Thermal management control method and device

Abstract

The present invention discloses a thermal management control method and device, which relates to the field of battery management technology. The method includes: a circulating pump draws liquid medium from a liquid storage tank into a battery box; a control device opens a first solenoid valve and a second solenoid valve, and adjusts the power of the circulating pump and the temperature control power of a temperature control device in real time according to the temperature difference, until the absolute value of the temperature difference is less than a first preset value; when the absolute value of the temperature difference between the temperature detected by the temperature sensor and the first preset temperature is greater than a second preset value and less than a third preset value, the control device closes the first solenoid valve, opens the second solenoid valve and the third solenoid valve, and the circulating pump draws the liquid medium in the battery box into the liquid storage tank; after the temperature control device adjusts the liquid medium to the second preset temperature, the circulating pump draws the liquid medium in the liquid storage tank into the battery box. The method according to an embodiment of the present invention can improve the temperature management effect.

Description

Technical Field

[0001] The present invention relates to the technical field of battery management, and in particular to a thermal management control method and device. Background Art

[0002] The battery is immersed in a liquid medium in the immersion energy storage battery box, and the temperature and temperature difference are controlled by circulating the liquid medium. In practical applications, the fluidity and uniformity of the liquid medium are affected due to viscous resistance and friction with the battery cell or the box wall, resulting in poor temperature control and significantly reduced efficiency after long-term operation. The traditional solution is to use larger-diameter pipes or higher pressures to accelerate the circulation of liquids and shorten the maintenance cycle of equipment, but this will increase system costs and reduce available time. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a thermal management control method and device, which can improve the temperature control effect.

[0004] In a first aspect, a thermal management control method according to an embodiment of the present invention is applied to an immersed energy storage battery system, wherein the immersed energy storage battery system comprises: a plurality of battery boxes connected in parallel, a liquid storage tank, a circulation pump and a temperature regulating device, wherein the liquid storage tank stores a liquid medium, and the temperature regulating device is used to regulate the temperature of the liquid medium; the method comprises:

[0005] The circulation pump extracts the liquid medium from the liquid storage tank and enters the battery box; a first solenoid valve is provided between the liquid inlet of each battery box and the liquid outlet of the liquid storage tank, a second solenoid valve is provided between the liquid outlet of each battery box and one end of the circulation pump, the other end of the circulation pump is communicated with the liquid inlet of the liquid storage tank, a temperature sensor and a ventilation port are provided in each battery box, the ventilation port is communicated with the liquid storage tank, and a third solenoid valve is provided at the ventilation port;

[0006] When the temperature sensor detects that the absolute value of the temperature difference between the battery temperature and the first preset temperature is between the first preset value and the second preset value, the first solenoid valve and the second solenoid valve are opened, and the power of the circulation pump and the temperature control power of the temperature control device are adjusted in real time according to the temperature difference, until the absolute value of the temperature difference is less than the first preset value; and the second preset value is greater than the first preset value;

[0007] When the absolute value of the temperature difference between the battery temperature and the first preset temperature is between the second preset value and the third preset value, the first solenoid valve is closed, and the second solenoid valve and the third solenoid valve are opened, and the circulating pump draws the liquid medium in the battery box to the liquid storage tank. After the temperature control device adjusts the liquid medium to the second preset temperature, the second solenoid valve is closed, and the first solenoid valve and the third solenoid valve are opened, and the circulating pump draws the liquid medium in the liquid storage tank to the battery box; the third preset value is greater than the second preset value.

[0008] According to some embodiments of the present invention, the method further comprises:

[0009] When the temperature sensor detects that the battery temperature is greater than the third preset value, there is a thermal runaway battery in the battery box, and the first solenoid valve, the second solenoid valve and the third solenoid valve of the battery box are opened, and the first solenoid valve, the second solenoid valve and the third solenoid valve of other battery boxes are closed, so that the circulation pump runs at maximum power and the temperature control device cools down at maximum power.

[0010] According to some embodiments of the present invention, a heat exchanger is provided between the liquid storage tank and the battery box, a heat-conducting coil is provided in the heat exchanger, and the liquid inlet of each battery box is connected to the liquid outlet of the liquid storage tank after passing through the heat exchanger through a liquid inlet pipe; the temperature control device includes a heating element and a refrigerator, the heating element is provided in the liquid storage tank, the outlet of the refrigerator is connected to one end of the heat-conducting coil through a gas pipeline, the other end of the heat-conducting coil is connected to one end of an air pump through a gas pipeline, and the other end of the air pump is connected to the inlet of the refrigerator;

[0011] The step of opening the first solenoid valve and the second solenoid valve when the temperature sensor detects that the absolute value of the temperature difference between the battery temperature and the first preset temperature is between the first preset value and the second preset value, and adjusting the power of the circulation pump and the temperature adjustment power of the temperature adjustment device in real time according to the temperature difference until the absolute value of the temperature difference is less than the first preset value, comprises:

