A method and device for temperature control of an energy storage high-voltage box

Abstract

This invention discloses a temperature control method and device for an energy storage high-voltage box. Based on the pre-configured cell capacity specifications and charge / discharge rates of the energy storage system, a target operating condition parameter set is determined from multiple operating condition parameter sets. The temperatures of multiple temperature acquisition points at different locations within the energy storage high-voltage box are periodically acquired to determine the highest temperature, and a target temperature strategy level is determined based on the preset temperature range of the highest temperature. The flow rate of the coolant flowing through the energy storage high-voltage box is adjusted according to the liquid cooling adjustment parameters corresponding to the target temperature strategy level in the target operating condition parameter set. As the temperature strategy level increases, the coolant flow rate gradually increases, remaining constant after reaching a preset maximum flow rate. This ensures that the coolant flow rate is matched to the cell configuration, charge / discharge conditions, and real-time temperature within the box, enhancing heat dissipation when temperatures rise, reducing unnecessary cooling energy consumption at low temperatures, and mitigating the impact of excessively high local temperatures on the operational reliability of high-voltage electrical components.

Description

Technical Field

[0001] This invention relates to the field of thermal management of energy storage systems, and in particular to a temperature control method and device for an energy storage high-voltage box. Background Technology

[0002] Energy storage systems typically consist of multiple battery clusters, energy storage converters, and a high-voltage storage box connecting the battery clusters and the energy storage converters. The high-voltage storage box contains high-voltage electrical components such as fuses, contactors, circuit breakers, shunts, and busbars, used for controlling the on / off state of the high-voltage circuit of the battery clusters, current detection, and overcurrent protection. During charging and discharging, current flows through these high-voltage electrical components, generating heat in the components and their connections. Especially in high-protection, sealed high-voltage storage boxes, heat exchange between the box and the external environment is difficult, necessitating liquid cooling to remove the heat generated by the high-voltage electrical components.

[0003] As the cell capacity and charge / discharge rate of the energy storage system change, the current flowing through the high-voltage storage tank and the heat generated by the high-voltage storage tank will also change accordingly. For example, in energy storage systems with larger cell capacity or higher charge / discharge rates, the heat generated by the high-voltage electrical components is usually greater, requiring relatively strong liquid cooling regulation parameters; while in energy storage systems with smaller cell capacity or lower charge / discharge rates, using strong liquid cooling regulation parameters may increase the operating energy consumption of the liquid cooling unit.

[0004] Existing liquid cooling control systems for high-voltage energy storage boxes typically operate according to pre-set fixed parameters, or adjust the coolant flow rate based solely on the temperature at a single temperature acquisition location. On one hand, when these fixed parameters are applied to energy storage systems with different cell capacities and charge / discharge rates, they are difficult to match with the actual heating conditions of each system. On the other hand, due to differences in the heating characteristics and heat dissipation conditions of components such as fuses, contactors, shunts, busbars, and connectors, uneven temperature distribution may form within the high-voltage energy storage box. Adjusting the liquid cooling based solely on the temperature at a single location may not promptly reflect the temperature rise in localized areas within the high-voltage energy storage box.

[0005] Therefore, how to combine the pre-configured cell capacity specifications and charge / discharge rate of the energy storage system with the real-time temperature at different locations inside the energy storage high-voltage box, and rationally determine the liquid cooling adjustment parameters to dynamically dissipate heat from the energy storage high-voltage box, has become a technical problem that needs to be solved. Summary of the Invention

[0006] The purpose of this invention is to provide a temperature control method and device for an energy storage high-voltage box, which matches the coolant flow rate with the battery cell configuration, charging and discharging conditions and the real-time temperature inside the box. This can enhance heat dissipation when the temperature rises, reduce unnecessary cooling energy consumption at low temperatures, and reduce the impact of excessively high local temperatures on the operational reliability of high-voltage electrical components.

[0007] To address the aforementioned technical problems, this invention provides a temperature control method for an energy storage high-voltage box, applied to an energy storage system. The energy storage system includes an energy storage high-voltage box and a liquid-cooled branch corresponding to the energy storage high-voltage box. The method includes: The pre-configured cell capacity specifications and charge / discharge rates of the energy storage system are obtained, and a target operating condition parameter group is determined from multiple operating condition parameter groups based on the cell capacity specifications and the charge / discharge rates. Each operating condition parameter group includes a correspondence between multiple temperature strategy levels and multiple liquid cooling adjustment parameters. Multiple preset temperature ranges correspond to multiple temperature strategy levels, and the multiple temperature strategy levels are arranged from low to high according to their corresponding preset temperature ranges. As the temperature strategy level increases, the coolant flow rate corresponding to the liquid cooling adjustment parameter gradually increases, and the preset maximum flow rate is maintained after reaching the preset maximum flow rate. The temperature of multiple temperature acquisition points at different locations inside the energy storage high-voltage box is periodically acquired, and the highest temperature is determined based on the temperatures of the multiple temperature acquisition points. Based on the preset temperature range in which the highest temperature falls, determine the corresponding target temperature strategy level; Adjust the flow rate of coolant flowing through the energy storage high-pressure tank in the liquid cooling branch according to the liquid cooling adjustment parameters corresponding to the target temperature strategy level in the target operating condition parameter group.

[0008] Preferably, after determining the corresponding target temperature strategy level, the method further includes: When the target temperature strategy level is lower than the first preset strategy level, the energy storage system is controlled to operate according to the pre-configured charge and discharge rate; When the target temperature strategy level is not lower than the first preset strategy level but lower than the second preset strategy level, the energy storage converter is controlled to reduce the charge and discharge rate of the energy storage system. When the target temperature strategy level is not lower than the second preset strategy level but is lower than the third preset strategy level, the energy storage system is controlled to suspend charging and discharging. When the target temperature strategy level is not lower than the third preset strategy level, the energy storage system is controlled to shut down urgently. The first preset strategy level, the second preset strategy level, and the third preset strategy level are three of the multiple temperature strategy levels, and are arranged from low to high according to their corresponding preset temperature ranges.

[0009] Preferably, the energy storage high-voltage box is connected between the battery cluster and the energy storage converter. The energy storage high-voltage box includes a contactor and a circuit breaker, which are connected in series in the high-voltage circuit between the battery cluster and the energy storage converter. After determining the corresponding target temperature strategy level, it further includes: When the target temperature strategy level is not lower than the second preset strategy level but lower than the third preset strategy level, the contactor is controlled to disconnect to cut off the high-voltage circuit and output a high temperature alarm signal. When the target temperature strategy level is not lower than the third preset strategy level, the circuit breaker is controlled to trip to cut off the high-voltage circuit and output an emergency shutdown alarm signal.

[0010] Preferably, after adjusting the coolant flow rate through the energy storage high-pressure tank in the liquid cooling branch according to the liquid cooling adjustment parameter corresponding to the target temperature strategy level in the target operating condition parameter group, the method further includes: When the target temperature strategy level is higher than the lowest temperature strategy level and lower than the second preset strategy level, if the temperature of each temperature acquisition point is lower than the downgrade preset temperature corresponding to the target temperature strategy level, and the duration reaches the downgrade duration corresponding to the target temperature strategy level, then the temperature strategy level that is one level lower than the target temperature strategy level will be updated to the target temperature strategy level. When the target temperature strategy level is not lower than the second preset strategy level, if the temperature of each temperature acquisition point is lower than the downgrade preset temperature corresponding to the target temperature strategy level, the duration reaches the downgrade duration corresponding to the target temperature strategy level, and a manual downgrade instruction is received, then the temperature strategy level that is one level lower than the target temperature strategy level is updated to the target temperature strategy level. Return to the step of adjusting the flow rate of coolant flowing through the energy storage high-pressure tank in the liquid cooling branch according to the liquid cooling adjustment parameters corresponding to the target temperature strategy level in the target operating condition parameter group.

[0011] Preferably, the energy storage high-voltage box includes a liquid-cooled high-voltage integrated module, which includes a liquid-cooled plate, a first stacked busbar, a second stacked busbar, a fuse, a contactor, and a shunt; the energy storage high-voltage box also includes a positive copper busbar, a negative copper busbar, and an energy storage converter connector; The liquid cooling plate is disposed between the first stacked busbar and the second stacked busbar, with the first and second stacked busbars thermally bonded to their respective opposite surfaces. The first stacked busbar is electrically connected to the fuse, and the second stacked busbar is electrically connected to the contactor and the shunt, respectively. The positive and negative copper busbars are electrically connected to the positive and negative terminals of the energy storage converter connector, respectively. The plurality of temperature acquisition points include: A first temperature acquisition point is set at the connection position of the first stacked busbar near the fuse, and a second temperature acquisition point is set in the area of ​​the first stacked busbar away from the connection position of the fuse; A third temperature acquisition point is set at the connection position of the second stacked busbar near the contactor, and a fourth temperature acquisition point is set at the connection position of the second stacked busbar near the shunt. The fifth and sixth temperature acquisition points are respectively set at the positions of the positive copper busbar and the negative copper busbar near the connector of the energy storage converter; The seventh temperature acquisition point is set on the surface of the liquid cooling plate.

[0012] Preferably, after determining the corresponding target temperature strategy level, the method further includes: Determine whether the temperature at the first temperature acquisition point is the highest temperature; If the temperature at the first temperature acquisition point is not the highest temperature, and the target temperature strategy level is lower than the highest temperature strategy level, then the temperature strategy level, which is one level higher than the target temperature strategy level, is updated to the target temperature strategy level, and the process proceeds to the step of adjusting the flow rate of the coolant flowing through the energy storage high-pressure box in the liquid cooling branch according to the liquid cooling adjustment parameter corresponding to the target temperature strategy level in the target operating condition parameter group.

[0013] Preferably, after periodically acquiring the temperature of multiple temperature sampling points at different locations within the energy storage high-voltage box, the method further includes: Determine the first temperature difference between the first temperature acquisition point and the second temperature acquisition point; Determine the second temperature difference between the first temperature acquisition point and the seventh temperature acquisition point; If the first temperature difference is not within the first temperature conduction range, and / or the second temperature difference is not within the second temperature conduction range, a check and prompt will be made regarding the bonding status of the stacked busbar and the liquid cooling plate.

[0014] Preferably, after periodically acquiring the temperature of multiple temperature sampling points at different locations within the energy storage high-voltage box, the method further includes: Determine the absolute difference between the temperatures at the fifth temperature acquisition point and the sixth temperature acquisition point; If either the fifth temperature acquisition point or the sixth temperature acquisition point is higher than the preset connector warning temperature, an energy storage converter connector check warning will be issued. When the absolute difference is greater than the preset connector temperature difference, an alarm is triggered to indicate temperature asymmetry between the positive and negative terminals of the energy storage converter connector.

[0015] Preferably, after determining the corresponding target temperature strategy level, the method further includes: When the temperature at the seventh temperature acquisition point is higher than the preset liquid cooling plate temperature, if the target temperature strategy level is lower than the highest temperature strategy level, then the temperature strategy level that is one level higher than the target temperature strategy level will be updated to the target temperature strategy level. The step involves adjusting the flow rate of the coolant flowing through the energy storage high-pressure tank in the liquid cooling branch according to the liquid cooling adjustment parameters corresponding to the target temperature strategy level in the target operating condition parameter group.

[0016] Preferably, after determining the corresponding target temperature strategy level, the method further includes: For each temperature acquisition point, the rate of temperature change is determined based on the temperatures obtained at two adjacent sampling times. When the temperature change rate at any of the temperature acquisition points is greater than the preset change rate, if the target temperature strategy level is lower than the highest temperature strategy level, then the temperature strategy level that is one level higher than the target temperature strategy level will be updated to the target temperature strategy level. The step involves adjusting the flow rate of the coolant flowing through the energy storage high-pressure tank in the liquid cooling branch according to the liquid cooling adjustment parameters corresponding to the target temperature strategy level in the target operating condition parameter group.

[0017] Preferably, after determining the corresponding target temperature strategy level, the method further includes: When the temperature of the fifth temperature acquisition point or the sixth temperature acquisition point is greater than the preset connector alarm temperature, or the temperature of the first temperature acquisition point is greater than the preset fuse alarm temperature, the target temperature strategy level is raised to no less than the preset alarm strategy level. The step involves adjusting the flow rate of the coolant flowing through the energy storage high-pressure tank in the liquid cooling branch according to the liquid cooling adjustment parameters corresponding to the target temperature strategy level in the target operating condition parameter group.

