Battery energy storage device and battery energy storage temperature control system

Abstract

The application provides a battery energy storage device and a battery energy storage temperature control system, which comprise a cabinet body and a battery mechanism arranged in the cabinet body, the battery mechanism and an inner wall of the cabinet body have a first channel, and a heat exchanger is arranged in the cabinet body; thus, the cabinet body is controlled in temperature through the heat exchanger, and the service life of the battery is significantly prolonged.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, specifically to a battery energy storage device and a battery energy storage temperature control system. Background Technology

[0002] Currently, stationary battery energy storage systems typically adopt a standard cabinet structure, which integrates battery modules (PACK), battery management system (BMS), energy management system (EMS), thermal management system (cooling / heating), fire protection system, and converter (PCS).

[0003] In thermal management systems (cooling / heating), uneven temperature management is a problem: batteries are extremely sensitive to temperature and require operation within an optimal temperature range (typically 20-30°C). However, the narrow space of a container and the large number of battery cells make ensuring uniform temperature for each cell a significant challenge. Traditional air-cooling or liquid-cooling solutions suffer from uneven temperature distribution within the container, leading to excessive temperature differences between batteries (e.g., >5°C), accelerating inconsistent aging of the battery pack, and affecting overall capacity and lifespan. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a battery energy storage device and a battery energy storage temperature control system that have uniform temperature, high safety and high system efficiency.

[0005] The technical problem to be solved by this invention is addressed by the following technical solution: A battery energy storage device includes a cabinet and a battery mechanism disposed inside the cabinet. The battery mechanism has a first channel with the inner wall of the cabinet, and a heat exchanger is provided inside the cabinet.

[0006] In one embodiment, the battery mechanism includes at least two sets of parallel first battery components and second battery components, with a second channel between the first battery components and the second battery components.

[0007] In one embodiment, the first battery assembly includes a plurality of first battery packs arranged vertically; a third channel exists between two first battery packs, wherein a first end of the third channel is connected to the first channel and a second end is connected to the second channel; The second battery assembly includes several second battery packs arranged vertically, and a fourth channel exists between two second battery packs. The first end of the fourth channel is connected to the first channel, and the second end is connected to the second channel.

[0008] In one embodiment, the battery energy storage device further includes an air circulation module, which includes a plurality of first fans and a plurality of second fans located in the second channel. The first fans are located at one end of the third channel facing the second battery assembly, and the second fans are located at one end of the fourth channel facing the first battery assembly.

[0009] In one embodiment, a first temperature sensor is provided inside the cabinet; a second temperature sensor is provided inside the first battery pack; and a third temperature sensor is provided inside the second battery pack.

[0010] In one embodiment, the battery energy storage device further includes an air exchange module for exchanging the air inside the cabinet with the outside air.

[0011] The technical problem to be solved by this invention is addressed by the following technical solution: A battery energy storage temperature control system includes a central processing unit, wherein a first temperature sensor, a heat exchanger, and an air circulation module are all electrically connected to the central processing unit; the central processing unit is used for: The system determines whether the temperature value of the cabinet obtained by the first temperature sensor has reached the preset temperature value, and controls the operation of the heat exchanger and the air circulation module to heat or cool the battery mechanism inside the cabinet based on the determination result.

[0012] In one embodiment, the central processing unit is further configured to: If the temperature of the cabinet is lower than the preset temperature value, the heat exchanger is controlled to start the heating mode so that the temperature of the battery mechanism inside the cabinet reaches the preset temperature value; at the same time, the temperature of the first battery pack is obtained by the second temperature sensor to control the speed of the first fan, and the temperature of the second battery pack is obtained by the third temperature sensor to control the speed of the second fan, so that the temperature of the first battery pack and the second battery pack are both greater than or less than the preset temperature value by 3°C.

[0013] In one embodiment, the central processing unit is further configured to: If the temperature of the cabinet is higher than the preset temperature value, the heat exchanger is controlled to start the cooling mode so that the temperature of the battery mechanism inside the cabinet reaches the preset temperature value; at the same time, the temperature of the first battery pack is obtained by the second temperature sensor to control the speed of the first fan, and the temperature of the second battery pack is obtained by the third temperature sensor to control the speed of the second fan, so that the temperature of the first battery pack and the second battery pack are both greater than or less than the preset temperature value by 3°C.

[0014] In one embodiment, the central processing unit is connected to an external temperature sensor for acquiring external temperature; the central processing unit is further configured to: The external temperature detected by the external temperature sensor is compared with the temperature value of the cabinet to obtain a comparison result, and it is determined whether the temperature value of the cabinet obtained by the first temperature sensor reaches the preset temperature value to obtain a judgment result. Based on the comparison and judgment results, control the operation of the heat exchanger and air circulation module to heat or cool the battery mechanism inside the cabinet; or control the operation of the air replacement module and air circulation module to heat or cool the battery mechanism inside the cabinet.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This application utilizes a battery mechanism installed inside a cabinet, with a first channel between the battery mechanism and the inner wall of the cabinet, and a heat exchanger installed inside the cabinet; thereby, the temperature of the cabinet is controlled by the heat exchanger, which significantly extends the battery life.

