Multi-battery pack energy storage system water chilling unit and energy storage cabinet applied by same

Abstract

The utility model discloses a multi-battery pack energy storage system water cooling unit and an energy storage cabinet applied by the same, a plurality of circulating water cooling pipelines connected in parallel are adopted, and each battery pack is correspondingly distributed with one independently controlled circulating water cooling pipeline; a circulating pump, a flow regulating valve, a heater and a heat exchanger are arranged on each circulating water cooling pipeline in series; a water inlet and a water outlet of each circulating water cooling pipeline are respectively butted to the liquid cooling unit of the corresponding battery pack; each battery pack is provided with a temperature sensor, the liquid cooling unit corresponding to each battery pack is provided with a pressure sensor, the water cooling unit further comprises a liquid cooling controller, and the input end of the liquid cooling controller is in communication connection with the temperature sensors and the pressure sensors of all the battery packs and the liquid cooling units. And the output end is in communication connection with the circulating pump, the flow regulating valve and the heater on the circulating water cooling pipeline corresponding to each battery pack. According to the utility model, balanced temperature control among the multiple battery packs of the energy storage system is realized, and the reliability of the whole system is improved.

Description

Technical Field

[0001] The utility model relates to a water cooling unit of a multi-battery pack energy storage system and an energy storage cabinet applied thereto, belonging to a battery temperature control technology for an energy storage system. Background Art

[0002] In the existing energy storage system, in order to effectively dissipate the heat of the battery pack, a water cooling unit is usually used as the main heat dissipation device. The design of the water cooling unit generally includes two main functions: cooling and heating, to meet the heat dissipation needs in different seasons and environments. In the cooling mode, the water cooling unit absorbs the heat generated by the battery through circulating water and transfers it to the refrigerant. After absorbing the heat, the refrigerant transfers the heat to the external environment through compression, condensation, expansion and other processes, thereby achieving heat dissipation of the battery. In this process, the water cycle and the refrigerant cycle are independent of each other but cooperate with each other. The water cycle is usually composed of a water pump and a heater, which is responsible for transporting cooling water to the surface of the battery and taking away the absorbed heat. The refrigerant cycle is composed of a compressor, a condenser and an electronic expansion valve, which is responsible for transferring the absorbed heat to the external environment. Heat exchange is carried out between the two cycles through a heat exchanger to achieve efficient heat dissipation. In addition to the cooling function, the water cooling unit also has a heating function. In the heating mode, the system heats the circulating water through an electric heater and then transports the hot water to the area that needs heating. This design enables the water-cooling unit to be flexibly adjusted according to actual needs to meet the heat dissipation and heating requirements in different scenarios.

[0003] As energy storage systems place higher and higher demands on battery capacity, more and more battery packs are integrated into a single energy storage device. More than two battery packs will aggravate the internal temperature rise of the energy storage device, and will also cause the temperature radiation of adjacent battery packs to overlap and affect each other. Existing energy storage systems usually adopt a single-channel water cooling cycle design, which connects all battery packs in series or in parallel. This design cannot accurately control the temperature of each battery pack in the energy storage system, which can easily cause large temperature differences between different battery packs, affecting the performance and life of the battery. In addition, in a vertical energy storage cabinet, multiple battery packs are stacked and assembled at different heights inside the energy storage cabinet. The height potential energy difference of the battery packs will cause an imbalance in the circulating water pressure in the water circulation pipe, which further affects the stability and heat exchange efficiency of the water cooling unit of the energy storage system. Utility Model Content

[0004] The technical problem solved by the utility model is: in view of the problem that the existing single-channel water-cooling circulation pipeline is not suitable for a multi-battery pack energy storage system, a new multi-battery pack energy storage system water cooling unit and an energy storage cabinet used therein are provided.

