Temperature adjusting method and device of energy storage system

Abstract

The invention discloses a temperature adjusting method and device of an energy storage system. The method comprises the following steps: acquiring the highest temperature and the lowest temperature of a plurality of monomers in the energy storage device; determining a control target temperature of the energy storage device according to at least one of the maximum temperature and the minimum temperature; determining a temperature control difference value between the temperature control system and the energy storage device according to the environment humidity range of the energy storage device; and determining the liquid outlet temperature of the temperature control system according to the control target temperature and the temperature control difference value so as to adjust the temperature of the energy storage device. The liquid outlet temperature of the temperature control system, the control target temperature of the energy storage device and the dew point temperature of the current environment can be linked, and the speed and accuracy of temperature adjustment are improved. And the condensation phenomenon caused by the fact that the liquid outlet temperature of the temperature control system is smaller than the dew point temperature of the current environment can be avoided, the probability of abnormal system insulation caused by the condensation phenomenon of the energy storage system is reduced, and the safety of the energy storage system is improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of new energy technology, and in particular to a temperature regulation method and device for an energy storage system. Background Art

[0002] The liquid cooling system in the energy storage system usually uses liquid cooling medium to cool or heat the battery pack in the battery system, so that the battery system can work in a relatively balanced temperature environment. At present, the liquid cooling system mostly uses the outlet temperature or return water temperature as the control target, which makes the temperature control effect of the battery system less than ideal, and is prone to condensation, reducing the safety of the energy storage system. Summary of the invention

[0003] The present invention provides a temperature regulation method and device for an energy storage system, so as to improve the temperature control effect of the energy storage device and improve the safety of the energy storage system.

[0004] In a first aspect, an embodiment of the present invention provides a temperature adjustment method for an energy storage system, wherein the energy storage system includes an energy storage device, an energy storage management system, and a temperature control system; the energy storage management system is connected to the energy storage device, and the energy storage management system is connected to the temperature control system, and the control method includes:

[0005] Obtaining the highest temperature and the lowest temperature of a plurality of cells in the energy storage device;

[0006] determining a control target temperature of the energy storage device according to at least one of the maximum temperature and the minimum temperature;

[0007] Determining a temperature control difference between the temperature control system and the energy storage device according to an ambient humidity range of the energy storage device;

[0008] The liquid outlet temperature of the temperature control system is determined according to the control target temperature and the temperature control difference to adjust the temperature of the energy storage device.

[0009] Optionally, determining a temperature control difference between the temperature control system and the energy storage device according to an ambient humidity range of the energy storage device includes:

[0010] Determining a dew point temperature range according to an ambient humidity range of the energy storage device;

[0011] The temperature control difference is determined according to a minimum value of the dew point temperature range.

[0012] Optionally, determining the liquid outlet temperature of the temperature control system according to the control target temperature and the temperature control difference includes:

[0013] When the control target temperature is greater than the cooling start temperature of the temperature control system, controlling the temperature control system to enter a cooling mode;

[0014] Determining a lower limit value of the liquid outlet temperature of the temperature control system according to a difference between the control target temperature and the temperature control difference;

[0015] When the real-time liquid outlet temperature of the temperature control system is less than or equal to the lower limit of the liquid outlet temperature, the refrigeration output power of the temperature control system is limited.

[0016] Optionally, limiting the cooling output power of the temperature control system includes:

[0017] PC = PAC × (T0 - TS1) / TD1;

[0018] Among them, PC is the cooling output power of the temperature control system, PAC is the maximum cooling output power of the temperature control system, T0 is the control target temperature, TS1 is the cooling start temperature, and TD1 is the cooling control hysteresis of the temperature control system.

[0019] Optionally, determining the liquid outlet temperature of the temperature control system according to the control target temperature and the temperature control difference includes:

[0020] When the control target temperature is lower than the heating start temperature of the temperature control system, controlling the temperature control system to enter a heating mode;

[0021] Determine the upper limit value of the liquid outlet temperature of the temperature control system according to the sum of the control target temperature and the temperature control difference;

[0022] When the real-time liquid outlet temperature of the temperature control system is greater than the liquid outlet temperature upper limit, the heating output power of the temperature control system is limited.

[0023] Optionally, limiting the heating output power of the temperature control system includes:

[0024] PH = PAH × (TS2-T0) / TD2;

[0025] Among them, PH is the heating output power of the temperature control system, PAH is the maximum heating output power of the temperature control system, T0 is the control target temperature, TS2 is the heating start temperature, and TD2 is the heating control hysteresis of the temperature control system.

[0026] Optionally, determining a control target temperature of the energy storage device according to at least one of the maximum temperature and the minimum temperature includes:

[0027] The control target temperature of the energy storage device is determined according to the maximum temperature, the minimum temperature and a weight parameter; wherein the value range of the weight parameter is 0-1.

[0028] Optionally, before obtaining the maximum temperature and the minimum temperature of the battery cell in the energy storage device, the method further includes:

[0029] Verify the communication status between the energy storage management system and the temperature control system.