[0016] 2. In this application, the first temperature sensor, heat exchanger, first fan, and second fan are all electrically connected to the central processing unit. The central processing unit is used to: determine whether the temperature value of the cabinet obtained by the first temperature sensor has reached the preset temperature value, and control the operation of the heat exchanger and the air circulation module to heat or cool the battery mechanism inside the cabinet according to the determination result; thereby optimizing thermal management energy consumption and improving the overall energy efficiency of the system. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of the side sectional structure; Figure 3 For the present invention Figure 2 A magnified structural diagram of part A in the diagram; Figure 4 For the present invention Figure 2 Exploded structural diagrams of the first and second battery packs in the diagram; Figure 5 For the present invention Figure 4 A schematic diagram of the structure without the cover plate; Figure 6 For the present invention Figure 4 Overall structural diagram; Figure 7 This is a schematic diagram of the system flow of Embodiment 2 of the present invention.

[0018] In the diagram: 10. Cabinet; 20. Battery mechanism; 21. First battery pack; 22. Third channel; 23. First fan; 26. Second battery pack; 27. Fourth channel; 28. Second fan; 30. First channel; 35. Second channel; 40. Heat exchanger; 50. Housing; 60. Cover plate; 70. First through hole; 100. Battery cell compartment; 110. First thermally conductive silicone plate; 120. Battery cell; 125. Connecting aluminum busbar; 130. Second thermally conductive silicone plate; 200. Electrical component compartment; 210. Control board; 220. High current socket; 230. Communication socket; 240. Pressure relief valve; 250. Maintenance switch; 300. Pressure plate; 310. Second through hole; 320. Nut; 400. Pull rod. Detailed Implementation

[0019] To better understand the above technical solutions, exemplary embodiments of this disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art.

[0020] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0021] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the coordinate system shown in the accompanying drawings. They are used only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0022] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Example 1 like Figure 1-3 As shown, this embodiment includes a cabinet 10; in this embodiment, the front end of the cabinet 10 is provided with an openable cabinet door, the cabinet door is connected to the cabinet 10 by a hinge, and the cabinet door is provided with a handle for easy opening and closing by the user.

[0026] A battery mechanism 20 is installed inside the cabinet 10. The battery mechanism 20 and the inner wall of the cabinet 10 have a first channel 30. Specifically, the battery mechanism 20 and at least one of the six surfaces inside the cabinet 10 form the first channel 30.

[0027] In this embodiment, the gaps between the battery mechanism 20 and the inner walls of the cabinet 10 (upper, lower, left, right, front, and back) form the first channel 30. These gaps are evenly distributed to ensure smooth airflow, and the gaps between the battery mechanism 20 and the inner walls of the cabinet 10 (upper, lower, left, right, front, and back) are interconnected to form a gas circulation flow.

[0028] The cabinet 10 is equipped with a heat exchanger 40, which is used to cool or heat the inside of the cabinet 10 to regulate the temperature of the cabinet 10. In this embodiment, there are four heat exchangers 40, which are located at the top four corners of the cabinet 10 so that the hot and cold airflows can be evenly diffused along the first channel 30 to improve the temperature control efficiency.

[0029] In this embodiment, an external heat exchanger is also provided on the outside of the cabinet 10; the external heat exchanger and the four heat exchangers 40 are connected to form a central air conditioner to heat or cool the battery mechanism 20 inside the cabinet 10.

[0030] The battery mechanism 20 includes at least two sets of parallel first battery components and second battery components, with a second channel 35 between the first battery components and the second battery components. The second channel 35 extends along the height direction of the first battery components and the second battery components, forming a vertical ventilation path, and the upper and lower ends of the second channel 35 are connected to the first channel 30. Thus, the second channel 35 can quickly dissipate the heat of the first battery components and the second battery components in the vertical direction, forming a complete air circulation system with the first channel 30, effectively reducing the operating temperature of the first battery components and the second battery components, and improving heat dissipation efficiency.

[0031] The first battery assembly includes several first battery packs 21 arranged vertically. A third channel 22 exists between two first battery packs 21. The first end of the third channel 22 is connected to the first channel 30, and the second end is connected to the second channel 35. The second battery assembly includes several second battery packs 26 arranged vertically. A fourth channel 27 exists between two second battery packs 26. The first end of the fourth channel 27 is connected to the first channel 30, and the second end is connected to the second channel 35. Thus, during heat dissipation, the third channel 22 and the fourth channel 27 respectively quickly guide the heat generated by the first battery pack 21 and the second battery pack 26 into the second channel 35, and then through the first channel 30 to achieve efficient heat dissipation, forming a circulating heat dissipation.

