Battery energy storage system

Abstract

The utility model discloses a battery energy storage system, which comprises a cabinet body, a plurality of battery modules and a liquid cooling device, and is characterized in that an electrical cabin and a sealed battery cabin are formed in the cabinet body; the plurality of battery modules are arranged in the battery compartment, the battery compartment is filled with a cooling medium, and the battery modules are immersed in the cooling medium; the liquid cooling device is mounted in the electric cabin and comprises a liquid inlet and a liquid return opening, and the liquid inlet and the liquid return opening are communicated with the battery cabin, so that a cooling medium forms cooling circulation between the battery cabin and the liquid cooling device. The problem that an existing battery energy storage system is poor in heat dissipation effect is solved, the heat dissipation effect is good, and the reliability of the battery energy storage system is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to an energy storage battery system. BACKGROUND

[0002] The core functional components of a battery energy storage system are a plurality of battery modules. The battery modules store electrical energy and output the electrical energy when needed, thereby achieving cyclic operation. However, a large amount of heat is generated when the battery modules are charged and discharged. An excessively high temperature environment can affect the cycle life and reliability of the battery modules, and even cause safety hazards. Therefore, the battery modules need to be cooled.

[0003] In the related art, air cooling is used to dissipate heat from the battery modules. The heat dissipation efficiency is low, and the heat dissipation effect is poor. There are also liquid cooling plates used to dissipate heat from the battery modules. The contact area between the liquid cooling plate and the battery module is limited, and the heat dissipation effect is generally poor. CONTENT OF THE UTILITY MODEL

[0004] Embodiments of the application provide an energy storage battery system to solve the problem of poor heat dissipation effect of existing battery energy storage systems.

[0005] In a first aspect, embodiments of the application provide a battery energy storage system, comprising:

[0006] a cabinet body, an electrical compartment and a sealed battery compartment being formed in the cabinet body;

[0007] a plurality of battery modules arranged in the battery compartment, the battery compartment being filled with a cooling medium, and the cooling medium immersing the battery modules;

[0008] a liquid cooling device installed in the electrical compartment, the liquid cooling device comprising a liquid inlet and a liquid return, the liquid inlet and the liquid return being in communication with the battery compartment, so that the cooling medium forms a cooling cycle between the battery compartment and the liquid cooling device.

[0009] Optionally, a plurality of liquid inlets are arranged, and each liquid inlet corresponds to one battery module.

[0010] Optionally, the battery module comprises a battery pack and a bracket, the bracket has a mounting groove, the battery pack is installed in the mounting groove, the bracket is fixedly connected with the battery compartment, and the liquid inlet is in communication with the mounting groove.

[0011] Optionally, a plurality of through holes are arranged on the bracket, the through holes penetrate the side wall of the bracket, a channel is formed in the side wall of the bracket, and the channel is in communication with the through holes and the liquid inlet.

[0012] Optionally, the battery pack comprises a plurality of single batteries arranged in sequence, and the through holes are located between adjacent single batteries.

[0013] Optionally, the liquid cooling device comprises a liquid cooling machine, a main pipeline, a liquid return pipeline and a plurality of branch pipelines, the main pipeline is connected with the liquid cooling machine and the plurality of branch pipelines, one end of the branch pipeline away from the main pipeline is provided with the liquid inlet, one end of the liquid return pipeline is connected with the liquid cooling machine, and the other end is provided with the liquid return outlet.

[0014] Optionally, a plurality of partitions are arranged in the battery compartment, the plurality of partitions are arranged at intervals along the height direction of the cabinet, and the battery compartment is divided into a plurality of battery sub-compartments, the battery sub-compartments are communicated with each other, and the battery module is arranged in the corresponding battery sub-compartment.

[0015] Optionally, the liquid return outlet is close to the bottom of the battery compartment.

[0016] Optionally, an air balance valve is arranged on the cabinet at the top of the battery compartment, and the cooling medium is spaced apart from the air balance valve by a certain distance.