[0005] The utility model is implemented by the following technical solutions:

[0006] The water cooling unit of the multi-battery pack energy storage system adopts multiple parallel circulating water cooling pipelines, and each battery pack is allocated an independently controlled circulating water cooling pipeline; a circulating pump, a flow regulating valve, a heater and a heat exchanger are arranged in series on each of the circulating water cooling pipelines, and are respectively connected to the two ends of the corresponding battery pack liquid cooling unit through the water inlet and outlet of the circulating water cooling pipeline; each of the battery packs is provided with a temperature sensor, and each liquid cooling unit corresponding to the battery pack is provided with a pressure sensor, and the water cooling unit also includes a liquid cooling controller, the input end of the liquid cooling controller is communicatively connected with the temperature sensors and pressure sensors of all battery packs and liquid cooling units, and the output end of the liquid cooling controller is communicatively connected with the circulating pump, flow regulating valve and heater on the circulating water cooling pipeline corresponding to each battery pack.

[0007] In the water cooling unit of the multi-battery pack energy storage system of the utility model, further, all circulating water cooling pipelines share the same heat exchanger.

[0008] In the water cooling unit of the multi-battery pack energy storage system of the utility model, further, the liquid cooling controller is communicatively connected with the local interaction module of the energy storage system.

[0009] In the water cooling unit of the multi-battery pack energy storage system of the utility model, further, the liquid cooling controller is also provided with a wireless communication module.

[0010] In the water cooling unit of the multi-battery pack energy storage system of the utility model, further, the liquid cooling controller is also communicatively connected with the BMS battery management system of the energy storage system through an external communication interface.

[0011] In the water cooling unit of the multi-battery pack energy storage system of the utility model, further, a Kalman filter calculation module is provided in the liquid cooling controller to perform filtering calculations on the battery pack temperature and circulating water pressure input into the liquid cooling controller at a fixed period.

[0012] In the water cooling unit of the multi-battery pack energy storage system of the utility model, further, the circulation pump adopts a variable frequency water pump, and the heater adopts a variable frequency heater.

[0013] In the water cooling unit of the multi-battery pack energy storage system of the utility model, it further includes a water-cooled power supply module, which is electrically connected to the liquid cooling controller and the circulating pump, flow regulating valve, heater and heat exchanger on the circulating water cooling pipeline.

[0014] The utility model also discloses an energy storage cabinet, which encapsulates and arranges at least two battery packs inside the energy storage cabinet, and includes the multi-battery pack energy storage system water cooling unit of the utility model to achieve temperature control of the multiple battery packs in the energy storage cabinet.

[0015] In the energy storage cabinet of the present invention, further, each group of battery packs is provided with a battery pack liquid cooling plate, the battery pack liquid cooling plate is provided with a liquid cooling cavity inside, and a liquid cooling plate water inlet and a liquid cooling plate water outlet outside, which are respectively connected to the circulating water outlet and the circulating water inlet of the corresponding battery pack circulating water cooling pipeline.

[0016] In the energy storage cabinet of the present invention, further, the multiple battery packs in the energy storage cabinet are stacked along the height of the cabinet, the battery pack liquid cooling unit is a battery pack liquid cooling plate attached to the bottom of the battery pack, and a liquid cooling control module is installed in the cabinet below the battery pack, which is used to centrally set the water cooling unit of the multi-battery pack energy storage system.

[0017] The utility model adopts the above technical solution to achieve the following beneficial effects:

[0018] (1) Multi-circuit water cooling pipeline control design. The utility model sets up a separate circulating water cooling pipeline for each battery pack, and each circulating water cooling pipeline is equipped with a variable frequency heater, a variable frequency water pump and a flow control valve. Each circulating water cooling pipeline can independently adjust the temperature of the corresponding battery pack, thereby achieving balanced temperature control of the multi-battery system. Compared with the traditional single-circuit water circulation design, the utility model simultaneously controls multiple circulating water cooling pipelines to independently adjust the temperature of each battery pack, which can more accurately control the operating temperature of each battery pack, reduce the temperature difference between battery packs, enhance the flexibility and adjustment ability of the energy storage system, and improve the overall performance and life of the energy storage system.

