Direct cooling and heating management system of energy storage device

Abstract

The utility model belongs to the technical field of energy storage, and particularly relates to a direct cooling and heating management system of an energy storage device. Comprising a direct cooling system and a direct cooling assembly for cooling a battery cluster, the direct cooling assembly comprises a liquid inlet header pipe and a liquid return header pipe, a plurality of direct cooling plate groups are arranged between the liquid inlet header pipe and the liquid return header pipe, each direct cooling plate group comprises a plate group liquid inlet pipe and a plate group liquid return pipe, and the direct cooling system further comprises a plurality of direct cooling plates arranged in parallel, the plate set liquid return pipe is located at the rear end of the direct cooling plate, the plate set liquid inlet pipe is located at the front end of the direct cooling plate, the direct cooling plate is connected with the plate set liquid inlet pipe and the plate set liquid return pipe, and an electronic expansion valve is arranged on a pipeline where the direct cooling plate is connected with the plate set liquid return pipe. According to the direct cooling heat management system of the energy storage device, the electronic expansion valve is arranged at the backflow end of the direct cooling plate to accurately control the flow of the cooling medium in the direct cooling plate, so that the temperature uniformity of each direct cooling plate group is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of energy storage, especially relates to a direct cooling heat management system of energy storage device. BACKGROUND

[0002] An energy storage system is a device or system that can store energy, which can store excess energy and use it when needed. Energy storage systems are often used to improve energy utilization efficiency, reduce energy waste, improve power grid stability, etc. Energy storage systems can include batteries, supercapacitors, flywheels, hydraulic systems, etc. Devices or technologies, among which batteries are one of the most commonly used energy storage methods. Energy storage systems can be used in various application scenarios, such as power grid peak shaving, renewable energy grid connection, electric vehicle charging, home energy storage, etc.

[0003] In the liquid cooling system, the refrigeration system first transmits energy to the coolant, and then the coolant transmits energy to the battery cell for heat exchange. In this way, from the perspective of heat transfer, there are three media for twice heat exchange, in order to ensure the temperature difference heat transfer of each heat exchange, the refrigeration medium and the user have a temperature difference of 20 degrees. Because of the increase of temperature difference, the energy consumption of the refrigeration system is greatly increased.

[0004] At present, most of the thermal management systems of various energy storage devices use liquid cooling systems for battery heat management. Liquid cooling systems have many advantages such as mature technology and stable operation. However, when the liquid cooling system is applied in an environment with large temperature difference, in order to ensure that the minimum temperature liquid does not freeze, only the coolant that can adapt to the minimum temperature can be used, which will result in a large cost demand. At the same time, because the freezing point of the coolant is lowered, its specific heat capacity is also greatly reduced, which leads to the fact that the circulation flow of the coolant must be increased to ensure the temperature difference of the battery.

[0005] In the liquid cooling system, the refrigeration system first transmits energy to the coolant, and then the coolant transmits energy to the battery cell for heat exchange. In this way, from the perspective of heat transfer, there are three media for twice heat exchange, in order to ensure the temperature difference heat transfer of each heat exchange, the refrigeration medium and the user have a temperature difference of 20 degrees. Because of the increase of temperature difference, the energy consumption of the refrigeration system is greatly increased.

[0006] Because the coolant acts as an "intermediary", it needs to be equipped with a heat exchange mechanism between the refrigeration system and the battery, which leads to the increase of the mechanism and the cost of the mechanism.

[0007] The circulation of the coolant often needs a high-power water pump, which increases the energy consumption, increases the space occupation of the mechanism, and also increases the vibration of the machine, etc. It increases a lot of burden on the construction cost and use cost.

[0008] The refrigerant itself is a chemical product, which is restricted in many countries, so that the energy storage product using the liquid cooling system also increases the certification burden, and even loses the market because of its existence. SUMMARY

[0009] In view of the shortcomings of the prior art, the utility model discloses a kind of direct cooling heat management systems of energy storage device.

[0010] The technical scheme of the utility model is as follows:

[0011] A kind of direct cooling heat management system of energy storage device, including its including direct cooling system, and the direct cooling assembly of battery cluster cooling, the direct cooling assembly include liquid inlet main pipe, back liquid main pipe, be provided with several direct cooling plate groups between liquid inlet main pipe and back liquid main pipe, the direct cooling plate group includes plate group liquid inlet pipe and plate group back liquid pipe, and further include several direct cooling plates of parallel arrangement, the plate group back liquid pipe is located at the rear end of direct cooling plate, plate group liquid inlet pipe is located at the front end of direct cooling plate, the direct cooling plate is connected with plate group liquid inlet pipe and plate group back liquid pipe, electronic expansion valve is provided on the pipeline of the direct cooling plate and plate group back liquid pipe connection.

