Temperature control method and temperature control device of energy storage cabinet and energy storage cabinet

Abstract

The invention discloses a temperature control method and device of an energy storage cabinet and the energy storage cabinet, and relates to the technical field of energy storage cabinets, the temperature control method is applied to the energy storage cabinet comprising a battery module and a temperature adjusting system, and the temperature adjusting system has a pure power mode, a first-stage refrigeration mode, a second-stage refrigeration mode, a first-stage heating mode and a second-stage heating mode. The temperature control method comprises the following steps: when the energy storage cabinet enters a charging and discharging state, acquiring the cell temperature of the battery module and the return water temperature of the temperature adjusting system; if the temperature of the battery cell is greater than the first set threshold value, the temperature adjusting system is operated in a second-stage refrigeration mode, and then the operation mode is adjusted according to the difference value between the first set threshold value and the return water temperature; if the battery cell temperature is smaller than a second set threshold value, the temperature adjusting system is operated in a second-stage heating mode, then the operation mode is adjusted according to the difference value between the second set threshold value and the return water temperature, and the second set threshold value is smaller than the first set threshold value. The temperature control method meets the requirements for high cycle efficiency and safety of the energy storage cabinet.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage cabinets, and particularly to a temperature control method, a temperature control device and an energy storage cabinet for an energy storage cabinet. Background Art

[0002] With the wide application of renewable energy and the continuous development of smart grids, energy storage cabinets have increasingly become a key tool for ensuring efficient energy utilization and managing grid loads. However, during the charging and discharging process of energy storage cabinets, a large amount of heat is generated, resulting in a continuous increase in the battery temperature, and the heat accumulation causes the temperature inside the cabinet to rise continuously. Once the battery temperature reaches a certain level, it will accelerate the side reactions inside the battery, significantly reduce the cycle life of the battery, and the high-temperature environment will also seriously affect the battery safety, significantly increasing the risk of battery fire or explosion. At present, energy storage cabinets mainly rely on peak-valley electricity prices for arbitrage, and the cycle efficiency is an important evaluation index. The higher the efficiency, the higher the system revenue.

[0003] Therefore, how to meet the requirements of industry and commerce for high efficiency and safety of energy storage cabinets is a technical problem that needs to be solved by those skilled in the art at present. Summary of the Invention

[0004] The purpose of the present application is to provide a temperature control method, a temperature control device and an energy storage cabinet for an energy storage cabinet, which can meet the requirements of high cycle efficiency and safety for the energy storage cabinet.

[0005] To achieve the above purpose, the present application provides a temperature control method for an energy storage cabinet, which is applied to an energy storage cabinet. The energy storage cabinet includes a battery module and a temperature control system for adjusting the temperature of the battery module. The temperature control system has a pure power mode, a first-stage refrigeration mode, a second-stage refrigeration mode, a first-stage heating mode, and a second-stage heating mode. The temperature control method includes: When the energy storage cabinet enters the charging and discharging state, obtain the cell temperature of the battery module and the return water temperature of the temperature control system; Judge whether the cell temperature is greater than a first set threshold; If the cell temperature is greater than the first set threshold, after controlling the temperature control system to operate in the second-stage refrigeration mode, control the temperature control system to operate in the second-stage refrigeration mode, the first-stage refrigeration mode or the pure power mode according to the difference between the first set threshold and the return water temperature;

[0006] If the cell temperature is not greater than the first set threshold, judge whether the cell temperature is less than a second set threshold. If the cell temperature is less than the second set threshold, after controlling the temperature control system to operate in the second-stage heating mode, control the temperature control system to operate in the second-stage heating mode, the first-stage heating mode or the pure power mode according to the difference between the second set threshold and the return water temperature, where the second set threshold is less than the first set threshold.

[0007] In some embodiments, the steps of controlling the temperature regulation system to operate in the second-stage refrigeration mode, the first-stage refrigeration mode, or the pure power mode according to the difference between the first set threshold and the return water temperature include: When the difference between the first set threshold and the return water temperature is within the first temperature range, control the temperature regulation system to operate in the second-stage refrigeration mode; When the difference between the first set threshold and the return water temperature is within the second temperature range, control the temperature regulation system to operate in the first-stage refrigeration mode; When the difference between the first set threshold and the return water temperature is within the third temperature range, control the temperature regulation system to operate in the pure power mode;

[0008] Among them, the value range of the first set threshold is -10 to 60 degrees Celsius, the first temperature range is 2 to 40 degrees Celsius, the second temperature range is 0.2 to 1 degree Celsius, and the third temperature range is -1 to -0.2 degrees Celsius.

[0009] In some embodiments, the temperature control method further includes: When the energy storage cabinet is in the standby state, obtain the core temperature of the battery module;

[0010] Judge whether the core temperature is greater than the third set threshold. If the core temperature is greater than the third set threshold, control the temperature regulation system to operate in the first-stage refrigeration mode until the core temperature does not exceed the fourth set threshold, and then control the temperature regulation system to operate in the pure power mode. If the core temperature is not greater than the third set threshold, control the temperature regulation system to stop operating, where the fourth set threshold is less than the third set threshold.

[0011] In some embodiments, the steps of controlling the temperature regulation system to operate in the second-stage heating mode, the first-stage heating mode, or the pure power mode according to the difference between the second set threshold and the return water temperature include: When the difference between the second set threshold and the return water temperature is within the fourth temperature range, control the temperature regulation system to operate in the pure power mode; When the difference between the second set threshold and the return water temperature is within the fifth temperature range, control the temperature regulation system to operate in the first-stage heating mode; When the difference between the second set threshold and the return water temperature is within the sixth temperature range, control the temperature regulation system to operate in the second-stage heating mode;

[0012] Among them, the value range of the second set threshold is 0 to 20 degrees Celsius, the fourth temperature range is 0 to 40 degrees Celsius, the fifth temperature range is -5 to 0 degrees Celsius, and the sixth temperature range is -30 to -5 degrees Celsius.

[0013] In some embodiments, the temperature control method further includes: When the energy storage cabinet is in the standby state, obtain the core temperature of the battery module;

[0014] Judge whether the battery cell temperature is less than the fifth set threshold. If the battery cell temperature is less than the fifth set threshold, control the temperature regulation system to operate in the first-stage heating mode until the battery cell temperature exceeds the sixth set threshold, and then control the temperature regulation system to operate in the pure power mode, where the fifth set threshold is less than the sixth set threshold.

