Energy storage device

Abstract

The utility model discloses an energy storage device which comprises an energy storage cabinet, and an energy storage unit and a fire-fighting module which are arranged in the energy storage cabinet, and the fire-fighting module comprises a detection assembly, an execution assembly and a fire-fighting controller which is in communication connection with the detection assembly and the execution assembly. The detection assembly comprises at least one of a temperature sensor used for detecting the temperature of the energy storage unit and a gas sensitive sensor used for detecting the gas concentration in the energy storage unit, and the fire fighting controller is used for analyzing information detected by the detection assembly and controlling the execution assembly to carry out early warning response.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of energy storage equipment, especially relates to an energy storage device. BACKGROUND

[0002] The energy storage device is a device for storing and managing energy, mainly used for storing electric energy, such as battery packs, super capacitors, etc. It converts electric energy into chemical energy or physical energy for storage through chemical reaction or physical change, and converts the stored energy into electric energy for user use when needed.

[0003] Since the energy storage units in the energy storage device will generate heat during charging and discharging, and the heat is positively correlated with the energy density and charging and discharging rate of the energy storage units, real-time monitoring and early warning of the energy storage device are particularly critical. Although the existing energy storage device is installed with a fire alarm module, there are false alarms and missed alarms, which is not conducive to precise management of the operation of the energy storage device. SUMMARY

[0004] Therefore, the utility model aims to provide an energy storage device, which can solve the problem of low accuracy of operation early warning of the existing energy storage device.

[0005] In order to achieve the above technical purpose, the utility model provides an energy storage device, which comprises an energy storage cabinet, and an energy storage unit and a fire module arranged in the energy storage cabinet, the fire module comprises a detection assembly, an execution assembly, and a fire controller in communication connection with the detection assembly and the execution assembly, the detection assembly comprises at least one of a temperature sensor for detecting the temperature of the energy storage unit and a gas sensitive sensor for detecting the gas concentration in the energy storage unit, the fire controller is used for analyzing the information detected by the detection assembly and controlling the execution assembly to respond to the early warning.

[0006] In an embodiment, the execution assembly comprises an alarm, an explosion-proof valve, a fire pipeline and a piercing valve, the alarm is used for first-level early warning response, the explosion-proof valve is used for second-level early warning response, and the fire pipeline and the piercing valve are used for third-level early warning response.

[0007] In an embodiment, the energy storage unit comprises a battery, and the battery comprises a plurality of battery cells, and the capacity of the battery cell is greater than or equal to 314Ah.

[0008] In an embodiment, the number of the battery is multiple, and the multiple batteries are arranged along the height direction of the energy storage cabinet.

[0009] In an embodiment, the energy storage device further comprises a cooling system, and the cooling system comprises a liquid cooling unit, a liquid cooling plate arranged outside the energy storage unit, and a heat dissipation pipeline for circulating cooling medium.

[0010] In an embodiment, the energy storage device further comprises an energy storage converter for controlling the charging and discharging process of the energy storage unit.

[0011] In an embodiment, the energy storage device further comprises a battery management system for real-time monitoring and management of the energy storage unit.

[0012] In an embodiment, the energy storage cabinet forms a containing space therein, and comprises horizontal partitions arranged in parallel with the bottom surface of the energy storage cabinet and vertical partitions arranged in parallel with the side surface of the energy storage cabinet, the containing space being divided into multiple containing areas by the horizontal partitions and the vertical partitions.

[0013] In an embodiment, the multiple containing areas comprise a liquid cooling unit area, a converter area and an energy storage area, wherein the liquid cooling unit area and the converter area are arranged side by side in the vertical direction, and the energy storage area is located on one side of the liquid cooling unit area and the converter area in the horizontal direction.

[0014] In an embodiment, the capacity of the energy storage device is greater than or equal to 783 kWh.