[0017] Optionally, the application further comprises a fire detection device arranged in the electrical compartment and / or the battery compartment, wherein the fire detection device is configured to monitor a fire signal in the electrical compartment and / or the battery compartment.

[0018] A fire extinguishing device is arranged in the battery compartment and / or the electrical compartment.

[0019] Optionally, the application further comprises a fire control device and an alarm device, wherein the fire detection device, the fire extinguishing device and the alarm device are connected with the fire control device, and the fire control device is configured to:

[0020] control the fire extinguishing device to start according to the fire signal;

[0021] control the alarm device to send an alarm information according to the fire signal.

[0022] Optionally, the application further comprises a start-stop button arranged on the cabinet, wherein the start-stop button is connected with the fire extinguishing device, and the start-stop button is configured to control the start-stop of the fire extinguishing device.

[0023] Optionally, the cabinet comprises a thermal insulation cotton layer arranged in the interlayer of the outer surface and / or the inner surface of the cabinet and / or the side wall.

[0024] The battery energy storage system provided by the embodiment of the application comprises a cabinet body, a plurality of battery modules and a liquid cooling device, an electrical bin and a sealed battery bin are formed in the cabinet body, the battery modules are installed in the battery bin, the battery bin is filled with a cooling medium, the cooling medium is immersed in the battery modules, the liquid cooling device comprises an inlet and a return port, the inlet and the return port are communicated with the battery bin, so that the cooling medium forms a cooling circulation between the battery bin and the liquid cooling device, the battery modules are cooled in all directions, the cooling effect is good, the occupied space is small, the problem of poor heat dissipation effect of the existing battery energy storage system is overcome, and the reliability of the battery energy storage system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description only some embodiments of the application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0026] In order to more completely understand the application and its beneficial effects, the following will be described with reference to the drawings. In the following description, the same reference numerals represent the same parts.

[0027] Figure 1 The external schematic diagram of the battery energy storage system provided by the embodiment of the application.

[0028] Figure 2 The internal schematic diagram of the battery energy storage system provided by the embodiment of the application.

[0029] Figure 3 The cooling circulation system schematic diagram of the battery energy storage system provided by the embodiment of the application.

[0030] Figure 4 The pipeline schematic diagram of the battery energy storage system provided by the embodiment of the application connecting the liquid cooling machine and the battery bin.

[0031] Figure 5 The structural schematic diagram of the support of the battery module in the battery energy storage system provided by the embodiment of the application.

[0032] Figure 6 The schematic diagram of the top of the battery energy storage system provided by the embodiment of the application.

[0033] Figure 7 The installation schematic diagram of the fire extinguishing device of the battery energy storage system provided by the embodiment of the application.

[0034] Figure 8 The schematic diagram of the alarm device and the start-stop button installed on the cabinet door of the battery energy storage system provided by the embodiment of the application.

[0035] The attached icon is labeled as follows:

[0036] 100. Cabinet; 110. Electrical compartment; 120. Battery compartment; 121. Partition; 122. Battery sub-compartment; 140. Explosion relief plate; 150. Ventilation balance valve; 170. Baffle;

[0037] 200. Battery module; 210. Bracket; 211. Through hole; 220. Mounting slot;

[0038] 300. Liquid cooling device; 310. Liquid inlet; 320. Liquid return outlet; 330. Liquid chiller; 340. Main pipeline; 350. Branch pipeline; 360. Return pipe;

[0039] 400. Fire detection equipment;

[0040] 500. Fire extinguishing equipment;

[0041] 600. Fire control devices;

[0042] 700. Alarm device;

[0043] 800. Start / Stop button. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0045] See Figure 1 , Figure 2 and Figure 3 This application provides a battery energy storage system, including a cabinet 100, multiple battery modules 200 and a liquid cooling device 300.