[0018] Preferably, after adjusting the coolant flow rate through the energy storage high-pressure tank in the liquid cooling branch according to the liquid cooling adjustment parameter corresponding to the target temperature strategy level in the target operating condition parameter group, the method further includes: When the target temperature strategy level is lower than the highest temperature strategy level, and the temperature of any of the temperature acquisition points is detected to be higher than the upgrade preset temperature corresponding to the target temperature strategy level, the temperature strategy level that is one level higher than the target temperature strategy level is updated to the target temperature strategy level. Return to the step of adjusting the flow rate of coolant flowing through the energy storage high-pressure tank in the liquid cooling branch according to the liquid cooling adjustment parameters corresponding to the target temperature strategy level in the target operating condition parameter group.

[0019] To solve the above-mentioned technical problems, the present invention provides a temperature control device for an energy storage high-voltage box, comprising: Memory, used to store computer programs; A processor is used to implement the steps of the temperature control method for the energy storage high-voltage box as described above when executing a computer program.

[0020] This application provides a temperature control method and apparatus for an energy storage high-voltage box. Based on the pre-configured cell capacity specifications and charge / discharge rates of the energy storage system, a target operating condition parameter set is determined from multiple operating condition parameter sets. The temperature of multiple temperature acquisition points at different locations within the energy storage high-voltage box is periodically acquired to determine the highest temperature, and a target temperature strategy level is determined based on the preset temperature range of the highest temperature. The flow rate of the coolant flowing through the energy storage high-voltage box is adjusted according to the liquid cooling adjustment parameters corresponding to the target temperature strategy level in the target operating condition parameter set. As the temperature strategy level increases, the coolant flow rate gradually increases, remaining constant after reaching a preset maximum flow rate. This ensures that the coolant flow rate is matched to the cell configuration, charge / discharge conditions, and real-time temperature within the box, enhancing heat dissipation when the temperature rises, reducing unnecessary cooling energy consumption at low temperatures, and mitigating the impact of excessively high local temperatures on the operational reliability of high-voltage electrical components. Attached Figure Description

[0021] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic flowchart of a temperature control method for an energy storage high-voltage box provided in this application; Figure 2 A schematic diagram illustrating the specific process of a temperature control method for an energy storage high-voltage box provided in this application; Figure 3 This is a schematic diagram of the liquid-cooled high-pressure integrated module provided in this application; Figure 4A schematic diagram of the energy storage high-voltage box provided in this application; Figure 5 This is a schematic diagram of the temperature control device for an energy storage high-voltage box provided in this application. Detailed Implementation

[0023] The core of this invention is to provide a temperature control method and device for an energy storage high-voltage box, which matches the coolant flow rate with the battery cell configuration, charging and discharging conditions and the real-time temperature inside the box. This can enhance heat dissipation when the temperature rises, reduce unnecessary cooling energy consumption at low temperatures, and reduce the impact of excessively high local temperatures on the operational reliability of high-voltage electrical components.

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please refer to Figure 1 , Figure 1 The flowchart illustrates a temperature control method for an energy storage high-voltage box provided in this application. This method is applied to an energy storage system, which includes an energy storage high-voltage box and a liquid-cooled branch corresponding to the high-voltage box. The method includes: S11: Obtain the pre-configured cell capacity specifications and charge / discharge rate of the energy storage system, and determine the target operating condition parameter group from multiple operating condition parameter groups based on the cell capacity specifications and charge / discharge rate; wherein, each operating condition parameter group includes the correspondence between multiple temperature strategy levels and multiple liquid cooling regulation parameters, multiple preset temperature ranges correspond to multiple temperature strategy levels, and multiple temperature strategy levels are arranged from low to high according to the corresponding preset temperature ranges. As the temperature strategy level increases, the coolant flow rate corresponding to the liquid cooling regulation parameter gradually increases, and maintains the preset maximum flow rate after reaching the preset maximum flow rate; An energy storage system may include one or more battery clusters, an energy storage inverter, an energy storage high-voltage box, a battery management system, and a liquid cooling unit. The energy storage high-voltage box is connected between the battery clusters and the energy storage inverter, and is used to perform battery cluster voltage acquisition, battery cluster current acquisition, high-voltage circuit on / off control, and high-voltage circuit protection. During the charging and discharging process of the energy storage system, large currents flow through the high-voltage electrical components within the energy storage high-voltage box, thereby generating Joule heat.

[0026] The liquid cooling branch is a coolant flow path used to allow coolant to flow through the energy storage high-voltage tank and remove heat from within it. The liquid cooling branch can be connected in series with the battery pack liquid cooling circuit used to cool the battery pack. For example, the inlet of the liquid cooling branch can be connected to the outlet of the last battery pack, and the outlet of the liquid cooling branch can be connected to the return end of the liquid cooling unit, so that the coolant flowing out from the last battery pack flows through the energy storage high-voltage tank and returns to the liquid cooling unit. In another optional embodiment, the liquid cooling branch can be connected in parallel with the battery pack liquid cooling circuit. The inlet of the liquid cooling branch and the inlet of the battery pack liquid cooling circuit are respectively connected to the supply end of the liquid cooling unit, and the outlet of the liquid cooling branch and the outlet of the battery pack liquid cooling circuit are respectively connected to the return end of the liquid cooling unit. Whether the energy storage high-voltage tank is connected in series or in parallel, it does not affect the adjustment of the coolant flow rate through the energy storage high-voltage tank according to the liquid cooling adjustment parameters in this embodiment.

[0027] The pre-configured cell capacity specifications and charge / discharge rates of an energy storage system are system parameters configured before the system is put into operation, based on the model of the installed cells and the rated operating requirements of the energy storage system. Cell capacity specifications can be, for example, 280Ah, 314Ah, 587Ah, 588Ah, or 1190Ah, and charge / discharge rates can be, for example, 0.25C, 0.5C, or 1C. The above values ​​are for illustrative purposes only, and the cell capacity specifications and charge / discharge rates are not limited to these values. As the cell products and the operating requirements of the energy storage system change, other cell capacity specifications and other charge / discharge rates can be set.

[0028] In one optional implementation, the main control board within the energy storage high-voltage box reads the cell capacity specifications and charge / discharge rates from the battery management system during initialization. The main control board may include a microcontroller, which communicates with the battery management system via a controller area network (CLAN) bus, serial communication bus, or other communication interfaces. The battery management system sends the pre-configured cell capacity specifications and charge / discharge rates of the energy storage system to the main control board. The main control board queries a preset operating condition parameter matrix based on the configuration combination formed by these two parameters to determine the target operating condition parameter set. The processor in this application can be the main control board, which can be a separate control board or integrated into the battery management system; this application does not limit this.

[0029] Cell capacity specifications and charge / discharge rates are system configuration parameters, not real-time measurement parameters that change during energy storage system operation. The target operating condition parameter set, determined during energy storage system initialization, can remain unchanged during the current operation. Even if the actual charge / discharge rate of the energy storage system is subsequently reduced due to temperature increases, it is not necessary to reselect the target operating condition parameter set based on the reduced actual charge / discharge rate. The target operating condition parameter set only needs to be redefined after the cell capacity specifications or pre-configured charge / discharge rate of the energy storage system are reconfigured.

[0030] The product of the cell capacity specification and the charge / discharge rate can be used to estimate the rated current of the energy storage system. For example, the rated current of a 280Ah cell at 0.25C, 0.5C, and 1C is approximately 70A, 140A, and 280A, respectively; the rated current of a 314Ah cell at 0.25C, 0.5C, and 1C is approximately 78.5A, 157A, and 314A, respectively; and the rated current of a 587Ah cell at 0.25C, 0.5C, and 1C is approximately 146.75A, 293.5A, and 587A, respectively. The peak current of the energy storage system can be approximately 2.5 times the rated current, with the specific peak current determined by the cell's allowable peak rate and peak duration.

[0031] Please refer to Table 1, which is a table of rated currents: Table 1

[0032] The peak current can be approximately 2.5 times the rated current, and the specific value can be determined based on the allowable peak current ratio and peak duration of the battery cell. The rated current and peak current mentioned above are used for pre-calibration of the thermal load and operating parameter set of the energy storage high-voltage box, and do not indicate that the target operating parameter set will be reselected based on the real-time current during the temperature control process.

[0033] The heat generated inside the high-voltage energy storage box mainly comes from the Joule heat generated when current flows through the high-voltage electrical components and their connections. For any high-voltage electrical component, the corresponding heat power can be estimated based on the current and resistance, and the heat power can be expressed as: ; Where P represents thermal power, I represents the current flowing through the high-voltage electrical component, and R represents the equivalent resistance of the high-voltage electrical component or connection location.

[0034] As an example, the contact resistance at the electrical connection point can be approximately 0.03 mΩ, the equivalent resistance of contactor 42 can be approximately 0.5 mΩ, the equivalent resistance of shunt 44 can be approximately 0.25 mΩ, the equivalent resistance of fuse 22 can be approximately 1.2 mΩ, and the equivalent resistance of copper busbar can be approximately 0.15 mΩ. Based on the above example parameters, the total heat load of the energy storage high-voltage box can be estimated at approximately 6W~12W, 24W~48W, and 93W~183W under the operating conditions of 280Ah×0.25C, 280Ah×0.5C, and 280Ah×1C, respectively; the total heat load of the energy storage high-voltage box can be estimated at approximately 8W~15W, 30W~60W, and 119W~231W under the operating conditions of 314Ah×0.25C, 314Ah×0.5C, and 314Ah×1C, respectively; and the total heat load of the energy storage high-voltage box can be estimated at approximately 26W~53W, 104W~209W, and 416W~836W under the operating conditions of 587Ah×0.25C, 587Ah×0.5C, and 587Ah×1C, respectively.

[0035] Please refer to Table 2, which is the heat load table for the high-pressure box: Table 2

[0036] The aforementioned resistance and total thermal load are used to illustrate the calibration basis of the operating condition parameter set, and do not constitute the judgment parameters that must be used during operation. Different manufacturers or different models of fuses 22, contactors 42, shunts 44 and other high-voltage electrical components may have different equivalent resistances. Therefore, in actual operation, the energy storage high-voltage box can determine the target operating condition parameter set according to the pre-configured cell capacity specifications and charge / discharge rate of the energy storage system, and determine the target temperature strategy level according to the actual collected temperature.

[0037] Multiple operating parameter groups can correspond to different heat load ranges. For example, operating parameter group A, operating parameter group B, and operating parameter group C can be set. Operating parameter group A can be used as a low heat load operating parameter group, corresponding to the configuration combination of 280Ah or 314Ah cells with a 0.25C charge / discharge rate; operating parameter group B can be used as a medium heat load operating parameter group, corresponding to the configuration combination of 280Ah cells with a 0.5C or 1C charge / discharge rate, 314Ah cells with a 0.5C charge / discharge rate, and 587Ah cells with a 0.25C charge / discharge rate; operating parameter group C can be used as a high heat load operating parameter group, corresponding to the configuration combination of 314Ah cells with a 1C charge / discharge rate and 587Ah cells with a 0.5C or 1C charge / discharge rate.

[0038] It should be noted that the number of operating parameter groups is not limited to three. Two, four, or more operating parameter groups can be set according to the cell capacity specifications, charge / discharge rates, high-voltage tank structure, and flow range of the liquid cooling unit supported by the energy storage system. For example, when the energy storage system uses 1190Ah cells, operating parameter groups can be set separately according to the corresponding thermal load of the 1190Ah cells at different charge / discharge rates.

[0039] Liquid cooling regulation parameters are control parameters used to determine the flow rate of coolant through the high-pressure energy storage tank. These parameters can directly include the target coolant flow rate, or they can include the power of the circulating pump in the liquid-cooled unit, the circulating pump speed, the opening of the flow control valve in the liquid-cooled branch, or a combination of these parameters. Increasing the circulating pump power correspondingly increases the total coolant flow rate that the liquid-cooled unit can provide; increasing the flow control valve opening correspondingly increases the coolant flow rate into the liquid-cooled branch corresponding to the high-pressure energy storage tank. Therefore, both the circulating pump power and the flow control valve opening can be used as execution parameters to achieve the target coolant flow rate.