[0015] In some embodiments, before the step of controlling the temperature regulation system to operate in the second-stage cooling mode, the first-stage cooling mode, or the pure power mode according to the difference between the first set threshold and the return water temperature, the method further includes: Judge the change trend of the return water temperature; If the return water temperature is in a downward trend, the step of controlling the temperature regulation system to operate in the second-stage cooling mode, the first-stage cooling mode, or the pure power mode according to the difference between the first set threshold and the return water temperature includes: When the difference between the first set threshold and the return water temperature is within the first temperature range, control the temperature regulation system to operate in the second-stage cooling mode; When the difference between the first set threshold and the return water temperature is within the second temperature range, control the temperature regulation system to operate in the first-stage cooling mode; When the difference between the first set threshold and the return water temperature is within the third temperature range, control the temperature regulation system to operate in the pure power mode; If the return water temperature is in an upward trend, the step of controlling the temperature regulation system to operate in the second-stage cooling mode, the first-stage cooling mode, or the pure power mode according to the difference between the first set threshold and the return water temperature includes: When the difference between the first set threshold and the return water temperature is within the first temperature range, control the temperature regulation system to operate in the second-stage cooling mode; When the difference between the first set threshold and the return water temperature is within the seventh temperature range, control the temperature regulation system to operate in the first-stage cooling mode; When the difference between the first set threshold and the return water temperature is within the third temperature range, control the temperature regulation system to operate in the pure power mode;

[0016] Wherein, the first temperature range is 2 to 40 degrees Celsius, the second temperature range is 0.2 to 1 degree Celsius, the third temperature range is -1 to -0.2 degrees Celsius, and the seventh temperature range is 1.2 to 2 degrees Celsius.

[0017] In some embodiments, before the step of controlling the temperature regulation system to operate in the second-stage heating mode, the first-stage heating mode, or the pure power mode according to the difference between the second set threshold and the return water temperature, the method further includes: Judge the change trend of the return water temperature; If the return water temperature is in an upward trend, the step of controlling the temperature regulation system to operate in the second-stage heating mode, the first-stage heating mode, or the pure power mode according to the difference between the second set threshold and the return water temperature includes: When the difference between the second set threshold and the return water temperature is within the fourth temperature range, control the temperature regulation system to operate in a pure power mode; When the difference between the second set threshold and the return water temperature is within the fifth temperature range, control the temperature regulation system to operate in the first-stage heating mode; When the difference between the second set threshold and the return water temperature is within the sixth temperature range, control the temperature regulation system to operate in the second-stage heating mode; If the return water temperature is on a downward trend, the steps of controlling the temperature regulation system to operate in the second-stage heating mode, the first-stage heating mode or the pure power mode according to the difference between the second set threshold and the return water temperature include: When the difference between the second set threshold and the return water temperature is within the fourth temperature range, control the temperature regulation system to operate in a pure power mode; When the difference between the second set threshold and the return water temperature is within the fifth temperature range, control the temperature regulation system to operate in the first-stage heating mode; When the difference between the second set threshold and the return water temperature is within the eighth temperature range, control the temperature regulation system to operate in the second-stage heating mode;

[0018] Among them, the fourth temperature range is 0 to 40 degrees Celsius, the fifth temperature range is -5 to 0 degrees Celsius, the sixth temperature range is -30 to -5 degrees Celsius, and the eighth temperature range is -29 to -4 degrees Celsius.

[0019] This application also provides a temperature control device for an energy storage cabinet, which adopts the above-mentioned temperature control method for the energy storage cabinet. The temperature control device includes: A temperature regulation system, including two temperature regulation modules and a heat exchange pipeline. The temperature regulation module includes an outlet water pipeline, a return water pipeline, a water pump, a refrigeration unit, a heating unit and a temperature regulation controller. The water pump, the refrigeration unit and the heating unit are connected in series. Blocking valves are provided on both the outlet water pipeline and the return water pipeline. The temperature regulation controller is electrically connected to the water pump, the refrigeration unit, the heating unit and the blocking valve. The temperature regulation controller is used to control the opening and closing of the water pump, the refrigeration unit, the heating unit and the blocking valve. The heat exchange pipeline includes two first-stage pipelines, and both of the two first-stage pipelines are connected to the battery module through a second-stage pipeline. The two first-stage pipelines are respectively connected to the outlet water pipeline and the return water pipeline; A cell temperature collector, which is used to collect the cell temperature of the battery module; A return water temperature collector, which is used to collect the return water temperature of the return water pipeline;

[0020] A battery management system, which is electrically connected to the cell temperature collector, the return water temperature collector and the temperature regulation controller, and is used to send control instructions to the temperature regulation controller according to the temperature data collected by the cell temperature collector and the return water temperature collector.

[0021] This application also provides an energy storage cabinet, including the above-mentioned temperature control device.

[0022] In some embodiments, the energy storage cabinet also includes a cabinet body and a cabinet door, the cabinet body includes a first chamber, a second chamber and an intermediate chamber, the intermediate chamber is arranged between the first chamber and the second chamber, a power converter is installed in the intermediate chamber, two temperature control modules of the temperature control device are arranged in the first chamber, and a battery module is installed in the second chamber.

[0023] Relative to the above-mentioned background technology, the temperature control method of the energy storage cabinet provided in the embodiment of the present application is applied to an energy storage cabinet including a battery module and a temperature control system. The temperature control system is used to adjust the temperature of the battery module, and the temperature control system has multiple operating modes. When the energy storage cabinet is charging and discharging, the battery cell temperature of the battery module and the return water temperature of the temperature control system are obtained. If the battery cell temperature is greater than the first set threshold, the temperature control system is first operated in the second-level cooling mode, and then the operating mode is adjusted according to the difference between the first set threshold and the return water temperature; if the battery cell temperature is less than the second set threshold, the temperature control system is first operated in the second-level heating mode, and then the operating mode is adjusted according to the difference between the second set threshold and the return water temperature. The second set threshold is less than the first set threshold.

[0024] The temperature control method of the energy storage cabinet thus configured has the following beneficial effects:

[0025] In order to meet the requirements of industry and commerce for high cycle efficiency and safety of energy storage cabinets, the present application provides a simple and efficient temperature control method for energy storage cabinets. By real-time monitoring of the cell temperature of the battery module and the return water temperature of the temperature control system, and finely adjusting the operation mode of the temperature control system according to the difference between the cell temperature setting threshold and the return water temperature, the temperature of the battery module can be accurately controlled, and the battery operating temperature can be stabilized in the optimal range (between the first set threshold and the second set threshold), reducing battery aging caused by drastic temperature fluctuations, improving battery performance and service life, reducing equipment replacement costs and maintenance frequency, and avoiding battery performance degradation caused by overcooling or overheating and the resulting safety hazards, reducing the risks of fire and explosion, and enhancing the overall safety of the energy storage cabinet. In addition, efficient energy utilization can be achieved, and the operating efficiency and economy of the energy storage cabinet can be improved.