[0046] In some embodiments, see Figure 1 , Figure 2 and Figure 3The cabinet 100 has a cubic structure and can be made of stainless steel. In some embodiments, the cabinet 100 has a multi-layer structure, such as two layers of steel plates forming a sandwich layer with an insulation layer inside. The insulation layer can also be placed on the inner or outer sidewalls of the cabinet 100. By placing the insulation layer, the probability of heat exchange between the inside and outside of the cabinet 100 affecting the battery module 200 is reduced. In some embodiments, the bottom of the cabinet 100 has a forklift hole, and the top has a lifting ring. The cabinet 100 can be moved or lifted using mechanical equipment through the forklift hole or lifting ring, making operation simple. A baffle 170 is provided inside the cabinet 100, extending along the height of the cabinet 100, dividing the space inside the cabinet 100 into an electrical compartment 110 and a sealed battery compartment 120.

[0047] In some embodiments, see Figure 2 and Figure 3 Multiple battery modules 200 are arranged and installed within a sealed battery compartment 120. For example, the multiple battery modules 200 are stacked along the height of the cabinet 100. In some embodiments, the uppermost battery module 200 is spaced a certain distance from the top of the cabinet 100, and a certain installation space is formed between the battery module 200 and the cabinet 100, allowing related devices to be installed within this space without interference. The battery compartment 120 is filled with a cooling medium. The cooling medium can be a liquid coolant such as synthetic oil, mineral oil, or fluorinated liquid. The cooling medium immerses the battery modules 200 so that each battery module 200 is submerged in the cooling medium.

[0048] In some embodiments, see Figure 3 and Figure 4 A liquid cooling device 300 is installed inside the electrical compartment 110. The liquid cooling device 300 can be an air-cooled liquid chiller. The electrical compartment 110 also houses electrical components such as a high-voltage box and a PCS (Power Control System). The liquid cooling device 300 includes an inlet 310 and a return port 320, which are connected to the battery compartment 120, allowing the cooling medium to form a cooling cycle between the battery compartment 120 and the liquid cooling device 300. After heat exchange between the cooling medium in the battery compartment 120 and the battery module 200, the cooling medium flows out through the return port 320, is cooled by the liquid cooling device 300, and then flows back into the battery compartment 120 through the inlet 310, providing circulating cooling for the battery module 200. This improves the cooling effect of the battery module 200.

[0049] In some embodiments, see Figure 3 and Figure 4Multiple liquid inlets 310 are provided, each corresponding to one battery module 200. The liquid inlets 310 are located next to the battery module 200, and the cooling medium flowing out of the liquid inlets 310 flows directly to the corresponding battery module 200. This ensures that the cooling effect of the cooling medium flowing to each battery module 200 is consistent, guaranteeing the cooling effect of each battery module 200 and improving the reliability of the battery module 200.

[0050] In other embodiments, a liquid inlet 310 is provided, located near the top of the cabinet 100. The cooling medium flowing through the liquid inlet 310 passes sequentially from top to bottom through each battery module 200, thereby cooling each battery module 200. The liquid inlet 310 occupies little space and is simple to arrange.

[0051] In some embodiments, see Figure 3 and Figure 5 The battery module 200 includes a battery pack and a bracket 210. The battery pack includes multiple individual cells, which are arranged sequentially along the width or length direction. The bracket 210 has a mounting groove 220. The bracket 210 includes a base plate and a side plate, which together form the mounting groove 220. The battery pack is installed in the mounting groove 220, and the bracket 210 is fixedly connected to the battery compartment 120. A liquid inlet 310 communicates with the mounting groove 220. Each liquid inlet 310 corresponds to one mounting groove 220. The cooling medium flowing out of the liquid inlet 310 immerses the battery pack, cooling each individual cell and providing good heat dissipation.

[0052] In some embodiments, see Figure 2 The battery compartment 120 is equipped with multiple partitions 121, which are spaced apart along the height of the cabinet, dividing the battery compartment 120 into multiple battery sub-compartments 122. The battery sub-compartments 122 are interconnected, and the battery modules 200 are installed in their respective battery sub-compartments 122. The bracket 210 can be pulled out and installed in the battery sub-compartments 122, facilitating the installation and removal of the battery modules 200.

