Battery liquid cooling energy storage system

Abstract

The utility model relates to the technical field of lithium battery energy storage, in particular to a battery liquid cooling energy storage system. The device comprises a plurality of energy storage units which are electrically connected in series and installed in an energy storage cabinet, each energy storage unit comprises a box body and a battery module which is installed in an inner cavity of the box body in a sealed mode, liquid cooling assemblies which are arranged around the periphery of the battery module are installed on the box body, and connector pipes are installed at the two ends of the box body. A liquid inlet and a liquid outlet of the liquid cooling assembly are respectively formed by the joint pipes, and the liquid inlet and the liquid outlet are connected to a cooling liquid circulating mechanism of the energy storage cabinet; and the end part of the box body is also provided with a connector assembly for electrically connecting the battery module with the energy storage cabinet. The battery cooling device is reasonable in structural layout, and has better cooling effect and cooling uniformity on batteries.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery energy storage technology field, and specifically is a battery liquid cooling energy storage system. BACKGROUND

[0002] With the development of lithium battery technology, the energy storage industry also uses lithium batteries for energy storage. The working temperature of lithium batteries is a key factor affecting their service life and cycle number. Therefore, a heat dissipation structure for battery heat dissipation is provided in the energy storage cabinet.

[0003] The air-cooled heat dissipation structure is one of the commonly used heat dissipation structures of the energy storage cabinet. Its structure is mainly as recorded in the text of Chinese patent application No. 202211020075.7 entitled Energy Storage Cabinet. By optimizing the air guide duct piece, the energy storage cabinet is simplified and the heat dissipation is more sufficient. Since air-cooled heat dissipation relies on air heat exchange, the heat dissipation efficiency is low. Some energy storage cabinets with higher heat dissipation efficiency requirements use liquid-cooled heat dissipation structures, such as the text of Chinese patent application No. 202223306555.8 entitled Liquid-cooled Energy Storage Battery Cabinet. The joint pipe is arranged around the cabinet body to dissipate heat from the energy storage batteries in the cabinet body. However, in actual implementation, the liquid cooling structure installed on the energy storage cabinet has a small contact area between most of the batteries and the liquid cooling structure due to installation conditions and installation space problems, which results in poor cooling effect and insufficient uniformity. Therefore, it is urgent to solve this problem. SUMMARY

[0004] In order to avoid and overcome the technical problems existing in the prior art, the utility model provides a battery liquid cooling energy storage system, which has a reasonable structure layout and good cooling effect and cooling uniformity for the battery.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] A battery liquid cooling energy storage system includes a plurality of energy storage units installed in series in an energy storage cabinet. The energy storage unit includes a box body and a battery module sealedly installed in the inner cavity of the box body. The box body is provided with a liquid cooling assembly arranged around the outer periphery of the battery module. The two ends of the box body are provided with joint pipes, which form the liquid inlet and liquid outlet of the liquid cooling assembly, respectively. The liquid inlet and liquid outlet are connected to the cooling liquid circulating mechanism of the energy storage cabinet. The end of the box body is also provided with a joint assembly for electrically connecting the battery module and the energy storage cabinet. This layout method eliminates the complex structure design of the energy storage cabinet in the past. The liquid cooling assembly is integrated in each energy storage unit. Only the frame structure suitable for the energy storage unit needs to be arranged on the energy storage cabinet.

[0007] As a further scheme of the utility model: the liquid cooling assembly includes side liquid cooling plates arranged in the inside of the two side plates of the box body and bottom liquid cooling plates arranged in the inside of the bottom plate of the box body, and the two ends of the side liquid cooling plates and the bottom liquid cooling plates are communicated with two joint pipes respectively; end liquid cooling plates are installed at the two ends of the inner cavity of the box body, the two end liquid cooling plates are connected with each other, and the two end liquid cooling plates are communicated with the two joint pipes respectively; the inner walls of the side liquid cooling plates, the bottom liquid cooling plates and the end liquid cooling plates are attached to the outer walls of the battery module. The side liquid cooling plates arranged in the inside of the two side plates of the box body and the bottom liquid cooling plates arranged in the inside of the bottom plate of the box body do not need to arrange liquid cooling plate structures in the box body, thereby reducing the occupied space of the energy storage unit.

