Heat management device of energy storage system and energy storage system

Abstract

The utility model relates to the technical field of energy storage system thermal management, in particular to an energy storage system thermal management device and an energy storage system.The energy storage system thermal management device comprises a liquid cooling unit and a plurality of cluster-level liquid cooling units, the liquid cooling unit comprises a condenser and a compressor, and the cluster-level liquid cooling units are connected in parallel. The cluster-level liquid cooling unit comprises a heat exchanger unit, a pump unit and a liquid cooling plate, the liquid cooling plate, the pump unit and the heat exchanger unit are connected in series, the liquid cooling plate is used for cooling a battery pack, the pump unit is used for circulation of a liquid cooling medium in the liquid cooling plate, and the heat exchanger unit is used for cooling the liquid cooling medium. The heat exchanger unit is connected with the condenser and the compressor in series, and the condenser and the compressor are used for cooling refrigerants. According to the utility model, the occupied space of the liquid cooling unit is reduced, and cluster-level heat management is realized.

Description

Technical Field

[0001] This utility model relates to the field of thermal management technology for energy storage systems, specifically to a thermal management device and an energy storage system for energy storage systems. Background Technology

[0002] like Figure 4 As shown, most mainstream manufacturers currently use liquid cooling systems for their energy storage systems. Their thermal management devices include liquid cooling units, battery compartment liquid cooling pipes, and battery pack liquid cooling plates. When the energy storage system is charging and discharging, the heat emitted by the cells is absorbed by the coolant. The coolant passes through the battery pack liquid cooling plates, liquid cooling pipes, and liquid cooling units, and finally releases the heat to the outside.

[0003] Liquid cooling units include structures such as condensers, compressors, plate heat exchangers, and circulating pumps. The plate heat exchangers and circulating pumps are relatively large and take up a lot of space in container layout. In addition, the liquid cooling unit is a liquid cooling system at the battery system level. Once the circulating pump of the liquid cooling unit starts, the coolant will flow in the liquid cooling plates of all battery packs in the battery compartment, and it is not possible to implement temperature control strategies for individual battery clusters. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a thermal management device and energy storage system for an energy storage system, which reduces the space occupied by the liquid cooling unit and achieves cluster-level thermal management.

[0005] To address the aforementioned technical problems, in a first aspect, this utility model provides a thermal management device for an energy storage system, comprising a liquid-cooled unit and multiple cluster-level liquid-cooled units. The liquid-cooled unit includes a condenser and a compressor. The multiple cluster-level liquid-cooled units are connected in parallel. Each cluster-level liquid-cooled unit includes a heat exchanger unit, a pump unit, and a liquid-cooled plate. The liquid-cooled plate, pump unit, and heat exchanger unit are connected in series. The liquid-cooled plate is used to cool the battery pack. The pump unit is used to circulate the liquid cooling medium in the liquid-cooled plate. The heat exchanger unit is used to cool the liquid cooling medium. The heat exchanger unit is connected in series with the condenser and the compressor. The condenser and the compressor are used to cool the refrigerant.

[0006] In some embodiments, a first evaporator is included, which is connected in series with the condenser and the compressor, and the first evaporator is used to cool the electrical compartment.

[0007] In some embodiments, a second evaporator is included, which is connected in series with the condenser and the compressor, and the second evaporator is used to cool the battery compartment.

[0008] Secondly, this utility model provides an energy storage system, including a housing, a battery compartment and an electrical compartment are provided inside the housing, and the liquid cooling unit is arranged in the electrical compartment near the end of the housing.

[0009] In some embodiments, the battery compartment is provided with multiple battery clusters, which are evenly arranged along the length of the housing.

[0010] In some embodiments, the battery compartment includes a front battery compartment and a rear battery compartment, the battery cluster is arranged in the rear battery compartment, the heat exchanger unit and the pump unit are arranged in the front battery compartment, and the refrigerant pipe connecting the liquid cooling unit to the heat exchanger unit is arranged close to the wall of the front battery compartment.

