Energy storage system

Abstract

The utility model provides an energy storage system. The energy storage system comprises a battery cluster and at least one energy storage converter which are connected with each other, the battery cluster at least comprises a battery pack; each battery pack is internally provided with a cold liquid sub-flow channel located on the liquid cooling plate, and each cold liquid sub-flow channel enables cold liquid to circulate in each battery pack. According to the energy storage system provided by the embodiment of the utility model, on the basis of the prior art, a liquid cooling temperature adjusting device is removed, so that the cold liquid in the energy storage system is only internally circulated, the energy consumption of the system is reduced, the design complexity is reduced, the cost of the energy storage system is reduced, the installation cost is reduced, and troubleshooting and maintenance are facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrochemistry energy storage technical field, specifically, relate to a kind of energy storage system. BACKGROUND

[0002] The currently common electrochemical energy storage system usually includes: PCS (Power Conversion System, energy storage converter) and battery cluster composed of PACK (battery pack). Wherein, PCS is the core equipment of energy storage system, responsible for the bidirectional energy conversion between direct current (battery side) and alternating current (power grid side). Battery cluster is the battery pack composed of multiple battery modules in series or parallel, responsible for storing and releasing electric energy. In energy storage all-in-one machine, PCS and battery cluster are connected by high-voltage box, to form a complete energy storage system.

[0003] In order to guarantee the performance and life of battery pack, high-efficiency heat dissipation device needs to be set outside the energy storage system, such as liquid cooling air conditioner and flow channel connected with liquid cooling air conditioner. Specifically, cold liquid flow channel is arranged in each battery pack respectively, and the cold liquid flow channel in each battery pack is connected in parallel with the flow channel connected with liquid cooling air conditioner. However, this scheme has great installation difficulty, difficult troubleshooting, cooling liquid leakage risk, high maintenance cost, relatively high energy consumption, and limited environmental adaptability due to the influence of environmental temperature and humidity on the performance of cooling liquid. UTILITY MODEL CONTENT

[0004] In order to solve the above problems, the purpose of the embodiment of the utility model is to provide an energy storage system.

[0005] The embodiment of the utility model provides an energy storage system, battery cluster and at least one energy storage converter connected with each other; the battery cluster at least includes one battery pack; each battery pack has cold liquid sub-flow channel arranged on liquid cooling plate inside; each cold liquid sub-flow channel can realize circulation of cold liquid inside each battery pack.

[0006] Optionally, each cold liquid sub-flow channel includes inlet and outlet.

[0007] Optionally, the inlet and outlet of each cold liquid sub-flow channel are communicated through communication pipeline, and each cold liquid sub-flow channel forms closed loop circuit.

[0008] Optionally, battery cluster includes multiple battery packs; the outlet of each cold liquid sub-flow channel and the inlet of next cold liquid sub-flow channel are connected in sequence through communication pipeline, and multiple cold liquid sub-flow channels are connected in series to form closed loop circuit.

[0009] Optionally, the energy storage system further includes water pump, and the water pump is arranged on the cold liquid sub-flow channel, or the water pump is arranged on the communication pipeline.

[0010] Optionally, the energy storage system further comprises: an air-cooled temperature regulating device, an air outlet of the air-cooled temperature regulating device is connected to an air inlet of the battery cluster, and an air inlet of the air-cooled temperature regulating device is connected to an air outlet of the battery cluster; the air outlet of the air-cooled temperature regulating device sends air to the air inlet of the battery cluster, and the air outlet of the battery cluster discharges air to the air inlet of the air-cooled temperature regulating device.

[0011] Optionally, the energy storage system further comprises: a fan for accelerating the flow of air in the battery cluster.

[0012] Optionally, the energy storage system further comprises: a temperature regulating device for cooling the energy storage converter.