[0030] In a second aspect, an embodiment of the present invention further provides a temperature regulating device for an energy storage system, the energy storage system comprising an energy storage device, an energy storage management system and a temperature control system; the energy storage management system is connected to the energy storage device, the energy storage management system is connected to the temperature control system, and the device comprises:

[0031] An acquisition module, used to acquire the highest temperature and the lowest temperature of a plurality of cells of the energy storage device;

[0032] a control target temperature determination module, configured to determine a control target temperature of the energy storage device according to at least one of the maximum temperature and the minimum temperature;

[0033] A temperature control difference determination module, used to determine a temperature control difference between the temperature control system and the energy storage device according to an ambient humidity range of the energy storage device;

[0034] The regulating module is used to determine the outlet liquid temperature of the temperature control system according to the control target temperature and the temperature control difference, so as to regulate the temperature of the energy storage device.

[0035] Optionally, the energy storage system also includes an energy management system, which is connected to the energy storage management system and the temperature control system; the temperature adjustment device of the energy storage system is integrated into the energy storage management system, the temperature control system or the energy management system.

[0036] The technical solution of the embodiment of the present invention determines the control target temperature through at least one of the highest temperature and the lowest temperature of multiple monomers in the energy storage device, and determines the temperature control difference between the temperature control system and the energy storage device according to the environmental humidity range of the energy storage device; then determines the outlet temperature of the temperature control system according to the control target temperature and the temperature control difference, so that the outlet temperature of the temperature control system can be linked with the control target temperature of the energy storage device and the dew point temperature of the current environment, which can not only improve the responsiveness of the temperature regulation of the energy storage system, but also improve the rate and accuracy of temperature regulation. In addition, the dew point temperature can be introduced to adjust the outlet temperature of the temperature control system, and the difference between the outlet temperature of the temperature control system and the control target temperature is controlled to be less than the temperature control difference, thereby avoiding the condensation phenomenon caused by the outlet temperature of the temperature control system being less than the dew point temperature of the current environment, reducing the probability of system insulation abnormality of the energy storage system due to condensation, and improving the safety of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of the structure of an energy storage system provided by an embodiment of the present invention;

[0038] Figure 2 A flow chart of a temperature adjustment method for an energy storage system provided by an embodiment of the present invention;

[0039] Figure 3 A flow chart of another temperature adjustment method for an energy storage system provided by an embodiment of the present invention;

[0040] Figure 4 A flow chart of another temperature adjustment method for an energy storage system provided by an embodiment of the present invention;

[0041] Figure 5 A flow chart of another temperature adjustment method for an energy storage system provided by an embodiment of the present invention;

[0042] Figure 6 A flow chart of another temperature adjustment method for an energy storage system provided by an embodiment of the present invention;

[0043] Figure 7 A schematic structural diagram of a temperature regulating device for an energy storage system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0044] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0045] Figure 1A schematic diagram of the structure of an energy storage system provided by an embodiment of the present invention. Figure 1 As shown, the energy storage system may include an energy storage device 101 , an energy storage management system 102 and a temperature control system 103 ; the energy storage management system 102 is connected to the energy storage device 101 , and the energy storage management system 102 is connected to the temperature control system 103 .

[0046] Specifically, the energy storage device 101 may be a battery pack. The battery pack may have a plurality of interconnected battery cells. The energy storage management system 102 is connected to the energy storage device 101 and is used to monitor the state of the energy storage device 101. Exemplarily, when the energy storage device 101 is a battery pack, the energy storage management system 102 may be a battery management system (BMS). The temperature control system 103 may be arranged around the energy storage device 101 and is used to control the temperature of the energy storage device 101 so that the energy storage device 101 can work in an environment with a relatively balanced temperature and ensure the safety of the energy storage device 101. Exemplarily, the temperature control system 103 may be a liquid cooling system. By controlling the temperature of the energy storage device 101 through the liquid cooling system, the energy storage device 101 can work in an environment with a relatively balanced temperature. Moreover, the temperature control system 103 is connected to the energy storage management system 102 to achieve communication between the two. An embodiment of the present invention provides a temperature adjustment method for an energy storage system, which is used to control the temperature of the energy storage device 101 in the energy storage system. The method may be performed by a temperature adjustment device of the energy storage system. The temperature adjustment device of the energy storage system may be integrated into the energy storage management system 102 or the temperature control system 103. When the temperature adjustment device of the energy storage system is integrated into the energy storage management system 102, the energy storage management system 102 may send a control signal to the temperature control system 103, so that the temperature control system 103 may adjust the temperature of the energy storage device 101 according to the control signal. When the temperature adjustment device of the energy storage system is integrated into the temperature control system 103, the temperature control system 103 may obtain the status signal of the energy storage device 101 through the energy storage management system 102, and adjust the temperature of the energy storage device 101 according to the status signal of the energy storage device 101. In addition, when the energy storage system also includes an energy management system, the temperature adjustment device of the energy storage system may also be integrated into the energy management system. The energy management system may obtain the status signal of the energy storage device 101 through the energy storage management system 102, and control the temperature control system 103 to adjust the temperature of the energy storage device 101 according to the status signal of the energy storage device 101.