[0026] The beneficial effects of a temperature control device for an energy storage cabinet using the temperature control method for an energy storage cabinet and an energy storage cabinet including the temperature control device provided in the present application are as described above and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] To more clearly illustrate the technical solutions in the embodiments of the present application or in the related art, the following will briefly introduce the drawings required for the description of the embodiments or the related art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0028] Figure 1 Flow chart of the temperature control method for the energy storage cabinet in the embodiments of the present application Figure 1 。

[0029] Figure 2 Flow chart of the temperature control method for the energy storage cabinet in the embodiments of the present application Figure 2 。

[0030] Figure 3 Control block diagram of the temperature control device for the energy storage cabinet in the embodiments of the present application Figure 1 。

[0031] Figure 4 Control block diagram of the temperature control device for the energy storage cabinet in the embodiments of the present application Figure 2 。

[0032] Figure 5 Schematic connection diagram of the temperature control device for the energy storage cabinet in the embodiments of the present application.

[0033] Figure 6 For Figure 5 Schematic pipeline connection diagram of the temperature control device shown.

[0034] Figure 7 Schematic overall structure diagram of the energy storage cabinet in the embodiments of the present application.

[0035] Wherein: 10 - Battery module; 20 - Temperature control device; 21 - Temperature regulation system, 211 - Temperature regulation module, 2111 - Outlet water pipeline, 2112 - Return water pipeline, 2113 - Water pump, 2114 - Refrigeration unit, 2115 - Heating unit, 2116 - Temperature regulation controller, 2117 - Blocking valve, 212 - Heat exchange pipeline, 2121 - Primary pipeline, 2122 - Secondary pipeline; 22 - Cell temperature collector; 23 - Return water temperature collector; 24 - Battery management system; 25 - Energy management system; 30 - Cabinet; 40 - Cabinet door, 41 - Protective net;

[0036] 50 - Power converter. Detailed implementation manners

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part rather than all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0038] To enable those skilled in the art of this technology to better understand the solution of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0039] The temperature control method for the energy storage cabinet provided in the embodiments of the present application is applied to the energy storage cabinet. The energy storage cabinet includes a battery module 10 and a temperature control system 21 for adjusting the temperature of the battery module 10. The temperature control system 21 has a pure power mode, a first-stage refrigeration mode, a second-stage refrigeration mode, a first-stage heating mode, and a second-stage heating mode.

[0040] It should be noted that the temperature control system 21 includes two temperature control modules 211. The temperature control module 211 includes a water pump 2113, a refrigeration unit 2114, and a heating unit 2115 connected in series. The so-called first-stage refrigeration mode means that one of the refrigeration units 2114 of the two temperature control modules 211 is turned on. The so-called second-stage refrigeration mode means that the refrigeration units 2114 of the two temperature control modules 211 are both turned on. The so-called first-stage heating mode means that one of the heating units 2115 of the two temperature control modules 211 is turned on. The so-called second-stage heating mode means that the heating units 2115 of the two temperature control modules 211 are both turned on. The so-called pure power mode means that only the water pump 2113 of the temperature control module 211 is turned on.

[0041] Please refer to Figure 1 simultaneously, the above temperature control method for the energy storage cabinet includes: S1: When the energy storage cabinet enters the charge and discharge state, obtain the core temperature of the battery module 10 and the return water temperature of the temperature control system 21; S2: Determine whether the core temperature is greater than a first set threshold; If the core temperature is greater than the first set threshold, after controlling the temperature control system 21 to operate in the second-stage refrigeration mode, control the temperature control system 21 to operate in the second-stage refrigeration mode, the first-stage refrigeration mode, or the pure power mode according to the difference between the first set threshold and the return water temperature;

[0042] If the temperature of the battery cell is not greater than the first set threshold, it is determined whether the temperature of the battery cell is less than the second set threshold. If the temperature of the battery cell is less than the second set threshold, after controlling the temperature control system 21 to operate in the second-stage heating mode, the temperature control system 21 is controlled to operate in the second-stage heating mode, the first-stage heating mode or the pure power mode according to the difference between the second set threshold and the return water temperature.

[0043] That is to say, the temperature control method of the energy storage cabinet provided by the embodiment of the present application is applied to an energy storage cabinet including a battery module 10 and a temperature control system 21. The temperature control system 21 is used to adjust the temperature of the battery module 10, and the temperature control system 21 has multiple operating modes. When the energy storage cabinet is charging and discharging, the temperature of the battery cell of the battery module 10 and the return water temperature of the temperature control system 21 are acquired. If the temperature of the battery cell is greater than the first set threshold, the temperature control system 21 is first operated in the second-stage cooling mode, and then the operating mode is adjusted according to the difference between the first set threshold and the return water temperature; if the temperature of the battery cell is less than the second set threshold, the temperature control system 21 is first operated in the second-stage heating mode, and then the operating mode is adjusted according to the difference between the second set threshold and the return water temperature.

[0044] It should be noted that the above second set threshold is less than the first set threshold. The value range of the first set threshold is generally -10 to 60 degrees Celsius, and the value range of the second set threshold is generally 0 to 20 degrees Celsius.

[0045] In order to meet the requirements of industry and commerce for the high cycle efficiency and safety of the energy storage cabinet, the present application provides a simple and efficient temperature control method for the energy storage cabinet. By real-time monitoring the temperature of the battery cell of the battery module 10 and the return water temperature of the temperature control system 21, and finely regulating the operating mode of the temperature control system 21 according to the difference between the set threshold of the battery cell temperature and the return water temperature, the temperature of the battery module 10 can be accurately controlled, the battery operating temperature can be stabilized in the optimal range (between the first set threshold and the second set threshold), the battery aging caused by severe temperature fluctuations can be reduced, the battery performance and service life can be improved, the replacement cost and maintenance frequency of the equipment can be reduced, and at the same time, the battery performance attenuation caused by overcooling or overheating and the resulting safety hazards can be avoided, the risks of fire, explosion, etc. can be reduced, the overall safety of the energy storage cabinet can be enhanced. In addition, the multiple operating modes of the temperature control system 21 can be flexibly switched according to different temperature thresholds, the efficient utilization of energy can be realized, and the operating efficiency and economy of the energy storage cabinet can be improved.

[0046] In some embodiments, the step of controlling the temperature control system 21 to operate in the second-stage cooling mode, the first-stage cooling mode or the pure power mode according to the difference between the first set threshold and the return water temperature includes: When the difference between the first set threshold and the return water temperature is within the first temperature range, control the temperature control system 21 to operate in the second-stage cooling mode; When the difference between the first set threshold and the return water temperature is within the second temperature range, control the temperature regulation system 21 to operate in the first-stage refrigeration mode; When the difference between the first set threshold and the return water temperature is within the third temperature range, control the temperature regulation system 21 to operate in the pure power mode;

[0047] Among them, the first temperature range is 2 to 40 degrees Celsius, the second temperature range is 0.2 to 1 degree Celsius, and the third temperature range is -1 to -0.2 degrees Celsius.