[0032] During cooling, the third channel 22 and the fourth channel 27 can quickly introduce the cold air from the first channel 30 into the second channel 35, and then achieve efficient cooling through the first channel 30, forming a circulating cooling system.

[0033] In this embodiment, both the first battery pack 21 and the second battery pack 26 are installed inside the cabinet 10 through partitions. The two ends of the partitions are installed inside the cabinet 10 through support columns, and there is a gap between the bottom partition and the bottom of the cabinet 10. This gap is one of the first channels 30.

[0034] In this embodiment, the partition is provided with a guide rail assembly and a positioning buckle. The positioning buckle is used to fix the position of the first battery pack 21 or the second battery pack 26 on the partition. The guide rail assembly is used for sliding the first battery pack 21 or the second battery pack 26 on the partition along the guide rail for easy maintenance and replacement. The guide rail assembly and the positioning buckle work together to ensure that the first battery pack 21 and the second battery pack 26 are stable in position during operation, avoiding poor contact or structural displacement due to vibration.

[0035] When a battery pack malfunctions, it can be replaced or repaired simply by pulling out the corresponding first battery pack 21 or second battery pack 26 along the guide rail. The operation is convenient and does not affect the normal operation of other modules.

[0036] In this embodiment, the overall layout of the first battery assembly is symmetrically distributed with the overall layout of the second battery assembly, thereby ensuring the internal mass balance and airflow symmetry of the cabinet 10.

[0037] like Figure 4-6 As shown, both the first battery pack 21 and the second battery pack 26 include a housing 50; in this embodiment, the housing 50 is formed by bending and welding a 1.2mm thick Q235 steel plate through sheet metal processing.

[0038] The enclosure 50 is equipped with a pressure plate 300 that divides the interior of the enclosure 50 into a battery cell compartment 100 and an electrical component compartment 200; the pressure plate 300 is fixedly installed inside the enclosure 50 by a tie rod assembly.

[0039] The battery cell compartment 100 is provided with a first thermally conductive silicone plate 110, the thermal conductivity of the first thermally conductive silicone plate 110 is not less than 2.0 W / m·K; in this embodiment, the thickness of the first thermally conductive silicone plate 110 is 1 mm; the 1 mm thick first thermally conductive silicone plate 110 is attached to the bottom of the battery cell compartment 100; and the thermal conductivity of the first thermally conductive silicone plate 110 is 2.0 W / m·K.

[0040] A battery cell 120 is mounted on a first thermally conductive silicone plate 110, and a second thermally conductive silicone plate 130 is mounted on the battery cell 120. A connecting aluminum busbar 125 is mounted on the battery cell 120, and the connecting aluminum busbar 125 is electrically connected to the electrode post on the battery cell 120 by laser welding. In this embodiment, the thickness of the connecting aluminum busbar 125 is 2.5 mm. The battery cell 120 consists of 30 square 314Ah lithium iron phosphate cells.

[0041] The thermal conductivity of the second thermally conductive silicone plate 130 is not less than 2.0 W / m·K; in this embodiment, the thermal conductivity of the second thermally conductive silicone plate 130 is 2.0 W / m·K.

[0042] The housing 50 is provided with a cover plate 60, which is attached to the surface of the second thermally conductive silicone plate 130 and fixedly connected to the housing 50 by bolts; and the thickness of the first thermally conductive silicone plate 110 is less than the thickness of the second thermally conductive silicone plate 130; in this embodiment, the thickness of the second thermally conductive silicone plate 130 is 2mm; after the cover plate 60 is fixedly connected to the housing 50, the second thermally conductive silicone plate 130 undergoes appropriate compression deformation with the upper surface of the connecting aluminum strip 125 under the action of bolt pre-tightening force, thereby achieving a tight face-to-face fit and ensuring that the contact thermal resistance of the thermal interface is minimized.

[0043] In this embodiment, the housing 50 includes a bottom plate, a first side plate, a second side plate, a first horizontal plate, and a second horizontal plate.

[0044] The housing 50 has at least four first through holes 70 on the side away from the electrical component compartment 200, specifically, the four first through holes 70 are opened on the first horizontal plate surface; the pressure plate 300 has at least four second through holes 310 corresponding to the at least four first through holes 70; the pull rod assembly includes at least four pull rods 400, and both ends of the four pull rods 400 are threaded; one end of the at least four pull rods 400 passes through the first through hole 70 and the second through hole 310 respectively and is locked to both ends of the pull rods 400 by nuts 320.