[0011] Furthermore, the heat exchanger unit and the pump unit are arranged in a one-to-one correspondence with the battery cluster, and a second evaporator is provided between two adjacent heat exchanger units. The second evaporator is used to cool the battery compartment.

[0012] Furthermore, the second evaporator is connected to the liquid cooling unit via the refrigerant pipeline.

[0013] In some embodiments, a fire cabinet is provided in the electrical compartment, and the fire cabinet is located at the end of the electrical compartment near the box body.

[0014] Furthermore, the liquid cooling unit is arranged above the fire cabinet.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. Compared with the prior art, this utility model separates the large-scale plate heat exchanger and circulating pump from the liquid cooling unit, while retaining the condenser and compressor for external heat dissipation, thereby reducing the volume of the liquid cooling unit and making higher use of the internal space; each battery cluster is equipped with an independent cluster-level liquid cooling unit, which includes a small heat exchanger, circulating pump, inlet and outlet valves, etc. The circulating pumps of different cluster-level liquid cooling units are independent of each other, and cluster-level thermal management can be achieved by controlling the speed at which the coolant in the cluster flows into the liquid cooling plate of the battery pack.

[0017] 2. By setting up a first evaporator, which is connected to a liquid cooling unit, the present invention can dissipate heat from the electrical compartment, allowing the battery compartment and the electrical compartment to share a single liquid cooling unit, thus saving space.

[0018] 3. This utility model can dissipate heat from the battery compartment by setting up a second evaporator, which is connected to the liquid cooling unit.

[0019] 4. This utility model further improves the space utilization rate inside the box by rationally arranging the positions of the liquid cooling unit, fire cabinet, battery cluster, and cluster-level liquid cooling unit. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the thermal management device of this utility model;

[0021] Figure 2 This is a schematic diagram of the container structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the internal structure of the container of this utility model;

[0023] Figure 4 This is a schematic diagram of the structure of a thermal management device in the prior art.

[0024] Figure label:

[0025] 1-Liquid cooling unit; 11-Condenser; 12-Compressor; 2-Cluster-level liquid cooling unit; 21-Heat exchanger unit; 22-Pump unit; 23-Liquid cooling plate; 3-First evaporator; 4-Second evaporator; 5-Casing; 6-Fire cabinet; 7-Battery cluster; 8-Refrigerant piping; 9-Distribution cabinet; 10-Combiner cabinet. Detailed Implementation

[0026] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0027] like Figure 1 As shown, this utility model provides a thermal management device for an energy storage system, including a liquid cooling unit 1 and multiple cluster-level liquid cooling units 2. The liquid cooling unit 1 includes a condenser 11 and a compressor 12. The multiple cluster-level liquid cooling units 2 are connected in parallel. Each cluster-level liquid cooling unit 2 includes a heat exchanger unit 21, a pump unit 22, and a liquid cooling plate 23. The liquid cooling plate 23, the pump unit 22, and the heat exchanger unit 21 are connected in series. The liquid cooling plate 23 is used to cool the battery pack. The pump unit 22 is used to circulate the liquid cooling medium in the liquid cooling plate 23. The heat exchanger unit 21 is used to cool the liquid cooling medium. The heat exchanger unit 21 is connected in series with the condenser 11 and the compressor 12. The condenser 11 and the compressor 12 are used to cool the refrigerant.

[0028] Understandably, since the heat exchanger unit 21 is connected in series with the condenser 11 and the compressor 12, the condenser 11 and the compressor 12 can cool the refrigerant in the heat exchanger unit 21. The cooled refrigerant can exchange heat with the liquid cooling medium in the liquid cooling plate 23, so that the liquid cooling medium in the liquid cooling plate 23 always maintains a low temperature. The pump unit 22 can ensure the circulation of the liquid cooling medium in the multiple liquid cooling plates 23 in a battery cluster 7, and ensure the uniformity of the temperature of each cell in a battery cluster 7.