[0048] It can be seen that when the first set threshold is significantly higher than the return water temperature (temperature difference ≥ 2 degrees Celsius), it indicates that the battery is in a high heat generation state (such as high-current charging and discharging), and immediately start the second-stage refrigeration mode (high power) to quickly dissipate heat and prevent thermal runaway caused by overheating of the battery cells. When the temperature difference shrinks to near balance (0.2 to 1 degree Celsius), switch to the first-stage refrigeration mode (low power) to avoid energy waste caused by full-power operation, and at the same time maintain the temperature within the safety threshold. When the first set threshold is lower than the return water temperature (temperature difference is negative), it means that the refrigeration demand disappears or there is a risk of overcooling, and switch to the pure power mode (only circulation), using the natural heat dissipation of the coolant to completely avoid excessive refrigeration.

[0049] With such settings, when the temperature difference is high (above 2 degrees Celsius), full-power refrigeration is carried out, and the temperature of the battery cells is quickly reduced to the optimal operating temperature range through high-power refrigeration, slowing down the degradation of battery performance caused by high temperature and extending the battery life; when the temperature difference is low (0.2 to 1 degree Celsius), the operation is downgraded to improve energy utilization efficiency; in the negative temperature difference range (-1 to -0.2 degrees Celsius), the compression refrigeration function is turned off, and only the pump circulation is maintained to reduce standby power consumption, and to avoid the growth of lithium dendrites caused by continuous cooling when the temperature of the battery cells is below 0 degrees Celsius, reducing the short-circuit risk.

[0050] In this way, through the strong correlation design between the above temperature difference range and the refrigeration power, a balance is achieved among battery safety, energy efficiency, and equipment life, which is especially suitable for industrial and commercial energy storage scenarios that require frequent charging and discharging and have variable ambient temperatures, and the comprehensive operating cost (including electricity cost and maintenance cost) can be greatly reduced.

[0051] That is to say, while meeting the battery temperature regulation requirements, by reasonably controlling the operating mode of the temperature regulation system 21, the overall performance of the energy storage cabinet is optimized to ensure its stability and reliability during the charging and discharging process.

[0052] In some embodiments, the temperature control method further includes: When the energy storage cabinet is in the standby state, obtain the temperature of the battery cells of the battery module 10;

[0053] Determine whether the temperature of the battery cell is greater than the third set threshold. If the temperature of the battery cell is greater than the third set threshold, control the temperature regulation system 21 to operate in the first-stage refrigeration mode until the temperature of the battery cell does not exceed the fourth set threshold, and then control the temperature regulation system 21 to operate in the pure power mode. If the temperature of the battery cell is not greater than the third set threshold, control the temperature regulation system 21 to stop operating.

[0054] Among them, the fourth set threshold is less than the third set threshold. The value range of the third set threshold is generally 35 to 60 degrees Celsius, and the value range of the fourth set threshold is generally the third set threshold - 2 degrees Celsius.

[0055] With such settings, when the energy storage cabinet is in the standby state, by monitoring the temperature of the battery cell and combining the set threshold to control the operation mode of the temperature regulation system 21, the temperature of the battery module 10 can be accurately adjusted to ensure that the battery is always in a suitable temperature environment. At the same time, the operation mode of the temperature regulation system 21 can be flexibly switched according to the actual temperature situation, optimizing the energy consumption of the temperature regulation system 21 while meeting the temperature control requirements and improving the operation efficiency of the system. In addition, when the temperature of the battery module 10 is within the safe range, the operation of the temperature regulation system 21 can be stopped, thereby reducing the energy consumption of the energy storage system and the operation cost.

[0056] In some embodiments, the step of controlling the temperature regulation system 21 to operate in the second-stage heating mode, the first-stage heating mode or the pure power mode according to the difference between the second set threshold and the return water temperature includes: When the difference between the second set threshold and the return water temperature is within the fourth temperature range, control the temperature regulation system 21 to operate in the pure power mode; When the difference between the second set threshold and the return water temperature is within the fifth temperature range, control the temperature regulation system 21 to operate in the first-stage heating mode; When the difference between the second set threshold and the return water temperature is within the sixth temperature range, control the temperature regulation system 21 to operate in the second-stage heating mode;

[0057] Among them, the fourth temperature range is 0 to 40 degrees Celsius, the fifth temperature range is -5 to 0 degrees Celsius, and the sixth temperature range is -30 to -5 degrees Celsius.

[0058] It can be seen that when the second set threshold is significantly higher than the return water temperature (the temperature difference is 0 to 40 degrees Celsius), it indicates that the battery cells may generate heat by themselves during charging and discharging or the ambient temperature is relatively high, and there is no need for additional heating. At this time, the temperature control system 21 switches to the pure power mode. The pure power mode only maintains the coolant circulation and adjusts the temperature by natural heat dissipation or subsequent refrigeration process (if necessary), avoiding the ineffective operation of the heating unit of the temperature control system 21 and directly reducing energy consumption. When the second set threshold is lower than the return water temperature (the temperature difference is negative), it indicates that active heating is required. According to the degree of negative temperature difference (-5 to 0 degrees Celsius for mild low temperature, -30 to -5 degrees Celsius for extreme low temperature), the first stage (low power) or the second stage (high power) heating mode is started respectively to accurately match the heating demand and avoid energy waste caused by high-power operation under low load.

[0059] Specifically, when the temperature difference is in the fifth temperature range (-5 to 0 degrees Celsius), low-power heating is adopted, which can not only meet the heating demand under mild low temperature but also prevent temperature overshoot caused by high-power heating, reducing the life attenuation of the battery cells caused by frequent temperature fluctuations. When the temperature difference is in the sixth temperature range (-30 to -5 degrees Celsius), it indicates that in an extremely cold scenario (the temperature of the battery cells is much lower than the return water temperature). At this time, the temperature control system 21 operates in the second-stage heating mode. The second-stage heating mode can quickly raise the temperature of the battery cells to the safe range, preventing problems such as sudden capacity drop and lithium deposition of the battery caused by low temperature, and ensuring the availability of the energy storage cabinet in a severe cold environment.

[0060] In this way, through negative temperature difference hierarchical heating and the strategy that the heating power is higher when the negative value of the temperature difference is larger (the lower temperature is more severe), the temperature recovery time in a low-temperature environment is shortened, the dynamic response ability of the system is improved, and a balance is achieved among rapid response in extremely low temperature, prevention of heating overshoot, optimization of energy efficiency and equipment reliability, which is especially suitable for energy storage scenarios with large temperature difference fluctuations and harsh environments (such as alpine regions and outdoor energy storage power stations), effectively improving the all-climate adaptability and comprehensive economy of the system.

[0061] In some embodiments, the temperature control method further includes: When the energy storage cabinet is in the standby state, obtain the temperature of the battery cells of the battery module 10;

[0062] Judge whether the temperature of the battery cells is less than the fifth set threshold. If the temperature of the battery cells is less than the fifth set threshold, control the temperature control system 21 to operate in the first-stage heating mode until the temperature of the battery cells exceeds the sixth set threshold, and then control the temperature control system 21 to operate in the pure power mode.