[0047] Figure 2 A flow chart of a temperature adjustment method for an energy storage system provided in an embodiment of the present invention, such as Figure 1 and Figure 2 As shown, the method includes:

[0048] S110, obtaining the highest temperature and the lowest temperature of multiple monomers in the energy storage device;

[0049] Among them, the energy storage device 101 includes multiple monomers, and the temperature control system 103 can be arranged around the multiple monomers. When the temperature control system 103 controls the temperature of the energy storage device 101, the temperature of the monomer close to the temperature control system 103 is closer to the liquid outlet temperature of the temperature control system 103 than the temperature of the monomer far away from the temperature control system 103. Exemplarily, when the temperature control system 103 is a liquid cooling system, and the energy storage device 101 is liquid cooled, the temperature of the monomer close to the liquid cooling system is lower than the temperature of the monomer far away from the liquid cooling system. The energy storage management system can obtain the temperatures of multiple monomers in the energy storage device respectively, and determine the highest and lowest temperatures of all monomers according to the temperatures of the multiple monomers. When the temperature adjustment method of the energy storage system provided in an embodiment of the present invention is executed by a temperature control system or an energy management system, the temperature control system or the energy management system is communicated with the energy storage management system to obtain the highest and lowest temperatures of the monomers in the energy storage management system.

[0050] S120, determining a control target temperature of the energy storage device according to at least one of the maximum temperature and the minimum temperature;

[0051] Among them, after obtaining the maximum temperature and the minimum temperature of the monomer, the control target temperature of the energy storage device can be determined by at least one of the maximum temperature and the minimum temperature of the monomer to characterize the current temperature of the energy storage device, so that the control target temperature is linked to the temperature of the energy storage device.

[0052] S130, determining a temperature control difference between the temperature control system and the energy storage device according to an ambient humidity range of the energy storage device;

[0053] Among them, different ambient humidity ranges correspond to different dew point temperature ranges. When the ambient humidity range is constant, different temperatures of the energy storage device correspond to different dew point temperatures. When the ambient humidity range is constant, the difference between a certain temperature of the energy storage device and its corresponding dew point temperature can be used as a temperature control difference. When the ambient humidity range is constant, the temperature control difference can be determined based on the temperature of the energy storage device and the dew point temperature range, so that the temperature control difference is linked to the dew point temperature of the energy storage device.

[0054] S140, determining the liquid outlet temperature of the temperature control system according to the control target temperature and the temperature control difference to adjust the temperature of the energy storage device.

[0055] Among them, after determining the control target temperature and the temperature control difference, the outlet temperature of the temperature control system is determined according to the control target temperature and the temperature control difference, so that the outlet temperature of the temperature control system adjusts the temperature of the energy storage device. Therefore, the temperature of the temperature energy storage device can be adjusted according to the current temperature of the energy storage device and the dew point temperature in the current environment, which can not only improve the responsiveness of the temperature regulation of the energy storage system, but also improve the rate and accuracy of temperature regulation. In addition, the dew point temperature can be introduced to adjust the outlet temperature of the temperature control system, and the difference between the outlet temperature of the temperature control system and the control target temperature is controlled to be less than the temperature control difference, thereby avoiding the condensation phenomenon caused by the outlet temperature of the temperature control system being less than the dew point temperature of the current environment, reducing the probability of system insulation abnormality of the energy storage system due to condensation, and improving the safety of the energy storage system.

[0056] The technical solution of this embodiment determines the control target temperature through at least one of the highest temperature and the lowest temperature of multiple monomers in the energy storage device, and determines the temperature control difference between the temperature control system and the energy storage device according to the environmental humidity range of the energy storage device; then determines the outlet temperature of the temperature control system according to the control target temperature and the temperature control difference, so that the outlet temperature of the temperature control system can be linked with the control target temperature of the energy storage device and the dew point temperature of the current environment, which can not only improve the responsiveness of the temperature regulation of the energy storage system, but also improve the rate and accuracy of temperature regulation. In addition, the dew point temperature can be introduced to adjust the outlet temperature of the temperature control system, and the difference between the outlet temperature of the temperature control system and the control target temperature is controlled to be less than the temperature control difference, thereby avoiding the condensation phenomenon caused by the outlet temperature of the temperature control system being less than the dew point temperature of the current environment, reducing the probability of system insulation abnormality of the energy storage system due to condensation, and improving the safety of the energy storage system.

[0057] In some embodiments, determining the temperature control difference between the temperature control system and the energy storage device according to the ambient humidity range of the energy storage device includes:

[0058] Determine the dew point temperature range according to the ambient humidity range of the energy storage device;

[0059] The dew point temperature is related to the ambient humidity and ambient temperature of the energy storage device. After determining the ambient humidity range of the energy storage device, the relationship between the dew point temperature and the ambient temperature of the energy storage device can be determined according to the current ambient humidity range, thereby determining the dew point temperature range.

[0060] The temperature control differential is determined based on the minimum value of the dew point temperature range.

[0061] Among them, after determining the dew point temperature range, the minimum value within the dew point temperature range can be determined as the temperature control difference. Exemplarily, when the ambient humidity range is certain, the difference between the minimum temperature value within the temperature range of the energy storage device and its corresponding dew point temperature can be selected as the temperature control difference. When the difference between the outlet liquid temperature of the temperature control system and the control target temperature of the energy storage device is less than the temperature control difference, it can be ensured that within the current ambient humidity range, the outlet liquid temperature of the temperature control system is greater than the dew point temperature, thereby avoiding condensation of the energy storage device, reducing the probability of system insulation abnormality caused by condensation in the energy storage system, and improving the safety of the energy storage system.