[0012] When the temperature sensor detects that the battery temperature is lower than the first preset temperature, and the absolute value of the temperature difference is greater than the first preset value and less than the second preset value, the first solenoid valve and the second solenoid valve are opened, and the power of the circulation pump and the heating power of the heating element are adjusted in real time according to the temperature difference to heat the liquid medium in the liquid storage tank until the absolute value of the temperature difference is less than the first preset value;

[0013] When the temperature sensor detects that the battery temperature is higher than the first preset temperature, and the absolute value of the temperature difference is greater than the first preset value and less than the second preset value, the first solenoid valve and the second solenoid valve are opened, the heating element is closed, and the refrigeration power of the refrigerator is adjusted in real time according to the temperature difference, and the liquid medium in the heat exchanger is cooled by the refrigerant gas of the refrigerator until the absolute value of the temperature difference is less than the first preset value.

[0014] According to some embodiments of the present invention, a smoke sensor is provided in the battery box, the first solenoid valve is a three-way solenoid valve, the first outlet of the first solenoid valve is connected to the interior of the battery box, the second outlet of the first solenoid valve is connected to one end of a branch pipe, and the other end of the branch pipe is connected to an atomizing nozzle; the atomizing nozzle is provided in the battery box; the method further comprises the following steps:

[0015] When the smoke sensor detects a smoke signal, the second outlet of the first solenoid valve is opened so that the liquid storage tank is connected to the branch pipeline;

[0016] The circulation pump is started to pump the liquid medium in the liquid storage tank into the branch pipeline. The atomizing nozzle atomizes the liquid medium and then sprays it on the battery surface in the battery box to cool the battery.

[0017] According to some embodiments of the present invention, a first liquid level sensor is provided at the bottom of the battery box, and a second liquid level sensor is provided below the ventilation port;

[0018] When the absolute value of the temperature difference between the battery temperature and the first preset temperature is between the second preset value and the third preset value, the first solenoid valve is closed, the second solenoid valve and the third solenoid valve are opened, and the circulating pump draws the liquid medium in the battery box to the liquid storage tank; after the temperature regulating device adjusts the liquid medium to the second preset temperature, the second solenoid valve is closed, the first solenoid valve and the third solenoid valve are opened, and the circulating pump draws the liquid medium in the liquid storage tank to the battery box; the step of the third preset value being greater than the second preset value comprises:

[0019] When the temperature sensor detects that the absolute value of the temperature difference between the battery temperature and the first preset temperature is greater than a second preset value and less than a third preset value, the first solenoid valve is closed, the second solenoid valve and the third solenoid valve are opened, and the circulation pump draws the liquid medium in the battery box into the liquid storage tank until the first liquid level sensor detects that the liquid medium has been drained, and the circulation pump stops working;

[0020] After the temperature control device adjusts the liquid medium in the liquid storage tank to a second preset temperature, the second solenoid valve is closed, and the first solenoid valve and the third solenoid valve are opened. The circulation pump draws the liquid medium in the liquid storage tank into the battery box until the second liquid level sensor detects that the height of the liquid medium in the battery box reaches a preset height, and then the first solenoid valve and the third solenoid valve are closed.

[0021] In a second aspect, a thermal management control method according to an embodiment of the present invention is applied to an immersed energy storage battery system, the immersed energy storage battery system comprising: a plurality of battery boxes, liquid storage tanks, circulating pumps, temperature regulating devices and control devices connected in series in sequence, the liquid inlet of the first battery box is connected to the liquid outlet of the liquid storage tank through a liquid inlet pipe, the liquid outlet of the last battery box is connected to one end of the circulating pump through a liquid discharge pipe, and the other end of the circulating pump is connected to the liquid inlet of the liquid storage tank; a first solenoid valve is provided at the liquid inlet of each battery box, and a second solenoid valve is provided at the liquid outlet of each battery box; a temperature sensor for detecting the battery temperature is provided in the battery box; the battery box is also provided with a ventilation port, the ventilation port is connected to the liquid storage tank through an air pipe, and a third solenoid valve is provided at the ventilation port; the first solenoid valve, the second solenoid valve, the third solenoid valve, the temperature sensor, the circulating pump and the temperature regulating device are all electrically connected to the control device; a liquid medium is stored in the liquid storage tank, and the temperature regulating device is used to adjust the temperature of the liquid medium; the method comprises the following steps:

[0022] The circulation pump draws the liquid medium from the liquid storage tank into the battery box until the height of the liquid medium in the battery box reaches a preset height;

[0023] When the absolute value of the temperature difference between the temperature detected by the temperature sensor and the first preset temperature is greater than the first preset value and less than the second preset value, the control device opens the first solenoid valve and the second solenoid valve of all the battery boxes, and adjusts the power of the circulation pump and the temperature control power of the temperature control device in real time according to the temperature difference, until the absolute value of the temperature difference is less than the first preset value; the second preset value is greater than the first preset value;