[0063] Among them, the fifth set threshold is less than the sixth set threshold. The value range of the fifth set threshold is generally -20 to 20 degrees Celsius, and the value range of the sixth set threshold is generally the fifth set threshold + 2 degrees Celsius.

[0064] With such a setting, when the energy storage cabinet is on standby, by monitoring the cell temperature and comparing it with the set threshold, precise detection and control of the low-temperature state of the battery module 10 are achieved. Through timely and effective heating measures, it is ensured that the battery always remains within a suitable operating temperature range, avoiding performance degradation or damage to the battery due to low temperature, reducing battery capacity attenuation and lifespan shortening caused by low temperature, and extending the cycle lifespan of the battery. At the same time, according to the actual temperature situation, the heating mode and pure power mode of the temperature control system 21 are flexibly switched. While meeting the temperature control requirements, by reasonably controlling the operation of the temperature control system 21, unnecessary heating or continuous high-energy consumption operation is avoided, the energy consumption of the temperature control system 21 is optimized, the operation efficiency of the system is improved, and the overall operation cost of the energy storage cabinet is reduced.

[0065] With the above setting method, on the one hand, according to the difference range between the cell temperature set threshold and the return water temperature, different levels of cooling or heating modes are respectively adopted to achieve fine regulation of the temperature of the battery module 10, ensuring that the battery always remains within a suitable operating temperature range and improving battery performance and lifespan. On the other hand, through the dynamic switching of multi-stage cooling / heating modes (secondary cooling, secondary heating), the system can accurately match the required power according to the difference between the cell temperature set threshold and the return water temperature, avoiding energy waste in traditional full-power operation. For example: when the difference between the cell temperature set threshold and the return water temperature shrinks to the second temperature range, the temperature control system 21 automatically degrades to low-power mode operation; when the difference between the cell temperature set threshold and the return water temperature shrinks to the third temperature range, the temperature control system 21 automatically degrades to pure power mode operation, both of which can significantly reduce energy consumption.

[0066] In some embodiments, before the step of controlling the temperature control system 21 to operate in the secondary cooling mode, primary cooling mode or pure power mode according to the difference between the first set threshold and the return water temperature, it further includes: Judging the change trend of the return water temperature; If the return water temperature is in a downward trend, the step of controlling the temperature control system 21 to operate in the secondary cooling mode, primary cooling mode or pure power mode according to the difference between the first set threshold and the return water temperature includes: When the difference between the first set threshold and the return water temperature is within the first temperature range, control the temperature control system 21 to operate in the secondary cooling mode; When the difference between the first set threshold and the return water temperature is within the second temperature range, control the temperature control system 21 to operate in the primary cooling mode; When the difference between the first set threshold and the return water temperature is within the third temperature range, control the temperature control system 21 to operate in the pure power mode; If the return water temperature is in an upward trend, the step of controlling the temperature control system 21 to operate in the secondary cooling mode, primary cooling mode or pure power mode according to the difference between the first set threshold and the return water temperature includes: When the difference between the first set threshold and the return water temperature is within the first temperature range, control the temperature regulation system 21 to operate in the second-stage refrigeration mode; When the difference between the first set threshold and the return water temperature is within the seventh temperature range, control the temperature regulation system 21 to operate in the first-stage refrigeration mode; When the difference between the first set threshold and the return water temperature is within the third temperature range, control the temperature regulation system 21 to operate in the pure power mode;

[0067] Among them, the first temperature range is 2 to 40 degrees Celsius, the second temperature range is 0.2 to 1 degree Celsius, the third temperature range is -1 to -0.2 degrees Celsius, and the seventh temperature range is the second temperature range + 1, that is, 1.2 to 2 degrees Celsius.

[0068] It can be seen that by monitoring the rising / falling trend of the return water temperature, the system can perceive the change of the refrigeration environment in advance. For example, the decrease of the return water temperature indicates good refrigeration conditions (refrigeration power is greater than heating power), and the increase of the return water temperature indicates an increase in refrigeration pressure and insufficient refrigeration capacity.

[0069] Under the rising trend of the return water temperature, expand the temperature difference trigger range of the first-stage refrigeration mode from 0.2 to 1 degree Celsius to 1.2 to 2 degrees Celsius (the seventh temperature range), which is equivalent to introducing a "hysteresis band" to reduce the operation duration of the second-stage refrigeration mode. That is to say, the purpose of expanding the first-stage refrigeration temperature difference range (the seventh temperature range) when the return water temperature rises is to minimize the high-power operation time of the temperature regulation system 21 as much as possible, thereby reducing power consumption.

[0070] In addition, it should be noted that regardless of the change trend of the return water temperature, the third temperature range (-1 to -0.2 degrees Celsius) triggers the pure power mode to completely turn off refrigeration: when the cell temperature is lower than the return water temperature (such as in a low-temperature environment at night + battery standing still), avoid ineffective refrigeration causing the cell to be overcooled, prevent battery performance degradation, and extend the service life of the battery.

[0071] In this way, by detecting the magnitude of the difference between the first set threshold and the return water temperature and the change trend of the return water temperature, the refrigeration operation mode of the temperature regulation system 21 is adjusted, so as to ensure that the cabinet has high energy efficiency and the cell temperature changes little, improve the thermal management ability of the energy storage cabinet, and ensure the safe operation of the system.

[0072] Similarly, before the step of controlling the temperature regulation system 21 to operate in the second-stage heating mode, the first-stage heating mode or the pure power mode according to the difference between the second set threshold and the return water temperature, it also includes: Judge the change trend of the return water temperature; If the return water temperature is on an upward trend, the steps of controlling the temperature adjustment system 21 to operate in the second-stage heating mode, the first-stage heating mode, or the pure power mode according to the difference between the second set threshold and the return water temperature include: When the difference between the second set threshold and the return water temperature is within the fourth temperature range, control the temperature adjustment system 21 to operate in the pure power mode; When the difference between the second set threshold and the return water temperature is within the fifth temperature range, control the temperature adjustment system 21 to operate in the first-stage heating mode; When the difference between the second set threshold and the return water temperature is within the sixth temperature range, control the temperature adjustment system 21 to operate in the second-stage heating mode; If the return water temperature is on a downward trend, the steps of controlling the temperature adjustment system 21 to operate in the second-stage heating mode, the first-stage heating mode, or the pure power mode according to the difference between the second set threshold and the return water temperature include: When the difference between the second set threshold and the return water temperature is within the fourth temperature range, control the temperature adjustment system 21 to operate in the pure power mode; When the difference between the second set threshold and the return water temperature is within the fifth temperature range, control the temperature adjustment system 21 to operate in the first-stage heating mode; When the difference between the second set threshold and the return water temperature is within the eighth temperature range, control the temperature adjustment system 21 to operate in the second-stage heating mode;

[0073] Among them, the fourth temperature range is 0 to 40 degrees Celsius, the fifth temperature range is -5 to 0 degrees Celsius, the sixth temperature range is -30 to -5 degrees Celsius, and the eighth temperature range is the sixth temperature range + 1, that is, -29 to -4 degrees Celsius.