[0045] In this embodiment, four first through holes 70 are provided on the rear end face of the housing 50 away from the electrical component compartment 200. Specifically, the four first through holes 70 are quadrilateral and located on the first horizontal plate. The pressure plate 300 is provided with four second through holes 310 corresponding to the four first through holes 70. The pull rod assembly includes at least four pull rods 400, and both ends of the four pull rods 400 are threaded. One end of each of the four pull rods 400 passes through the first through hole 70 and the second through hole 310 respectively and is locked to both ends of the pull rods 400 by nuts 320. This generates a clamping force to firmly press and fix the battery cell 120 into the battery cell compartment 100 inside the housing.

[0046] In this embodiment, the tie rod assembly also includes two symmetrical connecting plates, which are parallel to the first side plate and the second side plate, respectively, and the upper and lower ends of the connecting plates are welded to four tie rods. Specifically, every two tie rods are welded to the upper and lower ends of the connecting plates. Thus, the four tie rods and the two connecting plates constitute the tie rod assembly.

[0047] In this embodiment, the first and second side plates of the housing 50 are provided with through holes corresponding to the two ends of the pressure plate 300, so that the screws pass through the through holes on the first and second side plates and are fixedly connected to the two ends of the pressure plate 300; thereby preventing the two ends of the pressure plate 300 from being squeezed and deformed when the battery cell 120 bulges.

[0048] The pressure plate 300 is arranged along the width direction of the cell compartment 100; and the pressure plate 300 is made of metal.

[0049] The electrical component compartment 200 is equipped with a control board 210, a high-current socket 220, a communication socket 230, a pressure relief valve 240, and a maintenance switch 250. One end of each of the high-current socket 220, communication socket 230, pressure relief valve 240, and maintenance switch 250 extends out of the housing 50. In this embodiment, the electrical component compartment 200 is also equipped with an external interface and low-voltage control components. Thus, the electrical component compartment 200 and the cell compartment 100 achieve functional and safety isolation, ensuring a compact structure while significantly improving the safety and maintainability of the battery pack.

[0050] The cabinet 10 is equipped with a first temperature sensor; in this embodiment, there are several first temperature sensors, which are used to monitor the temperature of the cabinet 10 in real time and feed it back to the central processing unit.

[0051] In this embodiment, a second temperature sensor is provided in the first battery pack 21, and a third temperature sensor is provided in the second battery pack 26. The second temperature sensor is used to monitor the internal temperature change of the first battery pack 21 in real time, and the third temperature sensor is used to monitor the internal temperature change of the second battery pack 26 in real time. All temperature data are uploaded to the central processing unit for analysis and processing.

[0052] The battery energy storage device also includes an air circulation module, which comprises several first fans 23 and several second fans 28 located within the second channel 35. The first fans 23 are located on the end of the third channel 22 facing the second battery assembly; the second fans 28 are located on the end of the fourth channel 27 facing the first battery assembly. In this embodiment, the speed of the first fans 23 and second fans 28 is intelligently adjusted by the central processing unit based on temperature feedback from each battery pack, achieving on-demand airflow. When the internal temperature distribution of the first battery pack 21 or the second battery pack 26 is uneven, the corresponding fan automatically adjusts its airflow to enhance the convective heat dissipation efficiency of the high-temperature area.

[0053] In this embodiment, the first fan 23 and the second fan 28 are both separately mounted on the partition.

[0054] The battery energy storage device also includes a central processing unit. The heat exchanger 40, the first temperature sensor, the second temperature sensor, the third temperature sensor, and the air circulation module are all electrically connected to the central processing unit. The central processing unit dynamically adjusts the working power of the heat exchanger 40 and the air speed of the air circulation module based on the real-time temperature data collected by each temperature sensor to achieve precise temperature control. When any abnormal temperature is detected in any battery pack, forced cooling is immediately activated or the power supply to the faulty module is cut off to ensure the safe and stable operation of the system.

[0055] Thus, a first channel 30, a second channel 35, a third channel 22, and a fourth channel 27 are formed within the cabinet 10; a first fan 23 is provided at the end of the third channel 22 facing the second battery assembly; and a second fan 28 is provided at the end of the fourth channel 27 facing the first battery assembly; thereby enabling multi-level and effective management of battery temperature uniformity and consistency, and effectively reducing energy consumption.

[0056] The battery energy storage device also includes an air exchange module, which is used to replace the air inside the cabinet 10 with the outside air; and the air exchange module is electrically connected to the central processing unit; in this embodiment, the air exchange module includes an air supply channel and an exhaust channel formed on the cabinet 10, both of which are connected to a fan to realize the introduction of fresh outside air and the exhaust of internal stale air. At the same time, the air exchange module also includes a high-efficiency filter to prevent external dust from entering the interior of the cabinet 10 and ensure a clean and stable operating environment for the battery mechanism 20.

[0057] In this embodiment, both the air supply channel and the exhaust channel are equipped with ball valves for controlling the ventilation or sealing of the air supply channel and the exhaust channel.