[0024] When the absolute value of the temperature difference between the temperature detected by the temperature sensor and the first preset temperature is greater than the second preset value and less than the third preset value, the control device closes the first solenoid valve of the battery box corresponding to the temperature sensor, opens the second solenoid valve and the third solenoid valve of the battery box, and the first solenoid valve and the second solenoid valve of all subsequent battery boxes, and the circulating pump draws the liquid medium in the battery box to the liquid storage tank, and closes the second solenoid valve of the battery box and the first solenoid valve and the second solenoid valve of all subsequent battery boxes; after the temperature control device adjusts the liquid medium in the liquid storage tank to the second preset temperature, the control device opens the first solenoid valve and the third solenoid valve of the battery box, and the first solenoid valve and the second solenoid valve of all battery boxes before the battery box, and the circulating pump draws the liquid medium in the liquid storage tank to the battery box until the height of the liquid medium in the battery box reaches the preset height; the third preset value is greater than the second preset value.

[0025] According to some embodiments of the present invention, each of the battery boxes is further provided with a spare liquid inlet and a spare liquid outlet, a fourth solenoid valve is provided at the spare liquid inlet, a fifth solenoid valve is provided at the spare liquid outlet, the spare liquid inlet is communicated with a spare liquid storage tank, the spare liquid outlet is communicated with one end of a spare circulation pump, a three-way solenoid valve is provided at the other end of the spare circulation pump, a first outlet of the three-way solenoid valve is communicated with the spare liquid storage tank, a second outlet of the three-way solenoid valve is communicated with a waste liquid tank, the fourth solenoid valve, the fifth solenoid valve and the three-way solenoid valve are all electrically connected to the control device, a refrigerant is provided in the spare liquid storage tank, and the temperature of the refrigerant is lower than that of the liquid medium; the method further includes:

[0026] When the temperature detected by the temperature sensor is greater than the third preset value, there is a thermal runaway battery in the battery box, and the control device closes the first solenoid valve and the second solenoid valve of all the battery boxes, opens the fourth solenoid valve and the fifth solenoid valve of the battery box with the thermal runaway battery, and opens the second outlet of the three-way solenoid valve;

[0027] After the backup circulation pump draws the liquid medium of the battery box into the waste liquid tank, the control device closes the second outlet of the three-way solenoid valve and opens the first outlet of the three-way solenoid valve, and the backup circulation pump pumps the refrigerant in the backup liquid storage tank into the battery box until the battery temperature of the battery box is lower than the third preset value.

[0028] According to some embodiments of the present invention, a heat exchanger is provided between the liquid storage tank and the first battery box, a heat-conducting coil is provided in the heat exchanger, a liquid inlet of the first battery box is connected to a liquid outlet of the liquid storage tank after passing through the heat exchanger via a liquid inlet pipe, and the heat exchanger is provided with an air inlet and an air outlet; the temperature control device comprises a heating element and a refrigerator, the heating element is provided in the liquid storage tank, the outlet of the refrigerator is connected to one end of the heat-conducting coil via a gas pipeline, the other end of the heat-conducting coil is connected to one end of an air pump via a gas pipeline, and the other end of the air pump is connected to the inlet of the refrigerator;

[0029] The step of the control device opening the first solenoid valve and the second solenoid valve of all the battery boxes and adjusting the power of the circulation pump and the temperature regulating power of the temperature regulating device in real time according to the temperature difference, until the absolute value of the temperature difference is less than the first preset value, when the absolute value of the temperature difference between the temperature detected by the temperature sensor and the first preset temperature is greater than the first preset value and less than the second preset value, comprises:

[0030] When the temperature detected by the temperature sensor is lower than the first preset temperature, and the absolute value of the temperature difference is greater than the first preset value and less than the second preset value, the control device opens the first solenoid valve and the second solenoid valve of all the battery boxes, and adjusts the power of the circulation pump and the heating power of the heating element in real time according to the temperature difference until the absolute value of the temperature difference is less than the first preset value;

[0031] When the temperature detected by the temperature sensor is higher than the first preset temperature, and the absolute value of the temperature difference is greater than the first preset value and less than the second preset value, the control device opens the first solenoid valve and the second solenoid valve of all the battery boxes, turns off the heating element, and adjusts the power of the circulation pump and the refrigeration power of the refrigerator in real time according to the temperature difference, and cools the liquid medium in the heat exchanger by the refrigerant gas of the refrigerator until the absolute value of the temperature difference is less than the first preset value.