[0074] It can be seen that by monitoring the upward / downward trend of the return water temperature, the system can perceive the change of the refrigeration environment in advance. When the return water temperature rises, it indicates that the heat generation of the battery is greater than the heat dissipation. At this time, the second-stage heating mode (high power) is only enabled when the temperature difference is extremely low (the sixth temperature range: -30 to -5 degrees Celsius), avoiding excessive heating when the temperature difference is small (such as -4 degrees Celsius) and reducing energy consumption. When the return water temperature drops, it indicates the deterioration of the low-temperature environment (such as at night or during a cold snap). At this time, the second-stage heating trigger range is extended to the eighth temperature range (-29 to -4 degrees Celsius), that is, the temperature difference threshold of the second-stage heating mode is adjusted from -30 to -5 degrees Celsius (the sixth temperature range) to -29 to -4 degrees Celsius (the eighth temperature range), forming a hysteresis interval of 0.5 to 1 degree Celsius, allowing high-power heating to be started in advance at a relatively high temperature difference (such as -5 degrees Celsius → -4 degrees Celsius), preventing the core temperature from dropping rapidly due to accelerated heat dissipation, ensuring that the core temperature quickly rises to the safe range in the extremely cold environment, and avoiding permanent loss of battery capacity due to low temperature.

[0075] In addition, it should be noted that regardless of how the return water temperature trend changes, as long as the temperature difference is positive (the fourth temperature range: 0 to 40 degrees Celsius), the heating function (pure power mode) is immediately turned off to prevent the battery cells from overheating due to self-heating or the superposition of heating when the ambient temperature is too high, and to reduce energy consumption.

[0076] In this way, by detecting the magnitude of the difference between the battery cell temperature and the return water temperature and the change trend of the return water temperature, the heating operation mode of the temperature control system 21 is adjusted, which can ensure that the cabinet has high energy efficiency, and the change of the battery cell temperature is small, so as to improve the thermal management ability of the energy storage cabinet and ensure the safe operation of the system.

[0077] In summary, please refer to Figure 2 When the system confirms that the energy storage cabinet enters the charge and discharge state and the battery cell temperature is greater than the first set threshold (i.e., Tmax is greater than CT1), the operation steps of the temperature control method of the energy storage cabinet include: R1. The temperature control system 21 is started and operates in the second-stage refrigeration mode; R2. When the system is refrigerating, monitor the change trend of the return water temperature RT and calculate the difference △T1 between the first set threshold CT1 and the return water temperature RT; R3. If the return water temperature RT is in the process of decreasing: When the difference △T1 between the first set threshold CT1 and the return water temperature RT is t1, the temperature control system 21 operates in the second-stage refrigeration mode; When the difference △T1 between the first set threshold CT1 and the return water temperature RT is t2, the temperature control system 21 operates in the first-stage refrigeration mode; When the difference △T1 between the first set threshold CT1 and the return water temperature RT is t3, the temperature control system 21 operates in the pure power mode; Among them, the value range of CT1 is -10 to 60 degrees Celsius, the value range of t1 is 2 to 40 degrees Celsius, the value range of t2 is 0.2 to 1 degree Celsius, and the value range of t3 is -1 to -0.2 degrees Celsius; R4. If the return water temperature RT is in the process of rising: When the difference △T1 between the first set threshold CT1 and the return water temperature RT is t1, the temperature control system 21 operates in the second-stage refrigeration mode; When the difference △T1 between the first set threshold CT1 and the return water temperature RT is t2 + 1, the temperature control system 21 operates in the first-stage refrigeration mode; When the difference △T1 between the first set threshold CT1 and the return water temperature RT is t3, the temperature control system 21 operates in the pure power mode;

[0078] When the energy storage cabinet is in the standby state and the core temperature is greater than the third set threshold (i.e., Tmax > CT3), the temperature control system 21 operates in the first-stage refrigeration mode until the core temperature does not exceed the fourth set threshold (i.e., Tmax ≤ CT3 - 2), and then the temperature control system 21 operates in the pure power mode. The value range of CT3 is 35 - 60 degrees Celsius.

[0079] When the system confirms that the energy storage cabinet enters the charge and discharge state and the core temperature is less than the second set threshold (i.e., Tmin < CT2), the operation steps of the temperature control method for the energy storage cabinet further include: H1: Start the temperature control system 21 and operate it in the second-stage heating mode; H2: When the system is operating in heating, monitor the change trend of the return water temperature HT and calculate the difference ΔT2 between the second set threshold CT2 and the return water temperature HT; H3: If the return water temperature HT is in the rising process, then When the difference ΔT2 between the second set threshold CT2 and the return water temperature HT = t4, the temperature control system 21 operates in the pure power mode; When the difference ΔT2 between the second set threshold CT2 and the return water temperature HT = t5, the temperature control system 21 operates in the first-stage heating mode; When the difference ΔT2 between the second set threshold CT2 and the return water temperature HT = t6, the temperature control system 21 operates in the second-stage heating mode; The value range of CT3 is 0 - 20 degrees Celsius, the value range of t4 is 0 - 40 degrees Celsius, the value range of t5 is -5 - 0 degrees Celsius, and the value range of t6 is -30 - -5 degrees Celsius; H4: If the return water temperature HT is in the falling process, then When the difference ΔT2 between the second set threshold CT2 and the return water temperature HT = t4, the temperature control system 21 operates in the pure power mode; When the difference ΔT2 between the second set threshold CT2 and the return water temperature HT = t5, the temperature control system 21 operates in the first-stage heating mode;

[0080] When the difference ΔT2 between the second set threshold CT2 and the return water temperature HT = t6 + 1, the temperature control system 21 operates in the second-stage heating mode.

[0081] When the energy storage cabinet is in the standby state and the core temperature is less than the fifth set threshold, the temperature control system 21 operates in the first-stage heating mode until the core temperature exceeds the sixth set threshold (the fifth set threshold + 2), and then the temperature control system 21 operates in the pure power mode; the value range of the fifth set threshold is -20 - 20 degrees Celsius.

[0082] A temperature control device 20 for an energy storage cabinet provided by this application adopts the temperature control method for the energy storage cabinet described in the above embodiment. The temperature control device 20 includes a temperature regulation system 21, a cell temperature collector 22, a return water temperature collector 23, and a battery management system 24.

