressure sensor 9 and a second temperature sensor 10 are connected between the first outlet 502 of the heat exchanger 5 and the first node; a third pressure sensor 3 and a third temperature sensor 2 are connected between the inlet of the first compressor 4 and the second node. The first pressure sensor and the second sensor correspond to the first pressure sensor and the second temperature sensor of this embodiment. Figure 1 Pressure sensor A14, temperature sensor A15, pressure sensor B20, temperature sensor B21, pressure sensor C26, and temperature sensor C27.

[0041] In order to temporarily store the refrigerant flowing out of the first outlet 502 of the heat exchanger 5, to adjust the opening of the corresponding expansion valve (the first expansion valve and the second expansion valve 30) according to the corresponding cooling, heating, and simultaneous cooling and heating modes, and to adapt to the flow rate of the refrigerant transmitted in the first system, thereby reducing the situation where the refrigerant flow rate is too large and damages the corresponding pipeline or corresponding components. The first system also includes a first liquid storage tank 7, the first outlet 502 of the heat exchanger 5 is connected to the inlet of the first liquid storage tank 7, and the outlet of the liquid storage tank is connected to the first node.

[0042] In order to temporarily store the refrigerant before it flows into the second inlet 503 of the heat exchanger 5, the opening of the corresponding solenoid valve (the first expansion valve and the third expansion valve 48) is adjusted according to the corresponding cooling, heating, and simultaneous cooling and heating modes, and the flow rate of the refrigerant transmitted in the first system is adapted, thereby reducing the situation where the refrigerant flow rate is too large and damages the corresponding pipeline or heat exchanger 5. The second system also includes a second liquid storage tank 46, the second node is connected to the inlet of the liquid storage tank, and the outlet of the second liquid storage tank 46 is connected to the second inlet 503 of the heat exchanger 5.

[0043] In order to facilitate the observation of the capacity of the refrigerant in the first liquid storage tank 7 and the second liquid storage tank 46, the first system also includes a first sight glass 8, which is connected to the outlet of the first liquid storage tank 7; the second system also includes a second sight glass 47, which is connected to the outlet of the second liquid storage tank 46.

[0044] In order to dry the refrigerant flowing out of the first outlet 502 of the heat exchanger 5 in the first system, remove water vapor in the refrigerant, and reduce the flow rate of the refrigerant, the first system further includes a first drying filter 6, which is connected to the inlet of the first liquid storage tank 7. Similarly, in order to dry the refrigerant before flowing into the second inlet 503 of the heat exchanger 5 in the second system, remove water vapor in the refrigerant, and reduce the flow rate of the refrigerant, the second system further includes a second drying filter 45, which is connected to the inlet of the second liquid storage tank 46.

[0045] In order to separate the refrigerant flowing back to the first compressor 4 and the second compressor 42 into gas and liquid, and to liquefy the gaseous refrigerant in the refrigerant, thereby reducing the impact force of the first compressor 4 and the second compressor 42. The first system also includes a first gas-liquid separator 1, the third node is connected to the inlet of the first gas-liquid separator 1, and the outlet of the first gas-liquid separator 1 is connected to the inlet of the first compressor 4; the second system also includes a second gas-liquid separator 41, the second outlet 504 of the heat exchanger 5 is connected to the inlet of the second gas-liquid separator 41, and the outlet of the second gas-liquid separator 41 is connected to the inlet of the second compressor 42.

[0046] The liquid storage system includes a refrigerant storage tank 50, a fourth expansion valve 49, a fifth expansion valve 53, a sixth expansion valve 51, a seventh expansion valve 52 and an eighth expansion valve; two branches are led out from the first end of the refrigerant storage tank 50, and the two branches are respectively connected to the fourth expansion valve 49 and the fifth expansion valve 53; two branches are led out from the second end of the refrigerant storage tank 50, and the two branches are respectively connected to the sixth expansion valve 51 and the seventh expansion valve 52; the refrigerant storage tank 50 is connected to the outlet of the condensing component 43 through the fourth expansion valve 49; the refrigerant storage tank 50 is connected to the first node through the fifth expansion valve 53; the refrigerant storage tank 50 is connected to the second outlet 504 of the heat exchanger 5 through the sixth expansion valve 51; the refrigerant storage tank 50 is connected to the third node through the seventh expansion valve 52.