[0013] In the above-mentioned scheme provided by the embodiments of the present application, the liquid-cooled temperature regulating device is removed on the basis of the prior art, so that the cold liquid in the energy storage system is only in internal circulation, thereby reducing system energy consumption, reducing design complexity, reducing the cost of the energy storage system, reducing installation cost, facilitating troubleshooting and maintenance.

[0014] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0016] Figure 1 Fig. 1 shows a first structural schematic diagram of an energy storage system provided by an embodiment of the present application;

[0017] Figure 2 Fig. 2 shows a second structural schematic diagram of an energy storage system provided by an embodiment of the present application;

[0018] Figure 3 Fig. 3 shows a third structural schematic diagram of an energy storage system provided by an embodiment of the present application.

[0019] FIGURE:

[0020] 1-battery cluster, 2-energy storage converter, 3-cold liquid sub-flow channel, 4-water pump, 5-air cooling temperature adjusting device, 11-battery pack, 31-liquid inlet, 32-liquid outlet, 33-communication pipeline, 51-air outlet, 52-air inlet, A-battery compartment, a-air inlet of the battery compartment, b-air outlet of the battery compartment. DETAILED DESCRIPTION

[0021] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0022] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0023] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] The present application provides a kind of energy storage system, as shown in Figure 1 , as shown in Figure 1 The first structure example of the energy storage system is shown.The energy storage system includes: battery cluster 1 and at least one energy storage converter 2 (i.e.PCS), which are connected to each other, it can be understood that battery cluster 1 and energy storage converter 2 are connected by DC bus (DC Bus), for simple indication, the DC bus is not emphasized and shown in the present application and drawings.The battery cluster 1 in the embodiment of the present application at least includes one battery pack 11 (i.e.PACK), as shown in Figure 1 , the battery cluster 1 includes three battery packs 11, it should be noted that the battery cluster 1 as a whole can be located in the battery compartment (Figure 1 The number of battery clusters 1 and the positional relationship between the battery clusters 1 and the energy storage converter 2 are not specifically limited in this embodiment, for example, the number of battery clusters 1 can be one or multiple, and the positional relationship between the battery clusters 1 and the energy storage converter 2 can be as shown in Figure 1 The upper and lower connections as shown, or the left and right settings, etc.

[0025] In the embodiment of the utility model, each battery pack 11 has a liquid cooling plate (not directly shown in the figure for simple illustration), for example, a battery module composed of a combination of battery cells can be arranged on the liquid cooling plate to encapsulate and form the battery pack 11. Further, a cold liquid sub-flow channel 3 is arranged on the surface of the liquid cooling plate. As the name implies, the cold liquid sub-flow channel 3 is a channel (or pipeline) for carrying and circulating cold liquid, which can specifically include water, ethylene glycol, silicone oil, etc. The embodiment does not specifically limit this. Based on the cold liquid sub-flow channel 3 carried and arranged on the liquid cooling plate inside each battery pack 11, the cold liquid can circulate and circulate inside each battery pack 11, so that additional liquid cooling temperature adjustment equipment (such as a liquid cooling air conditioner, a water-air heat exchanger) does not need to be added, and each battery pack 11 (i.e. the entire battery cluster) can also be cooled. Moreover, the liquid cooling plate itself can also play a heat exchange role, because its total area is large, the cold liquid can circulate in the cold liquid sub-flow channel 3 inside it, and the liquid cooling plate can absorb and transfer the heat of the battery cells to the cold liquid in the liquid cooling plate, and transfer the heat as the cold liquid flows in the cold liquid sub-flow channel 3. It can be understood that the liquid cooling plate itself is heated by absorbing the heat released by the battery cells, and then further exchanges heat through the liquid cooling plate, the shell of the battery pack 11 and the air in the battery compartment, so that the air inside the battery pack 11 exchanges heat with the air in the external environment, and the heat is transferred to the external environment. In addition, because the liquid cooling temperature adjustment equipment is removed, the embodiment of the utility model can reduce system energy consumption, reduce design complexity, reduce energy storage system cost, reduce installation cost, and also facilitate fault diagnosis and maintenance.