[0083] Please refer to Figure 3 , Figure 5 and Figure 6 , the temperature regulation system 21 includes two temperature regulation modules 211 and a heat exchange pipeline 212. Any one of the temperature regulation modules 211 includes a water outlet pipeline 2111, a return water pipeline 2112, a water pump 2113, a refrigeration unit 2114, a heating unit 2115, and a temperature regulation controller 2116. The water pump 2113, the refrigeration unit 2114, and the heating unit 2115 are connected in series. Blocking valves 2117 are provided on both the water outlet pipeline 2111 and the return water pipeline 2112. The temperature regulation controller 2116 is electrically connected to the water pump 2113, the refrigeration unit 2114, the heating unit 2115, and the blocking valve 2117. The temperature regulation controller 2116 is used to control the opening and closing of the water pump 2113, the refrigeration unit 2114, the heating unit 2115, and the blocking valve 2117; the heat exchange pipeline 212 includes two first-level pipelines 2121, and both of the two first-level pipelines 2121 are connected to the battery module 10 through a second-level pipeline 2122. The two first-level pipelines 2121 are respectively connected to the water outlet pipeline 2111 and the return water pipeline 2112.

[0084] In this way, the water pump 2113, the water outlet pipeline 2111, one of the first-level pipelines 2121 and the corresponding second-level pipeline 2122, the battery module 10, the other first-level pipeline 2121 and the corresponding second-level pipeline 2122, and the return water pipeline 2112 form a refrigeration / heating cycle system.

[0085] The cell temperature collector 22 is used to collect the cell temperature of the battery module 10; the return water temperature collector 23 is used to collect the return water temperature of the return water pipeline 2112.

[0086] The battery management system 24 is electrically connected to the cell temperature collector 22, the return water temperature collector 23, and the temperature regulation controller 2116. The battery management system 24 is used to send control instructions to the temperature regulation controller 2116 according to the temperature data collected by the cell temperature collector 22 and the return water temperature collector 23. The battery management system 24 is also used to confirm whether the energy storage cabinet enters the charge and discharge state.

[0087] Adopting the above relevant setting methods such as the temperature regulation system 21 and the heat exchange pipeline 212 can bring many beneficial effects, which are mainly reflected in the following aspects: First, the temperature control controller 2116 is electrically connected to the water pump 2113, the refrigeration unit 2114, the heating unit 2115, and the blocking valve 2117. It can accurately control the opening and closing of each component based on the data collected by the cell temperature collector 22 and the return water temperature collector 23, achieving precise temperature regulation of the battery module 10, ensuring that the cells operate within the optimal temperature range, and improving the battery performance and lifespan.

[0088] Second, the heat exchange pipeline 212 is designed such that two primary pipelines 2121 are connected to the battery module 10 through a secondary pipeline 2122, and are respectively connected to the water outlet pipeline 2111 and the water return pipeline 2112. This layout is beneficial for improving the heat exchange efficiency, enabling the coolant to absorb or release heat more evenly, and better maintaining the temperature stability of the battery module 10.

[0089] Third, the blocking valve 2117 on the water outlet pipeline 2111 and the water return pipeline 2112 can cut off the pipeline in a timely manner when needed, enabling the temperature control system 21 to switch the operating mode according to the actual situation, and ensuring the safe and stable operation of the system. At the same time, the water pump 2113, the refrigeration unit 2114, and the heating unit 2115 are connected in series and work together, further enhancing the reliability and stability of the system.

[0090] Fourth, the battery management system 24 reasonably controls the working state of the temperature control system 21 based on the temperature data, avoiding unnecessary refrigeration or heating, reducing energy consumption, improving the energy utilization efficiency of the entire system, and reducing the operating cost.

[0091] Fifth, the battery management system 24 is electrically connected to the cell temperature collector 22, the return water temperature collector 23, and the temperature control controller 2116, achieving real-time monitoring and automatic control of the temperature of the battery module 10, improving the intelligent level of the system, facilitating remote monitoring and fault diagnosis, being conducive to timely discovery and solution of temperature anomalies, and ensuring the normal operation of the battery module 10.

[0092] Please refer to Figure 4 also. The temperature control device 20 further includes an energy management system 25. The energy management system 25 is communicatively connected to the battery management system 24 and the two temperature control controllers 2116 of the temperature control system 21, and is used to send control instructions to the temperature control controller 2116 according to the information fed back by the battery management system 24.

[0093] An energy storage cabinet provided by this application includes the above-mentioned temperature control device 20.

[0094] Please refer to Figure 7, the energy storage cabinet includes a cabinet body 30 and a cabinet door 40. The cabinet body 30 includes a first chamber, a second chamber and an intermediate chamber. The intermediate chamber is arranged between the first chamber and the second chamber. A power converter 50 is installed in the intermediate chamber. Two temperature control modules 211 of the temperature control device 20 are arranged in the first chamber. A battery module 10 is installed in the second chamber.

[0095] In addition, in order to enhance the protection effect, a protective net 41 is provided on the cabinet door 40.

[0096] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0097] The above has introduced in detail the temperature control method, temperature control device and energy storage cabinet provided by the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the solution and its core idea of the present application. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. A temperature control method for an energy storage cabinet, which is applied to the energy storage cabinet. The energy storage cabinet includes a battery module and a temperature control system for regulating the temperature of the battery module. The temperature control system has a pure power mode, a first-stage refrigeration mode, a second-stage refrigeration mode, a first-stage heating mode, and a second-stage heating mode, and is characterized in that, The temperature control method includes: When the energy storage cabinet enters the charge and discharge state, obtain the cell temperature of the battery module and the return water temperature of the temperature control system; Judge whether the cell temperature is greater than the first set threshold; If the cell temperature is greater than the first set threshold, after controlling the temperature control system to operate in the second-stage refrigeration mode, control the temperature control system to operate in the second-stage refrigeration mode, the first-stage refrigeration mode or the pure power mode according to the difference between the first set threshold and the return water temperature; If the cell temperature is not greater than the first set threshold, judge whether the cell temperature is less than the second set threshold. If the cell temperature is less than the second set threshold, after controlling the temperature control system to operate in the second-stage heating mode, control the temperature control system to operate in the second-stage heating mode, the first-stage heating mode or the pure power mode according to the difference between the second set threshold and the return water temperature, where the second set threshold is less than the first set threshold.

2. The temperature control method according to claim 1, wherein, The step of controlling the temperature control system to operate in the second-stage refrigeration mode, the first-stage refrigeration mode or the pure power mode according to the difference between the first set threshold and the return water temperature includes: When the difference between the first set threshold and the return water temperature is within the first temperature range, control the temperature control system to operate in the second-stage refrigeration mode; When the difference between the first set threshold and the return water temperature is within the second temperature range, control the temperature control system to operate in the first-stage refrigeration mode; When the difference between the first set threshold and the return water temperature is within the third temperature range, control the temperature control system to operate in the pure power mode; Wherein, the value range of the first set threshold is -10 to 60 degrees Celsius, the first temperature range is 2 to 40 degrees Celsius, the second temperature range is 0.2 to 1 degree Celsius, and the third temperature range is -1 to -0.2 degrees Celsius.