[0032] According to some embodiments of the present invention, a smoke sensor is provided in the battery box, the first solenoid valve is a three-way solenoid valve, the first outlet of the first solenoid valve is connected to the interior of the battery box, the second outlet of the first solenoid valve is connected to one end of a branch pipe, and the other end of the branch pipe is connected to an atomizing nozzle; the atomizing nozzle is provided in the battery box, and the smoke sensor and the atomizing nozzle are both electrically connected to the control device; the method further comprises the following steps:

[0033] When the smoke sensor detects a smoke signal, the second outlet of the first solenoid valve is opened so that the liquid storage tank is connected to the branch pipeline;

[0034] The circulation pump is started to pump the liquid medium in the liquid storage tank into the branch pipeline. The atomizing nozzle atomizes the liquid medium and then sprays it on the battery surface in the battery box to cool the battery core.

[0035] In the third aspect, a thermal management control device according to an embodiment of the present invention includes at least one control processor and a memory for communicating with the at least one control processor; the memory stores instructions that can be executed by the at least one control processor, and the instructions are executed by the at least one control processor so that the at least one control processor can execute the thermal management control method described in the first or second aspect embodiments above.

[0036] The thermal management control method, device, and electronic device according to the embodiments of the present invention have at least the following beneficial effects: the battery box can exchange air with the liquid storage tank to prevent the liquid medium from evaporating gas to the outside, and through the exchange of gas between the boxes, the liquid volume in the box can be flexibly controlled between full and empty. When the liquid temperature is high, all the liquid can be drained and then new low-temperature liquid can be injected, which not only improves the efficiency of liquid replacement and cooling, but also improves the uniformity of temperature control. In addition, the ventilation operation prevents the thermal expansion of the liquid from causing great pressure on the battery box. Different temperature control methods are set according to different temperature conditions, and the power of the circulating pump 300 and the temperature control device can be adjusted in real time to achieve better temperature control effects.

[0037] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0039] Figure 1 A flow chart of the steps of a thermal management control method according to an embodiment of the present invention;

[0040] Figure 2 A schematic structural diagram of an immersion energy storage battery system according to an embodiment of the present invention;

[0041] Figure 3 A flow chart of the steps of a thermal management control method according to another embodiment of the present invention;

[0042] Figure 4 It is a structural schematic diagram of an immersion energy storage battery system according to another embodiment of the present invention. DETAILED DESCRIPTION

[0043] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and are not to be construed as limitations on the present application. For the step numbers in the following embodiments, they are only provided for the convenience of explanation, and the order between the steps is not limited in any way, and the execution order of each step in the embodiment can be adaptively adjusted according to the understanding of those skilled in the art.

[0044] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0045] The terms "first", "second", "third" and "fourth" etc. in the specification and claims of the present invention and the drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0046] Reference to "embodiments" in the present invention means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0047] The battery is immersed in a liquid medium in the immersion energy storage battery box, and the temperature and temperature difference are controlled by circulating the liquid medium. In practical applications, the fluidity and uniformity of the liquid medium are affected due to viscous resistance and friction with the battery cell or the box wall, resulting in poor temperature control and significantly reduced efficiency after long-term operation. The traditional solution is to use larger-diameter pipes or higher pressures to accelerate the circulation of liquids and shorten the maintenance cycle of equipment, but this will increase system costs and reduce available time.

[0048] To this end, the embodiments of the present invention propose a thermal management control method, device, and electronic device. The battery box can exchange air with the liquid storage tank to prevent the liquid medium from evaporating gas to the outside, and through the exchange of gas between the boxes, the liquid volume in the box can be flexibly controlled between full and empty. When the liquid temperature is high, all the liquid can be drained and then new low-temperature liquid can be injected, which not only improves the efficiency of liquid replacement and cooling, but also improves the uniformity of temperature control. In addition, the ventilation operation prevents the thermal expansion of the liquid from causing great pressure on the battery box. Different temperature control methods are set according to different temperature conditions, and the power of the circulating pump and the temperature control device can be adjusted in real time to achieve better temperature control effects.

[0049] On the one hand, an embodiment of the present invention provides a thermal management control method, which is applied to a parallel submerged energy storage battery system, such as Figure 2 As shown, the submerged energy storage battery system includes: a plurality of battery boxes 100, a liquid storage tank 200, a circulation pump 300, a temperature regulating device (not shown) and a control device (not shown). The liquid inlet of each battery box 100 is connected to the liquid outlet of the liquid storage tank 200 through a liquid inlet pipe, and the liquid outlet of each battery box 100 is connected to one end of the circulation pump 300 through a liquid discharge pipe, and the other end of the circulation pump 300 is connected to the liquid inlet of the liquid storage tank 200; a first A solenoid valve 600, a second solenoid valve 700 is provided at the liquid outlet of each battery box 100; a temperature sensor for detecting the battery temperature is provided in the battery box 100; the battery box 100 is also provided with a ventilation port 110, and the ventilation port 110 is connected to the liquid storage tank 200 through an air pipe, and a third solenoid valve 800 is provided at the ventilation port 110; the first solenoid valve 600, the second solenoid valve 700, the third solenoid valve 800, the temperature sensor, the circulating pump 300 and the temperature control device are all electrically connected to the control device. Among them, the liquid storage tank 200 stores liquid medium, and the temperature control device is used to adjust the temperature of the liquid medium; the control device is used to control the switching state of each solenoid valve, as well as control the power of the circulating pump 300 and the temperature control power of the temperature control device, and the control device is also used to receive signals detected by the temperature sensor. Figure 2 It can be seen that in this example, several battery boxes 100 are in parallel connection, that is, each battery box 100 is connected to the liquid storage tank 100 and the circulation pump 300 respectively.