[0053] In some embodiments, see Figure 5 The support 210 is provided with multiple through holes 211, which penetrate the side wall of the support 210. A channel is formed in the side wall of the support 210, which connects the through holes 211 and the liquid inlet 310.

[0054] For example, see Figure 5The bracket 210 includes a base plate and three side plates, which together form a mounting groove 220 with openings at the top and ends. Multiple through holes 211 are formed on the side plates at both ends of the individual battery cell, penetrating the side plates. Channels are formed inside the side plates, communicating with the through holes 211. Interfaces are provided at the ends of the side plates, communicating with the channels and connecting to liquid inlets 310. Cooling medium flowing from the liquid inlets 310 enters the channels within the side plates through the interfaces, then flows out through the through holes 211, immersing the individual battery cell.

[0055] In this embodiment, by providing channels and multiple through holes 211 on the bracket 210, the cooling medium flowing from the inlet 310 is directed to various locations of the battery module 200, improving the fluidity of the cooling medium. This ensures heat dissipation at all parts of the battery module 200, reduces the probability of the battery module 200 exploding due to localized overheating, and improves the reliability of the battery module 200.

[0056] In some embodiments, see Figure 5 The battery pack comprises multiple individual cells arranged sequentially along the length of the support 210. Through-holes 211 are located between adjacent individual cells, allowing cooling medium flowing out of the through-holes 211 to enter the gaps between adjacent cells, reducing the probability of individual cells obstructing the flow of cooling medium and ensuring the heat dissipation effect of each individual cell.

[0057] In some embodiments, see Figure 3 and Figure 4 The liquid cooling device 300 includes a liquid cooler 330, a main pipe 340, a return pipe 360, and multiple branch pipes 350. The main pipe 340 connects the liquid cooler 330 and the multiple branch pipes 350. One end of each branch pipe 350 away from the main pipe 340 is provided with a liquid inlet 310. One end of the return pipe 360 ​​is connected to the liquid cooler 330, and the other end is provided with a return port 320.

[0058] For example, see Figure 3 and Figure 4The liquid cooler 330 has an inlet and an outlet. One end of the main pipe 340 is connected to the outlet of the liquid cooler 330. The main pipe 340 passes through the top of the cabinet 100 and enters the battery compartment 120. The section where the main pipe 340 passes through the side wall of the battery compartment 120 is sealed to reduce the probability of leakage caused by the installation of the main pipe 340. The main pipe 340 extends along the height of the cabinet 100 to a position near the bottom of the battery compartment 120, and is located on one side of the battery module 200. Along the direction of extension of the main pipe 340, multiple pipe joints are provided on the main pipe 340, each pipe joint connecting to a branch pipe 350. The branch pipes 350 are horizontally arranged, and the end of the branch pipe 350 opposite to the pipe joint is the liquid inlet 310. Each branch pipe 350 corresponds to one battery module 200. The diameter of branch pipe 350 is smaller than that of main pipe 340, increasing the flow rate of the cooling medium within branch pipe 350. One end of return pipe 360 ​​connects to the inlet of liquid cooler 330, and the other end is a return port 320. Return pipe 360 ​​passes through baffle 170 between electrical compartment 110 and battery compartment 120, and the connection between return pipe 360 ​​and baffle 170 is sealed. Return pipe 360 ​​is positioned near the bottom of battery compartment 120, below all battery modules 200. This allows the cooling medium to flow back into liquid cooler 330 as much as possible for cooling, reducing the amount of hot cooling medium remaining in battery compartment 120 and improving cooling efficiency.

[0059] In this embodiment, the pipeline connecting the battery compartment 120 and the liquid cooler 330 has a main pipeline 340 and multiple branch pipelines 350. The multiple branch pipelines 350 are arranged in parallel to each other to reduce the temperature difference between the battery modules 200 and improve the cooling effect.