[0062] In some embodiments, environmental parameters such as ambient humidity and ambient temperature of the energy storage device can also be obtained in real time, and the current dew point temperature can be calculated. Then, a suitable value is selected according to the calculated dew point temperature as the temperature control difference of the energy storage device, which is used to adjust the outlet temperature of the temperature control system. Alternatively, a fixed temperature control difference can be determined by theoretical analysis of condensation of the energy storage device, and used as the temperature control difference of the energy storage device. This is not limited here.

[0063] Figure 3 A flow chart of another temperature adjustment method for an energy storage system provided by an embodiment of the present invention, such as Figure 3 As shown, the method includes:

[0064] S210, obtaining the highest temperature and the lowest temperature of multiple monomers in the energy storage device;

[0065] S220, determining a control target temperature of the energy storage device according to at least one of the maximum temperature and the minimum temperature;

[0066] S230, determining a temperature control difference between the temperature control system and the energy storage device according to an ambient humidity range of the energy storage device;

[0067] S240, when the control target temperature is greater than the cooling start temperature of the temperature control system, controlling the temperature control system to enter a cooling mode;

[0068] The cooling start temperature is used to characterize the conditions for the temperature control system to start the cooling mode. When the control target temperature is greater than the cooling start temperature of the temperature control system, the current temperature of the energy storage device is relatively high, which meets the conditions for the temperature control system to start the cooling mode, so that the temperature control system enters the cooling mode and can reduce the temperature of the energy storage device through heat exchange, thereby achieving the cooling regulation of the energy storage device.

[0069] S250, determining a lower limit value of the liquid outlet temperature of the temperature control system according to the difference between the control target temperature and the temperature control difference;

[0070] Among them, in the cooling mode, the lower limit value of the outlet temperature of the temperature control system is T1 = T0-T2; wherein T0 is the control target temperature of the energy storage device, and T2 is the temperature control difference between the temperature control system and the energy storage device. When the outlet temperature of the temperature control system is greater than T1, the temperature difference between the temperature control system and the energy storage device is less than the dew point temperature within the current ambient humidity range, which can avoid condensation of the energy storage device.

[0071] S260: When the real-time outlet liquid temperature of the temperature control system is less than or equal to the lower limit of the outlet liquid temperature, limit the cooling output power of the temperature control system.

[0072] Among them, in the cooling mode, the outlet temperature of the temperature control system can be obtained in real time. When the real-time outlet temperature of the temperature control system is less than or equal to the lower limit of the outlet temperature, the cooling output power of the temperature control system can be limited, the cooling effect of the temperature control system can be reduced, the power self-regulation of the temperature control system is realized, and the probability of condensation in the energy storage device caused by the continuous decrease in the outlet temperature of the temperature control system is reduced.

[0073] In some embodiments, limiting the cooling output power of the temperature control system includes:

[0074] PC = PAC × (T0 - TS1) / TD1;

[0075] Among them, PC is the cooling output power of the temperature control system, PAC is the maximum cooling output power of the temperature control system, T0 is the control target temperature, TS1 is the cooling start temperature, and TD1 is the cooling control hysteresis of the temperature control system.

[0076] Among them, when limiting the cooling output power of the temperature control system, the ratio of the cooling output power to the maximum cooling output power can be determined according to the difference between the control target temperature and the cooling start temperature and the cooling control hysteresis of the temperature control system. Therefore, the cooling output power of the temperature control system can be automatically adjusted according to the difference between the control target temperature and the cooling start temperature, so as to realize a gradual increase or decrease of the cooling output power within the cooling hysteresis range, thereby improving the convenience of temperature regulation of the energy storage system.

[0077] It should be noted that the upper limit of the outlet liquid temperature of the temperature control system can also be limited according to the maximum refrigeration output power of the temperature control system, the refrigeration start temperature and the refrigeration control hysteresis. Specifically, when the difference between the control target temperature and the refrigeration start temperature is equal to the refrigeration control hysteresis of the temperature control system, the refrigeration output power of the temperature control system is the maximum refrigeration output power of the temperature control system, and the control target temperature at this time is the upper limit of the outlet liquid temperature. Therefore, when the control target temperature is less than or equal to the upper limit of the outlet liquid temperature, the refrigeration output power of the temperature control system can be adjusted according to the control target temperature. When the control target temperature is greater than the upper limit of the outlet liquid temperature, the refrigeration output power of the temperature control system reaches the maximum refrigeration output power, and the outlet liquid temperature of the temperature control system increases with the increase of the control target temperature.

[0078] In some embodiments, when the real-time liquid outlet temperature of the temperature control system is greater than the lower limit of the liquid outlet temperature, the temperature control system can be made to output normal power according to the control target temperature.