[0040] In one exemplary embodiment, the multiple temperature strategy levels include Level 0, Level 1, Level 2, Level 3, and Level 4, arranged from low to high. In operating parameter group A, the coolant flow rate corresponding to Level 0 can be 0, the coolant flow rate corresponding to Level 1 can be 0.3L / min to 0.6L / min, the coolant flow rate corresponding to Level 2 can be 0.8L / min to 1.5L / min, the coolant flow rate corresponding to Level 3 can be 2.0L / min to 4.0L / min, and the coolant flow rate corresponding to Level 4 can be the preset maximum flow rate.

[0041] In operating condition parameter group B, the coolant flow rate corresponding to Level 0 can be 0, the coolant flow rate corresponding to Level 1 can be 0.8L / min to 1.5L / min, the coolant flow rate corresponding to Level 2 can be 2.0L / min to 4.0L / min, and the coolant flow rate corresponding to Level 3 and Level 4 can both be the preset maximum flow rate.

[0042] In operating condition parameter group C, the coolant flow rate corresponding to Level 0 can be 0.5L / min~1.0L / min, the coolant flow rate corresponding to Level 1 can be 2.0L / min~4.0L / min, and the coolant flow rates corresponding to Level 2, Level 3 and Level 4 can all be the preset maximum flow rate.

[0043] The preset maximum flow rate can be determined based on the maximum liquid supply capacity of the liquid chiller unit, the flow resistance of the liquid cooling branch, the flow control valve's flow capacity, and the allowable pressure of the liquid cooling plate 30. For example, the preset maximum flow rate can be 4.4 L / min, or other flow rates can be selected based on the actual heat dissipation requirements of the energy storage high-pressure box, provided that the liquid chiller unit can provide a coolant flow rate of 0.5 L / min to 10 L / min.

[0044] The above correspondence indicates that for the same target operating condition parameter set, as the temperature strategy level increases, the corresponding coolant flow rate gradually increases; when the corresponding coolant flow rate has reached the preset maximum flow rate, higher temperature strategy levels continue to use the preset maximum flow rate and no longer require the coolant flow rate to continue increasing. Therefore, Level 3 and Level 4 can correspond to the same preset maximum flow rate, but they can still correspond to different charging / discharging control methods or safety protection methods.

[0045] The liquid cooling adjustment parameters corresponding to the same temperature strategy level in different operating parameter groups can be different. For example, Level 1 of operating parameter group A can correspond to 0.3L / min~0.6L / min, Level 1 of operating parameter group B can correspond to 0.8L / min~1.5L / min, and Level 1 of operating parameter group C can correspond to 2.0L / min~4.0L / min. Level 0 of operating parameter groups A and B can both correspond to a coolant flow rate of 0, and Level 4 of multiple operating parameter groups can also all correspond to the preset maximum flow rate. Therefore, it is not required that the liquid cooling adjustment parameters corresponding to each same temperature strategy level in different operating parameter groups be different.

[0046] Please refer to Table 3, which is a table of liquid cooling adjustment parameters: Table 3

[0047] The circulating pump power and the flow control valve opening are the execution parameters used to determine the corresponding coolant flow rate. Increasing the circulating pump power increases the total coolant flow rate that the liquid-cooled unit can provide, while increasing the flow control valve opening increases the coolant flow rate entering the corresponding liquid-cooled branch of the energy storage high-pressure tank. Specifically, the flow control valve can be a solenoid valve K.

[0048] In Level 0 of both operating parameter groups A and B, the liquid-cooled unit can maintain low-power operation due to the operation of the battery pack's liquid-cooling circuit, but the flow control valve corresponding to the energy storage high-voltage tank is closed, so the coolant flow rate through the energy storage high-voltage tank is 0. This state does not contradict whether the liquid-cooled unit as a whole is shut down.

[0049] Operating condition parameter group A is suitable for low heat load configurations formed by 280Ah or 314Ah cells and a 0.25C charge / discharge rate. The total heat load of the energy storage high-voltage box is usually no more than 15W. When the coolant flow rate is 0.3~0.6L / min, the heat dissipation capacity of the liquid cooling plate 30 can meet the heat dissipation requirements of this type of operating condition. Therefore, in Level 0, the corresponding liquid cooling branch of the energy storage high-voltage box can be shut down to achieve energy saving. In Level 1, a lower circulating pump power and flow regulating valve opening are used.

[0050] Operating parameter group B is suitable for medium heat load configurations consisting of 280Ah cells with a 0.5C or 1C charge / discharge rate, 314Ah cells with a 0.5C charge / discharge rate, and 587Ah cells with a 0.25C charge / discharge rate. The total heat load of the energy storage high-voltage box can be approximately 24~183W. For configurations with higher heat loads, a circulating pump power of 200~350W, a coolant flow rate of 2.0~4.0L / min, and a fully open flow control valve can be used at Level 2.

[0051] Operating parameter group C is suitable for high heat load configurations consisting of 314Ah cells with a 1C charge / discharge rate and 587Ah cells with a 0.5C or 1C charge / discharge rate. The total heat load of the energy storage high-voltage box can be approximately 119~836W. Therefore, even at Level 0, a basic coolant flow rate of 0.5~1.0L / min can be maintained. When the temperature strategy level reaches Level 2, a preset maximum flow rate can be used, combined with a reduced charge / discharge rate, to simultaneously enhance heat dissipation capacity and reduce the rate of heat generation.

[0052] S12: Periodically acquire the temperature of multiple temperature sampling points at different locations inside the energy storage high-voltage box, and determine the highest temperature based on the temperature of multiple temperature sampling points; Multiple temperature acquisition points are set at different heating, heat conduction, or cooling locations within the energy storage high-voltage box to reflect the temperature in different areas within the box. The number of temperature acquisition points can be determined as needed, as long as at least two different locations can be sampled. Temperature acquisition points can be implemented using thermistors, thermocouples, digital temperature sensors, or other sensors capable of outputting temperature signals.

[0053] The processor reads the temperature from multiple temperature acquisition points according to a preset sampling period. The preset sampling period can be determined based on the thermal inertia of the high-voltage electrical components, the response speed of the temperature sensor, and the data processing capability of the controller. The preset sampling period can be 1 minute. In another embodiment, the preset sampling period can also be 1 second or other durations. The shorter the preset sampling period, the faster the processor responds to temperature changes, but the corresponding data processing and communication volume will also increase accordingly.

[0054] Suppose that the temperatures of n temperature sampling points are obtained at the k-th sampling time, namely the temperature T1(k) of the first temperature sampling point obtained at the k-th sampling time, the temperature T2(k) of the second temperature sampling point obtained at the k-th sampling time, ..., the temperature Tn(k) of the n-th temperature sampling point obtained at the k-th sampling time. n If (k), then the maximum temperature T_max(k) can be expressed as: T_max(k)=max{T1(k), T2(k),...,T n (k)}.

[0055] The processor can re-determine the highest temperature in each sampling cycle. The highest temperature corresponds to the monitored location with the highest temperature inside the energy storage high-voltage box at the current sampling time, so that the subsequent temperature strategy level can be determined according to the location with the highest temperature risk, rather than according to the average temperature of all temperature sampling points.

[0056] S13: Determine the corresponding target temperature strategy level based on the preset temperature range in which the highest temperature is located; Multiple preset temperature ranges can be formed by dividing the system into multiple temperature thresholds, with each preset temperature range corresponding to a temperature strategy level. The temperature thresholds can be predetermined based on the allowable operating temperatures of fuse 22, contactor 42, shunt 44, busbars, connectors, and other monitored components, temperature rise test results, the heat dissipation capacity of the liquid cooling unit, and the safety protection requirements of the energy storage system. Different projects can use different temperature thresholds; the same values ​​are not required for all projects.

[0057] As an example, the preset temperature range corresponding to Level 0 can be a maximum temperature less than or equal to 40℃; the preset temperature range corresponding to Level 1 can be a maximum temperature greater than 40℃ and less than or equal to 55℃; the preset temperature range corresponding to Level 2 can be a maximum temperature greater than 55℃ and less than or equal to 65℃; the preset temperature range corresponding to Level 3 can be a maximum temperature greater than 65℃ and less than or equal to 85℃; and the preset temperature range corresponding to Level 4 can be a maximum temperature greater than 85℃.

[0058] For example, when the temperatures at multiple temperature acquisition points are 48℃, 45℃, 42℃, and 40℃ respectively, the processor determines the highest temperature to be 48℃ and sets Level 1, corresponding to the preset temperature range of 40℃ to 55℃, as the target temperature policy level. As another example, when the highest temperature is 60℃, Level 2 is determined as the target temperature policy level.

[0059] This step determines the basic target temperature strategy level based on the highest temperature. The temperature difference between different temperature sampling points, the rate of temperature change, and the abnormal temperature at a specific temperature sampling point can be used to perform further judgments after the basic target temperature strategy level is determined, but it is not used to change the basic correspondence between the multiple preset temperature ranges and multiple temperature strategy levels in this step.

[0060] S14: Adjust the flow rate of coolant flowing through the energy storage high-pressure box in the liquid cooling branch according to the liquid cooling adjustment parameter corresponding to the target temperature strategy level in the target operating condition parameter group.

[0061] After determining the target operating condition parameter group and the target temperature strategy level, the liquid cooling regulation parameters corresponding to the target temperature strategy level are queried from the target operating condition parameter group, and control commands are sent to the liquid cooling unit and / or the flow regulating valves installed in the liquid cooling branch.

[0062] For example, when the liquid cooling regulation parameters include the circulating pump power, the processor can send the circulating pump power setpoint to the liquid cooling unit, which then adjusts the input power or speed of the circulating pump. When the liquid cooling regulation parameters include the flow control valve opening, the processor can send the opening setpoint to the flow control valve actuator, which then adjusts the flow control valve opening. The circulating pump power and the flow control valve opening can be adjusted individually or in combination to ensure that the actual coolant flow rate through the high-pressure energy storage tank is close to the target coolant flow rate.

[0063] After adjusting the flow control valve opening, the actual coolant flow rate measured by the flow sensor can be set as the closed-loop feedback quantity. Alternatively, the temperature of multiple temperature sampling points can be acquired in subsequent sampling cycles, and the result of the coolant flow rate adjustment can be judged by whether the temperature drops and whether the temperature strategy level changes. In another optional implementation, a flow sensor can be installed in the liquid cooling branch to correct the circulating pump power or the flow control valve opening based on the actual coolant flow rate.

[0064] Multiple fixed flow channel zones can be set inside the liquid cooling plate 30. The width and flow resistance of each flow channel zone can be determined during the manufacturing of the liquid cooling plate 30 and remain unchanged during the operation of the energy storage system. Coolant can enter multiple flow channel zones from the inlet and converge to the return port after flowing through the corresponding area. Wider flow channel zones have lower flow resistance and higher coolant flow rate, while narrower flow channel zones have higher flow resistance and lower coolant flow rate, thus pre-distributing coolant according to the heat dissipation requirements of each area. The processor adjusts the power of the circulating pump or the opening of the flow regulating valve to change the total flow rate of coolant entering the liquid cooling plate 30, rather than changing the width of each flow channel zone during operation.

[0065] In one embodiment, the liquid cooling plate 30 may include a strong cooling zone, a medium cooling zone, and a weak cooling zone. The strong cooling zone may correspond to components with high heat power, such as the fuse 22; the medium cooling zone may correspond to the contactor 42; and the weak cooling zone may correspond to the distributor 44 or other components with low heat power. Multiple flow channel zones can be arranged in parallel or sequentially along the coolant flow direction, depending on the specific structure of the liquid cooling plate 30. The specific flow channel structure of the liquid cooling plate 30 does not affect the adjustment of the total coolant flow rate according to the target operating condition parameter group and the target temperature strategy level in this embodiment.

[0066] After the processor completes the current coolant flow adjustment, it returns to step S12 in the next sampling cycle to reacquire the temperatures of multiple temperature acquisition points, and executes steps S13 and S14 in sequence, thereby forming a control process that is executed cyclically according to the temperature change inside the energy storage high-voltage box.

[0067] This embodiment first uses the pre-configured cell capacity specifications and charge / discharge rates of the energy storage system to determine the target operating condition parameter set suitable for the current energy storage system configuration. Then, it uses the highest temperature among multiple locations within the high-voltage storage tank to determine the target temperature strategy level, and uses both to determine the coolant flow rate. Therefore, at the same temperature, different coolant flow rates can be used depending on the energy storage system configuration. Furthermore, under the same system configuration, the coolant flow rate can be gradually increased as the temperature rises, thereby reducing cooling energy consumption under heat load conditions while meeting heat dissipation requirements under high heat load conditions.