[0019] (2) Flow regulation to control temperature. The utility model adjusts the temperature of the battery pack by adjusting the flow regulating valve and the circulating pump, changing the flow rate of the circulating water in the circulating water cooling pipeline, adjusting the flow rate of the circulating water in the battery pack liquid cooling unit, and changing the heat exchange efficiency between the battery pack heat and the circulating water in the liquid cooling unit. In this way, not only can the temperature of the battery pack in the energy storage system be balanced, but also the pressure control in the circulating water cooling pipeline can be achieved for the battery packs that need to transport the circulating water to different installation heights in the energy storage cabinet, thereby ensuring the temperature control of the battery packs at different heights, and reducing the power consumption of the entire water cooling unit system compared to directly adjusting the heat exchanger in the circulating water cooling pipeline.

[0020] (3) High-precision circulating water pressure and battery temperature measurement. In order to correctly collect the battery pack temperature and circulating water pressure, the utility model samples the battery pack temperature and circulating water pressure at a fixed period, accurately calculates the circulating water pressure and battery temperature at the end of the period through the Kalman filter, and optimally estimates the system state through the system input and output data. The Kalman filter can reduce interference in the process of collecting battery pack temperature and circulating water pressure data, improve measurement accuracy and response speed, and better monitor and adjust the operating status of the system, thereby improving the stability and efficiency of the entire chiller system.

[0021] In summary, the utility model realizes balanced temperature control among multiple battery packs in the energy storage system through a multi-circulation water cooling pipeline design, reduces the power consumption of the multi-circulation water cooling pipelines, accurately calculates the battery pack temperature and circulating water pressure, improves the reliability of the entire system, and can be widely promoted and applied in multi-battery pack energy storage equipment.

[0022] The utility model is further described below in conjunction with the accompanying drawings and specific implementation plans. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the external structure of the energy storage cabinet of the embodiment.

[0024] Figure 2 Schematic diagram of the water cooling unit inside the liquid cooling control module of the embodiment.

[0025] Figure 3 Schematic diagram of each module of the water cooling unit of the multi-battery pack energy storage system of the embodiment.

[0026] Numbers in the figure: 100 - energy storage cabinet, 110 - first battery pack, 120 - second battery pack, 130 - third battery pack;

[0027] 210-first battery pack liquid cooling plate, 220-second battery pack liquid cooling plate, 230-third battery pack liquid cooling plate, 211-first liquid cooling plate water inlet, 212-first liquid cooling plate water outlet, 213-first circulation water outlet, 214-first circulation water inlet, 221-second liquid cooling plate water inlet, 222-second liquid cooling plate water outlet, 223-second circulation water outlet, 224-second circulation water inlet, 231-third liquid cooling plate water inlet, 232-third liquid cooling plate water outlet, 233-third circulation water outlet, 234-third circulation water inlet;

[0028] 300-liquid cooling control module, 311-first circulation pump, 312-second circulation pump, 313-third circulation pump, 321-first flow regulating valve, 322-second flow regulating valve, 323-third flow regulating valve, 331-first heater, 332-second heater, 333-third heater, 340-heat exchanger;

[0029] 400-liquid cooling controller, 411-first battery pack temperature sensor, 412-first liquid cooling plate pressure sensor, 421-second battery pack temperature sensor, 422-second liquid cooling plate pressure sensor, 431-third battery pack temperature sensor, 432-third liquid cooling plate pressure sensor, 440-wireless communication module, 450-external communication interface, 460-local interaction module;

[0030] 500-BMS battery management system;