[0012] Further, the direct cooling plate includes a plate body, the plate body is rectangular, the right end of the upper end of the plate body is provided with liquid inlet, the first direct cooling pipeline that is communicated with the liquid inlet is arranged in the plate body, the length of the first direct cooling pipeline is half of the width of the plate body, the left side of the lower end of the plate body is provided with the second direct cooling pipeline that is symmetric with the center of the first direct cooling pipeline, the right end of the lower end of the plate body is provided with liquid outlet, the lower end of the second direct cooling pipeline extends to the right end of the plate body along the lower end of the plate body and is communicated with the liquid outlet, the first coil pipe is connected between the upper part of the first direct cooling pipeline and the upper part of the second direct cooling pipeline, the second coil pipe is connected between the lower part of the first direct cooling pipeline and the lower part of the second direct cooling pipeline, and the length of the first coil pipe and the second coil pipe is same.

[0013] Further, the first coil pipe and the second coil pipe are S-shaped coil pipes arranged along the length direction of the plate body.

[0014] Further, the direct cooling system includes compressor, four-way valve, air cooling assembly and electric heating assembly, the air cooling assembly and electric heating assembly are connected in parallel, one end of the air cooling assembly and electric heating assembly is connected with back liquid main pipe, the other end of the air cooling assembly and electric heating assembly is connected with one inlet of four-way valve, one outlet of four-way valve is connected with liquid inlet main pipe, one end of the compressor is connected with the other inlet of four-way valve, the other outlet of four-way valve is connected with the other end of the compressor.

[0015] Further, the air cooling assembly includes condenser and fan for cooling the condenser, one end of the condenser is provided with first proportional valve.

[0016] Further, the electric heating assembly comprises a water tank, a coil evaporator is arranged in the water tank, one end of the coil evaporator is connected with the liquid return main pipe, the other end of the coil evaporator is connected with an inlet of the four-way valve, an electric heater is further arranged in the water tank, the electric heater is located at the center of the coil evaporator, and the one end of the coil evaporator is provided with the second proportional valve.

[0017] In summary, the utility model has the following beneficial effects:

[0018] The utility model discloses a kind of energy storage device direct-cooling thermal management systems, the flow of cooling medium in direct-cooling plate is accurately controlled by setting electronic expansion valve in the backflow end of direct-cooling plate, to ensure the uniformity of the temperature of each direct-cooling plate group, so that the temperature of each direct-cooling plate group corresponding battery can also be uniformly controlled, further, the flow in direct-cooling plate is designed, ensure that the flow of heat exchange medium in the upper and lower two parts of direct-cooling plate is same, ensure the uniformity of the heat exchange of direct-cooling plate. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is structure diagram of direct-cooling plate of the utility model;

[0020] Figure 2 It is structure diagram of direct-cooling plate of the utility model;

[0021] Figure 3 It is structure diagram of air-cooled assembly of the utility model;

[0022] Figure 4 It is structure diagram of electric heating assembly of the utility model;

[0023] Fig. 1 is direct-cooling system,

[0024] 2 is direct-cooling assembly, 20 is liquid inlet main pipe, 21 is liquid return main pipe,

[0025] 22 is direct-cooling plate group, 220 is plate group liquid inlet pipe, 221 is plate group liquid return pipe, 222 is direct-cooling plate, 223 is electronic expansion valve,

[0026] 2220 is plate body, 2221 is liquid inlet, 2222 is first direct-cooling pipe, 2223 is second direct-cooling pipe, 2224 is liquid outlet, 2225 is first coil, 2226 is second coil,

[0027] 10 is compressor, 11 is four-way valve, 12 is air-cooled assembly, 13 is electric heating assembly,

[0028] 120 is condenser, 121 is fan, 122 is first proportional valve,

[0029] 130 is a water tank, 131 is a coil evaporator, 132 is an electric heater, and 133 is a second proportional valve. DETAILED DESCRIPTION

[0030] The present application will be further described with reference to the drawings and specific examples, so that those skilled in the art can better understand the present application and implement it.

[0031] It should be noted that when an element is referred to as being "on" or "fixed to" another element, it can be directly on or fixed to the other element or intervening elements can also be present. When an element is referred to as being "fixed to" or "connected to" another element, it can be fixedly connected to the other element or removably connected to the other element. When an element is referred to as being "connected" or "rotatably connected" to another element, it can be directly connected to the other element or intervening elements can also be present. The terms "vertical", "horizontal", "left", "right", "upper", "lower", and the like as used herein are used for explanation purposes only and not to limit the present application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this description, the terms "and / or" includes any and all combinations of one or more of the associated listed items.