[0068] Based on the above embodiments: Please refer to Figure 2 , Figure 2 A schematic diagram illustrating the specific process of a temperature control method for an energy storage high-voltage box provided in this application.

[0069] As a preferred embodiment, after determining the corresponding target temperature strategy level, the method further includes: When the target temperature strategy level is lower than the first preset strategy level, the energy storage system is controlled to operate according to the pre-configured charge and discharge rate. When the target temperature strategy level is not lower than the first preset strategy level but lower than the second preset strategy level, control the energy storage converter to reduce the charge and discharge rate of the energy storage system. When the target temperature strategy level is not lower than the second preset strategy level but lower than the third preset strategy level, the energy storage system is controlled to suspend charging and discharging. When the target temperature strategy level is not lower than the third preset strategy level, the energy storage system is controlled to shut down urgently. Among them, the first preset strategy level, the second preset strategy level, and the third preset strategy level are three of the multiple temperature strategy levels, and are arranged from low to high according to their corresponding preset temperature ranges.

[0070] In this embodiment, the first preset strategy level, the second preset strategy level, and the third preset strategy level are three of a plurality of temperature strategy levels, arranged from low to high according to their corresponding preset temperature ranges. In the example including Level 0 to Level 4, the first preset strategy level can be Level 2, the second preset strategy level can be Level 3, and the third preset strategy level can be Level 4.

[0071] When the target temperature strategy level is lower than the first preset strategy level, the energy storage system is controlled to operate according to the pre-configured charge / discharge rate. In the examples of the five temperature strategy levels mentioned above, Level 0 and Level 1 are both lower than Level 2. Therefore, when a charging or discharging command is issued, the energy storage system can operate at the pre-configured charge / discharge rate of 0.25C, 0.5C, or 1C. This step does not imply forced initiation of charging or discharging when the energy storage system is in a quiescent state. When the energy storage system is in a quiescent state, it can remain in a quiescent state.

[0072] The energy storage system can operate in a cycle of charging, resting, discharging, and resting. During the resting period, the battery clusters have no charging or discharging current or a very small charging or discharging current, and the Joule heat generated by the high-voltage electrical components in the energy storage high-voltage box is reduced accordingly. For low heat load conditions, the liquid cooling unit or liquid cooling branch can be shut down during the resting period; for cases where residual heat still exists or high heat load parameters are used, a small coolant flow rate can also be maintained.

[0073] When the target temperature strategy level is not lower than the first preset strategy level but lower than the second preset strategy level, the processor controls the energy storage converter to reduce the charge / discharge rate of the energy storage system. For example, if the first preset strategy level is Level 2 and the second preset strategy level is Level 3, the currently allowed charge / discharge rate can be reduced by one level when the target temperature strategy level is Level 2. When the pre-configured charge / discharge rate is 1C, the allowed charge / discharge rate can be reduced to 0.5C; when the pre-configured charge / discharge rate is 0.5C, the allowed charge / discharge rate can be reduced to 0.25C.

[0074] The request to reduce the charge / discharge rate can be sent to the battery management system (BMS) first. The BMS then sends the allowable charge / discharge power or allowable charge / discharge current to the energy storage inverter. The inverter reduces the actual charge / discharge rate based on the received allowable power or current. After reducing the charge / discharge rate, the current flowing through the high-voltage storage tank decreases, and the Joule heating of the high-voltage electrical components decreases with the square of the current, thereby increasing the coolant flow rate while reducing heat input.

[0075] The reduced actual charge / discharge rate is a temporary operating parameter during the temperature protection process and does not change the pre-configured charge / discharge rate of the energy storage system. Therefore, the target operating condition parameter set is not reselected based on the reduced actual charge / discharge rate; liquid cooling regulation is still performed according to the target operating condition parameter set determined during initialization.

[0076] When the target temperature strategy level is not lower than the second preset strategy level but lower than the third preset strategy level, the processor controls the energy storage system to suspend charging and discharging. For example, when the second preset strategy level is Level 3 and the third preset strategy level is Level 4, under the condition that the target temperature strategy level is Level 3, the allowable charging and discharging power of the energy storage system is set to zero, or a command to suspend charging and discharging is sent to the energy storage converter. After the energy storage system suspends charging and discharging, the operating current in the high-voltage circuit drops to zero or close to zero, causing the high-voltage electrical components to stop generating Joule heat corresponding to the charging and discharging current. At the same time, the liquid cooling branch can continue to deliver coolant to remove the residual heat in the high-voltage tank of the energy storage system.

[0077] When the target temperature strategy level is not lower than the third preset strategy level, the energy storage system is controlled to shut down urgently. For example, when the target temperature strategy level is Level 4, an emergency shutdown command can be sent to the battery management system, energy storage inverter, and energy management system to stop the energy storage system from charging and discharging, and to prevent automatic resumption of operation without completing safety checks.

[0078] The specific values ​​of the first, second, and third preset strategy levels are not limited to Level 2, Level 3, and Level 4, and can be set according to the allowable operating temperature and safety protection requirements of the energy storage system. However, the three preset strategy levels should be arranged from low to high according to their corresponding preset temperature ranges, so that the charge and discharge control sequentially goes through normal charge and discharge, limiting the charge and discharge rate, suspending charge and discharge, and emergency shutdown as the temperature rises.

[0079] In a preferred embodiment, the energy storage high-voltage box is connected between the battery cluster and the energy storage converter. The energy storage high-voltage box includes a contactor 42 and a circuit breaker, which are connected in series in the high-voltage circuit between the battery cluster and the energy storage converter. After determining the corresponding target temperature strategy level, it also includes: When the target temperature strategy level is not lower than the second preset strategy level but lower than the third preset strategy level, the control contactor 42 is disconnected to cut off the high voltage circuit and output a high temperature alarm signal. When the target temperature strategy level is not lower than the third preset strategy level, the circuit breaker is controlled to trip to cut off the high-voltage circuit and output an emergency shutdown alarm signal.

[0080] In this embodiment, the high-voltage circuit may include a positive circuit and a negative circuit. The circuit breaker can control the opening and closing of the positive and negative circuits separately, and the contactor 42 can be installed in the positive circuit, the negative circuit, or both. The contactor 42 and the circuit breaker form different levels of on / off protection in the high-voltage circuit.

[0081] Contactor 42 includes contacts that can be engaged or disengaged according to an electrical control signal. Contactor 42 can be engaged when a processor or battery management system sends a closing control signal to the control coil of contactor 42; contactor 42 can be disengaged when a disengagement control signal is sent to contactor 42 or when power supply to the control coil is stopped. After contactor 42 is disengaged, it can be re-engaged according to a control signal if the reset conditions are met.

[0082] The circuit breaker may include an electrically controlled tripping mechanism. When the processor or battery management system sends a tripping signal to the circuit breaker, the circuit breaker performs the tripping action and disconnects the high-voltage circuit. After the circuit breaker trips, maintenance personnel can manually reclose it after completing a safety check. Therefore, the protection level corresponding to the circuit breaker is higher than that corresponding to contactor 42.

[0083] When the target temperature strategy level is not lower than the second preset strategy level but lower than the third preset strategy level, the processor controls contactor 42 to disconnect, thereby cutting off the high-voltage circuit and outputting a high-temperature alarm signal. Taking the second preset strategy level as Level 3 and the third preset strategy level as Level 4 as an example, when the maximum temperature is greater than 65℃ and less than or equal to 85℃, the processor can control contactor 42 to disconnect via the battery management system, thereby disconnecting the high-voltage circuit between the corresponding battery cluster and the energy storage converter, and outputting a high-temperature alarm signal to the battery management system and the energy management system.

[0084] After contactor 42 is disconnected, the energy storage system suspends charging and discharging, but the liquid cooling unit can continue to operate according to the liquid cooling regulation parameters corresponding to Level 3 in the target operating condition parameter group to remove residual heat from the energy storage high-voltage box. The high-temperature alarm signal can include the current target temperature strategy level, the highest temperature, the temperature acquisition point corresponding to the highest temperature, and the alarm time, which is used to prompt maintenance personnel to check the energy storage high-voltage box.

[0085] When the target temperature strategy level is not lower than the third preset strategy level, the processor controls the circuit breaker to trip, thereby cutting off the high-voltage circuit and outputting an emergency shutdown alarm signal. Taking the third preset strategy level as Level 4 as an example, when the maximum temperature exceeds 85℃, a trip signal is sent to the circuit breaker's electronically controlled tripping mechanism, cutting off the high-voltage circuit between the battery pack and the energy storage converter. Simultaneously, emergency shutdown alarm signals can be output to the battery management system, energy storage converter, and energy management system, and alarms can also be output through on-site audible and visual alarm devices.

[0086] When the target temperature strategy level is Level 4, contactor 42 can also disconnect simultaneously, but the final protection to cut off the high-voltage circuit is achieved by the circuit breaker tripping. The liquid-cooled unit can continue to operate at full power, with the flow control valve remaining fully open to continue reducing the temperature of the high-voltage electrical components in the energy storage high-voltage box after the high-voltage circuit is disconnected.

[0087] When the maximum temperature is less than or equal to 40℃, the target temperature strategy level is set to Level 0. For operating parameter groups A and B, the flow control valve corresponding to the high-pressure energy storage tank can be closed, reducing the coolant flow rate through the high-pressure energy storage tank to 0. For operating parameter group C, the circulating pump can be controlled to operate at 80~120W, and the flow control valve opening can be controlled at 40~60%, resulting in a coolant flow rate of 0.5~1.0L / min. The energy storage system operates according to the pre-configured charge / discharge rate when a charge / discharge command is present, and remains in a static state when idle.

[0088] It should also be noted that when the maximum temperature is greater than 40℃ and less than or equal to 55℃, the target temperature strategy level is determined to be Level 1. Based on the target operating condition parameter set, the corresponding circulating pump power, coolant flow rate, and flow control valve opening are read to control the normal heat dissipation of the energy storage high-pressure tank. The energy storage system continues to operate according to the pre-configured charge / discharge rate, and contactor 42 remains closed. No alarm signal needs to be output unless an anomaly is detected at a specific temperature sampling point.

[0089] When the maximum temperature is greater than 55℃ and less than or equal to 65℃, the target temperature strategy level is determined to be Level 2. Based on the target operating condition parameter set, the coolant flow rate is increased, and the main control board sends a rate limit request to the battery management system (BMS). The BMS then forwards the rate limit request to the energy storage inverter, causing the inverter to reduce the allowable charge / discharge rate by one level. For example, it can reduce 1C to 0.5C, or 0.5C to 0.25C. The reduced actual charge / discharge rate is not used to reselect the target operating condition parameter set.

[0090] When the maximum temperature is greater than 65℃ but less than or equal to 85℃, the target temperature strategy level is determined to be Level 3. The energy storage system is controlled to suspend charging and discharging, contactor 42 is opened to disconnect the high-voltage circuit, and a high-temperature alarm signal is output. Simultaneously, the liquid-cooled branch continues to operate according to the liquid-cooling regulation parameters corresponding to Level 3 of the target operating condition parameter group to remove residual heat from the high-voltage electrical components. Contactor 42 can reclose after the temperature meets the degradation conditions and a corresponding control signal is received.

[0091] When the maximum temperature exceeds 85℃, the target temperature strategy level is set to Level 4. The energy storage system is shut down urgently, contactor 42 is disconnected, and the circuit breaker trips to cut off the high-voltage circuit. Simultaneously, the flow regulating valve is fully opened, and the liquid-cooled unit continues to operate at a power of no less than 350W to maintain the coolant flow at the preset maximum flow rate. After the circuit breaker trips, it must be manually reclosed only after meeting the safety recovery conditions.

[0092] The aforementioned control method, when the temperature strategy level increases, not only increases the coolant flow rate through the high-voltage energy storage tank, but also gradually implements measures such as reducing the charge / discharge rate, suspending charge / discharge, and emergency shutdown. This simultaneously suppresses further temperature increases within the high-voltage energy storage tank by enhancing heat dissipation and reducing heat generation. After suspending charge / discharge or performing an emergency shutdown, the liquid-cooled branch continues to operate to eliminate residual heat from the high-voltage electrical components.