[0031] 600-Water-cooled power module. DETAILED DESCRIPTION

[0032] Example

[0033] See also Figure 1 , Figure 2 and Figure 3 , the figure shows an energy storage cabinet with three groups of battery packs. The energy storage cabinet 100 is a specific implementation scheme of the water cooling unit of the multi-battery pack energy storage system of the utility model. In the energy storage cabinet 100, the upper three layers of the cabinet body are respectively provided with a first battery pack 110, a second battery pack 120 and a third battery pack 130. The first battery pack 110, the second battery pack 120 and the third battery pack 130 are stacked along the cabinet height direction of the energy storage cabinet. A liquid cooling plate is respectively provided at the bottom of each battery pack as a liquid cooling unit of the battery pack. The working temperature of the battery pack is adjusted by heat exchange of the battery pack, which includes cooling and heating the battery pack. The first battery pack liquid cooling plate 210 is in close contact with the bottom of the first battery pack 110, the second battery pack liquid cooling plate 220 is in close contact with the bottom of the second battery pack 120, and the third battery pack liquid cooling plate 230 is in close contact with the bottom of the third battery pack 130. A liquid cooling control module 300 is arranged inside the cabinet below the third battery pack liquid cooling plate 230. A water cooling unit for temperature regulation and control of the three battery packs above is centrally arranged inside the liquid cooling control module 300. The water cooling unit is provided with three groups of circulating water cooling pipelines corresponding to the first battery pack 110, the second battery pack 120 and the third battery pack 130, respectively. A liquid cooling cavity is arranged inside each battery pack liquid cooling plate. A liquid cooling plate water inlet and a liquid cooling plate water outlet are arranged at both ends of the liquid cooling cavity outside the energy storage cabinet, which are respectively connected with a circulating water outlet and a circulating water inlet of the corresponding battery pack circulating water cooling pipeline arranged outside the liquid cooling control module 300.

[0034] The water cooling unit of the multi-battery pack energy storage system of the present invention is described in detail below through the water cooling solution adopted by the energy storage cabinet in this embodiment.

[0035] For specific combination, see Figure 1 and Figure 2 The first liquid cooling plate water inlet 211 and the first liquid cooling plate water outlet 212 on the first battery pack liquid cooling plate 210 are respectively connected to the first circulating water outlet 213 and the first circulating water inlet 214 outside the liquid cooling control module 300 through pipelines, and the first circulating water cooling pipeline is arranged inside the liquid cooling control module 300 to form a loop, and the first circulating water cooling pipeline is provided with a first circulating pump 311, a first flow regulating valve 321, a first heater 331 and a heat exchanger 340; the second liquid cooling plate water inlet 221 and the second liquid cooling plate water outlet 222 on the second battery pack liquid cooling plate 220 are respectively connected to the second circulating water outlet 223 and the second circulating water inlet 224 outside the liquid cooling control module 300 through pipelines. The second circulating water cooling pipeline is arranged inside the liquid cooling control module 300 to form a loop, and a second circulating water cooling pipeline is provided with a second circulating pump 312, a second flow regulating valve 322, a second heater 332 and a heat exchanger 340; the third liquid cooling plate water inlet 231 and the third liquid cooling plate water outlet 232 on the third battery pack liquid cooling plate 230 are respectively connected with the third circulating water outlet 233 and the third circulating water inlet 234 outside the liquid cooling control module 300 through pipelines, and a third circulating water cooling pipeline is arranged inside the liquid cooling control module 300 to form a loop, and a third circulating water cooling pipeline is provided with a third circulating pump 313, a third flow regulating valve 323, a third heater 333 and a heat exchanger 340.

[0036] Among them, the circulating pump adopts a variable frequency water pump, which is used to accurately adjust the flow rate of the circulating water flowing under the battery pack, realize the rapid heat exchange between the circulating water and the battery pack, and adjust the circulating water pressure under the battery pack. The heater adopts a variable frequency electric heater, which accurately heats and raises the temperature of the circulating water according to actual needs, and heats and heats the battery pack. The flow control valve is used to adjust the flow of the circulating water. The regulating valve with controllable opening and closing degree is used to realize the flow rate of the circulating water flowing through the circulating water cooling pipeline. When it is necessary to slightly increase the circulating water pressure in the circulating water cooling pipeline, the flow rate can be increased to a certain extent by reducing the circulating water flow through the flow control valve, thereby increasing the pressure of the circulating water without increasing the output frequency of the water pump, so as to realize the low power consumption operation of the water pump. The three circulating water cooling pipelines correspond to three groups of battery packs respectively. Each battery pack has a corresponding variable frequency water pump, variable frequency electric heater and flow control valve, which can independently control the circulating water flow rate and battery pack temperature of each battery pack, so as to better meet the heat dissipation requirements of different battery packs.