[0050] like Figure 1 As shown, the thermal management control method of the embodiment of the present invention includes the following steps:

[0051] Step S100: The circulation pump 300 draws liquid medium from the liquid storage tank 200 into the battery box;

[0052] Specifically, before the liquid medium is extracted from the liquid storage tank 200 by the circulation pump 300, the control device opens the first solenoid valve 600 of each battery box 100, so that the liquid inlet of the battery box 100 is connected to the liquid outlet of the liquid storage tank 200, so that the circulation pump 300 can pump the liquid medium in the liquid storage tank 200 into the battery box 100, so that the liquid medium cools down the batteries in the battery box 100. At the same time, the third solenoid valve 800 can be opened to connect the ventilation port 110 of each battery box 100 with the liquid storage tank 200, so that the battery box 100 can exchange air with the liquid storage tank 200 and avoid the liquid medium from evaporating gas to the outside. Through the exchange of gas between the boxes, the liquid volume in the box can be flexibly controlled between full and empty; in addition, through the ventilation operation, the liquid medium in the battery box 100 is prevented from thermally expanding and causing great pressure on the battery box 100, thereby damaging the battery.

[0053] Step S200: when the temperature sensor detects that the absolute value of the temperature difference between the battery temperature and the first preset temperature is between the first preset value and the second preset value, the first solenoid valve 600 and the second solenoid valve 700 are opened, and the power of the circulation pump 300 and the temperature control power of the temperature control device are adjusted in real time according to the temperature difference, until the absolute value of the temperature difference is less than the first preset value; and the second preset value is greater than the first preset value;

[0054] Specifically, when the battery temperature in the battery box 100 is within the normal range and the temperature difference with the first preset temperature is less than the set first preset value, the liquid medium does not flow. At this time, the first solenoid valve 600 and the second solenoid valve 700 are both closed, and the circulating pump 300 does not need to work, thereby saving power.

[0055] When the battery temperature in the battery box 100 is slightly higher than the upper limit of the normal range or slightly lower than the lower limit of the normal range, that is, the absolute value of the temperature difference with the first preset temperature is greater than the first preset value and less than the second preset value, the first solenoid valve 600 and the second solenoid valve 700 of the battery box 100 are opened, so that the liquid inlet and the liquid outlet of the battery box 100 are connected to the liquid storage tank 200 and the circulation pump 300 respectively. At this time, the circulation pump 300 can drive the liquid medium in the battery box 100 and the liquid storage tank 200 to circulate; at the same time, the temperature control device will adjust the temperature of the liquid medium, so that the temperature of the liquid medium increases or decreases, and then the temperature of the battery box 100 increases or decreases, so that the temperature of the battery returns to the normal range to avoid damaging the battery. At the same time, in the process of adjusting the temperature, the control device will dynamically adjust the power of the circulation pump and the temperature control power of the temperature control device according to the real-time temperature difference between the real-time temperature of the battery box 100 and the first preset value. When the real-time temperature difference is large, the power of the circulation pump and the temperature control power of the temperature control device will be increased. When the real-time temperature difference is small, the power of the circulation pump and the temperature control power of the temperature control device will be reduced, thereby saving power consumption and improving the adjustment accuracy.

[0056] Step S300: When the absolute value of the temperature difference between the battery temperature and the first preset temperature is between the second preset value and the third preset value, the first solenoid valve 600 is closed, the second solenoid valve 700 and the third solenoid valve 800 are opened, and the circulating pump 300 draws the liquid medium in the battery box 100 to the liquid storage tank 200. After the temperature control device adjusts the liquid medium to the second preset temperature, the second solenoid valve 700 is closed, the first solenoid valve 600 and the third solenoid valve 800 are opened, and the circulating pump 300 draws the liquid medium in the liquid storage tank 200 to the battery box 100; the third preset value is greater than the second preset value.

[0057] Specifically, when the temperature of the battery in the battery box 100 is significantly higher than the upper limit of the normal range or lower than the lower limit of the normal range, that is, the absolute value of the temperature difference with the first preset temperature is greater than the second preset value and less than the third preset value, the first solenoid valve 600 at the liquid inlet of the battery box 100 is closed, and the second solenoid valve 700 at the liquid outlet and the third solenoid valve 800 at the ventilation port 110 are opened, so that the circulating pump 300 can pump all the liquid medium in the battery box 100 to the liquid storage tank 200, and then the liquid medium in the liquid storage tank 200 is cooled or heated by the temperature control device, and finally the second solenoid valve 700 at the liquid outlet is closed, and the first solenoid valve 600 at the liquid inlet and the third solenoid valve 800 at the ventilation port 110 are opened, and the battery box 100 is filled with liquid medium that meets the temperature requirements, so that the temperature of the battery box 100 returns to the normal range.