[0026] It should be noted that the commonly used metals for liquid cooling plates (including cold liquid sub-flow channels 3) are copper, aluminum and their alloys, which have different characteristics in terms of thermal conductivity, corrosion resistance and cost. The material selection of the liquid cooling plate is not specifically limited in this embodiment. For example, because the liquid cooling plate can conduct heat from the heat source to the cold liquid, a liquid cooling plate material with a high thermal conductivity will increase the heat conduction speed and improve the heat dissipation effect. The liquid cooling plate can be made of a material with a high thermal conductivity. In addition, the specific heat capacity of the liquid cooling plate material will also affect the heat dissipation efficiency. A material with a large specific heat capacity can absorb more heat, which helps to maintain stable heat dissipation performance. The liquid cooling plate can also be made of a material that has a large specific heat capacity.

[0027] Optionally, as shown in Figure 1 and Figure 2As shown in the structure, each cold liquid sub-flow channel 3 includes an inlet 31 and an outlet 32. Figure 1 As shown in the structure, the inlet 31 and the outlet 32 of each cold liquid sub-flow channel 3 are connected by a communication pipeline 33, so that each cold liquid sub-flow channel 3 forms an independent closed loop, and the cold liquid can form an internal circulation in each battery pack 11, thereby achieving effective cooling. It can be understood that the communication pipeline 33 can also be externally connected to a cold liquid delivery pipeline to deliver the cold liquid to the cold liquid sub-flow channel 3 inside the battery pack 11.

[0028] Optionally, as shown in the structure, Figure 2 The battery cluster 1 includes a plurality of battery packs 11; the outlet 32 of each cold liquid sub-flow channel 3 is sequentially connected to the inlet 31 of the next cold liquid sub-flow channel 3 through the communication pipeline 33, so that the outlet 32 of the cold liquid sub-flow channel 3 of the last battery pack 11 is connected to the inlet 31 of the cold liquid sub-flow channel 3 of the first battery pack 11, and the plurality of cold liquid sub-flow channels 3 are sequentially connected in series to form a closed loop in the entire battery cluster 1.

[0029] Optionally, as shown in the structure, Figure 1 and Figure 2 Optionally, as shown in the structure, Figure 1 The number of water pumps 4 can correspond to the number of battery packs 11, that is, each water pump 4 is arranged on the cold liquid sub-flow channel 3 of each battery pack 11, such as being arranged in each battery pack 11, or each water pump 4 can be arranged on the communication pipeline 33 externally connected to the cold liquid sub-flow channel 3 of each battery pack 11. For the structure shown in Figure 2 The number of water pumps 4 can be one or more, that is, the water pump 4 can be arranged on the communication pipeline 33 outside the entire battery cluster 1.

[0030] Optionally, as shown in the structure, Figure 3 The energy storage system further includes an air-cooled temperature adjusting device 5 (such as a fan), and the outlet 51 of the air-cooled temperature adjusting device 5 is connected to the inlet of the battery cluster 1, and the inlet 52 of the air-cooled temperature adjusting device 5 is connected to the outlet of the battery cluster 1. It can be understood that the inlet of the battery cluster 1 is the inlet of the battery compartment (shown by reference numeral A in Figure 3 The outlet of the battery cluster 1 is the outlet of the battery compartment (shown by reference numeral a in Figure 3 The outlet of the battery cluster 1 is the outlet of the battery compartment (shown by reference numeral a in Figure 3The air outlet 51 of the air-cooled temperature regulating device 5 can deliver air to the air inlet of the battery cluster 1, for example, in the case of needing to lower the temperature, the air outlet 51 of the air-cooled temperature regulating device 5 can deliver cold air to the air inlet of the battery cluster 1, or in the case of needing to raise the temperature, the air outlet 51 of the air-cooled temperature regulating device 5 can also deliver hot air to the air inlet of the battery cluster 1. The air outlet of the battery cluster 1 can exhaust air to the air inlet 52 of the air-cooled temperature regulating device 5, for example, in the case of needing to lower the temperature, the air outlet of the battery cluster 1 can exhaust hot air to the air inlet 52 of the air-cooled temperature regulating device 5, so that the cold air output by the air-cooled temperature regulating device 5 can effectively regulate the temperature in the battery cluster 1. It should be noted that the present application does not specifically limit the setting position of the air outlet 51 and the air inlet 52 of the air-cooled temperature regulating device 5, which can be adapted to the air inlet and air outlet of the battery cluster 1 according to actual design requirements.