[0015] By adopting the above technical solution, the utility model has the following beneficial effects:

[0016] The utility model discloses a fire-fighting module for early warning of the operation of the energy storage unit is arranged in the energy storage cabinet, and the fire-fighting module is controlled according to a predetermined algorithm to respond to different levels of early warning, when the energy storage device is operating, not only can the temperature of the energy storage unit and / or the gas concentration in the energy storage unit be monitored and early warned in real time, to ensure that the maintenance personnel timely control in advance of thermal runaway of the energy storage unit, but also is beneficial to solve the problem of high false alarm and missed alarm frequency of the existing energy storage device, and is convenient for accurate management of the operation of the energy storage device. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will be briefly introduced the drawings needed to be used in the embodiments, it should be understood that the following drawings only show some embodiments of the utility model, therefore should not be regarded as the limitation to the scope, for the ordinary skilled person in the art, under the premise of not paying the creative labor, still can obtain other related drawings according to these drawings.

[0018] Figure 1 A structural schematic diagram of an energy storage device provided for the embodiments of the utility model is shown in the drawings.

[0019] Figure 2 For Figure 1 A structural schematic diagram of an energy storage unit, a fire-fighting module and a cooling system in the energy storage device shown in the drawings.

[0020] Figure 3 For Figure 1 The energy storage device is shown in the state diagram when the cabinet door is closed.

[0021] Reference signs:

[0022] 1, energy storage cabinet; 2, energy storage unit; 3, fire-fighting module; 4, cooling system; 5, energy storage converter; 6, battery management system; 7, display screen;

[0023] 11, cabinet door; 12, air inlet; 13, air outlet;

[0024] 21, battery;

[0025] 31, detection assembly; 32, execution assembly;

[0026] 321, alarm; 322, fire-fighting pipeline; 323, piercing valve;

[0027] 41, liquid cooling unit; 42, liquid cooling plate; 43, heat dissipation pipeline. DETAILED DESCRIPTION

[0028] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the description of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0029] In the description of the present application, unless otherwise explicitly specified and limited, the terms "set", "install", "connect" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or 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. For ordinary skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0030] The terms "up", "down", "left", "right", "front", "back", "top", "bottom", "inside", "outside" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the present application is used, which is only for the convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application.

[0031] The terms "first", "second", "third" and the like are only used to distinguish similar attributes of elements, and do not indicate or imply relative importance or a specific order.

[0032] The terms “include,” “comprising,” or any other variation thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0033] Please see Figure 1 This utility model provides an energy storage device for storing and managing electrical energy, comprising an energy storage cabinet 1, an energy storage unit 2, and a fire protection module 3, wherein the energy storage unit 2 and the fire protection module 3 are installed inside the energy storage cabinet 1. Specifically, the fire protection module 3 includes a detection component 31, an execution component 32, and a fire controller (not shown). The fire controller is communicatively connected to the detection component 31 and the execution component 32, and is used to analyze the information detected by the detection component 31 and control the execution component 32 to provide an early warning response. It should be noted that the fire controller mentioned here is one of the key devices for ensuring the safe operation of the energy storage device. It not only has automated control and management functions, but also remote monitoring and diagnostic functions. By collecting the information detected by the detection component 31 in real time and then linking it with the execution component 32, it is of great significance for improving the safety of the energy storage device, protecting the safety of personnel and equipment, and reducing fire losses.

[0034] In some embodiments, the detection component 31 may include at least one of a temperature sensor, a gas sensor, a smoke detector, and a hazardous gas detector. In this embodiment, to facilitate timely detection of early fire risks by personnel and prevent thermal runaway of the energy storage unit 2, the detection component 31 includes a temperature sensor (not shown) and a gas sensor (not shown). The temperature sensor is used to detect the temperature of the energy storage unit 2, and the gas sensor is used to detect the gas concentration within the energy storage unit 2. It should be noted that the gas concentration mentioned here refers to the concentration of hazardous gases, which may be CO. Preferably, the detection component 31 is a composite fire detection structure capable of monitoring changes in gas and temperature in the environment. This composite fire detection structure has a temperature measurement range of -40℃ to +125℃ and a CO measurement range of 0 to 2000 ppm.