[0060] In some embodiments, see Figure 1 and Figure 6 A pressure relief plate 140 is installed on the cabinet 100 at the top of the battery compartment 120. The cabinet 100 at the top of the battery compartment 120 has an opening, which is sealed by the pressure relief plate 140, and the pressure relief plate 140 is sealed to the cabinet 100 surrounding the opening. The pressure relief plate 140 can be a rectangular or circular plate structure. When the air pressure inside the battery compartment 120 exceeds a preset air pressure value, the pressure relief plate 140 bursts open to release pressure. This reduces the probability of the battery energy storage system exploding due to excessive air pressure inside the battery compartment 120, thus improving the reliability of the battery energy storage system.

[0061] In some embodiments, see Figure 6A ventilated balancing valve 150 is installed on the cabinet 100 at the top of the battery compartment 120, and the cooling medium is spaced a certain distance from the ventilated balancing valve 150. The ventilated balancing valve 150 is sealed to the cabinet 100. The ventilated balancing valve 150 is an assemblable and detachable protective component formed by combining the ventilated membrane material with the valve body through processes such as injection molding, welding, bonding, and hot melting. Under the action of pressure difference, the gas inside and outside the battery compartment 120 passes through the gas channel of the ventilated balancing valve 150, passes through the ventilated membrane material, and performs gas compensation to maintain the pressure balance of the gas inside and outside the battery compartment 120.

[0062] In some embodiments, see Figure 2 and Figure 7 The system also includes a fire detection device 400 and a fire extinguishing device 500. The fire detection device 400 is installed within the electrical compartment 110 and / or the battery compartment 120, and is configured to monitor fire signals within the electrical compartment 110 and / or the battery compartment 120. The fire detection device 400 can be a heat detector, smoke detector, combined smoke and heat detector, ultraviolet flame detector, combustible gas detector, infrared beam detector, etc. The fire detection device 400 is installed on the cabinet 100 at the top of the battery compartment 120, with the cooling medium at a certain distance from the fire detection device 400. The fire detection device 400 can also be installed on the cabinet 100 at the top of the electrical compartment 110. The fire extinguishing device 500 is installed within the battery compartment 120 and / or the electrical compartment 110. For example, the fire extinguishing device 500 is installed on the cabinet 100 at the top of the battery compartment 120, with the fire extinguishing device 500 at a certain distance from the cooling medium. The fire extinguishing device 500 can be a fire extinguisher.

[0063] In this embodiment of the application, the battery energy storage system also includes a fire detection device 400 and a fire extinguishing device 500, which can promptly handle the fire inside the cabinet 100 and reduce the probability of serious consequences caused by the spread of the fire.

[0064] In some embodiments, see Figure 7 It also includes a fire control device 600, which is installed inside the electrical compartment 110. Fire detection equipment 400 and fire extinguishing equipment 500 are respectively connected to the fire control device 600, which is configured to activate the fire extinguishing device 500 based on a fire signal. For example, the fire detection equipment 400 monitors smoke information in the battery compartment 120 in real time, and the fire control device 600 has a preset smoke threshold. When the smoke information exceeds the smoke threshold, the fire control device 600 controls the fire extinguishing device 500 to activate. The monitoring is highly sensitive and the degree of automation is high.

[0065] In some embodiments, see Figure 8It also includes an alarm device 700, which is connected to the fire detection equipment 400. The alarm device 700 is configured to issue an alarm message based on a fire signal. The alarm device 700 can be an audible and visual alarm. The alarm device 700 is installed on the outer wall of the cabinet 100's door for easy observation of the alarm message by the user.

[0066] In some embodiments, see Figure 8 It also includes a start / stop button 800, installed on the cabinet 100. The start / stop button 800 is connected to the fire extinguishing device 500 and is configured to control the start and stop of the fire extinguishing device 500. The start / stop button 800 is installed on the outer wall of the door of the cabinet 100. After the alarm device 700 issues an alarm, the staff can use the start / stop button 800 to control the fire extinguishing device 500 to start fire extinguishing.