[0037] The three battery packs of this embodiment use three parallel circulating water cooling pipelines. Each battery pack is assigned an independently controlled circulating water cooling pipeline. The water inlet and outlet of the circulating water cooling pipeline are connected to the water outlet and water inlet of the corresponding battery pack liquid cooling plate, respectively, to form a circulating water loop. A temperature sensor and a pressure sensor are set on each of the battery packs and their liquid cooling units to monitor the battery pack temperature and circulating water pressure. Figure 1 As shown, the first battery pack temperature sensor 411, the second battery pack temperature sensor 421 and the third battery pack temperature sensor 431 respectively monitor the battery operating temperature of the first battery pack 110, the second battery pack 120 and the third battery pack 130, and the first liquid cooling plate pressure sensor 412, the second liquid cooling plate pressure sensor 422 and the third liquid cooling plate pressure sensor 432 respectively monitor the pressure of the circulating water flowing through the first battery pack liquid cooling plate 210, the second battery pack liquid cooling plate 220 and the third battery pack liquid cooling plate 230. A liquid cooling controller 400 is also provided in the liquid cooling control module 300, such as Figure 3 As shown, the input end of the liquid cooling controller 400 is communicatively connected with the first battery pack temperature sensor 411, the second battery pack temperature sensor 421, the third battery pack temperature sensor 431 and the first liquid cooling plate pressure sensor 412, the second liquid cooling plate pressure sensor 422, and the third liquid cooling plate pressure sensor 432, and the output end is communicatively connected with the first circulation pump 311, the second circulation pump 312, the third circulation pump 313, the first flow regulating valve 321, the second flow regulating valve 322, the third flow regulating valve 323, the first heater 331, the second heater 332, and the third heater 333 on the circulating water cooling pipeline corresponding to each battery pack. By calculating the difference between the temperature of each battery pack and the circulating water pressure of the liquid cooling unit and their respective target values, the circulating pump power, flow regulation and heater power regulation are performed on the circulating water cooling pipeline corresponding to the battery pack, so as to realize precise and independent control of the temperature of multiple battery packs.

[0038] When the battery pack is in a low-temperature environment and needs to be heated when started, the liquid cooling controller controls the heater on the circulating water cooling pipeline corresponding to the battery pack through temperature sensor feedback to heat the circulating water in the circulating water cooling pipeline; when the temperature of the battery pack is too high during operation and the battery pack needs to be cooled, the liquid cooling controller controls the flow regulating valve and circulating pump corresponding to the battery pack through the temperature signal feedback of the temperature sensor, thereby increasing the flow rate and flow velocity of the circulating water flowing through the liquid cooling unit of the battery pack, and monitors the circulating water pressure in the circulating water cooling pipeline in real time through the pressure sensor to avoid overloading the circulating water cooling pipeline. At the same time, the adjusted circulating water flow rate can be obtained through the pressure sensor combined with the pipeline cross-sectional area.

[0039] like Figure 2As shown, the first circulating water cooling pipeline, the second circulating water cooling pipeline and the third circulating water cooling pipeline in this embodiment share the same heat exchanger 340. The heat exchanger 340 exchanges heat with the circulating water after absorbing the battery heat in the circulating water cooling pipeline through the refrigerant. The circulating water after heat exchange becomes cooling water and enters the battery pack liquid cooling unit. Since the cooling water flow rate of each circulating water cooling pipeline is adjusted to control the heat dissipation efficiency of the corresponding battery pack in this embodiment, the heat exchanger 340 is used to centrally exchange heat for all circulating water cooling pipelines. Compared with setting three groups of heat exchangers and adjusting the power of the heat exchanger, it is more cost-effective.

[0040] The liquid cooling controller 400 of this embodiment adopts a single-chip microcomputer controller of model GD32E503VCT6. Since the sensor is easily disturbed by the environment in the energy storage cabinet during data collection, this embodiment sets a Kalman filter calculation module in the liquid cooling controller 400 to accurately calculate the battery pack temperature and circulating water pressure input into the liquid cooling controller at a fixed period. The Kalman filter is a well-known recursive filtering method that uses a linear system state equation and system input and output data to perform optimal estimation calculations on the temperature and pressure parameters collected by the battery pack temperature sensor and the liquid cooling plate, and adjusts the calculated data to the water cooling unit to improve the stability of the entire water cooling unit system.