[0093] As a preferred embodiment, after adjusting the coolant flow rate through the energy storage high-pressure tank in the liquid cooling branch according to the liquid cooling adjustment parameters corresponding to the target temperature strategy level in the target operating condition parameter group, the method further includes: When the target temperature strategy level is higher than the lowest temperature strategy level and lower than the second preset strategy level, if the temperature of each temperature acquisition point is lower than the preset temperature for downgrading corresponding to the target temperature strategy level, and the duration reaches the downgrading duration corresponding to the target temperature strategy level, then the temperature strategy level that is one level lower than the target temperature strategy level will be updated to the target temperature strategy level. When the target temperature strategy level is not lower than the second preset strategy level, if the temperature of each temperature acquisition point is lower than the preset temperature for downgrading corresponding to the target temperature strategy level, the duration reaches the downgrading duration corresponding to the target temperature strategy level, and a manual downgrading instruction is received, then the temperature strategy level that is one level lower than the target temperature strategy level will be updated to the target temperature strategy level. Return to the steps of adjusting the coolant flow rate through the energy storage high-pressure tank in the liquid cooling branch according to the liquid cooling adjustment parameters corresponding to the target temperature strategy level in the target operating condition parameter group.

[0094] In this embodiment, when the target temperature policy level is higher than the lowest temperature policy level but lower than the second preset policy level, the processor determines whether the temperature at each temperature sampling point is lower than the downgrade preset temperature corresponding to the target temperature policy level, and counts the duration of this state. When the temperature at each temperature sampling point is lower than the downgrade preset temperature, and the duration reaches the corresponding downgrade duration, the processor updates the temperature policy level, which is one level lower than the current target temperature policy level, to the target temperature policy level. It should be noted that the lowest temperature policy level can be lower than the first preset policy level, and the target temperature policy level, after downgrading, must not be lower than the lowest temperature policy level.

[0095] The downgraded preset temperature can be lower than the upgrade temperature threshold between two adjacent temperature strategy levels, thus creating a temperature hysteresis. For example, each of the aforementioned operating condition parameter groups includes five temperature strategy levels: Level 0, Level 1, Level 2, Level 3, and Level 4. The lowest temperature strategy level is Level 0, the first preset strategy level is Level 2, the second preset strategy level is Level 3, and the third preset strategy level is Level 4. When the upgrade temperature threshold between Level 0 and Level 1 is 40℃, the downgraded preset temperature corresponding to Level 1 can be 35℃; when the upgrade temperature threshold between Level 1 and Level 2 is 55℃, the downgraded preset temperature corresponding to Level 2 can be 45℃. The target temperature strategy level, after downgrading, will not be lower than Level 0. By setting different upgrade temperature thresholds and downgraded preset temperatures, frequent increases and decreases in the target temperature strategy level can be avoided when the highest temperature fluctuates around the same temperature threshold.

[0096] In one example, when the target temperature policy level is Level 1, if the temperature at each temperature sampling point is less than or equal to 35°C and continues for 30 seconds, then Level 0 is updated to the target temperature policy level; when the target temperature policy level is Level 2, if the temperature at each temperature sampling point is less than or equal to 45°C and continues for 60 seconds, then Level 1 is updated to the target temperature policy level.

[0097] The degradation condition requires that the temperature at all temperature sampling points be lower than the preset degradation temperature, rather than only requiring that the temperature sampling point corresponding to the original highest temperature be lower than the preset degradation temperature. Therefore, if there are other high-temperature locations inside the energy storage high-pressure box, the coolant flow rate will not be reduced prematurely just because the location corresponding to the original highest temperature has cooled down first.

[0098] When the target temperature strategy level is not lower than the second preset strategy level, in addition to requiring that the temperature at each temperature acquisition point is lower than the preset downgrade temperature corresponding to the target temperature strategy level and remain below it for the corresponding downgrade duration, a manual downgrade command must also be received. The manual downgrade command can be input by maintenance personnel through the energy management system, the host computer, or the local operation interface of the energy storage high-voltage box.

[0099] For example, when the target temperature strategy level is Level 3, if the temperature at each temperature sampling point is less than or equal to 50°C for 120 seconds, and the maintenance personnel confirm that the energy storage high-voltage box can resume operation, then Level 2 will be updated to the target temperature strategy level. When the target temperature strategy level is Level 4, if the temperature at each temperature sampling point is less than or equal to 50°C for 300 seconds, and the maintenance personnel confirm that the anomaly causing the emergency shutdown has been resolved, then Level 3 will be updated to the target temperature strategy level.

[0100] The manual degradation command is used to allow the target temperature strategy level to be reduced, but does not directly cause the circuit breaker to close automatically. For circuit breakers that have already tripped, they can be manually closed by maintenance personnel after a safety check is completed. For contactor 42, it can be reclosed based on a control signal when the target temperature strategy level is reduced and other operating conditions are met.

[0101] The degradation duration corresponding to different target temperature strategy levels can be increased as the target temperature strategy level increases, for example, set to 30s, 60s, 120s, and 300s respectively, so that the temperature strategy level with higher temperature risk has a longer observation time. The above-mentioned degradation preset temperature and degradation duration can be determined based on the thermal inertia of high-voltage electrical components, the heat dissipation capacity of liquid cooling plate 30, and temperature test results.

[0102] After updating the target temperature strategy level, return to the step of adjusting the coolant flow rate according to the liquid cooling adjustment parameters corresponding to the target temperature strategy level in the target operating condition parameter group, and redetermine the coolant flow rate according to the reduced target temperature strategy level. If the temperature rises again or other situations require maintaining or increasing the target temperature strategy level during the downgrade judgment process, stop the downgrade timing to avoid reducing the coolant flow rate before the temperature has stabilized and fallen back.

[0103] In a preferred embodiment, the energy storage high-voltage box includes a liquid-cooled high-voltage integrated module, which includes a liquid-cooled plate 30, a first stacked busbar 23, a second stacked busbar 45, a fuse 22, a contactor 42, and a shunt 44; the energy storage high-voltage box also includes a positive copper busbar, a negative copper busbar, and an energy storage converter connector; A liquid cooling plate 30 is disposed between a first stacked busbar 23 and a second stacked busbar 45. The first stacked busbar 23 and the second stacked busbar 45 are thermally bonded to the two opposite surfaces of the liquid cooling plate 30, respectively. The first stacked busbar 23 is electrically connected to a fuse 22, and the second stacked busbar 45 is electrically connected to a contactor 42 and a shunt 44, respectively. The positive and negative copper busbars are electrically connected to the positive and negative terminals of the energy storage converter connector, respectively. Multiple temperature acquisition points include: A first temperature acquisition point is set at the connection position of the first stacked busbar 23 near the fuse 22, and a second temperature acquisition point is set in the area of ​​the first stacked busbar 23 away from the connection position of the fuse 22; A third temperature acquisition point is set at the connection position of the second stacked busbar 45 near the contactor 42, and a fourth temperature acquisition point is set at the connection position of the second stacked busbar 45 near the shunt 44. The fifth and sixth temperature acquisition points are respectively set at the positions of the positive and negative copper busbars near the connector of the energy storage converter. The seventh temperature acquisition point is set on the surface of the liquid cooling plate 30.

[0104] Please refer to Figure 3 and Figure 4 , Figure 3 This is a schematic diagram of the liquid-cooled high-pressure integrated module provided in this application. Figure 4 This is a schematic diagram of the energy storage high-voltage box provided in this application. It can be seen that two [units / items] can be installed in the energy storage high-voltage box. Figure 3 The liquid-cooled high-pressure integrated module shown is Figure 4 The coolant enters from one side through solenoid valve K, and is connected to the inlet of the liquid cooling plate in the liquid cooling plate integrated module through a pipeline. After heat exchange is completed in the liquid cooling plate, it exits from the liquid cooling plate outlet and is connected to the inlet of another liquid cooling plate integrated module through a pipeline. It then exits from the outlet and is connected to the solenoid valve K on the other side through a pipeline. This is the liquid cooling branch. The interfaces on both sides of the energy storage high-voltage box can be connected to the liquid cooling pipeline of the energy storage system.

[0105] In this embodiment, the liquid cooling plate 30 is disposed between the first stacked busbar 23 and the second stacked busbar 45, and the first stacked busbar 23 and the second stacked busbar 45 are thermally bonded to the two opposite surfaces of the liquid cooling plate 30, respectively. In one embodiment, the first stacked busbar 23 and the second stacked busbar 45 are thermally bonded to the liquid cooling plate 30 through thermally conductive insulating layers. The thermally conductive insulating layer can be a thermally conductive gel, a thermally conductive silicone pad, or other materials that combine thermal conductivity and electrical insulation properties, used to fill the tiny gaps between the stacked busbars and the liquid cooling plate 30, and to electrically isolate the charged stacked busbars from the metal liquid cooling plate 30.

[0106] The first stacked busbar 23 is electrically connected to the fuse 22. The heat generated by the fuse 22 is transferred to the first stacked busbar 23 through the connection point between the fuse 22 and the first stacked busbar 23, and then through the first stacked busbar 23 and the thermally conductive insulation layer to the liquid cooling plate 30. The second stacked busbar 45 is electrically connected to the contactor 42 and the shunt 44 respectively. The heat generated by the contactor 42 and the shunt 44 is transferred to the second stacked busbar 45 through the corresponding connection points, and then through the second stacked busbar 45 and the thermally conductive insulation layer to the liquid cooling plate 30.

[0107] Both the first stacked busbar 23 and the second stacked busbar 45 may include multiple mutually insulated copper layers or multiple conductive areas. The stacked busbars serve both to achieve electrical connections between corresponding high-voltage electrical components and to increase the heat conduction area between the high-voltage electrical components and the liquid-cooled plate 30. The first stacked busbar 23 can be connected to the fuse 22 by bolting or crimping, and the second stacked busbar 45 can be connected to the contactor 42 or the shunt 44 by bolting, crimping, or laser welding. The connection method is not limited to the above examples; any method that meets the corresponding current carrying capacity, mechanical strength, and thermal conductivity requirements is acceptable.

[0108] The positive and negative copper busbars are electrically connected to the positive and negative terminals of the energy storage converter connector, respectively, to connect the positive and negative circuits of the energy storage high-voltage box to the energy storage converter. The positions of the positive and negative copper busbars near the energy storage converter connector are not necessarily within the direct heat dissipation coverage of the liquid cooling plate 30; therefore, temperature monitoring can be performed separately at these locations.

[0109] Multiple temperature acquisition points include the first temperature acquisition point to the seventh temperature acquisition point, namely the first temperature acquisition point T1, the second temperature acquisition point T2, the third temperature acquisition point T3, the fourth temperature acquisition point T4, the fifth temperature acquisition point T5, the sixth temperature acquisition point T6, and the seventh temperature acquisition point T7.

[0110] The first temperature acquisition point is located on the surface of the first stacked busbar 23 near the connection position of the fuse 22, and is used to collect the temperature near the connection position between the fuse 22 and the first stacked busbar 23. The first temperature acquisition point is not directly located inside the fuse 22, but is located on the first stacked busbar 23 at a position that can reflect the heat transfer from the fuse 22 to the first stacked busbar 23.

[0111] The second temperature acquisition point is located in the area of ​​the first stacked busbar 23 away from the connection position of the fuse 22, for example, it can be located in the middle of the first stacked busbar 23. The second temperature acquisition point is used to reflect the temperature after heat is conducted from the connection position of the fuse 22 through the first stacked busbar 23 and carried away by the liquid cooling plate 30.

[0112] The third temperature acquisition point is located on the surface of the second busbar 45 near the connection point of the contactor 42. The third temperature acquisition point acquires the temperature of the connection point of the second busbar 45 near the contactor 42, not the temperature of the contactor 42 body or its internal contacts. When the contactor 42 does not have an internal temperature detection location for direct installation of a temperature sensor, the heating state of the contactor 42 terminals and their connection points can be indirectly reflected through the third temperature acquisition point.

[0113] The fourth temperature acquisition point is located on the surface of the second stacked busbar 45 near the connection position of the shunt 44. This fourth temperature acquisition point collects the temperature at the connection position of the second stacked busbar 45 near the shunt 44, rather than directly collecting the temperature inside the shunt 44. The third and fourth temperature acquisition points can also be used for long-term monitoring of the reliability of the connection process between the second stacked busbar 45 and the contactor 42 and shunt 44.

[0114] The fifth and sixth temperature sampling points are located near the positive and negative copper busbars, respectively, close to the energy storage converter connector, to reflect the temperatures near the positive and negative connection terminals of the energy storage converter connector. Since the current flowing through the positive and negative circuits is usually the same, the temperatures at the fifth and sixth sampling points should be similar under normal circumstances. When the contact resistance at one connection terminal increases, the temperature at that corresponding sampling point will rise relative to the other.