[0079] Figure 4 A flow chart of another temperature adjustment method for an energy storage system provided by an embodiment of the present invention, such as Figure 4 As shown, the method includes:

[0080] S310, obtaining the highest temperature and the lowest temperature of multiple monomers in the energy storage device;

[0081] S320, determining a control target temperature of the energy storage device according to at least one of the maximum temperature and the minimum temperature;

[0082] S330, determining a temperature control difference between the temperature control system and the energy storage device according to an ambient humidity range of the energy storage device;

[0083] S340, when the control target temperature is lower than the heating start temperature of the temperature control system, controlling the temperature control system to enter a heating mode;

[0084] The heating start temperature is used to characterize the conditions for the temperature control system to start the heating mode. When the control target temperature is lower than the heating start temperature of the temperature control system, the current temperature of the energy storage device is relatively low, which satisfies the conditions for the temperature control system to start the heating mode, so that the temperature control system enters the heating mode and the temperature of the energy storage device can be increased by heat exchange to achieve temperature regulation of the energy storage device.

[0085] S350, determining the upper limit value of the liquid outlet temperature of the temperature control system according to the sum of the control target temperature and the temperature control difference;

[0086] Among them, in the heating mode, the upper limit value of the outlet temperature of the temperature control system is T3 = T0 + T2; wherein T0 is the control target temperature of the energy storage device, and T2 is the temperature control difference between the temperature control system and the energy storage device. When the outlet temperature of the temperature control system is less than T3, the temperature difference between the outlet temperature of the temperature control system and the energy storage device is less than the dew point temperature within the current ambient humidity range, which can avoid condensation of the energy storage device.

[0087] S360: When the real-time outlet liquid temperature of the temperature control system is greater than the upper limit of the outlet liquid temperature, the heating output power of the temperature control system is limited.

[0088] Among them, in the heating mode, the outlet temperature of the temperature control system can be obtained in real time. When the real-time outlet temperature of the temperature control system is greater than the upper limit of the outlet temperature, the heating output power of the temperature control system can be limited to reduce the heating effect of the temperature control system, thereby realizing the power self-regulation of the temperature control system and preventing the safety hazard of the energy storage device caused by the excessively high outlet temperature of the temperature control system.

[0089] In some embodiments, limiting the heating output power of the temperature control system includes:

[0090] PH = PAH × (TS2-T0) / TD2;

[0091] Among them, PH is the heating output power of the temperature control system, PAH is the maximum heating output power of the temperature control system, T0 is the control target temperature, TS2 is the heating start temperature, and TD2 is the heating control hysteresis of the temperature control system.

[0092] Specifically, when limiting the heating output power of the temperature control system, the ratio of the heating output power to the maximum heating output power can be determined according to the difference between the heating start temperature and the control target temperature and the heating control hysteresis of the temperature control system. Therefore, the heating output power of the temperature control system can be automatically adjusted according to the difference between the heating start temperature and the control target temperature, so as to achieve a gradual increase or decrease in the heating output power within the heating hysteresis range, thereby improving the convenience of temperature regulation of the energy storage system.

[0093] In some embodiments, when the real-time liquid outlet temperature of the temperature control system is less than the upper limit of the liquid outlet temperature, the temperature control system can be made to output normal power according to the control target temperature.

[0094] In some embodiments, determining a control target temperature of the energy storage device according to at least one of a maximum temperature and a minimum temperature includes:

[0095] The control target temperature of the energy storage device is determined according to the maximum temperature, the minimum temperature and the weight parameter; wherein the value range of the weight parameter is 0-1.

[0096] Specifically, the weight parameter may be a characteristic factor of the energy storage system. Control target temperature T0=T4+k(T5-T4), where T0 is the control target temperature, T4 is the lowest temperature of multiple monomers in the energy storage device, T5 is the highest temperature of multiple monomers in the energy storage device, and k is a weight parameter. The value range of the weight parameter is 0-1, which can make the control target temperature slide between the highest temperature and the lowest temperature of multiple monomers in the energy storage device. And by adjusting the value of the weight parameter, the temperature adjustment speed can be adjusted, so that the advance or lag of temperature adjustment can be achieved to adapt to different application scenarios and physical characteristics of the energy storage system, and the compatibility of the temperature adjustment method is achieved. Exemplarily, when the weight parameter is 0, the lowest temperature of multiple monomers in the energy storage device can be directly used as the control target temperature. When the weight parameter is 1, the highest temperature of multiple monomers in the energy storage device can be directly used as the control target temperature. When the weight parameter is 0.5, the average value of the lowest temperature and the highest temperature of multiple monomers in the energy storage device can be used as the control target temperature.

[0097] In some embodiments, before obtaining the maximum temperature and the minimum temperature of the battery cell in the energy storage device, the method further includes:

[0098] Verify the communication status of the energy storage management system and the temperature control system.

[0099] Specifically, when the temperature adjustment method of the energy storage system is executed by the temperature control system, the temperature control system needs to obtain the highest temperature and the lowest temperature of multiple monomers in the energy storage device from the energy storage management system. Before the temperature control system obtains the highest temperature and the lowest temperature of multiple monomers in the energy storage device, it is necessary to verify the communication status of the energy storage management system and the temperature control system. When the communication status between the energy storage management system and the temperature control system is normal, the temperature control system can obtain the highest temperature and the lowest temperature of multiple monomers in the energy storage device from the energy storage management system to achieve data interaction for temperature adjustment of the energy storage system. Exemplarily, the communication method between the energy storage management system and the temperature control system can be CAN communication, RS485 communication, Ethernet communication, etc.