[0041] The specific process is as follows: First, the battery pack temperature sensor and the liquid cooling plate pressure sensor collect the battery pack temperature data and circulating water pressure data every 0.1 seconds, and collect data 200 times in total. That is, after 20 seconds, the 200 collected data are used as data samples of the Kalman filter, and the current battery temperature and circulating water pressure are calculated by the Kalman filter. The Kalman filter is a mature data calculation model. This embodiment uses the existing Kalman filter calculation model embedded in the liquid cooling controller to calculate and process the temperature and pressure data collected by the battery pack temperature sensor and the liquid cooling plate pressure sensor, and predicts and calculates the battery pack temperature and circulating water pressure every 20 seconds, so as to evaluate the battery pack temperature and make subsequent adjustments to the water cooling unit.

[0042] According to the current battery pack temperature, the circulating water can be heated or cooled. At the same time, the flow rate of the circulating pump is adjusted according to the circulating water pressure feedback. When the circulating water pressure in a battery pack liquid cold plate is too low, the output power of the circulating pump on the corresponding circulating water cooling pipeline can be increased to increase the pressure of the circulating water in the battery pack liquid cold plate; when the circulating water pressure in the battery pack liquid cold plate is too high, the output power of the circulating pump can be reduced to reduce the pressure of the circulating water in the battery pack liquid cold plate. In addition, when the circulating water pressure needs to be increased, the circulating water pressure can be increased to a certain extent by reducing the flow rate through the flow regulating valve without increasing the output frequency of the circulating pump, thereby achieving low power consumption operation of the circulating pump.

[0043] like Figure 3 As shown, the liquid cooling controller 400 of this embodiment is connected to the local interaction module 460 of the energy storage cabinet in communication, and the local control module includes but is not limited to a display screen module, a control command module and a button module, which is used for the operator to actively control the water cooling unit on site. The liquid cooling controller 400 is also provided with a wireless communication module 440, which communicates with the host computer through wireless network transmission technology (such as Bluetooth, WIFI, etc.), and realizes remote status monitoring and system control of the energy storage liquid cooling temperature control system through the host computer. The liquid cooling controller 400 is also connected to the BMS battery management system 500 of the energy storage cabinet through an external communication interface 450. The liquid cooling controller 400 exchanges data with the BMS battery management system 500 of the energy storage cabinet, and the external communication interface feeds back the operating status information of the liquid cooling unit to the battery management system of the energy storage cabinet for management. The BMS system is a mature battery management system for battery energy storage equipment, and this embodiment does not elaborate on the BMS system here.

[0044] The water-cooled unit of the multi-battery pack energy storage system can also operate a water-cooled power module 600 that supplies power to the liquid cooling controller and the device driver module on the circulating water cooling pipeline. The water-cooled power module 600 is electrically connected to the liquid cooling controller and the circulating pump, flow regulating valve, heater and heat exchanger on the circulating water cooling pipeline respectively. The water-cooled power module of this embodiment includes a filter and a transformer, wherein the filter adopts CW4L2-20A-T, and outputs AC220V in two ways to power the device driver module on the circulating water cooling pipeline and output to the transformer. The transformer adopts NDK-25VA, which converts 220V AC power into DC12V output to power the liquid cooling controller. The specific power module filter circuit and transformer circuit are both mature power module devices. This embodiment does not repeat the specific circuit of the water-cooled power module.

[0045] The specific working process of the water cooling unit of the multi-battery pack energy storage system of the energy storage cabinet in this embodiment is as follows:

[0046] (1) Initialization settings

[0047] Start the system and perform initial inspection and setup. Set the initial circulating water pressure and battery pack temperature target values ​​according to system requirements.

[0048] (2) Start multi-channel water circulation

[0049] Turn on the circulating pump and electric heater on the circulating water cooling pipeline corresponding to each battery pack. Adjust the speed of the circulating pump to control the flow rate of the circulating water in the circulating water cooling pipeline and the battery pack liquid cooling plate, and adjust the heating temperature of the circulating water by controlling the output power of the electric heater.