[0115] The seventh temperature sampling point is located on the surface of the liquid cooling plate 30 to reflect the temperature of the liquid cooling plate 30 itself and its heat dissipation status. This seventh temperature sampling point is not the coolant inlet temperature sampling point and cannot be directly equated to the inlet water temperature of the liquid cooling branch.

[0116] The inlet water temperature of the liquid cooling branch can be obtained through a separate temperature sensor installed on the inlet pipe, or received from the battery pack liquid cooling circuit or the liquid cooling unit. When the liquid cooling branch is connected in series with the battery pack liquid cooling circuit, an inlet water temperature sensor can be installed at the inlet of the liquid cooling branch in the energy storage high-voltage box; when the liquid cooling branch is directly supplied with liquid by the liquid cooling unit, the supply temperature sent by the liquid cooling unit can be received. As an example, an abnormal inlet water temperature warning can be output when the inlet water temperature exceeds 35°C. Inlet water temperature monitoring and temperature monitoring at the seventh temperature acquisition point can be set simultaneously, or one can be selected according to the sensor configuration of the liquid cooling system.

[0117] Through the arrangement of the above temperature acquisition points, the first to fourth temperature acquisition points can reflect the temperature of the connection positions of the fuse 22, the first stacked busbar 23, the contactor 42, and the shunt 44, respectively. The fifth and sixth temperature acquisition points can reflect the temperature near the positive and negative connection terminals of the energy storage converter connector. The seventh temperature acquisition point can reflect the temperature of the liquid cooling plate 30, thereby providing temperature data for the determination of the highest temperature and subsequent local anomaly determination.

[0118] In one specific structure, a first temperature sampling point can be located on the surface of the positive conductive layer of the first stacked busbar 23 near the connection position of the fuse 22; a second temperature sampling point can be located on the area of ​​the negative conductive layer of the first stacked busbar 23 away from the connection position of the fuse 22; a third temperature sampling point can be located on the surface of the positive conductive layer of the second stacked busbar 45 near the connection position of the contactor 42; and a fourth temperature sampling point can be located on the surface of the negative conductive layer of the second stacked busbar 45 near the connection position of the shunt 44. The third and fourth temperature sampling points are used to monitor the temperature status at the connection positions of the second stacked busbar 45 with the contactor 42 and the shunt 44, respectively, to characterize the long-term operational reliability of the stacked busbar connection structure.

[0119] As a preferred embodiment, after determining the corresponding target temperature strategy level, the method further includes: Determine whether the temperature at the first temperature sampling point is the highest temperature; If the temperature at the first temperature acquisition point is not the highest temperature, and the target temperature strategy level is lower than the highest temperature strategy level, then the temperature strategy level, which is one level higher than the target temperature strategy level, will be updated to the target temperature strategy level. Then, the process will proceed to the step of adjusting the flow rate of the coolant flowing through the energy storage high-pressure box in the liquid cooling branch according to the liquid cooling adjustment parameter corresponding to the target temperature strategy level in the target operating condition parameter group.

[0120] In this embodiment, the fuse 22 typically has a relatively large equivalent resistance and a relatively concentrated heat generation location. Therefore, under the structural design of the energy storage high-voltage box and normal heat dissipation conditions, the first temperature acquisition point located at the connection position of the first stacked busbar 23 near the fuse 22 is usually the temperature acquisition point with the highest temperature among multiple temperature acquisition points. The temperature of the first temperature acquisition point can be compared with the highest temperature to determine whether the temperature distribution inside the energy storage high-voltage box meets expectations.

[0121] When the temperature at the first temperature sampling point equals the highest temperature, it indicates that the current highest temperature is located within the expected fuse 22 connection area, and the coolant flow rate can continue to be adjusted according to the liquid cooling adjustment parameters corresponding to the current target temperature strategy level. If multiple temperature sampling points have the same highest temperature, and the first temperature sampling point is one of the temperature sampling points with the highest temperature, the temperature at the first temperature sampling point can also be determined as the highest temperature.

[0122] When the temperature at the first temperature acquisition point is not the highest temperature, it indicates that the temperature rise at the connection position of contactor 42, the connection position of shunt 44, the connection position of energy storage converter connector, liquid cooling plate 30, or other monitored positions exceeds the temperature rise at the first temperature acquisition point, and the current temperature distribution is inconsistent with the expected temperature distribution with the fuse 22 connection area as the main heat-generating location.

[0123] If the temperature at the first temperature acquisition point is not the highest temperature and the target temperature strategy level is lower than the highest temperature strategy level, the temperature strategy level one level higher than the current target temperature strategy level will be updated to the target temperature strategy level. For example, if the original target temperature strategy level is Level 1, Level 2 will be updated to the target temperature strategy level; if the original target temperature strategy level is Level 2, Level 3 will be updated to the target temperature strategy level.

[0124] After updating the target temperature strategy level, the process proceeds to adjust the coolant flow rate according to the liquid cooling adjustment parameters corresponding to the updated target temperature strategy level in the target operating condition parameter group. If the target temperature strategy level is already the highest temperature strategy level, the operation of increasing the level by one level will not be performed. Instead, the preset maximum flow rate corresponding to the highest temperature strategy level will be maintained, and subsequent processing can be combined with the corresponding emergency shutdown protection.

[0125] As a preferred embodiment, after periodically acquiring the temperatures of multiple temperature sampling points at different locations within the energy storage high-voltage box, the method further includes: Determine the first temperature difference between the first temperature acquisition point and the second temperature acquisition point; Determine the second temperature difference between the first temperature acquisition point and the seventh temperature acquisition point; If the first temperature difference is not within the first temperature conduction range, and / or the second temperature difference is not within the second temperature conduction range, a check and prompt will be made regarding the bonding status of the stacked busbar and the liquid cooling plate 30.

[0126] In this embodiment, the first temperature difference ΔT 12 The temperature of the second temperature sampling point can be subtracted from the temperature of the first temperature sampling point, i.e.: ΔT 12 =T1 - T2; Where T1 represents the temperature at the first temperature acquisition point, and T2 represents the temperature at the second temperature acquisition point.

[0127] The first temperature sampling point is located near the connection point of fuse 22, and the second temperature sampling point is located in the area of ​​the first stacked busbar 23 away from the connection point of fuse 22. The heat generated at the connection point of fuse 22 is transferred to the liquid cooling plate 30 via the first stacked busbar 23. When the thermal conductivity between the first stacked busbar 23 and the liquid cooling plate 30 is normal and the liquid cooling plate 30 can dissipate heat, the first temperature sampling point near the connection point of fuse 22 is relatively high, while the second temperature sampling point away from the connection point of fuse 22 and near the heat dissipation area is relatively low, thus forming the expected first temperature difference.

[0128] The first temperature conduction range can be determined through prototype temperature rise tests based on the material of the first stacked busbar 23, the distance between the first temperature acquisition point and the second temperature acquisition point, the contact area between the first stacked busbar 23 and the liquid cooling plate 30, and the heat dissipation capacity of the liquid cooling plate 30. For example, when the first temperature difference is not less than 5℃, the temperature conduction distribution of the first stacked busbar 23 can be considered normal; when the first temperature difference is between 3℃ and 5℃, the temperature conduction distribution of the first stacked busbar 23 can be considered to be in an intermediate state, and the corresponding data should be recorded; when the first temperature difference is less than 3℃, the first temperature difference can be considered to be outside the first temperature conduction range.

[0129] A small temperature difference may indicate that the overall temperature of the first stacked busbar 23 is too high, and the liquid cooling plate 30 has failed to dissipate heat in time from the area far from the connection position of the fuse 22. It may also indicate that the thermally conductive bonding state between the first stacked busbar 23 and the liquid cooling plate 30 has changed. Therefore, the processor outputs a bonding state check prompt for the stacked busbar and the liquid cooling plate 30, prompting maintenance personnel to check whether the thermally conductive insulation layer is missing, aged, has abnormal thickness, or has a bonding gap, and to check the assembly state between the first stacked busbar 23 and the liquid cooling plate 30.

[0130] Second temperature difference ΔT 17 The temperature of the seventh temperature sampling point can be subtracted from the temperature of the first temperature sampling point, i.e.: ΔT 17 =T1 - T7; T7 represents the temperature of the seventh temperature sampling point.

[0131] The second temperature difference reflects the temperature gradient formed when heat is transferred from the connection point of fuse 22 through the first laminated busbar 23 and the thermally conductive insulation layer to the liquid cooling plate 30. The second temperature conduction range can be determined through prototype temperature rise testing. For example, the second temperature conduction range can be 10℃~30℃.

[0132] When the second temperature difference is between 10℃ and 30℃, the temperature gradient between the connection point of fuse 22 and liquid cooling plate 30 can be considered to be within the normal range. When the second temperature difference is greater than 30℃, it indicates that the temperature difference between the first temperature sampling point and liquid cooling plate 30 is too large, and there may be poor thermal conductivity and adhesion between the first stacked busbar 23 and liquid cooling plate 30. When the second temperature difference is less than 10℃, if the temperatures of both the first and seventh temperature sampling points are high, it may indicate that the temperature of liquid cooling plate 30 is close to the temperature of the connection point of fuse 22, and liquid cooling plate 30 has failed to transfer heat to the coolant in time.

[0133] Therefore, when the first temperature difference is outside the first temperature conduction range, and / or the second temperature difference is outside the second temperature conduction range, the processor will perform a check and prompt regarding the bonding status of the stacked busbar and the liquid cooling plate 30. This prompt can be sent to the battery management system, energy management system, or host computer, or stored in a fault log. For cases where the second temperature difference is too small and the temperature at the seventh temperature acquisition point is too high, the processor can also check the liquid supply temperature of the liquid cooling unit, the operating status of the circulating pump, and whether there is insufficient flow in the liquid cooling branch while checking the bonding status of the stacked busbar and the liquid cooling plate 30.

[0134] The first and second temperature differences are primarily used to determine the state of heat conduction and thermal bonding, and are not directly used in the aforementioned strategy of determining the target temperature level based on the highest temperature. By executing the highest temperature judgment and the temperature difference judgment separately, changes in the thermal bonding state can be identified in advance, before the highest temperature reaches the safety threshold.

[0135] As a preferred embodiment, after periodically acquiring the temperatures of multiple temperature sampling points at different locations within the energy storage high-voltage box, the method further includes: Determine the absolute difference between the temperatures at the fifth and sixth temperature acquisition points; If either the fifth or sixth temperature sampling point exceeds the preset connector warning temperature, an energy storage converter connector check warning will be issued. When the absolute difference is greater than the preset connector temperature difference, an alarm will be triggered to indicate temperature asymmetry between the positive and negative terminals of the energy storage converter connector.

[0136] In this embodiment, the absolute temperature difference ΔT between the fifth and sixth temperature acquisition points is... 56 It can be represented as: ΔT 56 =|T5-T6|; In this formula, T5 represents the temperature of the fifth temperature acquisition point, and T6 represents the temperature of the sixth temperature acquisition point.

[0137] The fifth temperature sampling point is located on the positive copper busbar near the energy storage converter connector, and the sixth temperature sampling point is located on the negative copper busbar near the energy storage converter connector. During charging and discharging of the energy storage system, the current magnitudes in the positive and negative circuits are usually the same. Therefore, given that the contact resistance and heat dissipation conditions at the positive and negative connection terminals are similar, the temperatures at the fifth and sixth temperature sampling points should be similar.

[0138] The preset connector warning temperature can be determined based on the rated operating temperature of the energy storage converter connector, the allowable temperature rise, and the temperature resistance range of the insulation material near the connector. For example, the preset connector warning temperature can be 45°C. The processor will issue a check warning for the energy storage converter connector if either the fifth or sixth temperature sampling point exceeds 45°C.

[0139] The energy storage converter connector inspection prompts can include checks on the bolt tightening force, mating status, contact surface cleanliness, and contact resistance of the energy storage converter connector. Since the energy storage converter connector may not be located within the direct heat dissipation coverage of the liquid cooling plate 30, simply increasing the coolant flow rate through the liquid cooling plate 30 may not effectively reduce the temperature of the energy storage converter connector. Therefore, when only the preset connector temperature is triggered and no other temperature protection conditions are triggered, an inspection prompt can be output without changing the coolant flow rate.