[0100] It should be noted that when the temperature adjustment method of the energy storage system is executed by the energy storage management system, the communication status between the energy storage management system and the temperature control system can realize the interaction of control instructions for controlling the temperature control system to realize temperature adjustment of the energy storage system.

[0101] In some embodiments, the temperature adjustment method of the energy storage system may further include a local control mode. When the communication status check between the energy storage management system and the temperature control system fails, the data source of the temperature control system is lost, and the temperature control system may execute the local control mode to adjust the temperature of the energy storage system.

[0102] In some embodiments, when the energy storage device is a battery cell, the temperature adjustment method of the energy storage system is performed by the temperature adjustment device of the energy storage system, and the temperature adjustment device of the energy storage system is integrated into the temperature control system. Figure 5 A flow chart of another temperature adjustment method for an energy storage system provided by an embodiment of the present invention, such as Figure 5 As shown, taking the temperature control system as a liquid cooling system as an example, the method includes:

[0103] After the liquid cooling system is running, it can be determined whether it is in the battery cell control mode. If yes, communication management is performed with the energy storage management system. If no, temperature adjustment is performed through the local control mode. The data interaction module between the energy storage management system and the liquid cooling system summarizes the highest and lowest temperatures of each cluster of battery cells obtained by the energy storage management system, and determines the average of the highest temperature of each cluster of battery cells as the highest temperature of multiple monomers, and the average of the lowest temperature of each cluster of battery cells as the lowest temperature of multiple monomers, and can output data to the liquid cooling system through communication. Determine whether the communication between the liquid cooling system and the energy storage management system is normal. If yes, the control target temperature T0 can be calculated through the highest and lowest temperatures obtained through data interaction. If no, it is determined that the data source of the liquid cooling system is lost, and temperature adjustment is performed through the local control mode. After determining the control target temperature T0, it is determined whether the control target temperature T0 is greater than or equal to the cooling start temperature. If yes, the liquid cooling system starts the cooling mode. Then it is determined whether the outlet temperature of the liquid cooling system is less than or equal to the lower limit of the outlet temperature. If yes, the cooling output power of the liquid cooling system is limited. If no, the liquid cooling system outputs normal power. When the control target temperature is lower than the cooling start temperature, it can be determined whether the control target temperature is lower than the heating start temperature. If so, the liquid cooling system starts the heating mode. Then it is determined whether the liquid outlet temperature of the liquid cooling system is greater than or equal to the upper limit of the liquid outlet temperature. If so, the heating output power of the liquid cooling system is limited. If not, the liquid cooling system outputs normal power. When the control target temperature is higher than the heating start temperature, the liquid cooling system enters the circulation mode.

[0104] It should be noted that the control target temperature can also be calculated by the energy storage management system based on the maximum temperature and the minimum temperature of the monomer. In this case, the liquid cooling system can directly obtain the control target temperature from the energy storage management system for temperature regulation of the energy storage system.

[0105] For example, the temperature control system is a liquid cooling system, and the temperature adjustment method of the energy storage system is performed by the liquid cooling system. The cooling start temperature of the liquid cooling system can be set to 28°C, the heating start temperature can be set to 10°C, the cooling control hysteresis and heating control hysteresis of the liquid cooling system are both 2°C, and when the humidity of the liquid cooling system is less than or equal to 50%RH, 50%RH is taken as the maximum humidity value of the liquid cooling system, and 10°C is selected as the temperature control difference between the liquid cooling system and the battery cell through calculation. Then, the lower limit of the liquid outlet temperature of the liquid cooling system in the cooling mode can be calculated to be 18°C, and the upper limit of the liquid outlet temperature of the liquid cooling system in the heating mode can be calculated to be the sum of the control target temperature and 10°C, and the maximum temperature can be set to 30°C.

[0106] Figure 6 A flow chart of another temperature adjustment method for an energy storage system provided by an embodiment of the present invention, such as Figure 6 As shown, the method includes:

[0107] After the liquid cooling system is running, it can be determined whether it is in the cell control mode. If yes, it communicates with the energy storage management system for management. If no, it adjusts the temperature through the local control mode. The data interaction module between the energy storage management system and the liquid cooling system can calculate the average cell temperature based on the highest and lowest temperatures of the cell as the control target temperature T0. And it can output data to the liquid cooling system through communication. Determine whether the communication between the liquid cooling system and the energy storage management system is normal. If yes, the liquid cooling system obtains the average cell temperature from the energy storage management system as the control target temperature T0. If no, it is determined that the data source of the liquid cooling system is lost, and the temperature is adjusted through the local control mode. After determining the control target temperature T0, it is determined whether the control target temperature is greater than or equal to 28°C. If yes, the liquid cooling system starts the cooling mode. Then it is determined whether the liquid outlet temperature of the liquid cooling system is less than or equal to the difference between the control target temperature and 10°C. If yes, the cooling output power of the liquid cooling system is limited. If no, the liquid cooling system outputs normal power. When the control target temperature is less than 28°C, it can be determined whether the control target temperature is less than 10°C. If yes, the liquid cooling system starts the heating mode. Then determine whether the liquid outlet temperature of the liquid cooling system is greater than or equal to the sum of the control target temperature and 10°C. If yes, the heating output power of the liquid cooling system is limited. If not, the liquid cooling system outputs normal power. When the control target temperature is greater than 10°C and less than 28°C, the liquid cooling system enters the circulation mode.