[0058] Furthermore, in some embodiments of the present invention, the thermal management control method further includes the following steps:

[0059] Step S400: When the temperature sensor detects that the battery temperature is greater than the third preset value, there is a thermal runaway battery in the battery box 100, and the control device opens the first solenoid valve 600, the second solenoid valve 700 and the third solenoid valve 800 of the battery box 100, and closes the first solenoid valve 600, the second solenoid valve 700 and the third solenoid valve 800 of other battery boxes 100, so that the circulating pump 300 runs at maximum power and the temperature control device cools down at maximum power.

[0060] Specifically, when the battery becomes significantly overheated due to thermal runaway, the temperature detected by the temperature sensor is greater than a third preset value, and the control device opens the first solenoid valve 600, the second solenoid valve 700 and the third solenoid valve 800 of the battery box 100 containing the thermal runaway battery, and closes the first solenoid valve 600, the second solenoid valve 700 and the third solenoid valve 800 of other battery boxes 100. While keeping the liquid medium in the battery box 100 not completely empty, the circulating pump 300 operates at maximum power, and at the same time the temperature control device cools down at maximum power, so that the thermal runaway battery is cooled as quickly as possible to avoid damage to the battery box 100 and other batteries.

[0061] Further, in some embodiments of the present invention, a heat exchanger (not shown) is provided between the liquid storage tank 200 and the battery box 100, a heat conduction coil is provided in the heat exchanger, and the liquid inlet of each battery box 100 is connected to the liquid outlet of the liquid storage tank 200 through the liquid inlet pipe and the heat exchanger; the temperature control device includes a heating element and a refrigerator, the heating element is provided in the liquid storage tank 200, the outlet of the refrigerator is connected to one end of the heat conduction coil through a gas pipeline, the other end of the heat conduction coil is connected to one end of the air pump through the gas pipeline, and the other end of the air pump is connected to the inlet of the refrigerator; in this example, the above step S200 specifically includes the following two steps:

[0062] (1) When the temperature detected by the temperature sensor is lower than the first preset temperature, and the absolute value of the temperature difference is greater than the first preset value and less than the second preset value, the control device opens the first solenoid valve 600 and the second solenoid valve 700, and adjusts the power of the circulation pump and the heating power of the heating element in real time according to the temperature difference, and heats the liquid medium in the liquid storage tank until the absolute value of the temperature difference is less than the first preset value;

[0063] (2) When the temperature detected by the temperature sensor is higher than the first preset temperature, and the absolute value of the temperature difference is greater than the first preset value and less than the second preset value, the control device opens the first solenoid valve 600 and the second solenoid valve 700, turns off the heating element, and adjusts the refrigeration power of the refrigerator in real time according to the temperature difference, and cools the liquid medium in the heat exchanger by the refrigerant gas of the refrigerator until the absolute value of the temperature difference is less than the first preset value.

[0064] Specifically, too high or too low temperature will affect the normal operation of the battery. When the temperature of the battery is too low, lower than the first preset temperature, and the absolute value of the temperature difference with the first preset temperature is greater than the first preset value, at this time, the control device opens the first solenoid valve 600 and the second solenoid valve 700 of the battery box 100, so that the liquid inlet and the liquid outlet of the battery box 100 are connected to the liquid storage tank 200 and the circulation pump 300 respectively. At this time, the circulation pump 300 can drive the liquid medium in the battery box 100 and the liquid storage tank 200 to circulate; at the same time, the heating element will heat the liquid medium in the liquid storage tank 200, so that the temperature of the liquid medium increases, and then the temperature of the battery box 100 increases, so that the temperature of the battery returns to the normal range to avoid damaging the battery. When the temperature of the battery is too high, higher than the first preset temperature, and the absolute value of the temperature difference with the first preset temperature is greater than the first preset value, at this time, the control device opens the first solenoid valve 600 and the second solenoid valve 700 of the battery box 100, so that the liquid inlet and the liquid outlet of the battery box 100 are connected to the heat exchanger and the circulation pump 300 respectively. At this time, the circulation pump 300 can drive the liquid medium in the battery box 100, the heat exchanger and the liquid storage tank 200 to circulate; at the same time, the refrigerator will produce refrigerant gas, and when the refrigerant gas passes through the heat conduction coil, the liquid medium in the heat exchanger is cooled down, and then the refrigerant gas returns to the refrigerator through the air pump for continued use. Through the refrigeration operation of the refrigerator, the temperature of the liquid medium in the heat exchanger is reduced, and then when the liquid medium in the heat exchanger passes through the battery box 100, the battery box 100 is cooled down, so that the temperature of the battery is restored to the normal range to avoid damage to the battery. At the same time, during the temperature adjustment process, the control device will dynamically adjust the power of the circulation pump, the heating power of the heating element and the cooling power of the refrigerator according to the real-time temperature difference between the battery box 100 and the first preset value, thereby improving the adjustment accuracy.