[0029] Compared with the prior art, this utility model eliminates the plate heat exchanger and circulation pump in the liquid cooling unit 1, and configures a separate heat exchanger unit 21 and pump unit 22 for each battery cluster 7. Since the heat exchanger unit 21 and pump unit 22 are only responsible for the heat dissipation of one battery cluster 7, the heat exchanger unit 21 and pump unit 22 can use smaller heat exchangers, circulation pumps and corresponding valves, reducing the volume of the liquid cooling unit 1 and making higher use of the space inside the housing 5; and the circulation pumps of different cluster-level liquid cooling units 2 are independent of each other, and cluster-level thermal management can be achieved by controlling the speed at which the coolant in the cluster flows into the battery pack liquid cooling plate 23.

[0030] In some embodiments, as Figure 1 As shown, the thermal management device of the energy storage system includes a first evaporator 3, which is connected in series with a condenser 11 and a compressor 12. The first evaporator 3 is used to cool the electrical compartment.

[0031] like Figure 4 As shown, typically, the liquid cooling unit 1 only dissipates heat from the battery compartment, while the electrical compartment is cooled by either natural cooling with a fan or by air cooling with an industrial air conditioner, depending on the operating environment. In this invention, the first evaporator 3 is connected to the liquid cooling unit 1, which can also dissipate heat from the electrical compartment, allowing the battery compartment and electrical compartment to share a single liquid cooling unit 1, thus saving space.

[0032] In some embodiments, as Figure 1 As shown, the thermal management device of the energy storage system includes a second evaporator 4, which is connected in series with the condenser 11 and the compressor 12. The second evaporator 4 is used to cool the battery compartment.

[0033] Secondly, such as Figure 2 As shown, this utility model provides an energy storage system, including a housing 5, with a battery compartment and an electrical compartment inside the housing 5. The electrical compartment is on the left and the battery compartment is on the right. A liquid cooling unit 1 is arranged at the end of the electrical compartment near the housing 5.

[0034] Understandably, the liquid cooling unit 1 is located on the left end face of the housing 5 to facilitate large-area contact with the air for heat dissipation.

[0035] In some embodiments, a plurality of battery clusters 7 are provided in the battery compartment, and the battery clusters 7 are evenly arranged along the length of the housing 5.

[0036] In some embodiments, as Figure 3 As shown, the battery compartment includes a front battery compartment and a rear battery compartment. The battery cluster 7 is arranged in the rear battery compartment, the heat exchanger unit 21 and the pump unit 22 are arranged in the front battery compartment, and the refrigerant pipe 8 connecting the liquid cooling unit 1 and the heat exchanger unit 21 is arranged close to the wall of the front battery compartment.

[0037] It should be noted that the front and rear battery compartments are only for illustrative purposes; they are not separated by any structure.

[0038] Furthermore, the heat exchanger unit 21 and the pump unit 22 are arranged in a one-to-one correspondence with the battery cluster 7, and a second evaporator 4 is provided between two adjacent heat exchanger units 21. The second evaporator 4 is used to cool the battery compartment.

[0039] Furthermore, the second evaporator 4 is connected to the liquid-cooled unit 1 via the refrigerant pipe 8.

[0040] In some embodiments, a fire cabinet 6 is provided in the electrical compartment, and the fire cabinet 6 is arranged at the end of the electrical compartment near the box 5.

[0041] Furthermore, the liquid cooling unit 1 is positioned above the fire cabinet 6. The electrical compartment also houses a distribution cabinet 9 and a junction box 10, with the distribution cabinet 9 positioned above the junction box 10.