3. The temperature control method according to claim 2, wherein, The temperature control method further includes: When the energy storage cabinet is in the standby state, obtain the cell temperature of the battery module; Judge whether the cell temperature is greater than the third set threshold. If the cell temperature is greater than the third set threshold, control the temperature control system to operate in the first-stage refrigeration mode until the cell temperature does not exceed the fourth set threshold, and then control the temperature control system to operate in the pure power mode. If the cell temperature is not greater than the third set threshold, control the temperature control system to stop operating, where the fourth set threshold is less than the third set threshold.

4. The temperature control method according to claim 1, characterized in that The step of controlling the temperature control system to operate in the second-stage heating mode, the first-stage heating mode or the pure power mode according to the difference between the second set threshold and the return water temperature includes: When the difference between the second set threshold and the return water temperature is within the fourth temperature range, control the temperature control system to operate in the pure power mode; When the difference between the second set threshold and the return water temperature is within the fifth temperature range, control the temperature control system to operate in the first-stage heating mode; When the difference between the second set threshold and the return water temperature is within the sixth temperature range, control the temperature control system to operate in the second-stage heating mode; Among them, the value range of the second set threshold is 0 to 20 degrees Celsius, the fourth temperature range is 0 to 40 degrees Celsius, the fifth temperature range is -5 to 0 degrees Celsius, and the sixth temperature range is -30 to -5 degrees Celsius.

5. The temperature control method according to claim 4, characterized in that, The temperature control method further includes: When the energy storage cabinet is in the standby state, obtain the core temperature of the battery module; Judge whether the core temperature is less than the fifth set threshold. If the core temperature is less than the fifth set threshold, control the temperature control system to operate in the first-stage heating mode until the core temperature exceeds the sixth set threshold, and then control the temperature control system to operate in the pure power mode, where the fifth set threshold is less than the sixth set threshold.

6. The temperature control method according to claim 1, characterized in that Before the step of controlling the temperature control system to operate in the second-stage cooling mode, the first-stage cooling mode or the pure power mode according to the difference between the first set threshold and the return water temperature, it further includes: Judge the change trend of the return water temperature; If the return water temperature is in a downward trend, the step of controlling the temperature control system to operate in the second-stage cooling mode, the first-stage cooling mode or the pure power mode according to the difference between the first set threshold and the return water temperature includes: When the difference between the first set threshold and the return water temperature is within the first temperature range, control the temperature control system to operate in the second-stage cooling mode; When the difference between the first set threshold and the return water temperature is within the second temperature range, control the temperature control system to operate in the first-stage cooling mode; When the difference between the first set threshold and the return water temperature is within the third temperature range, control the temperature control system to operate in the pure power mode; If the return water temperature is in an upward trend, the step of controlling the temperature control system to operate in the second-stage cooling mode, the first-stage cooling mode or the pure power mode according to the difference between the first set threshold and the return water temperature includes: When the difference between the first set threshold and the return water temperature is within the first temperature range, control the temperature control system to operate in the second-stage cooling mode; When the difference between the first set threshold and the return water temperature is within the seventh temperature range, control the temperature control system to operate in the first-stage cooling mode; When the difference between the first set threshold and the return water temperature is within the third temperature range, control the temperature control system to operate in the pure power mode; Among them, the first temperature range is 2 to 40 degrees Celsius, the second temperature range is 0.2 to 1 degree Celsius, the third temperature range is -1 to -0.2 degrees Celsius, and the seventh temperature range is 1.2 to 2 degrees Celsius.

7. The temperature control method according to claim 1, characterized in that, Before the step of controlling the temperature control system to operate in the second-stage heating mode, the first-stage heating mode or the pure power mode according to the difference between the second set threshold and the return water temperature, it further includes: Judge the change trend of the return water temperature; If the return water temperature is in an upward trend, the step of controlling the temperature control system to operate in the second-stage heating mode, the first-stage heating mode or the pure power mode according to the difference between the second set threshold and the return water temperature includes: When the difference between the second set threshold and the return water temperature is within the fourth temperature range, control the temperature regulation system to operate in a pure power mode; When the difference between the second set threshold and the return water temperature is within the fifth temperature range, control the temperature regulation system to operate in the first-stage heating mode; When the difference between the second set threshold and the return water temperature is within the sixth temperature range, control the temperature regulation system to operate in the second-stage heating mode; If the return water temperature is in a downward trend, then the step of controlling the temperature regulation system to operate in the second-stage heating mode, the first-stage heating mode, or the pure power mode according to the difference between the second set threshold and the return water temperature includes: When the difference between the second set threshold and the return water temperature is within the fourth temperature range, control the temperature regulation system to operate in a pure power mode; When the difference between the second set threshold and the return water temperature is within the fifth temperature range, control the temperature regulation system to operate in the first-stage heating mode; When the difference between the second set threshold and the return water temperature is within the eighth temperature range, control the temperature regulation system to operate in the second-stage heating mode; Wherein, the fourth temperature range is 0 to 40 degrees Celsius, the fifth temperature range is -5 to 0 degrees Celsius, the sixth temperature range is -30 to -5 degrees Celsius, and the eighth temperature range is -29 to -4 degrees Celsius.

8. A temperature control device for an energy storage cabinet, which adopts the temperature control method for an energy storage cabinet according to any one of claims 1-7, characterized in that, The temperature control device includes: A temperature regulation system, including two temperature regulation modules and a heat exchange pipeline. The temperature regulation module includes an outlet water pipeline, a return water pipeline, a water pump, a refrigeration unit, a heating unit, and a temperature regulation controller. The water pump, the refrigeration unit, and the heating unit are connected in series. Blocking valves are provided on both the outlet water pipeline and the return water pipeline. The temperature regulation controller is electrically connected to the water pump, the refrigeration unit, the heating unit, and the blocking valve. The temperature regulation controller is used to control the opening and closing of the water pump, the refrigeration unit, the heating unit, and the blocking valve. The heat exchange pipeline includes two first-stage pipelines, and both of the two first-stage pipelines are connected to the battery module through a second-stage pipeline. The two first-stage pipelines are respectively connected to the outlet water pipeline and the return water pipeline; A cell temperature collector, used to collect the cell temperature of the battery module; A return water temperature collector, used to collect the return water temperature of the return water pipeline; A battery management system, electrically connected to the cell temperature collector, the return water temperature collector, and the temperature regulation controller, and used to send a control instruction to the temperature regulation controller according to the temperature data collected by the cell temperature collector and the return water temperature collector.

9. An energy storage cabinet, characterized in that, Including the temperature control device as described in claim 8.

10. The energy storage cabinet according to claim 9, wherein, The energy storage cabinet further includes a cabinet body and a cabinet door. The cabinet body includes a first chamber, a second chamber, and an intermediate chamber. The intermediate chamber is provided between the first chamber and the second chamber. A power converter is installed in the intermediate chamber. The two temperature regulation modules of the temperature control device are provided in the first chamber, and the battery module is installed in the second chamber.

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