[0058] Therefore, compared with traditional air-cooled and liquid-cooled energy storage cabinets, this application utilizes the configuration of heat exchanger 40, first channel 30, second channel 35, third channel 22, fourth channel 27, first fan 23, and second fan 28 inside the cabinet 10 to effectively reduce the size of air-cooled equipment, increase the space available for battery placement, and increase energy storage power. Compared with liquid cooling, it can reduce the space occupied by the equipment by 1 / 3 and has no risk of leakage and short circuit.

[0059] It should be noted that if the temperature of a single first battery pack 21 or second battery pack 26 is too high, an alarm will be triggered, indicating that the first battery pack 21 or second battery pack 26 is damaged and needs to be replaced.

[0060] Example 2 like Figure 7 As shown, a battery energy storage device system adopts the battery energy storage device in Embodiment 1; it includes a central processing unit, and a first temperature sensor, a heat exchanger 40, and an air circulation module are all electrically connected to the central processing unit; the central processing unit is used for: The system determines whether the temperature value of the cabinet 10 obtained by the first temperature sensor has reached the preset temperature value, and controls the operation of the heat exchanger 40 and the air circulation module to heat or cool the battery mechanism 20 inside the cabinet 10 based on the determination result.

[0061] If the temperature of the cabinet 10 is lower than the preset temperature value, the heat exchanger 40 is controlled to start the heating mode so that the temperature of the battery mechanism 20 inside the cabinet 10 reaches the preset temperature value. At the same time, the temperature of the first battery pack 21 is obtained by the second temperature sensor to control the speed of the first fan 23, and the temperature of the second battery pack 26 is obtained by the third temperature sensor to control the speed of the second fan 28, so that the temperatures of the first battery pack 21 and the second battery pack 26 are both greater than or less than the preset temperature value by 3°C. That is, after the battery energy storage device is started, the central processing unit monitors the temperature change inside the cabinet 10 in real time through the first temperature sensor, and monitors the temperature changes inside the cabinet 10, the first battery pack 21, and the second battery pack 26 in real time through the second and third temperature sensors respectively; and determines whether the temperature inside the cabinet 10 deviates from the preset range of 20-30°C. like Figure 2 As shown, if the temperature of the cabinet 10 is lower than the preset temperature value, the heat exchanger 40 is controlled to start the heating mode. The hot air blown out by the four heat exchangers 40 in the cabinet 10 is circulated and transported along the first channel 30. The heat is then evenly introduced into the area where the first battery pack 21 and the second battery pack 26 are located through the third channel 22 and the fourth channel 27 connected to the first channel 30, so that the temperature of the first battery pack 21 and the second battery pack 26 in the cabinet 10 reaches the preset temperature value. At the same time, the central processing unit dynamically adjusts the speed of the first fan 23 and the second fan 28 according to the real-time temperature feedback from the second temperature sensor and the third temperature sensor to accelerate the flow of hot air and improve the heating efficiency. When the temperature in the cabinet 10 rises to the preset range, the heat exchanger 40 stops heating, and the first fan 23 and the second fan 28 continue to run at low speed to maintain a uniform temperature distribution.

[0062] In this embodiment, the second temperature sensor acquires the temperature of the first battery pack 21 and controls the speed of the first fan 23, and the third temperature sensor acquires the temperature of the second battery pack 26 and controls the speed of the second fan 28, so that the temperatures of the first battery pack 21 and the second battery pack 26 are both greater than or less than a preset temperature value within 3°C. That is, in the heating mode, if the temperature of a certain first battery pack 21 or a certain second battery pack 26 is still lower than that of other first battery packs 21 or second battery packs 26, the speed of the fan in the corresponding area is increased to enhance local airflow circulation and ensure that the temperature of the battery pack quickly rises back to the normal range (greater than or less than the preset temperature value within 3°C). At the same time, the central processing unit records abnormal temperature difference data for subsequent fault warning analysis.

[0063] If the temperature of cabinet 10 is higher than the preset temperature value, the heat exchanger 40 is controlled to start the cooling mode so that the temperature of battery mechanism 20 inside cabinet 10 reaches the preset temperature value; at the same time, the temperature of the first battery pack 21 is obtained by the second temperature sensor to control the speed of the first fan 23, and the temperature of the second battery pack 26 is obtained by the third temperature sensor to control the speed of the second fan 28, so that the temperature of the first battery pack 21 and the second battery pack 26 are both greater than or less than the preset temperature value by 3°C; that is, the central processing unit monitors the temperature change inside cabinet 10 in real time through the first temperature sensor, and monitors the temperature change inside the first battery pack 21 and the second battery pack 26 in real time through the second temperature sensor and the third temperature sensor, respectively; and determines whether the temperature inside cabinet 10 deviates from the preset range of 20-30°C. like Figure 2 As shown, if the temperature of the cabinet 10 is higher than the preset temperature value, the heat exchanger 40 is controlled to start the cooling mode. The cold air blown out by the four heat exchangers 40 in the cabinet 10 is circulated along the first channel 30. The cold air is then evenly introduced into the area where the first battery pack 21 and the second battery pack 26 are located through the third channel 22 and the fourth channel 27 connected to the first channel 30, so that the temperature of the first battery pack 21 and the second battery pack 26 in the cabinet 10 reaches the preset temperature value. At the same time, the central processing unit dynamically adjusts the speed of the first fan 23 and the second fan 28 according to the real-time temperature feedback from the second temperature sensor and the third temperature sensor to accelerate the flow of cold air and accelerate the cooling efficiency. When the temperature in the cabinet 10 rises to the preset range, the heat exchanger 40 stops cooling, and the first fan 23 and the second fan 28 continue to run at low speed to maintain a uniform temperature distribution.