[0033] The terms "first", "second", "third", and the like, as used in the description and the claims, do not imply a specific number of components or a specific order of components.

[0034] Referring to Figure 1 As shown in the drawings, a direct cooling energy storage device thermal management system includes a direct cooling system 1 and a direct cooling assembly 2 for cooling a battery pack. The direct cooling assembly 2 includes an inlet liquid main pipe 20 and a return liquid main pipe 21. A plurality of direct cooling plate groups 22 are arranged between the inlet liquid main pipe 20 and the return liquid main pipe 21. Each direct cooling plate group 22 includes a plate group inlet liquid pipe 220 and a plate group return liquid pipe 221. A plurality of direct cooling plates 222 are arranged in parallel. The plate group return liquid pipe 221 is located at the rear end of the direct cooling plate 222, and the plate group inlet liquid pipe 220 is located at the front end of the direct cooling plate 222. The direct cooling plate 222 is connected to the plate group inlet liquid pipe 220 and the plate group return liquid pipe 221. An electronic expansion valve 223 is arranged on the pipeline connected to the plate group return liquid pipe 221.

[0035] The utility model discloses the heat management system of energy storage device has carried out the improvement, first, design a kind of direct cooling heat management system using direct cooling carries out heat management, the mode of battery insertion box is directly cooled by refrigerant to radiate heat to battery pack, second, the direct cooling plate in the direct cooling plate group of the utility model is as evaporator, the temperature of battery box is controlled by heat exchange, further, the flow of direct cooling plate is accurately controlled by electronic expansion valve, to ensure the uniformity of the temperature of each direct cooling plate group, so that the temperature of the battery corresponding to each direct cooling plate group can also be evenly controlled, and the temperature control granularity is aligned.

[0036] In order to good heat exchange needs, ensure the heat exchange capacity of each part of direct cooling plate, the structure of direct cooling plate is limited, referring to Figure 2 As shown in the figure, the direct cooling plate 222 includes a plate body 2220, which is rectangular, and the right end of the upper end of the plate body is provided with a liquid inlet 2221, and the plate body 2220 is provided with a first direct cooling pipe 2222 which is in communication with the liquid inlet, the length of the first direct cooling pipe 2222 is half of the width of the plate body, and the left side of the lower end of the plate body 2220 is provided with a second direct cooling pipe 2223 which is centrally symmetrical with the first direct cooling pipe, and the right end of the lower end of the plate body is provided with a liquid outlet 2224, the lower end of the second direct cooling pipe extends to the right end of the plate body along the lower end of the plate body and is connected with the liquid outlet, and the upper part of the first direct cooling pipe 2222 is connected with the upper part of the second direct cooling pipe, and the lower part of the first direct cooling pipe is connected with the lower part of the second direct cooling pipe, and the length of the first coil and the second coil is the same, the utility model adopts the design of two-way coil, which ensures that the heat exchange medium has the same flow in the first coil and the second coil, so that the uniformity of the temperature of the direct cooling plate is avoided, and the problem of poor heat exchange effect at the end of the flow caused by long flow is avoided.

[0037] The first coil 2225 and the second coil 2225 are S-shaped coils arranged along the length direction of the plate body, and the first coil and the second coil adopt a 4mm small diameter and an 8-fold flow structure design.

[0038] Referring to Figure 1As shown, the direct cooling system 1 comprises a compressor 10, a four-way valve 11, an air cooling assembly 12 and an electric heating assembly 13, the air cooling assembly 12 and the electric heating assembly 13 are arranged in parallel, one end of the air cooling assembly 12 and the electric heating assembly 13 is connected with a liquid return main pipe 21, the other end of the air cooling assembly 12 and the electric heating assembly 13 is connected with one inlet of the four-way valve 11, one outlet of the four-way valve 11 is connected with a liquid inlet main pipe 20, one end of the compressor 10 is connected with the other inlet of the four-way valve 11, the other outlet of the four-way valve 11 is connected with the other end of the compressor 10, a direct cooling system is designed, the refrigeration / heat switching is realized through the four-way valve, and the electric heating assembly is used for auxiliary heating, when the system is in the low-temperature working condition for heating, the electric heating assembly is used for consuming the cold quantity, so that the defrosting stoppage hazard caused by the air cooling assembly in the low-temperature working condition is reduced.

[0039] Referring to Figure 3 As shown, the air cooling assembly 12 comprises a condenser 120 and a fan 121 for cooling the condenser, one end of the condenser is provided with a first proportional valve 122, the first proportional valve is used for controlling whether the cooling medium enters the air cooling assembly, the fan is arranged above the condenser in the air suction mode, and the heat exchange area of the condenser is 53.46 square meters.