[0140] The preset connector temperature difference can be determined based on the test results of the temperature difference between the fifth and sixth temperature sampling points under normal connection conditions. For example, the preset connector temperature difference can be 5℃. When the absolute difference between the temperatures of the fifth and sixth temperature sampling points is greater than 5℃, it indicates that there is a temperature asymmetry between the positive and negative connection terminals of the energy storage converter connector, and the side with the higher temperature may have poor contact or increased contact resistance.

[0141] When the absolute temperature difference between the positive and negative terminals of the energy storage converter connector exceeds a preset connector temperature difference, the processor will issue a temperature asymmetry alarm for this connection. The temperature asymmetry alarm may include the connection with the higher temperature, the current temperatures of the fifth and sixth temperature sampling points, and the absolute difference between them, to help maintenance personnel identify the connection that needs inspection.

[0142] When either the fifth or sixth temperature acquisition point is higher than the preset connector warning temperature, and the absolute difference between the two is greater than the preset connector temperature difference, the energy storage converter connector check warning and the temperature asymmetry alarm warning can be output simultaneously.

[0143] As a preferred embodiment, after determining the corresponding target temperature strategy level, the method further includes: When the temperature at the seventh temperature acquisition point is higher than the preset liquid cooling plate temperature, if the target temperature strategy level is lower than the highest temperature strategy level, the temperature strategy level that is one level higher than the target temperature strategy level will be updated to the target temperature strategy level. The next step is to adjust the flow rate of the coolant flowing through the energy storage high-pressure tank in the liquid cooling branch according to the liquid cooling adjustment parameters corresponding to the target temperature strategy level in the target operating condition parameter group.

[0144] In this embodiment, the seventh temperature acquisition point is located on the surface of the liquid cooling plate 30. The temperature at the seventh temperature acquisition point can reflect the wall temperature of the liquid cooling plate 30 and the heat exchange state between the liquid cooling plate 30 and the coolant. The preset liquid cooling plate temperature can be determined based on the normal liquid supply temperature of the liquid cooling unit, the temperature difference between the liquid cooling plate 30 and the coolant, and the allowable temperature of the liquid cooling plate 30. For example, the preset liquid cooling plate temperature can be 25°C.

[0145] When the temperature at the seventh temperature sampling point is higher than the preset liquid cooling plate temperature, it may indicate that the coolant temperature supplied by the liquid cooling unit is too high, the coolant flow rate in the liquid cooling branch is insufficient, the circulating pump's operating power is insufficient, or the heat exchange state of the internal flow channel of the liquid cooling plate 30 has changed. Since the seventh temperature sampling point samples the surface temperature of the liquid cooling plate 30, this temperature cannot be directly used as the coolant inlet temperature, but it can reflect the coolant supply status and the heat dissipation status of the liquid cooling plate 30 from the side surface of the liquid cooling plate 30.

[0146] When the temperature at the seventh temperature sampling point is higher than the preset liquid cooling plate temperature and the target temperature policy level is lower than the highest temperature policy level, the processor will update the temperature policy level, which is one level higher than the current target temperature policy level, to the target temperature policy level. For example, if the original target temperature policy level is Level 1, it will be updated to Level 2.

[0147] Based on the updated target temperature strategy level, the processor reads the corresponding liquid cooling regulation parameters from the target operating condition parameter group and adjusts the coolant flow rate through the energy storage high-pressure tank in the liquid cooling branch. By increasing the target temperature strategy level, the circulating pump power can be increased, the flow control valve opening can be increased, or the target coolant flow rate can be directly increased.

[0148] When the target temperature strategy level is already at the highest temperature strategy level, the target temperature strategy level will not be increased further. Instead, the preset maximum flow rate will be maintained, and a liquid chiller status check prompt can be output to check the liquid supply temperature of the liquid chiller, the operating status of the circulating pump, the opening of the flow regulating valve, and the flow status of the liquid cooling branch.

[0149] In an alternative implementation, if the liquid cooling unit can directly provide the coolant inlet temperature, the processor can also receive the coolant inlet temperature. When the coolant inlet temperature is higher than 35°C, an abnormal coolant inlet temperature warning is output.

[0150] As a preferred embodiment, after determining the corresponding target temperature strategy level, the method further includes: For each temperature acquisition point, the rate of temperature change is determined based on the temperatures obtained at two adjacent sampling times. When the rate of temperature change at any temperature acquisition point is greater than the preset rate of change, if the target temperature strategy level is lower than the highest temperature strategy level, the temperature strategy level that is one level higher than the target temperature strategy level will be updated to the target temperature strategy level. The next step is to adjust the flow rate of the coolant flowing through the energy storage high-pressure tank in the liquid cooling branch according to the liquid cooling adjustment parameters corresponding to the target temperature strategy level in the target operating condition parameter group.

[0151] In this embodiment, for the i-th temperature acquisition point, the temperature change rate V corresponding to the k-th sampling time is... i (k) can be represented as: V i (k)=[T i (k)-T i (k-1)] / [t(k)-t(k-1)]; Among them, T i (k) represents the temperature of the i-th temperature sampling point at the k-th sampling time, T i (k-1) represents the temperature of the i-th temperature sampling point at the (k-1)-th sampling time, t(k) represents the k-th sampling time, t(k-1) represents the (k-1)-th sampling time, and t(k)-t(k-1) represents the time interval between two adjacent sampling times.

[0152] The preset sampling period can be 1 minute. In this case, the temperature difference between two adjacent sampling times can represent the rate of temperature change in °C / min. For example, if the current temperature is 48 °C and the temperature at the previous sampling time was 42 °C, then the rate of temperature change is 6 °C / min.

[0153] In another implementation, the preset sampling period can be 1 second. In this case, the temperature difference between two adjacent sampling times can be divided by 1 second and then converted to °C / min. The preset sampling period can also be other durations, as long as the actual sampling time interval is used when calculating the rate of temperature change.

[0154] This embodiment determines the temperature change rate based on the temperatures at two adjacent sampling times, eliminating the need for curve fitting of multiple temperature samples within a single time window. When it is necessary to reduce the impact of measurement noise, the temperatures at each sampling time can be filtered first, and then the temperature change rate can be determined based on two adjacent filtered temperatures.

[0155] The preset rate of change can be determined based on the temperature rise rate of the high-voltage electrical components in the energy storage high-voltage box under normal operating conditions, the heat dissipation response speed of the liquid cooling plate 30, and the temperature rise trend that needs to be protected in advance. For example, the preset rate of change can be 5℃ / min.

[0156] When the rate of temperature change at all temperature acquisition points is less than or equal to the preset rate of change, the temperature change inside the energy storage high-pressure box can be considered to be in a relatively stable state, and the coolant flow rate can continue to be adjusted according to the liquid cooling adjustment parameters corresponding to the current target temperature strategy level.

[0157] When the rate of temperature change at any temperature sampling point exceeds the preset rate of change, it indicates that the temperature at that location is rising rapidly. Even if the current highest temperature has not yet exceeded the temperature threshold corresponding to the next temperature strategy level, the target temperature strategy level can be increased in advance.

[0158] If the target temperature policy level is lower than the highest temperature policy level, the processor will update the temperature policy level to the target temperature policy level, which is one level higher than the current target temperature policy level, and adjust the coolant flow rate according to the liquid cooling adjustment parameters corresponding to the updated target temperature policy level. For example, if the current target temperature policy level is Level 1 and the temperature change rate at any temperature sampling point is greater than 5℃ / min, it can be updated to Level 2 as the target temperature policy level before the highest temperature reaches 55℃.

[0159] When the target temperature policy level is already at the highest temperature policy level, the target temperature policy level will not be increased further. Instead, the preset maximum flow rate will be maintained, and the system will be handled according to the safety protection method corresponding to the highest temperature policy level.

[0160] As a preferred embodiment, after determining the corresponding target temperature strategy level, the method further includes: When the temperature at the fifth or sixth temperature acquisition point is greater than the preset connector alarm temperature, or the temperature at the first temperature acquisition point is greater than the preset fuse alarm temperature, the target temperature strategy level will be raised to no less than the preset alarm strategy level. The next step is to adjust the flow rate of the coolant flowing through the energy storage high-pressure tank in the liquid cooling branch according to the liquid cooling adjustment parameters corresponding to the target temperature strategy level in the target operating condition parameter group.

[0161] In this embodiment, the preset connector alarm temperature can be higher than the preset connector indication temperature. The preset connector indication temperature is used to prompt maintenance personnel to check the energy storage converter connector, while the preset connector alarm temperature is used to directly increase the target temperature strategy level when the connector temperature reaches a high level. For example, the preset connector indication temperature can be 45°C, and the preset connector alarm temperature can be 60°C.

[0162] The preset fuse alarm temperature can be determined based on the rated operating temperature of fuse 22, the allowable temperature rise at the connection point between fuse 22 and the first stacked busbar 23, and high-temperature protection requirements. For example, the preset fuse alarm temperature can be 65°C.

[0163] The preset alarm strategy level can be the temperature strategy level corresponding to suspending charging and discharging and disconnecting contactor 42. For example, among the five temperature strategy levels from Level 0 to Level 4, the preset alarm strategy level can be Level 3.

[0164] When the temperature at the fifth or sixth temperature sampling point exceeds the preset connector alarm temperature, it indicates a high temperature risk at the positive or negative connection terminal of the energy storage converter connector. The processor will then raise the target temperature policy level to at least the preset alarm policy level.

[0165] When the temperature at the first temperature acquisition point exceeds the preset fuse alarm temperature, it indicates that the temperature at the connection point of fuse 22 has reached the alarm condition. The processor will also raise the target temperature policy level to no lower than the preset alarm policy level.

[0166] Raising the alarm policy level to at least the preset level means: when the original target temperature policy level is lower than the preset alarm policy level, the preset alarm policy level is directly updated to the target temperature policy level; when the original target temperature policy level is equal to or higher than the preset alarm policy level, the original target temperature policy level is maintained. For example, if the preset alarm policy level is Level 3, and the original target temperature policy level is Level 1 or Level 2, it can be directly updated to Level 3; if the original target temperature policy level is Level 4, it remains Level 4.

[0167] This rapid alarm escalation is not limited by the conventional step-by-step escalation path and can be executed immediately when the temperature conditions are met, without setting a delay time. After the target temperature policy level is updated, the processor enters the step of adjusting the coolant flow rate according to the liquid cooling adjustment parameters corresponding to the target temperature policy level in the target operating condition parameter group.

[0168] In addition, after the target temperature strategy level is raised to Level 3, the energy storage system can be controlled to suspend charging and discharging, control contactor 42 to disconnect and output a high temperature alarm signal; if other conditions cause the target temperature strategy level to reach Level 4, emergency shutdown and circuit breaker tripping control will be further executed.

[0169] As a preferred embodiment, after adjusting the coolant flow rate through the energy storage high-pressure tank in the liquid cooling branch according to the liquid cooling adjustment parameters corresponding to the target temperature strategy level in the target operating condition parameter group, the method further includes: If the target temperature strategy level is lower than the highest temperature strategy level, and the temperature of any temperature acquisition point is detected to be higher than the preset upgrade temperature corresponding to the target temperature strategy level, the temperature strategy level one level higher than the target temperature strategy level will be updated to the target temperature strategy level. Return to the steps of adjusting the coolant flow rate through the energy storage high-pressure tank in the liquid cooling branch according to the liquid cooling adjustment parameters corresponding to the target temperature strategy level in the target operating condition parameter group.

[0170] In this embodiment, after performing coolant flow regulation, the processor continues to periodically acquire the temperature of multiple temperature sampling points and determines whether the temperature of any temperature sampling point is higher than the upgrade preset temperature corresponding to the current target temperature policy level. The upgrade preset temperature can be the upper limit of the preset temperature range corresponding to the current target temperature policy level.

[0171] For example, the preset upgrade temperature for Level 0 can be 40℃, for Level 1 it can be 55℃, for Level 2 it can be 65℃, and for Level 3 it can be 85℃. When the current target temperature strategy level is Level 1 and the temperature at any temperature sampling point is greater than 55℃, the conditions for upgrading from Level 1 to Level 2 are met.

[0172] If the target temperature policy level is lower than the highest temperature policy level, and the temperature of any temperature acquisition point is detected to be higher than the upgrade preset temperature corresponding to the current target temperature policy level, the processor will update the temperature policy level, which is one level higher than the current target temperature policy level, to the target temperature policy level.