[0042] The thermal management principle of this energy storage system:

[0043] When there is a large temperature difference between battery clusters 7, the temperature can be adjusted by controlling the cluster-level temperature control strategy. This involves reducing the speed of the circulation pump in the lower-temperature battery cluster 7 and increasing the speed of the circulation pump in the higher-temperature battery cluster 7 to ensure uniform temperature across multiple battery clusters 7. When the ambient temperature inside the electrical compartment and battery compartment is <35℃, the thermal management unit does not operate, meaning the first evaporator 3 and the second evaporator 4 are not turned on. When the ambient temperature inside the compartment is between 35℃ and 40℃, only the first evaporator 3 and the second evaporator 4 are activated for internal circulation cooling. When the ambient temperature inside the compartment is ≥40℃, the valve on the refrigerant pipe 8 connecting the liquid cooling unit 1 to the first evaporator 3 and the second evaporator 4 is opened to remove heat from the compartment.

[0044] This utility model further improves the space utilization rate inside the cabinet 5 by rationally arranging the positions of the liquid cooling unit 1, fire cabinet 6, battery cluster 7, and cluster-level liquid cooling unit 2.

[0045] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A thermal management device for an energy storage system, characterized in that: The system includes a liquid cooling unit (1) and multiple cluster-level liquid cooling units (2). The liquid cooling unit (1) includes a condenser (11) and a compressor (12). The multiple cluster-level liquid cooling units (2) are connected in parallel. Each cluster-level liquid cooling unit (2) includes a heat exchanger unit (21), a pump unit (22), and a liquid cooling plate (23). The liquid cooling plate (23), the pump unit (22), and the heat exchanger unit (21) are connected in series. The liquid cooling plate (23) is used to cool the battery pack. The pump unit (22) is used to circulate the liquid cooling medium in the liquid cooling plate (23). The heat exchanger unit (21) is used to cool the liquid cooling medium. The heat exchanger unit (21) is connected in series with the condenser (11) and the compressor (12). The condenser (11) and the compressor (12) are used to cool the refrigerant.

2. The thermal management device for an energy storage system according to claim 1, characterized in that: It includes a first evaporator (3), which is connected in series with the condenser (11) and the compressor (12), and the first evaporator (3) is used to cool the electrical compartment.

3. The thermal management device for an energy storage system according to claim 1 or 2, characterized in that: It includes a second evaporator (4), which is connected in series with the condenser (11) and the compressor (12), and the second evaporator (4) is used to cool the battery compartment.

4. An energy storage system with a thermal management device for an energy storage system according to any one of claims 1 to 3, characterized in that: Includes a housing (5), inside which a battery compartment and an electrical compartment are provided, and the liquid cooling unit (1) is arranged in the electrical compartment at the end near the end of the housing (5).

5. The energy storage system according to claim 4, characterized in that: Multiple battery clusters (7) are arranged inside the battery compartment, and the battery clusters (7) are evenly arranged along the length of the box (5).

6. The energy storage system according to claim 5, characterized in that: The battery compartment includes a front battery compartment and a rear battery compartment. The battery cluster (7) is arranged in the rear battery compartment. The heat exchanger unit (21) and the pump unit (22) are arranged in the front battery compartment. The refrigerant pipe (8) connecting the liquid cooling unit (1) and the heat exchanger unit (21) is arranged close to the wall of the front battery compartment.

7. The energy storage system according to claim 6, characterized in that: The heat exchanger unit (21) and the pump unit (22) are arranged in a one-to-one correspondence with the battery cluster (7). A second evaporator (4) is provided between two adjacent heat exchanger units (21) for cooling the battery compartment.

8. The energy storage system according to claim 7, characterized in that: The second evaporator (4) is connected to the liquid cooling unit (1) through the refrigerant pipe (8).

9. The energy storage system according to claim 4, characterized in that: A fire cabinet (6) is installed in the electrical compartment, and the fire cabinet (6) is located at the end of the electrical compartment near the box body (5).

10. The energy storage system according to claim 9, characterized in that: The liquid cooling unit (1) is arranged above the fire cabinet (6).

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