[0065] Furthermore, in some embodiments of the present invention, a smoke sensor is provided in the battery box 100, the first solenoid valve 600 is a three-way solenoid valve, the first outlet of the first solenoid valve 600 is connected to the interior of the battery box 100, the first outlet of the first solenoid valve 600 is connected to the interior of the battery box 100, the second outlet of the first solenoid valve 600 is connected to one end of the branch pipe, and the other end of the branch pipe is connected to the atomizing nozzle; the atomizing nozzle is provided in the battery box 100, and the smoke sensor and the atomizing nozzle are both electrically connected to the control device. The thermal management control method of the embodiment of the present invention also includes the following two steps:

[0066] (1) When the smoke sensor detects a smoke signal, the control device opens the second outlet of the first solenoid valve 600 so that the liquid storage tank 200 is connected to the branch pipeline;

[0067] (2) The circulation pump is started to pump the liquid medium in the liquid storage tank 200 into the branch pipe. The liquid medium is atomized by the atomizing nozzle and then sprayed onto the surface of the battery in the battery box 100 to cool the battery.

[0068] Specifically, when the temperature of the battery is too high and smoke is generated, there may be a risk of battery combustion. At this time, if the battery surface is cooled only by a liquid medium, the cooling efficiency is not high enough to effectively suppress the risk of combustion. However, by atomizing the liquid medium through an atomizing nozzle and spraying it on the battery, the battery can be cooled quickly, the smoke can be eliminated, and the risk of combustion can be suppressed.

[0069] Further, in some embodiments of the present invention, a first liquid level sensor is provided at the bottom of the battery box 100, and a second liquid level sensor is provided below the ventilation port 110, and the first liquid level sensor and the second liquid level sensor are electrically connected to the control device respectively; in this example, the above step S300 specifically includes the following two steps:

[0070] (1) When the absolute value of the temperature difference between the temperature detected by the temperature sensor and the first preset temperature is greater than the second preset value and less than the third preset value, the control device closes the first solenoid valve 600, opens the second solenoid valve 700 and the third solenoid valve 800, and the circulation pump 300 pumps the liquid medium in the battery box 100 into the liquid storage tank 200 until the first liquid level sensor detects that the liquid medium has been drained, and the circulation pump 300 stops working;

[0071] (2) After the temperature control device adjusts the liquid medium in the liquid storage tank 200 to the second preset temperature, the control device closes the second solenoid valve 700, opens the first solenoid valve 600 and the third solenoid valve 800, and the circulation pump 300 pumps the liquid medium in the liquid storage tank 200 into the battery box 100 until the second liquid level sensor detects that the height of the liquid medium in the battery box 100 reaches the preset height, and then closes the first solenoid valve 600 and the third solenoid valve 800.

[0072] By providing the first liquid level sensor and the second liquid level sensor, the height of the liquid medium in the battery box 100 can be detected, thereby determining whether the liquid medium in the battery box 100 is drained or reaches a preset height. When the temperature of the battery in the battery box 100 is significantly higher than the upper limit of the normal range or lower than the lower limit of the normal range, and the absolute value of the temperature difference with the first preset temperature is greater than the second preset value and less than the third preset value, the first solenoid valve 600 at the liquid inlet of the battery box 100 is closed, and the second solenoid valve 700 at the liquid outlet and the third solenoid valve 800 at the ventilation port 110 are opened, so that the circulating pump 300 can pump all the liquid medium in the battery box 100 to the liquid storage tank 200, and then the liquid medium in the liquid storage tank 200 is cooled or heated by the temperature control device, and finally the second solenoid valve 700 at the liquid outlet is closed, and the first solenoid valve 600 at the liquid inlet and the third solenoid valve 800 at the ventilation port 110 are opened to fill the battery box 100 with liquid medium that meets the temperature requirements, so that the temperature of the battery box 100 returns to the normal range.

[0073] Furthermore, in some embodiments of the present invention, a pressure sensor is also provided inside the battery box 100 for detecting the air pressure inside the battery box 100. When the temperature inside the battery box 100 is too high and the air pressure is too high, the third solenoid valve 800 at the ventilation port 110 can be opened to connect the battery box 100 with the liquid storage tank 200, thereby relieving the pressure in the battery box 100 and preventing the battery box 100 from being damaged due to excessive air pressure.