[0040] Referring to Figure 4 As shown, the electric heating assembly 13 comprises a water tank 130, a coil type evaporator 131 is arranged in the water tank 130, one end of the coil type evaporator 131 is connected with the liquid return main pipe 21, the other end of the coil type evaporator 131 is connected with one inlet of the four-way valve 11, an electric heater 132 is further arranged in the water tank 130, the electric heater 132 is located at the center of the coil type evaporator, one end of the coil type evaporator 132 is provided with a second proportional valve 133, the direct cooling technology is used in the utility model, in the heating working condition, the environment is in the low temperature or even the extreme low temperature, at the moment, the heating is realized through the direct cooling assembly through the switching of the four-way valve, if the conventional method is used at the moment, the condenser of the unit is used as the evaporator, no matter in the low-temperature environment or in the high-humidity environment, the unit needs to be continuously adjusted and dehumidified due to the poor heat dissipation of the condenser, so that the unit cannot continuously work, therefore, in the heating working condition, the evaporator is switched to the electric heating assembly, so that the heating work in the low-temperature environment is smoothly realized.

[0041] In conclusion, the utility model has the following beneficial effects:

[0042] The utility model discloses a kind of energy storage device direct-cooling thermal management systems, by setting electronic expansion valve to the backflow end of direct-cooling plate to accurately control the flow of cooling medium in direct-cooling plate, to ensure the uniformity of the temperature of each direct-cooling plate group, so that the temperature of each direct-cooling plate group corresponding battery can also be uniformly controlled, further, the flow in direct-cooling plate is designed, ensure that the flow of heat exchange medium of the upper and lower two parts of direct-cooling plate is same, ensure the uniformity of the heat exchange of direct-cooling plate.

[0043] Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

Claims

1. An energy storage device direct cooling thermal management system comprising a direct cooling system and a direct cooling assembly to cool a battery cluster, characterized by: The direct cooling assembly comprises a liquid inlet main pipe and a liquid return main pipe, and a plurality of direct cooling plate groups are arranged between the liquid inlet main pipe and the liquid return main pipe.

2. A direct cooling thermal management system for an energy storage device according to claim 1, wherein: The direct cooling plate comprises a plate body which is rectangular, a liquid inlet port is arranged at the right end of the upper end of the plate body, a first direct cooling pipe is arranged in the plate body and communicates with the liquid inlet port, the length of the first direct cooling pipe is half of the width of the plate body, a second direct cooling pipe which is centrally symmetrical to the first direct cooling pipe is arranged at the left side of the lower end of the plate body, a liquid outlet port is arranged at the right end of the lower end of the plate body, the lower end of the second direct cooling pipe extends to the right end of the plate body along the lower end of the plate body and communicates with the liquid outlet port, a first coil pipe is arranged between the upper part of the first direct cooling pipe and the upper part of the second direct cooling pipe, a second coil pipe is arranged between the lower part of the first direct cooling pipe and the lower part of the second direct cooling pipe, and the lengths of the first coil pipe and the second coil pipe are the same.

3. A thermal management system for energy storage devices direct cooling according to claim 2, characterized in that: The first coil pipe and the second coil pipe are S-shaped coil pipes arranged along the length direction of the plate body.

4. The direct cooling thermal management system for energy storage devices of claim 1, wherein: The direct cooling system comprises a compressor, a four-way valve, a wind cooling assembly and an electric heating assembly, the wind cooling assembly and the electric heating assembly are arranged in parallel, one end of the wind cooling assembly and the electric heating assembly is connected with the liquid return main pipe, the other end of the wind cooling assembly and the electric heating assembly is connected with one inlet of the four-way valve, one outlet of the four-way valve is connected with the liquid inlet main pipe, one end of the compressor is connected with the other inlet of the four-way valve, and the other outlet of the four-way valve is connected with the other end of the compressor.

5. A thermal management system for energy storage devices direct cooling according to claim 4, characterized in that: The wind cooling assembly comprises a condenser and a fan for cooling the condenser, and one end of the condenser is provided with a first proportional valve.

6. A thermal management system for energy storage devices direct cooling according to claim 4, characterized in that: The electric heating assembly comprises a water tank, a coil pipe evaporator is arranged in the water tank, one end of the coil pipe evaporator is connected with the liquid return main pipe, the other end of the coil pipe evaporator is connected with one inlet of the four-way valve, an electric heater is further arranged in the water tank, the electric heater is arranged at the center of the coil pipe evaporator, and one end of the coil pipe evaporator is provided with a second proportional valve.

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