[0031] Optionally, the energy storage system can further include a fan for accelerating the flow of air in the battery cluster 1. Specifically, the fan can be located in the battery compartment, thereby helping to dissipate heat and balance the temperature in the battery compartment, and prolonging the battery life. It should be noted that the position of the fan can be evenly distributed in the battery compartment, such as the upper part, the middle part, the lower part and the left and right sides, thereby further accelerating the flow of air in the battery cluster 1. The present application does not limit the specific placement position of the fan.

[0032] Optionally, the energy storage system further includes a temperature regulating device for cooling the energy storage converter 2. For example, the temperature regulating device can be an external liquid-cooled air conditioner, and a converter flow channel is arranged in the energy storage converter 2, and the converter flow channel is at least in communication with the flow channel of the liquid-cooled air conditioner, so as to regulate the temperature of the energy storage converter 2 by the refrigeration and heating of the liquid-cooled air conditioner. Alternatively, the temperature regulating device can be an external heat exchanger, an air-cooled air conditioner, a fan, etc., and the energy storage converter 2 is individually regulated by the above-mentioned temperature regulating device.

[0033] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of changes or alternative technical solutions within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An energy storage system, characterized by, The application relates to a battery cluster (1) and at least one energy storage converter (2) connected to each other; the battery cluster (1) comprises at least one battery pack (11). Each battery pack (11) has a cold liquid sub-flow channel (3) arranged on a liquid cooling plate inside the battery pack (11), and each cold liquid sub-flow channel (3) can realize circulation of cold liquid inside each battery pack (11). Each cold liquid sub-flow channel (3) comprises an inlet (31) and an outlet (32).

2. The energy storage system of claim 1, wherein, The inlet (31) and the outlet (32) of each cold liquid sub-flow channel (3) are connected through a communication pipeline (33), and each cold liquid sub-flow channel (3) forms a closed loop.

3. The energy storage system of claim 2, wherein, The battery cluster (1) comprises a plurality of battery packs (11); the outlet (32) of each cold liquid sub-flow channel (3) is sequentially connected to the inlet (31) of the next cold liquid sub-flow channel (3) through a communication pipeline (33), and a plurality of cold liquid sub-flow channels (3) are connected in series to form a closed loop.

4. The energy storage system of claim 2, wherein, The application further comprises:

5. The energy storage system of any one of claims 1-4, wherein, A water pump (4) arranged on the cold liquid sub-flow channel (3) or the communication pipeline (33). The application further comprises:

6. The energy storage system of any one of claims 1 to 4, wherein, An air-cooled temperature regulating device (5); an air outlet (51) of the air-cooled temperature regulating device (5) is connected to an air inlet of the battery cluster (1), and an air inlet (52) of the air-cooled temperature regulating device (5) is connected to an air outlet of the battery cluster (1); the air outlet (51) of the air-cooled temperature regulating device (5) sends air to the air inlet of the battery cluster (1), and the air outlet of the battery cluster (1) discharges air to the air inlet (52) of the air-cooled temperature regulating device (5). The application further comprises:

7. The energy storage system of claim 6, wherein, A fan for accelerating the flow of air in the battery cluster (1). The application further comprises:

8. The energy storage system of claim 1, wherein, A temperature regulating device for cooling the energy storage converter (2). ​

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