[0108] The embodiment of the present invention also provides a temperature regulating device of an energy storage system, which is used to regulate the temperature of the energy storage system. The energy storage system includes an energy storage device, an energy storage management system and a temperature control system; the energy storage management system is connected to the energy storage device, and the energy storage management system is connected to the temperature control system. Figure 7 A schematic diagram of the structure of a temperature regulating device for an energy storage system provided by an embodiment of the present invention. Figure 7 As shown, the device comprises:

[0109] An acquisition module 10 is used to acquire the highest temperature and the lowest temperature of multiple cells of the energy storage device;

[0110] A control target temperature determination module 20, configured to determine a control target temperature of the energy storage device according to at least one of a maximum temperature and a minimum temperature;

[0111] A temperature control difference determination module 30, for determining a temperature control difference between a temperature control system and an energy storage device according to an ambient humidity range of the energy storage device;

[0112] The regulating module 40 is used to determine the outlet temperature of the temperature control system according to the control target temperature and the temperature control difference, so as to regulate the temperature of the energy storage device.

[0113] The technical solution of this embodiment determines the control target temperature of the energy storage device according to at least one of the highest temperature and the lowest temperature through the control target temperature determination module, and at the same time, the temperature control difference determination module determines the temperature control difference between the temperature control system and the energy storage device according to the environmental humidity range of the energy storage device. Then the adjustment module determines the outlet liquid temperature of the temperature control system according to the control target temperature and the temperature control difference, so that the outlet liquid temperature of the temperature control system can be linked with the control target temperature of the energy storage device and the dew point temperature of the current environment, which can not only improve the responsiveness of the temperature regulation of the energy storage system, but also improve the rate and accuracy of temperature regulation. In addition, the dew point temperature can be introduced to adjust the outlet liquid temperature of the temperature control system, and the difference between the outlet liquid temperature of the temperature control system and the control target temperature is controlled to be less than the temperature control difference, thereby avoiding the condensation phenomenon caused by the outlet liquid temperature of the temperature control system being less than the dew point temperature of the current environment, reducing the probability of system insulation abnormality of the energy storage system due to condensation, and improving the safety of the energy storage system.

[0114] In some embodiments, the temperature control difference determination module includes:

[0115] A dew point temperature determination unit, used to determine a dew point temperature range according to an ambient humidity range of the energy storage device;

[0116] The temperature control difference determination unit is used to determine the temperature control difference according to the minimum value of the dew point temperature range.

[0117] In some embodiments, the adjustment module includes:

[0118] A first control unit, configured to control the temperature control system to enter a cooling mode when the control target temperature is greater than a cooling start temperature of the temperature control system;

[0119] A lower limit value determination unit, used to determine a lower limit value of the liquid outlet temperature of the temperature control system according to a difference between the control target temperature and the temperature control difference value;

[0120] The first power limiting unit is used to limit the refrigeration output power of the temperature control system when the real-time outlet liquid temperature of the temperature control system is less than or equal to the lower limit of the outlet liquid temperature.

[0121] In some embodiments, the first power limiting unit is specifically configured to:

[0122] PC = PAC × (T0 - TS1) / TD1;

[0123] Among them, PC is the cooling output power of the temperature control system, PAC is the maximum cooling output power of the temperature control system, T0 is the control target temperature, TS1 is the cooling start temperature, and TD1 is the cooling control hysteresis of the temperature control system.

[0124] In some embodiments, the adjustment module includes:

[0125] A second control unit is used to control the temperature control system to enter a heating mode when the control target temperature is lower than the heating start temperature of the temperature control system;

[0126] An upper limit value determination unit, used to determine an upper limit value of the outlet temperature of the temperature control system according to the sum of the control target temperature and the temperature control difference;

[0127] The second power limiting unit is used to limit the heating output power of the temperature control system when the real-time outlet liquid temperature of the temperature control system is greater than the upper limit value of the outlet liquid temperature.

[0128] In some embodiments, the second power limiting unit is specifically configured to:

[0129] PH = PAH × (TS2-T0) / TD2;

[0130] Among them, PH is the heating output power of the temperature control system, PAH is the maximum heating output power of the temperature control system, T0 is the control target temperature, TS2 is the heating start temperature, and TD2 is the heating control hysteresis of the temperature control system.

[0131] In some embodiments, the control target temperature determination module is specifically used to determine the control target temperature of the energy storage device according to the maximum temperature, the minimum temperature and the weight parameter; wherein the value range of the weight parameter is 0-1.

[0132] In some embodiments, the temperature regulating device of the energy storage system further comprises:

[0133] The verification module is used to verify the communication status between the energy storage management system and the temperature control system.

[0134] In some embodiments, the temperature adjustment device of the energy storage system may be integrated into the energy storage management system or the temperature control system. When the temperature adjustment device of the energy storage system is integrated into the energy storage management system, the energy storage management system may execute the temperature adjustment method of the energy storage system provided in any embodiment of the present invention, form a control signal, and send the control signal to the temperature control system, so that the temperature control system can adjust the temperature of the energy storage device according to the control signal. When the temperature adjustment device of the energy storage system is integrated into the temperature control system, the temperature control system can obtain the highest and lowest temperatures of multiple monomers in the energy storage device through the energy storage management system, and execute the temperature adjustment method of the energy storage system provided in any embodiment of the present invention to adjust the temperature of the energy storage device.