[0035] like Figure 2 , Figure 3As shown, in order to improve the safety of the energy storage device, the execution assembly 32 includes an alarm 321, an explosion-proof valve (not shown), a fire control pipeline 322 and a piercing valve 323. The alarm 321 is installed on the cabinet door 11 of the energy storage cabinet 1 and is used for a first level of early warning response. The explosion-proof valve is arranged in the energy storage cabinet 1 and is used for a second level of early warning response. The fire control pipeline 322 is arranged in the energy storage cabinet 1, and the piercing valve 323 is arranged at the end of the fire control pipeline 322 and is used for a third level of early warning response together with the fire control pipeline 322. Preferably, the alarm 321 is an audible and visual alarm. Thus, when the detection assembly 31 detects that the air environment and temperature change in the energy storage device are abnormal and reach a first level of early warning condition, the fire control controller opens the alarm 321 and uploads a first level of alarm information through RS485 (a standard for multi-point communication of balanced transmission lines in half duplex, 2-wire, and physical layer electrical characteristics belonging to OSI model), so as to facilitate the staff to discover the early fire risk in time and avoid thermal runaway of the energy storage unit 2. When the air environment and temperature change in the energy storage device reach a second level of early warning condition, the fire control controller opens the alarm 321 and the explosion-proof valve and uploads a second level of alarm information through RS485. It is worth mentioning that when the explosion-proof valve responds, the air inlet 12 and the air outlet 13 on the cabinet door 11 form a convection with the outside air, so as to reduce the concentration of harmful gas in the energy storage cabinet 1 and the temperature of the energy storage unit 2 and prevent deflagration. When the air environment and temperature change in the energy storage device reach a third level of early warning condition, the fire control controller first opens the alarm 321 and the explosion-proof valve, and then closes the explosion-proof valve, so that the air inlet 12 and the air outlet 13 on the cabinet door 11 form a convection with the outside air and then are in a closed state, which facilitates preventing the expansion and spread of fire by isolating air. After a delay, the piercing valve 323 is opened to form a passage of the fire control pipeline 322, so as to facilitate extinguishing the battery 21 with thermal runaway in the energy storage cabinet 1, and upload a third level of alarm information through RS485. It is worth mentioning that in a normal working state, the piercing valve 323 is in a closed state. When the alarm level reaches the third level, the piercing valve 323 responds under the drive of a preset voltage, so as to form a passage of the fire control pipeline 322 between the fire control module 3 and the battery 21 with thermal runaway, thereby facilitating the extinguishing agent to reach the battery 21 with thermal runaway through the fire control pipeline 322. It should be noted that since the concentration of toxic gas is small at the initial stage of thermal runaway of the battery 21, the main released gas is the electrolyte sprayed at high temperature. In this embodiment, in order to accurately and quickly detect the fire signs, the three levels of early warning conditions are mainly distinguished based on the temperature detected by the temperature sensor. Specifically, when the temperature detected by the temperature sensor is 50-75℃, the first level of early warning condition is reached. When the temperature detected by the temperature sensor is 75-100℃, the second level of early warning condition is reached. When the temperature detected by the temperature sensor is greater than 100℃, the third level of early warning condition is reached.Compared with the prior art, the utility model discloses the design concept of multistage early warning, not only can overcome the false alarm, the problem of missing alarm, also be beneficial to accurate management energy storage device's operation.

[0036] According to the inventor's understanding, the installed capacity of the current industrial and commercial energy storage device is low, and the capacity of 215kWh, 232kWh or less than 232kWh is mostly, which is not conducive to improve the overall income of the energy storage equipment, based on this, the capacity of the energy storage device disclosed by the utility model is greater than or equal to 783kWh, which is convenient for making the installed capacity large enough in the limited floor space. Specifically, the energy storage unit 2 of the energy storage device includes a battery 21, the battery 21 includes a plurality of battery cells, and the capacity of the battery cell is greater than or equal to 314Ah. Preferably, the number of battery cells in the battery 21 is 52 or 104.

[0037] In some embodiments, the number of batteries 21 is multiple, and in the embodiment, in order to make the capacity of the energy storage device greater than or equal to 783kWh, the number of batteries 21 is 9. It should be noted that the nine batteries 21 are arranged in a direction perpendicular to the ground and are electrically connected, which is beneficial to reduce the floor area.