[0064] In this embodiment, the second temperature sensor acquires the temperature of the first battery pack 21 and controls the speed of the first fan 23, and the third temperature sensor acquires the temperature of the second battery pack 26 and controls the speed of the second fan 28, so that the temperatures of the first battery pack 21 and the second battery pack 26 are both greater than or less than a preset temperature value within 3°C. That is, in cooling mode, if the temperature of a certain first battery pack 21 or a certain second battery pack 26 is still higher than that of other first battery packs 21 or second battery packs 26, the speed of the fan in the corresponding area is increased to enhance local airflow circulation and ensure that the temperature of the battery pack quickly rises to the normal range (greater than or less than the preset temperature value within 3°C). At the same time, the central processing unit records abnormal temperature difference data for subsequent fault warning analysis.

[0065] Example 3 The difference between this embodiment and embodiment 2 is that the central processing unit is connected to an external temperature sensor for acquiring the external temperature; the central processing unit is also used for: The external temperature detected by the external temperature sensor is compared with the temperature value of the cabinet 10 to obtain the comparison result, and it is determined whether the temperature value of the cabinet 10 obtained by the first temperature sensor reaches the preset temperature value to obtain the judgment result. Based on the comparison and judgment results, control the operation of heat exchanger 40 and air circulation module to heat or cool the battery mechanism 20 inside cabinet 10; or control the operation of air replacement module and air circulation module to heat or cool the battery mechanism 20 inside cabinet 10.

[0066] The working principle of this embodiment is as follows: After the battery energy storage device is started, the external temperature sensor collects the external temperature in real time, and the first sensor collects the internal temperature of the cabinet 10 in real time. The central processing unit compares the external temperature with the internal temperature of the cabinet 10, obtains the comparison result, and determines whether the temperature value of the cabinet 10 obtained by the first temperature sensor has reached the preset temperature value, and obtains the judgment result. When the external temperature is higher than the internal temperature of the cabinet 10, and the internal temperature of the cabinet is higher than the preset value, the central processing unit activates the cooling mode of the heat exchanger 40. The cold air blown out by the four heat exchangers 40 in the cabinet 10 circulates along the first channel 30; and through the third channel 22 and the fourth channel 27 connected to the first channel 30, the cold air is evenly introduced into the area where the first battery pack 21 and the second battery pack 26 are located, so that the temperature of the first battery pack 21 and the second battery pack 26 in the cabinet 10 reaches the preset temperature value; at the same time, the temperature of the first battery pack 21 is obtained by the second temperature sensor to control the speed of the first fan 23, and the temperature of the second battery pack 26 is obtained by the third temperature sensor to control the speed of the second fan 28, so that the temperature of the first battery pack 21 and the second battery pack 26 are both within 3°C of the preset temperature value; when the temperature inside the cabinet 10 rises to the preset range, the heat exchanger 40 stops cooling, and the first fan 23 and the second fan 28 continue to run at low speed to maintain a uniform temperature distribution.

[0067] In this embodiment, the second temperature sensor acquires the temperature of the first battery pack 21 and controls the speed of the first fan 23, and the third temperature sensor acquires the temperature of the second battery pack 26 and controls the speed of the second fan 28, so that the temperatures of the first battery pack 21 and the second battery pack 26 are both greater than or less than a preset temperature value within 3°C. That is, in cooling mode, if the temperature of a certain first battery pack 21 or a certain second battery pack 26 is still higher than that of other first battery packs 21 or second battery packs 26, the speed of the fan in the corresponding area is increased to enhance local airflow circulation and ensure that the temperature of that battery pack is quickly reduced to the normal range (greater than or less than the preset temperature value within 3°C). At the same time, the central processing unit records abnormal temperature difference data for subsequent fault warning analysis.