[0173] Standard upgrades are performed immediately. The processor updates the target temperature policy level as soon as it detects that the upgrade conditions are met, without waiting for the temperature to continuously reach the preset upgrade temperature. After updating the target temperature policy level, the processor returns to the step of adjusting the coolant flow rate according to the liquid cooling adjustment parameters corresponding to the target temperature policy level in the target operating condition parameter group. It reads the updated liquid cooling adjustment parameters from the target operating condition parameter group and increases the coolant flow rate.

[0174] For example, if the target operating condition parameter group is operating condition parameter group B, and the current target temperature strategy level is Level 1, the coolant flow rate can be 0.8L / min~1.5L / min; when the temperature at any temperature acquisition point is greater than 55℃, Level 2 will be updated to the target temperature strategy level, and the coolant flow rate will be adjusted accordingly to 2.0L / min~4.0L / min.

[0175] When multiple escalation and degrade conditions occur simultaneously within the same judgment period, the escalation condition takes precedence, and the degrade timer is cleared or paused. Rapid alarm escalation triggered by a specific temperature acquisition point takes precedence over regular step-by-step escalation. For example, when the connector temperature or fuse 22 temperature reaches the rapid alarm condition, it can be directly escalated to the preset alarm strategy level, instead of just one level.

[0176] When the target temperature policy level is already at the highest temperature policy level, the operation of increasing the level by one level will not be performed. Instead, the preset maximum flow rate will be maintained, and the emergency shutdown protection corresponding to the highest temperature policy level will be executed. By implementing upgrades immediately, downgrading with a delay, and prioritizing upgrades over downgrading, the repeated switching of temperature policy levels around the threshold can be reduced.

[0177] Please refer to Figure 5 , Figure 5 A schematic diagram of a temperature control device for an energy storage high-voltage box provided in this application is provided. The device includes: Memory 51 is used to store computer programs; The processor 52 is used to implement the steps of the temperature control method for the energy storage high-pressure box as described above when executing a computer program.

[0178] For a description of the temperature control device for the energy storage high-voltage box provided by the present invention, please refer to the above method embodiments; the present invention will not be described again here.

[0179] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0180] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A temperature control method of an energy storage high voltage tank, characterized by, The method is applied to an energy storage system, the energy storage system including an energy storage high-voltage box and a liquid-cooled branch corresponding to the energy storage high-voltage box, and includes: The pre-configured cell capacity specifications and charge / discharge rates of the energy storage system are obtained, and a target operating condition parameter group is determined from multiple operating condition parameter groups based on the cell capacity specifications and the charge / discharge rates. Each operating condition parameter group includes a correspondence between multiple temperature strategy levels and multiple liquid cooling adjustment parameters. Multiple preset temperature ranges correspond to multiple temperature strategy levels, and the multiple temperature strategy levels are arranged from low to high according to their corresponding preset temperature ranges. As the temperature strategy level increases, the coolant flow rate corresponding to the liquid cooling adjustment parameter gradually increases, and the preset maximum flow rate is maintained after reaching the preset maximum flow rate. The temperature of multiple temperature acquisition points at different locations inside the energy storage high-voltage box is periodically acquired, and the highest temperature is determined based on the temperatures of the multiple temperature acquisition points. Based on the preset temperature range in which the highest temperature falls, determine the corresponding target temperature strategy level; Adjust the flow rate of coolant flowing through the energy storage high-pressure tank in the liquid cooling branch according to the liquid cooling adjustment parameters corresponding to the target temperature strategy level in the target operating condition parameter group.

2. The temperature control method of the energy storage high voltage tank according to claim 1, wherein, After determining the corresponding target temperature strategy level, the following is also included: When the target temperature strategy level is lower than the first preset strategy level, the energy storage system is controlled to operate according to the pre-configured charge and discharge rate; When the target temperature strategy level is not lower than the first preset strategy level but is lower than the second preset strategy level, the charge / discharge rate of the energy storage system is reduced. When the target temperature strategy level is not lower than the second preset strategy level but is lower than the third preset strategy level, the energy storage system is controlled to suspend charging and discharging. When the target temperature strategy level is not lower than the third preset strategy level, the energy storage system is controlled to shut down urgently. The first preset strategy level, the second preset strategy level, and the third preset strategy level are three of the multiple temperature strategy levels, and are arranged from low to high according to their corresponding preset temperature ranges.

3. The temperature control method for the energy storage high-voltage box as described in claim 2, characterized in that, The energy storage high-voltage box is connected between the battery cluster and the energy storage converter. The energy storage high-voltage box includes a contactor and a circuit breaker. The contactor and the circuit breaker are connected in series in the high-voltage circuit between the battery cluster and the energy storage converter. After determining the corresponding target temperature strategy level, the following is also included: When the target temperature strategy level is not lower than the second preset strategy level but lower than the third preset strategy level, the contactor is controlled to disconnect to cut off the high-voltage circuit and output a high temperature alarm signal. When the target temperature strategy level is not lower than the third preset strategy level, the circuit breaker is controlled to trip to cut off the high-voltage circuit and output an emergency shutdown alarm signal.

4. The temperature control method for the energy storage high-voltage box as described in claim 2, characterized in that, After adjusting the coolant flow rate through the energy storage high-pressure tank in the liquid cooling branch according to the liquid cooling adjustment parameters corresponding to the target temperature strategy level in the target operating condition parameter group, the method further includes: When the target temperature strategy level is higher than the lowest temperature strategy level and lower than the second preset strategy level, if the temperature of each temperature acquisition point is lower than the downgrade preset temperature corresponding to the target temperature strategy level, and the duration reaches the downgrade duration corresponding to the target temperature strategy level, then the temperature strategy level that is one level lower than the target temperature strategy level will be updated to the target temperature strategy level. When the target temperature strategy level is not lower than the second preset strategy level, if the temperature of each temperature acquisition point is lower than the downgrade preset temperature corresponding to the target temperature strategy level, the duration reaches the downgrade duration corresponding to the target temperature strategy level, and a manual downgrade instruction is received, then the temperature strategy level that is one level lower than the target temperature strategy level is updated to the target temperature strategy level. Return to the step of adjusting the flow rate of coolant flowing through the energy storage high-pressure tank in the liquid cooling branch according to the liquid cooling adjustment parameters corresponding to the target temperature strategy level in the target operating condition parameter group.

5. The temperature control method for the energy storage high-voltage box as described in claim 1, characterized in that, The energy storage high-voltage box includes a liquid-cooled high-voltage integrated module, which includes a liquid-cooled plate, a first stacked busbar, a second stacked busbar, a fuse, a contactor, and a shunt; the energy storage high-voltage box also includes a positive copper busbar, a negative copper busbar, and an energy storage converter connector; The liquid cooling plate is disposed between the first stacked busbar and the second stacked busbar, with the first and second stacked busbars thermally bonded to their respective opposite surfaces. The first stacked busbar is electrically connected to the fuse, and the second stacked busbar is electrically connected to the contactor and the shunt, respectively. The positive and negative copper busbars are electrically connected to the positive and negative terminals of the energy storage converter connector, respectively. The plurality of temperature acquisition points include: A first temperature acquisition point is set at the connection position of the first stacked busbar near the fuse, and a second temperature acquisition point is set in the area of ​​the first stacked busbar away from the connection position of the fuse; A third temperature acquisition point is set at the connection position of the second stacked busbar near the contactor, and a fourth temperature acquisition point is set at the connection position of the second stacked busbar near the shunt. The fifth and sixth temperature acquisition points are respectively set at the positions of the positive copper busbar and the negative copper busbar near the connector of the energy storage converter; The seventh temperature acquisition point is set on the surface of the liquid cooling plate.

6. The temperature control method for the energy storage high-voltage box as described in claim 5, characterized in that, After determining the corresponding target temperature strategy level, the following is also included: Determine whether the temperature at the first temperature acquisition point is the highest temperature; If the temperature at the first temperature acquisition point is not the highest temperature, and the target temperature strategy level is lower than the highest temperature strategy level, then the temperature strategy level, which is one level higher than the target temperature strategy level, is updated to the target temperature strategy level, and the process proceeds to the step of adjusting the flow rate of the coolant flowing through the energy storage high-pressure box in the liquid cooling branch according to the liquid cooling adjustment parameter corresponding to the target temperature strategy level in the target operating condition parameter group.

7. The temperature control method for the energy storage high-voltage box as described in claim 5, characterized in that, After periodically acquiring the temperatures of multiple temperature sampling points at different locations within the energy storage high-voltage box, the method further includes: Determine the first temperature difference between the first temperature acquisition point and the second temperature acquisition point; Determine the second temperature difference between the first temperature acquisition point and the seventh temperature acquisition point; If the first temperature difference is not within the first temperature conduction range, and / or the second temperature difference is not within the second temperature conduction range, a check and prompt will be made regarding the bonding status of the stacked busbar and the liquid cooling plate.

8. The temperature control method for the energy storage high-voltage box as described in claim 5, characterized in that, After periodically acquiring the temperatures of multiple temperature sampling points at different locations within the energy storage high-voltage box, the method further includes: Determine the absolute difference between the temperatures at the fifth temperature acquisition point and the sixth temperature acquisition point; If either the fifth temperature acquisition point or the sixth temperature acquisition point is higher than the preset connector warning temperature, an energy storage converter connector check warning will be issued. When the absolute difference is greater than the preset connector temperature difference, an alarm is triggered to indicate temperature asymmetry between the positive and negative terminals of the energy storage converter connector.

9. The temperature control method for the energy storage high-voltage box as described in claim 5, characterized in that, After determining the corresponding target temperature strategy level, the following is also included: When the temperature at the seventh temperature acquisition point is higher than the preset liquid cooling plate temperature, if the target temperature strategy level is lower than the highest temperature strategy level, then the temperature strategy level that is one level higher than the target temperature strategy level will be updated to the target temperature strategy level. The step involves adjusting the flow rate of the coolant flowing through the energy storage high-pressure tank in the liquid cooling branch according to the liquid cooling adjustment parameters corresponding to the target temperature strategy level in the target operating condition parameter group.

10. The temperature control method for the energy storage high-voltage box as described in claim 5, characterized in that, After determining the corresponding target temperature strategy level, the following is also included: For each temperature acquisition point, the rate of temperature change is determined based on the temperatures obtained at two adjacent sampling times. When the temperature change rate at any of the temperature acquisition points is greater than the preset change rate, if the target temperature strategy level is lower than the highest temperature strategy level, then the temperature strategy level that is one level higher than the target temperature strategy level will be updated to the target temperature strategy level. The step involves adjusting the flow rate of the coolant flowing through the energy storage high-pressure tank in the liquid cooling branch according to the liquid cooling adjustment parameters corresponding to the target temperature strategy level in the target operating condition parameter group.

11. The temperature control method for the energy storage high-voltage box as described in claim 5, characterized in that, After determining the corresponding target temperature strategy level, the following is also included: When the temperature of the fifth temperature acquisition point or the sixth temperature acquisition point is greater than the preset connector alarm temperature, or the temperature of the first temperature acquisition point is greater than the preset fuse alarm temperature, the target temperature strategy level is raised to no less than the preset alarm strategy level. The step involves adjusting the flow rate of the coolant flowing through the energy storage high-pressure tank in the liquid cooling branch according to the liquid cooling adjustment parameters corresponding to the target temperature strategy level in the target operating condition parameter group.

12. The temperature control method for the energy storage high-voltage box as described in any one of claims 1 to 11, characterized in that, After adjusting the coolant flow rate through the energy storage high-pressure tank in the liquid cooling branch according to the liquid cooling adjustment parameters corresponding to the target temperature strategy level in the target operating condition parameter group, the method further includes: When the target temperature strategy level is lower than the highest temperature strategy level, and the temperature of any of the temperature acquisition points is detected to be higher than the upgrade preset temperature corresponding to the target temperature strategy level, the temperature strategy level that is one level higher than the target temperature strategy level is updated to the target temperature strategy level. Return to the step of adjusting the flow rate of coolant flowing through the energy storage high-pressure tank in the liquid cooling branch according to the liquid cooling adjustment parameters corresponding to the target temperature strategy level in the target operating condition parameter group.

13. A temperature control device for an energy storage high-voltage box, characterized in that, include: Memory, used to store computer programs; A processor, configured to, when executing a computer program, implement the steps of the temperature control method for an energy storage high-voltage box as described in any one of claims 1 to 12.

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