[0008] As a further scheme of the utility model: the battery module includes a plurality of energy storage batteries arranged side by side along the length direction of the box body. In actual implementation, a suitable number of energy storage batteries can be arranged according to the structure of the inner cavity of the box body, so as to facilitate the modular production of the box body and the energy storage cabinet.

[0009] As a further scheme of the utility model: the top portions of the plurality of energy storage batteries are sequentially connected in series through high-voltage connecting pieces, and the joint assembly includes two electrode joints connected with the positive electrode and the negative electrode of the outer end energy storage battery respectively, so that the layout of the outside of the box body is more simple.

[0010] As a further scheme of the utility model: the joint assembly further includes a wire harness joint connecting the communication interface of the energy storage unit and the energy storage cabinet, so as to collect the information of the battery module by the energy storage cabinet.

[0011] As a further scheme of the utility model: the inner cavity of the energy storage cabinet is arranged with a plurality of storage cavities arranged in series along the vertical direction, the energy storage unit is independently arranged in the storage cavity, the liquid outlet pipeline and the liquid return pipeline of the cooling liquid circulating mechanism are vertically arranged on the two side walls of the energy storage cabinet and extend to the two ends of all the storage cavities, and the joint pipes at the two ends of the box body are connected to the liquid outlet pipeline and the liquid return pipeline respectively. Not only the layout of each energy storage unit is more simple, but also the liquid outlet pipeline and the liquid return pipeline of the cooling liquid circulating mechanism in the energy storage cabinet do not need to be complicatedly wired, so as to quickly connect the liquid cooling assembly in the box body and the cooling liquid circulating mechanism.

[0012] As a further scheme of the utility model: through holes are arranged between adjacent storage cavities, so as to arrange the through arrangement of series wires between adjacent energy storage units, thereby facilitating the series connection between adjacent energy storage units.

[0013] As a further scheme of the utility model: the side wall of the energy storage cabinet is vertically arranged with an integrated wiring harness, the integrated wiring harness extends to one end of all the storage cavities, and the wiring harness connectors of all the energy storage units are connected with the communication interface of the energy storage cabinet through the integrated wiring harness. The wiring between the wiring harness connectors and the communication interface is more simple and convenient for quick connection.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] 1. The utility model discloses a simple and complex energy storage cabinet structure design is abandoned in the past, utilizes the liquid cooling assembly that each energy storage unit is integrated with itself, only needs to arrange the frame structure of the applicable energy storage unit on the energy storage cabinet. Two joint pipes of the liquid cooling assembly inlet and the water removal port in the energy storage unit are arranged at both ends of the box body respectively, and simultaneously, the joint assembly for the electrical connection of the battery module and the energy storage cabinet is also arranged at the end of the box body, which is favorable for the layout of the circuit in the energy storage cabinet. Moreover, the liquid cooling assembly adopts the surrounding type liquid cooling structure surrounding the battery module, which significantly improves the battery heat exchange area and heat exchange efficiency; simultaneously, the liquid inlet and the liquid outlet in all the energy storage units are connected in parallel to the cooling liquid circulating mechanism of the energy storage system, and the battery module in each energy storage unit is sealedly arranged in the box body, so that each energy storage unit does not interfere with each other, the uniformity of the battery module cooling in each energy storage unit is ensured, and the advantages of better cooling effect and more uniform cooling are achieved.

[0016] 2. The side liquid cooling plate arranged in the inside of the two side plates of the box body and the bottom liquid cooling plate arranged in the inside of the bottom plate of the box body are arranged, without needing to additionally arrange the liquid cooling plate structure in the box body, so that the occupied space of the energy storage unit is reduced; simultaneously, the two side plates and the bottom plate of the box body also have the function of air heat exchange in the energy storage cabinet, so that the structures needing heat dissipation in the energy storage cabinet are heat dissipated.