[0038] Since the energy storage unit 2 in the energy storage device will generate heat during charging and discharging, and the heat is positively correlated with the energy density and the charging and discharging rate of the energy storage unit 2, the heat dissipation of the energy storage unit 2 is particularly critical. Figure 1 、 Figure 2 As shown in the figure, the energy storage device also includes a cooling system 4. The cooling system 4 includes a liquid cooling unit 41, a liquid cooling plate 42 and a heat dissipation pipeline 43, wherein the liquid cooling unit 41 can include a compressor, a condenser, an expansion valve, an evaporator and a cooling pump, etc., for providing a cold source; the liquid cooling plate 42 is installed at the bottom of the battery 21, for conducting the heat released by the battery 21; the heat dissipation pipeline 43 is communicated between the liquid cooling unit 41 and the liquid cooling plate 42, for circulating the cooling medium to take away the heat released by the battery 21, which includes a first pipeline extending along the height direction of the energy storage device, a second pipeline extending along the width direction of the energy storage device, and a third pipeline connected between the first pipeline and the cooling pump, the first pipeline is connected between the third pipeline and the second pipeline, the second pipeline is connected between the first pipeline and the liquid cooling plate 42, so that the circulation flow of the cooling medium in the energy storage device can be realized.

[0039] In this embodiment, in order to meet the demand of the power grid or load, the energy storage device further comprises an energy storage converter 5 installed in the energy storage cabinet 1. Specifically, the energy storage converter 5 is arranged from top to bottom on the left side of the energy storage cabinet 1, and the energy storage unit 2 and the fire-fighting module 3 are arranged on the right side of the energy storage cabinet 1, and the energy storage converter 5 is electrically connected between the energy storage unit 2 and the power grid. It should be noted that the basic function of the energy storage converter 5 is to convert the direct current of the battery 21 into alternating current compatible with the power grid when the energy storage device is discharging; and to convert the alternating current of the power grid into direct current compatible with the battery 21 to store electrical energy when the energy storage device is charging. In some embodiments, in order to ensure the reliability and efficiency of the energy storage device, the number of energy storage converters 5 can be more than one. In this embodiment, the number of energy storage converters 5 is three, and the three energy storage converters 5 are used to control the charging and discharging process of the energy storage unit 2.

[0040] Further, in order to ensure the safe and efficient operation of the energy storage unit 2 during charging and discharging, the energy storage device further comprises a battery management system 6 for real-time monitoring and management of the energy storage unit 2. Specifically, the battery management system 6 can include a master control unit, a slave control unit, an equalization module, and a high-voltage control unit, etc. Among them, the master control unit is responsible for processing data from each slave control unit, executing advanced control algorithms such as state estimation, fault diagnosis, charging strategy, etc., and communicating with other parts of the energy storage device; the slave control unit is responsible for monitoring a certain number of battery monomers or modules, collecting voltage, current and temperature data, and sending these information to the master control unit; the equalization module is responsible for balancing the energy in the battery pack, ensuring that the voltage and state of charge of all battery monomers are as consistent as possible; the high-voltage control unit is responsible for managing the high-voltage circuit of the battery pack, including battery cluster voltage / current acquisition, contactor control and protection, etc.

[0041] In this embodiment, in order to protect the battery 21, the energy storage device further comprises a battery box (not shown in the figure). The battery box is installed in the energy storage cabinet 1, and its shape is matched with the shape of the battery 21, so as to accommodate the battery 21, protect the battery 21 from collision, and insulate and waterproof the battery 21.

[0042] In this embodiment, the energy storage device further comprises a display screen 7 embedded in the cabinet door 11 of the energy storage cabinet 1. The display screen 7 is in communication connection with the fire-fighting module 3 of the energy storage device, so as to enable the maintenance personnel to intuitively check the operating state of the energy storage device.

[0043] In this embodiment, considering the shape of the energy storage unit 2 and the convenience of transportation, the energy storage cabinet 1 is a cuboid as a whole, and an accommodation space is formed inside, so as to facilitate the assembly of the energy storage unit 2, the fire-fighting module 3, the cooling system 4, the energy storage converter 5 and the battery management system 6 in the accommodation space.