[0068] When the external temperature is higher than the internal temperature of the cabinet by 10 degrees, and the internal temperature of the cabinet is lower than the preset value, The air exchange module operates, delivering external air into the cabinet 10, and the internal air of the cabinet 10 is delivered to the outside. The incoming external air circulates along the first channel 30. External air is evenly introduced into the areas containing the first battery pack 21 and the second battery pack 26 via the third channel 22 and the fourth channel 27, which are connected to the first channel 30. The internal air in these areas is delivered to the outside via the second channel 35, ensuring that the temperature of the first battery pack 21 and the second battery pack 26 within the cabinet 10 reaches the preset temperature value. Simultaneously, the temperature of the first battery pack 21 is obtained by a second temperature sensor, controlling the speed of the first fan 23; the temperature of the second battery pack 26 is obtained by a third temperature sensor, controlling the speed of the second fan 28, ensuring that the temperatures of both the first battery pack 21 and the second battery pack 26 are within 3°C of the preset temperature value. Once the temperature inside the cabinet 10 reaches the preset range, the air exchange module, the first fan 23, and the second fan 28 continue to operate at low speed to maintain a uniform temperature distribution. In this embodiment, the second temperature sensor acquires the temperature of the first battery pack 21 and controls the speed of the first fan 23, and the third temperature sensor acquires the temperature of the second battery pack 26 and controls the speed of the second fan 28, so that the temperatures of the first battery pack 21 and the second battery pack 26 are both greater than or less than a preset temperature value within 3°C. That is, in the ventilation mode, if the temperature of a certain first battery pack 21 or a certain second battery pack 26 is still higher than that of other first battery packs 21 or second battery packs 26, the speed of the fan in the corresponding area is increased to enhance local airflow circulation and ensure that the temperature of the battery pack is quickly cooled down to the normal range (greater than or less than the preset temperature value within 3°C). At the same time, the central processing unit records abnormal temperature difference data for subsequent fault warning analysis.

[0069] When the external temperature is lower than the internal temperature of the cabinet 10, and the internal temperature of the cabinet is lower than the preset value, the central processing unit activates the heating mode of the heat exchanger 40. The hot air blown out by the four heat exchangers 40 in the cabinet 10 circulates along the first channel 30; and through the third channel 22 and the fourth channel 27 connected to the first channel 30, the heat is evenly introduced into the area where the first battery pack 21 and the second battery pack 26 are located, so that the temperature of the first battery pack 21 and the second battery pack 26 in the cabinet 10 reaches the preset temperature value; at the same time, the temperature of the first battery pack 21 is obtained by the second temperature sensor to control the speed of the first fan 23, and the temperature of the second battery pack 26 is obtained by the third temperature sensor to control the speed of the second fan 28, so that the temperature of the first battery pack 21 and the second battery pack 26 are both within 3°C of the preset temperature value; when the temperature inside the cabinet 10 rises to the preset range, the heat exchanger 40 stops heating, and the first fan 23 and the second fan 28 continue to run at low speed to maintain a uniform temperature distribution.

[0070] In this embodiment, the second temperature sensor acquires the temperature of the first battery pack 21 and controls the speed of the first fan 23, and the third temperature sensor acquires the temperature of the second battery pack 26 and controls the speed of the second fan 28, so that the temperatures of the first battery pack 21 and the second battery pack 26 are both greater than or less than a preset temperature value within 3°C. That is, in the heating mode, if the temperature of a certain first battery pack 21 or a certain second battery pack 26 is still lower than that of other first battery packs 21 or second battery packs 26, the speed of the fan in the corresponding area is increased to enhance local airflow circulation and ensure that the temperature of the battery pack quickly rises back to the normal range (greater than or less than the preset temperature value within 3°C). At the same time, the central processing unit records abnormal temperature difference data for subsequent fault warning analysis.

[0071] When the external temperature is lower than the internal temperature of the cabinet, and the internal temperature of the cabinet is higher than the preset value; The air exchange module operates, delivering external air into the cabinet 10, and the air in the cabinet 10 is then delivered to the outside. The incoming external air circulates along the first channel 30. External air is evenly introduced into the areas containing the first battery pack 21 and the second battery pack 26 via the third channel 22 and the fourth channel 27, which are connected to the first channel 30. The internal air in these areas is then delivered to the outside via the second channel 35, ensuring that the temperatures of the first battery pack 21 and the second battery pack 26 within the cabinet 10 reach preset temperature values. Simultaneously, the temperature of the first battery pack 21 is obtained by a second temperature sensor, controlling the speed of the first fan 23; the temperature of the second battery pack 26 is obtained by a third temperature sensor, controlling the speed of the second fan 28. This ensures that the temperatures of both the first battery pack 21 and the second battery pack 26 are within 3°C of the preset temperature value. Once the temperature inside the cabinet 10 reaches the preset range, the air exchange module, the first fan 23, and the second fan 28 continue to operate at low speeds to maintain a uniform temperature distribution.