[0017] 3. The inner cavity of the energy storage cabinet is arranged with a plurality of storage cavities arranged in the vertical direction in sequence, and the energy storage units are independently arranged in the storage cavities; the liquid outlet pipeline and the liquid return pipeline of the cooling liquid circulating mechanism are vertically arranged on the two side walls of the energy storage cabinet and extend to both ends of all the storage cavities, and the joint pipes at both ends of the box body are connected to the liquid outlet pipeline and the liquid return pipeline respectively. The arrangement mode not only makes the layout of each energy storage unit more simple, but also makes the liquid outlet pipeline and the liquid return pipeline of the cooling liquid circulating mechanism in the energy storage cabinet not need complicated wiring, and facilitates the quick connection between the liquid cooling assembly in the box body and the cooling liquid circulating mechanism.

[0018] 4. The side wall of the energy storage cabinet is vertically arranged with an integrated wiring harness, the integrated wiring harness extends to one end of all the storage cavities, and the wiring harness connectors of all the energy storage units are connected with the communication interface of the energy storage cabinet through the integrated wiring harness, so that the wiring between the wiring harness connectors and the communication interface is more simple and convenient for quick connection. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model.

[0020] Figure 2 It is a longitudinal explosion structural schematic diagram of the box cover of the utility model.

[0021] Figure 3 It is an internal structural schematic diagram of the utility model.

[0022] Figure 4 It is a structural schematic diagram of the battery module of the utility model.

[0023] Figure 5 It is a structure schematic diagram of the bottom plate of the utility model.

[0024] Figure 6 It is a structure schematic diagram of the side plate of the utility model.

[0025] In the figure: 10, box; 11, bottom liquid cooling plate; 12, side liquid cooling plate; 20, battery module; 21, high-pressure connecting piece; 30, electrode connector; 40, wire harness connector; 50, connector pipe; 60, end liquid cooling plate; 70, energy storage cabinet; 71, storage cavity; 72, integrated wire harness; 80, cooling liquid circulating mechanism; 81, liquid outlet pipeline; 82, liquid return pipeline. DETAILED DESCRIPTION

[0026] The technical scheme in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0027] For the convenience of understanding, the specific structure and working mode of the utility model are described further as follows with reference to the drawings:

[0028] The specific structure of the utility model refers to Figures 1-6As shown, the main structure thereof includes a plurality of energy storage units installed in series electrically in the energy storage cabinet 70. Among them, the energy storage unit includes a box body 10 and a battery module 20 sealed in the inner cavity of the box body 10, and the box body 10 is provided with a liquid cooling assembly arranged around the outer periphery of the battery module 20. The battery module 20 sealed in the box body 10 is liquid-cooled and heat-dissipated by the liquid cooling assembly. In addition, the box body 10 is provided with a joint pipe 50 at both ends, and the two joint pipes 50 respectively constitute the liquid inlet and liquid outlet of the liquid cooling assembly. The liquid inlet and liquid outlet are connected to the cooling liquid circulating mechanism 80 of the energy storage system for circulating cooling of the liquid cooling assembly. Preferably, the liquid inlets and liquid outlets of all energy storage units are connected in parallel to the cooling liquid circulating mechanism 80 of the energy storage system. This parallel connection to the cooling liquid circulating mechanism 80 makes the cooling of each energy storage unit independent of each other, so that each energy storage unit is cooled separately to ensure the uniformity of the cooling of the battery module 20 in each energy storage unit. In addition, the end of the box body 10 is also provided with a joint assembly electrically connected to the battery module 20, which is used for electrically connecting the battery module 20 and the energy storage cabinet 70.

[0029] The utility model discloses discard the complicated energy storage cabinet 70 structure design of the past, utilize every energy storage unit's integrated liquid cooling assembly, only need to arrange the frame structure of the applicable energy storage unit on the energy storage cabinet 70. The two joint pipes 50 constituting the liquid inlet and liquid outlet of the liquid cooling assembly in the energy storage unit are arranged at both ends of the box body 10. At the same time, the joint assembly for electrically connecting the battery module 20 and the energy storage cabinet 70 is also arranged at the end of the box body 10, which is conducive to the layout of the lines in the energy storage cabinet 70. Moreover, the liquid cooling assembly adopts the surrounding liquid cooling structure around the battery module 20, which significantly improves the battery heat exchange area and heat exchange efficiency. At the same time, the liquid inlets and liquid outlets of all energy storage units are connected in parallel to the cooling liquid circulating mechanism 80 of the energy storage system, and the battery module 20 in each energy storage unit is sealed in the box body 10, so that each energy storage unit does not interfere with each other, ensuring the uniformity of the cooling of the battery module 20 in each energy storage unit, and having the advantages of better cooling effect and more uniform cooling.