[0047] Therefore, when the system adjusts the amount of refrigerant, when the refrigerant amounts of the first system and the second system are not within a reasonable range due to the switching between cooling and heating, the refrigerant is recovered and replenished to make the refrigerant amount within a reasonable range.

[0048] Regarding the recovery or replenishment of the refrigerant in the first system: when the refrigerant in the first system is insufficient, the seventh expansion valve 52 is opened to replenish the refrigerant in the refrigerant storage tank 50 to the first system; when the refrigerant in the first system is excessive, the fifth expansion valve 53 is opened to recover the excess refrigerant in the first system to the refrigerant storage tank 50.

[0049] Regarding the recovery or replenishment of the refrigerant in the second system: when the refrigerant in the second system is insufficient, the sixth expansion valve 51 is opened to replenish the refrigerant in the refrigerant storage tank 50 to the first system; when the refrigerant in the second system is excessive, the fourth expansion valve 49 is opened to recover the excess refrigerant in the second system to the refrigerant storage tank 50.

[0050] In summary, the utility model is provided with a battery cold plate assembly, a heat exchanger 5, a first system and a second system, and utilizes a plurality of cold plates arranged in parallel in a battery cold plate group, and each section of the battery cold plate is set into two branches to connect the corresponding first solenoid valve, the second solenoid valve, the third solenoid valve or the fourth solenoid valve, and at the same time, the plurality of first solenoid valves, the second solenoid valves, the third solenoid valves or the fourth solenoid valves are connected to form a corresponding first node, a second node, a third node or a fourth node, wherein the first node and the third node are connected to the first system, and the second node and the fourth node are connected to the second system; wherein, after the first compressor 4 in the first system transmits the refrigerant to the heat exchanger 5 for heat exchange, and the refrigerant flows into the battery cold plate group, the battery cold plate group can open the first solenoid valve and the third solenoid valve of the corresponding battery cold plate that needs to be refrigerated according to the cooling needs, so that the refrigerant cools the corresponding battery cold plate; and after the second compressor 42 in the second system transmits the refrigerant to the battery cold plate group, the battery cold plate group can open the second solenoid valve and the fourth solenoid valve of the corresponding battery cold plate that needs to be heated according to the heating needs, so that the refrigerant heats the corresponding battery cold plate. When the first system closes the fifth solenoid valve 29 and the sixth solenoid valve 44, the first system and the second system are operated at the same time, and the cooling solenoid valve or the heating solenoid valve corresponding to the battery cold plate in the battery cold plate group that needs cooling or heating is opened at the same time, the operation of cooling or heating different battery cold plates at the same time can be realized. Compared with the prior art that uses an independent heating system or an independent cooling system to cool and heat the corresponding battery cold plates at the same time, the battery thermal management system of the utility model only needs a single system to achieve simultaneous cooling and heating, so it has the beneficial effects of simple structure, cost saving, and high efficiency.

[0051] The implementation methods of the utility model are not limited to this. According to the above content of the utility model, by using common technical knowledge and customary means in the field, without departing from the above basic technical ideas of the utility model, the utility model can also make other various forms of modification, replacement or combination, all of which fall within the scope of protection of the utility model.

Claims

1. A cascade direct cooling and direct heating energy storage battery thermal management system, It is characterized in that It includes a battery cold plate group, a heat exchanger, a first system, and a second system; The battery cold plate group includes a plurality of battery cold plates, wherein a first end of the battery cold plate is connected to a first branch and a second branch, a second end of the battery cold plate is connected to a third branch and a fourth branch, the first branch is connected to a first battery valve, and a plurality of first solenoid valves are connected to form a first node; the second branch is connected to a second solenoid valve, and a plurality of second solenoid valves are connected to form a second node; the third branch is connected to a third solenoid valve, and a plurality of third solenoid valves are connected to form a third node; the fourth branch is connected to a fourth solenoid valve, and a plurality of fourth solenoid valves are connected to form a fourth node; The first system comprises a first compressor, a fifth solenoid valve and an evaporation component, the outlet of the first compressor is connected to the first inlet of the heat exchanger, the first outlet of the heat exchanger is connected to the first node, the third node is connected to the inlet of the first compressor, the fifth solenoid valve is connected to the inlet of the evaporation component, the inlet of the evaporation component is connected to the first node through the fifth solenoid valve, and the outlet of the evaporation component is connected to the third node; The second system includes a second compressor, a condensing component and a sixth solenoid valve. The outlet of the second compressor is connected to the inlet of the condensing component. The outlet of the condensing component is connected to a first branch and a second branch. The first branch is connected to a fourth node. The second branch is connected to the second node through the sixth solenoid valve. The second branch is connected to the second inlet of the heat exchanger through the sixth solenoid valve. The second outlet of the heat exchanger is connected to the inlet of the second compressor.