[0072] In this embodiment, the second temperature sensor acquires the temperature of the first battery pack 21 and controls the speed of the first fan 23, and the third temperature sensor acquires the temperature of the second battery pack 26 and controls the speed of the second fan 28, so that the temperatures of the first battery pack 21 and the second battery pack 26 are both greater than or less than a preset temperature value within 3°C. That is, in the ventilation mode, if the temperature of a certain first battery pack 21 or a certain second battery pack 26 is still lower than that of other first battery packs 21 or second battery packs 26, the speed of the fan in the corresponding area is increased to enhance local airflow circulation and ensure that the temperature of the battery pack is quickly cooled down to the normal range (greater than or less than the preset temperature value within 3°C). At the same time, the central processing unit records abnormal temperature difference data for subsequent fault warning analysis.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the technical solutions of the present invention have been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A battery energy storage device, characterized in that: Includes a cabinet (10) and a battery mechanism (20) disposed in the cabinet (10). The battery mechanism (20) has a first channel (30) with the inner wall of the cabinet (10). A heat exchanger (40) is provided in the cabinet (10).

2. The battery energy storage device according to claim 1, characterized in that: The battery assembly (20) includes at least two sets of parallel first battery components and second battery components, with a second channel (35) between the first battery components and the second battery components.

3. The battery energy storage device according to claim 2, characterized in that: The first battery assembly includes a plurality of first battery packs (21) arranged vertically; a third channel (22) exists between two first battery packs (21), and the first end of the third channel (22) is connected to the first channel (30) and the second end is connected to the second channel (35); The second battery assembly includes a plurality of second battery packs (26) arranged vertically, and a fourth channel (27) exists between two second battery packs (26). The first end of the fourth channel (27) is connected to the first channel (30), and the second end is connected to the second channel (35).

4. The battery energy storage device according to claim 3, characterized in that: The battery energy storage device further includes an air circulation module, which includes a plurality of first fans (23) and a plurality of second fans (28) located in the second channel (35). The first fans (23) are located on one end of the third channel (22) facing the second battery assembly; the second fans (28) are located on one end of the fourth channel (27) facing the first battery assembly.

5. The battery energy storage device according to claim 4, characterized in that: The cabinet (10) is equipped with a first temperature sensor; the first battery pack (21) is equipped with a second temperature sensor; and the second battery pack (26) is equipped with a third temperature sensor.

6. The battery energy storage device according to claim 5, characterized in that: The battery energy storage device also includes an air exchange module, which includes an air supply channel and an exhaust channel opened on the cabinet (10), and a fan is provided on both the air supply channel and the exhaust channel.

7. A battery energy storage temperature control system for a battery energy storage device according to any one of claims 1-6, characterized in that: The system includes a central processing unit, and the first temperature sensor, heat exchanger (40), and air circulation module are all electrically connected to the central processing unit; the central processing unit is used for: Determine whether the temperature value of the cabinet (10) obtained by the first temperature sensor has reached the preset temperature value, and control the heat exchanger (40) and the air circulation module to heat or cool the battery mechanism (20) inside the cabinet (10) according to the determination result.

8. The battery energy storage temperature control system according to claim 7, characterized in that: The central processing unit is also used for: If the temperature of the cabinet (10) is lower than the preset temperature value, the heat exchanger (40) is controlled to start the heating mode so that the temperature of the battery mechanism (20) inside the cabinet (10) reaches the preset temperature value; at the same time, the temperature of the first battery pack (21) is obtained by the second temperature sensor to control the speed of the first fan (23), and the temperature of the second battery pack (26) is obtained by the third temperature sensor to control the speed of the second fan (28), so that the temperatures of the first battery pack (21) and the second battery pack (26) are both greater than or less than the preset temperature value by 3°C.

9. The battery energy storage temperature control system according to claim 7, characterized in that: The central processing unit is also used for: If the temperature of the cabinet (10) is higher than the preset temperature value, the heat exchanger (40) is controlled to start the cooling mode so that the temperature of the battery mechanism (20) inside the cabinet (10) reaches the preset temperature value; at the same time, the temperature of the first battery pack (21) is obtained by the second temperature sensor to control the speed of the first fan (23), and the temperature of the second battery pack (26) is obtained by the third temperature sensor to control the speed of the second fan (28), so that the temperatures of the first battery pack (21) and the second battery pack (26) are both greater than or less than the preset temperature value by 3°C.

10. The battery energy storage temperature control system according to claim 7, characterized in that: The central processing unit is connected to an external temperature sensor for acquiring the external temperature; the central processing unit is also used for: The external temperature detected by the external temperature sensor is compared with the temperature value of the cabinet (10) to obtain the comparison result, and it is determined whether the temperature value of the cabinet (10) obtained by the first temperature sensor reaches the preset temperature value to obtain the judgment result. Based on the comparison and judgment results, control the operation of the heat exchanger (40) and the air circulation module to heat or cool the battery mechanism (20) inside the cabinet (10); or control the operation of the air replacement module and the air circulation module to heat or cool the battery mechanism (20) inside the cabinet (10).

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