[0030] On the basis of the above, Figure 3 , Figure 5 and Figure 6As shown, the liquid cooling assembly includes the side liquid cooling plate 12 arranged inside the two side plates of the box body 10 and the bottom liquid cooling plate 11 arranged inside the bottom plate of the box body 10, and the two ends of the side liquid cooling plate 12 and the bottom liquid cooling plate 11 are respectively communicated with the two joint pipes 50; the end liquid cooling plates 60 are installed at the two ends of the inner cavity of the box body 10, the two end liquid cooling plates 60 are connected with each other, and the two end liquid cooling plates 60 are respectively communicated with the two joint pipes 50; the inner walls of the side liquid cooling plate 12, the bottom liquid cooling plate 11 and the end liquid cooling plate 60 are attached to the outer wall of the battery module 20, so as to realize the surrounding cooling of the battery module 20 and ensure the cooling effect and uniformity of the battery module 20. In addition, by arranging the side liquid cooling plate 12 inside the two side plates of the box body 10 and the bottom liquid cooling plate 11 inside the bottom plate of the box body 10, it is not necessary to additionally arrange a liquid cooling plate structure in the box body 10, thereby reducing the occupied space of the energy storage unit; at the same time, the two side plates and the bottom plate of the box body 10 also have the function of air heat exchange in the energy storage cabinet 70, so as to dissipate heat for other structures in the energy storage cabinet 70 which need to dissipate heat.

[0031] Further, as shown in Figure 4 The battery module 20 includes a plurality of energy storage batteries arranged side by side along the length direction of the box body 10. In actual implementation, a suitable number of energy storage batteries can be arranged according to the structure of the inner cavity of the box body 10, so as to facilitate the modular production of the box body 10 and the energy storage cabinet 70.

[0032] On the basis of the above, as shown in Figure 4 The top portions of the plurality of energy storage batteries are sequentially connected in series by the high-voltage connecting piece 21, and the joint assembly includes two electrode joints 30 connected with the positive and negative electrodes of the outer energy storage batteries, respectively, so as to ensure that the layout of the outside of the box body 10 is more simple.

[0033] In addition, as shown in Figure 3 The joint assembly further includes a wire harness joint 40 connecting the energy storage unit with the communication interface of the energy storage cabinet 70, so as to collect the information of the battery module 20 by the energy storage cabinet 70.

[0034] On the basis of the above, as shown in Figure 1As shown, the inner cavity of the energy storage cabinet 70 is arranged with a plurality of storage cavities 71 arranged in sequence along the vertical direction, and the energy storage units are independently arranged in the storage cavities 71; the liquid outlet pipeline 81 and the liquid return pipeline 82 of the cooling liquid circulating mechanism 80 are vertically arranged on the two side walls of the energy storage cabinet 70 and extend to the two ends of all the storage cavities 71, and the joint pipes 50 at the two ends of the cabinet 10 are connected to the liquid outlet pipeline 81 and the liquid return pipeline 82 respectively, so that the liquid cooling assembly in each cabinet 10 is connected in parallel with the cooling liquid circulating mechanism 80. This arrangement not only makes the layout of each energy storage unit more simple, but also eliminates the need for complicated wiring of the liquid outlet pipeline 81 and the liquid return pipeline 82 of the cooling liquid circulating mechanism 80 in the energy storage cabinet 70, facilitating quick connection between the liquid cooling assembly in the cabinet 10 and the cooling liquid circulating mechanism 80.

[0035] Further, through holes are arranged between adjacent storage cavities 71 for arranging and passing through the series connection wires between adjacent energy storage units, so as to facilitate quick series connection between adjacent energy storage units.