[0050] (3) Circulation and monitoring

[0051] The circulating water flows continuously while monitoring the temperature and circulating water pressure of each battery pack. The liquid cooling controller uses the Kalman filter and combines the data input from the sensor cycle to accurately calculate the battery pack temperature and circulating water pressure at the end of the detection cycle.

[0052] (4) Battery pack temperature control and circulating water pressure control

[0053] The liquid cooling controller compares the calculation results with the initial circulating water pressure and the target battery pack temperature, adjusts the output power of the electric heater, controls the temperature of the circulating water, and controls the circulating water pressure under each battery pack to be stable and balanced by adjusting the circulating pump and flow regulating valve until the battery pack reaches the target temperature and remains stable. During the operation of the battery pack, the water cooling unit is controlled and adjusted according to the real-time temperature of the battery pack.

[0054] In this document, the directions or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "vertical", and "horizontal" are based on the directions or positional relationships shown in the accompanying drawings and are only for the clarity of the technical solution and the convenience of description. Therefore, they should not be understood as limitations on the present invention.

[0055] In this document, the terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than those listed and may also include additional elements not expressly listed.

[0056] The above are only specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A water-cooled unit for a multi-battery energy storage system, characterized by: Adopt multiple parallel circulating water cooling pipelines, and each battery pack is allocated an independently controlled circulating water cooling pipeline; A circulating pump, a flow regulating valve, a heater and a heat exchanger are arranged in series on each of the circulating water cooling pipelines, and are respectively connected to the two ends of the corresponding battery pack liquid cooling unit through the water inlet and the water outlet of the circulating water cooling pipeline; Each of the battery packs is provided with a temperature sensor, and each of the liquid cooling units corresponding to the battery packs is provided with a pressure sensor. The water cooling unit also includes a liquid cooling controller, and the input end of the liquid cooling controller is communicatively connected with the temperature sensors and pressure sensors of all the battery packs and the liquid cooling units, and the output end of the liquid cooling controller is communicatively connected with the circulating pump, flow regulating valve and heater on the circulating water cooling pipeline corresponding to each battery pack.

2. The multi-battery pack energy storage system water cooling unit according to claim 1, characterized in that: All circulating water cooling pipelines share the same heat exchanger.

3. The multi-battery pack energy storage system water cooling unit according to claim 1, characterized in that: The liquid cooling controller is communicatively connected to a local interaction module of the energy storage system.

4. The multi-battery pack energy storage system water cooling unit according to claim 3, characterized in that: The liquid cooling controller is also connected to the BMS battery management system of the energy storage system through an external communication interface.

5. The multi-battery pack energy storage system water cooling unit according to claim 4, characterized in that: A Kalman filter calculation module is arranged in the liquid cooling controller.

6. The multi-battery pack energy storage system water cooling unit according to claim 1, characterized in that: The circulating pump adopts a variable frequency water pump, and the heater adopts a variable frequency heater.

7. The multi-battery pack energy storage system water cooling unit according to claim 1, characterized in that: It also includes a water-cooled power supply module, which is electrically connected to the liquid cooling controller and a circulating pump, a flow regulating valve, a heater and a heat exchanger on the circulating water cooling pipeline.

8. An energy storage cabinet, characterized in that: The energy storage cabinet has at least two battery packs encapsulated and arranged inside, and includes a multi-battery pack energy storage system water cooling unit according to any one of claims 1-7, so as to achieve temperature control of the multiple battery packs in the energy storage cabinet.

9. The energy storage cabinet according to claim 8, characterized in that: Each group of battery packs is provided with a battery pack liquid cooling plate, the battery pack liquid cooling plate has a liquid cooling cavity inside, and a liquid cooling plate water inlet and a liquid cooling plate water outlet outside, which are respectively connected to the circulating water outlet and the circulating water inlet of the corresponding battery pack circulating water cooling pipeline.

10. The energy storage cabinet according to claim 9, characterized in that: The multiple battery packs in the energy storage cabinet are stacked along the height of the cabinet. The battery pack liquid cooling unit is a battery pack liquid cooling plate attached to the bottom of the battery pack. The cabinet below the battery pack is provided with a liquid cooling control module for centrally setting the water cooling unit of the multi-battery pack energy storage system.

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