[0067] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0068] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0069] The battery energy storage system provided in the embodiments of this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery energy storage system, characterized in that, include: A cabinet (100) having an electrical compartment (110) and a sealed battery compartment (120) formed therein; Multiple battery modules (200) are disposed in the battery compartment (120), the battery compartment (120) is filled with a cooling medium, and the cooling medium immerses the battery modules (200); A liquid cooling device (300) is installed inside the electrical compartment (110). The liquid cooling device (300) includes an inlet (310) and a return outlet (320). The inlet (310) and the return outlet (320) are connected to the battery compartment (120), so that the cooling medium forms a cooling cycle between the battery compartment (120) and the liquid cooling device (300).

2. The battery energy storage system according to claim 1, characterized in that, Multiple liquid inlets (310) are provided, and each liquid inlet (310) corresponds to one battery module (200).

3. The battery energy storage system according to claim 2, characterized in that, The battery module (200) includes a battery pack and a bracket (210). The bracket (210) has a mounting groove (220). The battery pack is installed in the mounting groove (220). The bracket (210) is fixedly connected to the battery compartment (120). The liquid inlet (310) is connected to the mounting groove (220).

4. The battery energy storage system according to claim 3, characterized in that, The bracket (210) is provided with a plurality of through holes (211), the through holes (211) penetrate the side wall of the bracket (210), and a channel is formed in the side wall of the bracket (210), the channel connecting the through holes (211) and the liquid inlet (310).

5. The battery energy storage system according to claim 4, characterized in that, The battery pack includes multiple individual cells arranged in sequence, and the via (211) is opposite to the adjacent individual cells.

6. The battery energy storage system according to claim 2, characterized in that, The liquid cooling device (300) includes a liquid cooler (330), a main pipeline (340), a return pipeline (360), and multiple branch pipelines (350). The main pipeline (340) connects the liquid cooler (330) and the multiple branch pipelines (350). The end of each branch pipeline (350) opposite to the main pipeline (340) is provided with a liquid inlet (310). One end of the return pipeline (360) is connected to the liquid cooler (330), and the other end is provided with a return port (320).

7. The battery energy storage system according to any one of claims 1 to 6, characterized in that, The battery compartment (120) is provided with multiple partitions (121), which are spaced apart along the height of the cabinet to divide the battery compartment (120) into multiple battery sub-compartments (122). The battery sub-compartments (122) are interconnected, and the battery module (200) is installed in the corresponding battery sub-compartment (122).

8. The battery energy storage system according to any one of claims 1 to 6, characterized in that, The return port (320) is located near the bottom of the battery compartment (120).

9. The battery energy storage system according to any one of claims 1 to 6, characterized in that, A ventilated balance valve (150) is provided on the cabinet (100) at the top of the battery compartment (120), and the cooling medium is spaced a certain distance from the ventilated balance valve (150).

10. The battery energy storage system according to any one of claims 1 to 6, characterized in that, Also includes: A fire detection device (400) is installed in the electrical compartment (110) and / or the battery compartment (120), and the fire detection device (400) is configured to monitor fire signals in the electrical compartment (110) and / or the battery compartment (120); A fire extinguishing device (500) is provided in the battery compartment (120) and / or the electrical compartment (110).

11. The battery energy storage system according to claim 10, characterized in that, It also includes a fire control device (600) and an alarm device (700), wherein the fire detection device (400), the fire extinguishing device (500), and the alarm device (700) are respectively connected to the fire control device (600), and the fire control device (600) is configured as follows: The fire extinguishing device (500) is activated according to the fire signal; The alarm device (700) is controlled to issue an alarm message according to the fire signal.

12. The battery energy storage system according to claim 11, characterized in that, It also includes a start / stop button (800) installed on the cabinet (100), the start / stop button (800) being connected to the fire extinguishing device (500), and the start / stop button (800) being configured to control the start and stop of the fire extinguishing device (500).

13. The battery energy storage system according to claim 4 or 5, characterized in that, The cabinet (100) includes a thermal insulation layer, which is disposed in the interlayer of the outer surface and / or inner surface and / or sidewall of the cabinet (100).

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