[0044] Further, the energy storage cabinet 1 comprises horizontal partitions arranged parallel to the bottom surface of the energy storage cabinet 1 and vertical partitions arranged parallel to the side surface of the energy storage cabinet 1, so as to divide the accommodation space into a plurality of accommodation areas, which can be respectively referred to as a liquid cooling unit area, a converter area and an energy storage area. The liquid cooling unit area and the converter area are arranged side by side in the vertical direction, and the liquid cooling unit area is located above the converter area. The energy storage area is located on one side of the liquid cooling unit area and the converter area in the horizontal direction. This arrangement not only makes each component compact and reasonable, but also hinders the transmission of heat when the battery 21 in the energy storage area experiences thermal runaway, thereby reducing damage to adjacent components caused by the battery 21 experiencing thermal runaway.

[0045] Compared with the prior art, the energy storage device has the following beneficial effects:

[0046] The energy storage device of the present application comprises an energy storage cabinet 1, an energy storage unit 2 arranged in the energy storage cabinet 1, and a fire-fighting module 3 arranged in the energy storage cabinet 1 and used for early warning of the operation of the energy storage unit 2. The fire-fighting module 3 is controlled to perform different levels of early warning response according to a predetermined algorithm. When the energy storage device is operating, the temperature of the energy storage unit 2 and / or the gas concentration in the energy storage unit 2 can be monitored and warned in real time, so as to ensure that maintenance personnel can timely control the energy storage unit 2 before thermal runaway occurs. This is beneficial to solve the problem of high false alarm and missed alarm frequency of existing energy storage devices, and facilitates precise management of the operation of the energy storage device.

[0047] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art can easily think of changes or replacements 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 appended claims.

Claims

1. An energy storage device, characterized in that, The device includes an energy storage cabinet (1), an energy storage unit (2) and a fire protection module (3) disposed within the energy storage cabinet (1). The fire protection module (3) includes a detection component (31), an execution component (32), and a fire controller that is communicatively connected to the detection component (31) and the execution component (32). The detection component (31) includes at least one of a temperature sensor for detecting the temperature of the energy storage unit (2) and a gas sensor for detecting the gas concentration inside the energy storage unit (2). The fire controller is used to analyze the information detected by the detection component (31) and control the execution component (32) to perform an early warning response.

2. The energy storage device as described in claim 1, characterized in that, The execution component (32) includes an alarm (321), an explosion-proof valve, a fire-fighting pipeline (322), and a puncture valve (323). The alarm (321) is used for a first-level early warning response, the explosion-proof valve is used for a second-level early warning response, and the fire-fighting pipeline (322) and the puncture valve (323) are used for a third-level early warning response.

3. The energy storage device as described in claim 1, characterized in that, The energy storage unit (2) includes a battery (21), which includes multiple cells with a capacity greater than or equal to 314Ah.

4. The energy storage device as described in claim 3, characterized in that, There are multiple batteries (21), and the multiple batteries (21) are arranged along the height direction of the energy storage cabinet.

5. The energy storage device as described in claim 1, characterized in that, The energy storage device also includes a cooling system (4), which includes a liquid cooler unit (41), a liquid cooling plate (42) located outside the energy storage unit (2), and a heat dissipation pipe (43) for the flow of cooling medium.

6. The energy storage device as described in claim 1, characterized in that, The energy storage device also includes an energy storage converter (5) for controlling the charging and discharging process of the energy storage unit (2).

7. The energy storage device as described in claim 1, characterized in that, The energy storage device also includes a battery management system (6) for real-time monitoring and management of the energy storage unit (2).

8. The energy storage device as described in claim 1, characterized in that, The energy storage cabinet (1) has a storage space inside, and the energy storage cabinet (1) includes a horizontal partition that is parallel to the bottom surface of the energy storage cabinet (1) and a vertical partition that is parallel to the side surface of the energy storage cabinet (1). The energy storage cabinet (1) divides the storage space into multiple storage areas through the horizontal partition and the vertical partition.

9. The energy storage device as described in claim 8, characterized in that, The plurality of accommodating areas include a liquid chiller area, a converter area, and an energy storage area, wherein the liquid chiller area and the converter area are arranged side by side in the vertical direction, and the energy storage area is located on one side of the liquid chiller area and the converter area in the horizontal direction.

10. The energy storage device as described in claim 1, characterized in that, The energy storage device has a capacity greater than or equal to 783 kWh.

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