[0036] In addition, as shown, Figure 1 The side wall of the energy storage cabinet 70 is vertically arranged with an integrated wire harness 72, the integrated wire harness 72 extends to one end of all the storage cavities 71, and the wire harness connectors 40 of all the energy storage units are connected to the communication interface of the energy storage cabinet 70 through the integrated wire harness 72, so that the wiring of the wire harness connectors 40 in the energy storage units and the communication interface of the energy storage cabinet 70 is more simple, facilitating quick connection between the wire harness connectors 40 and the communication interface.

[0037] Of course, for those skilled in the art, the present application is not limited to the details of the above exemplary embodiments, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be considered as limiting the claims involved.

[0038] In addition, it should be understood that although the present application is described in the form of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be properly combined to form other embodiments that can be understood by those skilled in the art.

[0039] The technical, shape and structure parts not described in detail in the present application are known technologies.

Claims

1. A battery liquid-cooled energy storage system, characterized by, The energy storage unit includes a plurality of energy storage cells installed in series electrically in an energy storage cabinet (70), the energy storage unit includes a box body (10) and a battery module (20) sealedly installed in the inner cavity of the box body (10), a liquid cooling assembly is arranged around the outer periphery of the battery module (20) on the box body (10), a joint pipe (50) is installed at both ends of the box body (10), and the joint pipe (50) forms a liquid inlet and a liquid outlet of the liquid cooling assembly respectively, and the liquid inlet and the liquid outlet are connected to a cooling liquid circulating mechanism (80) of the energy storage cabinet (70); the end of the box body (10) is further provided with a joint assembly for electrically connecting the battery module (20) and the energy storage cabinet (70).

2. The battery liquid-cooled energy storage system of claim 1, wherein, The liquid cooling assembly includes side liquid cooling plates (12) embedded in the inner sides of the two side plates of the box body (10) and a bottom liquid cooling plate (11) embedded in the inner bottom plate of the box body (10), and the two ends of the side liquid cooling plates (12) and the bottom liquid cooling plate (11) are respectively communicated with the two joint pipes (50); end liquid cooling plates (60) are installed at both ends of the inner cavity of the box body (10), the two end liquid cooling plates (60) are connected to each other, and the two end liquid cooling plates (60) are respectively communicated with the two joint pipes (50); the inner walls of the side liquid cooling plates (12), the bottom liquid cooling plate (11) and the end liquid cooling plates (60) are attached to the outer walls of the battery module (20).

3. The battery liquid-cooled energy storage system of claim 1 or 2, wherein, The battery module (20) includes a plurality of energy storage batteries arranged side by side along the length direction of the box body (10).

4. The battery liquid-cooled energy storage system of claim 3, wherein, The top portions of the plurality of energy storage batteries are connected in series by a high-voltage connecting piece (21), and the joint assembly includes two electrode joints (30) connected to the positive and negative electrodes of the outer end energy storage battery respectively.

5. The battery liquid-cooled energy storage system of claim 4, wherein, The joint assembly further includes a wire harness joint (40) connecting the energy storage unit and a communication interface of the energy storage cabinet (70).

6. The battery liquid-cooled energy storage system of claim 5, wherein, The inner cavity of the energy storage cabinet (70) is arranged with a plurality of storage cavities (71) arranged in the vertical direction, the energy storage unit is independently arranged in the storage cavity (71), and the liquid outlet pipeline (81) and the liquid return pipeline (82) of the cooling liquid circulating mechanism (80) are vertically arranged on the two side walls of the energy storage cabinet (70) and extend to the two ends of all the storage cavities (71), and the joint pipes (50) at both ends of the box body (10) are connected to the liquid outlet pipeline (81) and the liquid return pipeline (82) respectively.

7. The battery liquid-cooled energy storage system of claim 6, wherein, A through hole is arranged between adjacent storage cavities (71) for arranging the through arrangement of the series connection wire between adjacent energy storage units.

8. The battery liquid-cooled energy storage system of claim 6, wherein, The side wall of the energy storage cabinet (70) is vertically arranged with an integrated wire harness (72), the integrated wire harness (72) extends to one end of all the storage cavities (71), and the wire harness joints (40) of all the energy storage units are connected to the communication interface of the energy storage cabinet (70) through the integrated wire harness (72).

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