2. The cascade direct cooling and direct heating energy storage battery thermal management system according to claim 1, It is characterized in that A first expansion valve is connected between the first end of the battery cold plate and the first branch and the second branch; a second expansion valve is connected between the fifth solenoid valve and the evaporation component; and a third expansion valve is connected between the second inlet of the heat exchanger and the sixth solenoid valve and the second node.

3. The cascade direct cooling and direct heating energy storage battery thermal management system according to claim 1, It is characterized in that A first pressure sensor and a first temperature sensor are connected between the second end of the battery cold plate and the third branch and the fourth branch; a second pressure sensor and a second temperature sensor are connected between the first outlet and the first node of the heat exchanger; and a third pressure sensor and a third temperature sensor are connected between the inlet of the first compressor and the second node.

4. The cascade direct cooling and direct heating energy storage battery thermal management system according to claim 1, It is characterized in that The first system also includes a first liquid storage tank, the first outlet of the heat exchanger is connected to the inlet of the first liquid storage tank, and the outlet of the liquid storage tank is connected to the first node; the second system also includes a second liquid storage tank, the second node is connected to the inlet of the liquid storage tank, and the outlet of the second liquid storage tank is connected to the second inlet of the heat exchanger.

5. The cascade direct cooling and direct heating energy storage battery thermal management system as claimed in claim 4, It is characterized in that The first system further includes a first drying filter connected to the inlet of the first liquid storage tank; the second system further includes a second drying filter connected to the inlet of the second liquid storage tank.

6. The cascade direct cooling and direct heating energy storage battery thermal management system according to claim 4, It is characterized in that The first system further includes a first sight glass connected to the outlet of the first liquid storage tank; the second system further includes a second sight glass connected to the outlet of the second liquid storage tank.

7. The cascade direct cooling and direct heating energy storage battery thermal management system according to claim 1, It is characterized in that The first system also includes a first gas-liquid separator, the third node is connected to the inlet of the first gas-liquid separator, and the outlet of the first gas-liquid separator is connected to the inlet of the first compressor; the second system also includes a second gas-liquid separator, the second outlet of the heat exchanger is connected to the inlet of the second gas-liquid separator, and the outlet of the second gas-liquid separator is connected to the inlet of the second compressor.

8. The cascade direct cooling and direct heating energy storage battery thermal management system according to any one of claims 1 to 7, It is characterized in that It also includes a liquid storage system, which includes a refrigerant storage tank, a fourth expansion valve, a fifth expansion valve, a sixth expansion valve, a seventh expansion valve and an eighth expansion valve; two branches are led out from the first end of the refrigerant storage tank, and the two branches are respectively connected to the fourth expansion valve and the fifth expansion valve; two branches are led out from the second end of the refrigerant storage tank, and the two branches are respectively connected to the sixth expansion valve and the seventh expansion valve; the refrigerant storage tank is connected to the outlet of the condensing component through the fourth expansion valve; the refrigerant storage tank is connected to the first node through the fifth expansion valve; the refrigerant storage tank is connected to the second outlet of the heat exchanger through the sixth expansion valve; the refrigerant storage tank is connected to the third node through the seventh expansion valve.

9. The cascade direct cooling and direct heating energy storage battery thermal management system according to claim 1, It is characterized in that The second node is provided with an outlet splitter, and the fourth node is provided with an inlet splitter.

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