[0135] In some embodiments, the energy storage system further includes an energy management system, which is connected to the energy storage management system and the temperature control system; the temperature adjustment device of the energy storage system may also be integrated into the energy management system. The energy management system may obtain the highest temperature and the lowest temperature of multiple monomers in the energy storage device through the energy storage management system, and execute the temperature adjustment method of the energy storage system provided in any embodiment of the present invention, form a control signal, and send the control signal to the temperature control system, so that the temperature control system can adjust the temperature of the energy storage device according to the control signal.

[0136] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A temperature regulation method for an energy storage system, characterized in that: The energy storage system includes an energy storage device, an energy storage management system and a temperature control system; The energy storage management system is connected to the energy storage device, and the energy storage management system is connected to the temperature control system. The control method includes: Obtaining the highest temperature and the lowest temperature of a plurality of cells in the energy storage device; determining a control target temperature of the energy storage device according to at least one of the maximum temperature and the minimum temperature; Determining a temperature control difference between the temperature control system and the energy storage device according to an ambient humidity range of the energy storage device; The liquid outlet temperature of the temperature control system is determined according to the control target temperature and the temperature control difference to adjust the temperature of the energy storage device.

2. The temperature adjustment method of the energy storage system according to claim 1, characterized in that: Determining a temperature control difference between the temperature control system and the energy storage device according to an ambient humidity range of the energy storage device includes: Determining a dew point temperature range according to an ambient humidity range of the energy storage device; The temperature control difference is determined according to a minimum value of the dew point temperature range.

3. The temperature adjustment method of the energy storage system according to claim 1, characterized in that: Determining the liquid outlet temperature of the temperature control system according to the control target temperature and the temperature control difference includes: When the control target temperature is greater than the cooling start temperature of the temperature control system, controlling the temperature control system to enter a cooling mode; Determining a lower limit value of the liquid outlet temperature of the temperature control system according to a difference between the control target temperature and the temperature control difference; When the real-time liquid outlet temperature of the temperature control system is less than or equal to the lower limit of the liquid outlet temperature, the refrigeration output power of the temperature control system is limited.

4. The temperature adjustment method of the energy storage system according to claim 3, characterized in that: Limiting the cooling output power of the temperature control system includes: PC = PAC × (T0 - TS1) / TD1; Among them, PC is the cooling output power of the temperature control system, PAC is the maximum cooling output power of the temperature control system, T0 is the control target temperature, TS1 is the cooling start temperature, and TD1 is the cooling control hysteresis of the temperature control system.

5. The temperature adjustment method of the energy storage system according to claim 1, characterized in that: Determining the liquid outlet temperature of the temperature control system according to the control target temperature and the temperature control difference includes: When the control target temperature is lower than the heating start temperature of the temperature control system, controlling the temperature control system to enter a heating mode; Determine the upper limit value of the liquid outlet temperature of the temperature control system according to the sum of the control target temperature and the temperature control difference; When the real-time liquid outlet temperature of the temperature control system is greater than the liquid outlet temperature upper limit, the heating output power of the temperature control system is limited.

6. The temperature adjustment method of the energy storage system according to claim 5, characterized in that: Limiting the heating output power of the temperature control system includes: PH = PAH × (TS2-T0) / TD2; Among them, PH is the heating output power of the temperature control system, PAH is the maximum heating output power of the temperature control system, T0 is the control target temperature, TS2 is the heating start temperature, and TD2 is the heating control hysteresis of the temperature control system.

7. The temperature adjustment method of the energy storage system according to claim 1, characterized in that: Determining a control target temperature of the energy storage device according to at least one of the maximum temperature and the minimum temperature includes: The control target temperature of the energy storage device is determined according to the maximum temperature, the minimum temperature and a weight parameter; wherein the value range of the weight parameter is 0-1.

8. The temperature adjustment method of the energy storage system according to claim 1, characterized in that: Before obtaining the maximum temperature and the minimum temperature of the battery cell in the energy storage device, the method further includes: Verify the communication status between the energy storage management system and the temperature control system.

9. A temperature regulating device for an energy storage system, characterized in that: The energy storage system includes an energy storage device, an energy storage management system and a temperature control system; The energy storage management system is connected to the energy storage device, and the energy storage management system is connected to the temperature control system. The device includes: An acquisition module, used to acquire the highest temperature and the lowest temperature of a plurality of cells of the energy storage device; a control target temperature determination module, configured to determine a control target temperature of the energy storage device according to at least one of the maximum temperature and the minimum temperature; A temperature control difference determination module, used to determine the temperature control difference between the temperature control system and the energy storage device according to the ambient humidity range of the energy storage device; The regulating module is used to determine the outlet liquid temperature of the temperature control system according to the control target temperature and the temperature control difference, so as to regulate the temperature of the energy storage device.

10. The temperature regulating device of the energy storage system according to claim 9, characterized in that: The energy storage system also includes an energy management system, which is connected to the energy storage management system and the temperature control system; the temperature adjustment device of the energy storage system is integrated into the energy storage management system, the temperature control system or the energy management system.

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