[0074] According to the thermal management control method of the embodiment of the present invention, the battery box 100 can exchange air with the liquid storage tank 200 to prevent the liquid medium from evaporating gas to the outside, and through the exchange of gas between the boxes, the liquid volume in the box can be flexibly controlled between full and empty. When the liquid temperature is high, the liquid can be completely discharged and then new low-temperature liquid can be injected, which not only improves the efficiency of liquid replacement and cooling, but also improves the uniformity of temperature control. In addition, the ventilation operation prevents the thermal expansion of the liquid from causing great pressure on the battery box 100. The battery box 100 is connected in parallel, which has a better temperature control effect on a single battery box 100, and under thermal runaway conditions, it can be quickly replaced to achieve a rapid cooling effect. Different temperature control methods are set according to different temperature conditions, and the power of the circulating pump 300 and the temperature control device can be adjusted in real time to achieve a better temperature control effect.

[0075] On the other hand, the embodiment of the present invention also provides another thermal management control method, which is applied to a series-connected immersed energy storage battery system, such as Figure 4As shown, the submerged energy storage battery system includes: a plurality of battery boxes 100, a liquid storage tank 200, a circulation pump 300, a temperature regulating device (not shown) and a control device (not shown). The plurality of battery boxes 100 are connected in series in sequence. The liquid inlet of the first battery box 100 is connected to the liquid outlet of the liquid storage tank 200 through a liquid inlet pipe, and the liquid outlet of the last battery box 100 is connected to one end of the circulation pump 300 through a liquid discharge pipe, and the other end of the circulation pump 300 is connected to the liquid inlet of the liquid storage tank 200; a first solenoid valve 600 is provided at the liquid inlet of each battery box 100, and each electric A second solenoid valve 700 is provided at the liquid outlet of the battery box 100; a temperature sensor for detecting the battery temperature is provided in the battery box 100; the battery box 100 is also provided with a ventilation port 110, which is connected to the liquid storage tank 200 through an air pipe, and a third solenoid valve 800 is provided at the ventilation port 110; the first solenoid valve 600, the second solenoid valve 700, the third solenoid valve 800, the temperature sensor, the circulation pump 300 and the temperature control device are all electrically connected to the control device; the liquid storage tank 200 stores liquid medium, and the temperature control device is used to adjust the temperature of the liquid medium. Figure 3 As shown, the thermal management control method of the embodiment of the present invention includes the following steps:

[0076] Step S500: the circulation pump 300 draws liquid medium from the liquid storage tank 200 into the battery box 100 until the height of the liquid medium in the battery box 100 reaches a preset height;

[0077] Specifically, before the liquid medium is extracted from the liquid storage tank 200 by the circulation pump 300, the control device opens the first solenoid valve 600 and the second solenoid valve 700 of each battery box 100, and closes the second solenoid valve 700 of the last battery box 100, so that the liquid inlets of all battery boxes 100 are connected to the liquid outlet of the liquid storage tank 200, so that the circulation pump 300 can pump the liquid medium in the liquid storage tank 200 into the battery box 100, so that the liquid medium cools down the batteries in the battery box 100. At the same time, the third solenoid valve 800 of each battery box 100 can be opened, so that the ventilation port 110 of each battery box 100 is connected to the liquid storage tank 200, so that the battery box 100 can exchange air with the liquid storage tank 200, and avoid the liquid medium from volatilizing gas to the outside. Through the ventilation operation, the liquid medium in the battery box 100 is prevented from thermally expanding and causing great pressure on the battery box 100, thereby damaging the battery.

[0078] Step S600: When the absolute value of the temperature difference between the temperature detected by the temperature sensor and the first preset temperature is greater than the first preset value and less than the second preset value, the control device opens the first solenoid valve 600 and the second solenoid valve 700 of all battery boxes 100, and adjusts the power of the circulation pump 300 and the temperature control power of the temperature control device in real time according to the temperature difference, until the absolute value of the temperature difference is less than the first preset value; the second preset value is greater than the first preset value;

[0079] Specifically, when the battery temperature in the battery box 100 is within the normal range and the temperature difference with the first preset temperature is less than the set first preset value, the liquid medium does not flow. At this time, the first solenoid valve 600 and the second solenoid valve 700 are both closed, and the circulating pump 300 does not need to work, thereby saving power.

[0080] When the battery temperature in the battery box 100 is slightly higher than the upper limit of the normal range or slightly lower than the lower limit of the normal range, that is, the absolute value of the temperature difference with the first preset temperature is greater than the first preset value and less than the second preset value, the first solenoid valve 600 and the second solenoid valve 700 of all battery boxes 100 are opened, so that the liquid inlet and the liquid outlet of the battery box 100 are connected to the liquid storage tank 200 and the circulation pump 300 respectively. At this time, the circulation pump 300 can drive the liquid medium in the battery box 100 and the liquid storage tank 200 to circulate; at the same time, the temperature control device will adjust the temperature of the liquid medium, so that the temperature of the liquid medium increases or decreases, and then the temperature of the battery box 100 increases or decreases, so that the temperature of the battery returns to the normal range to avoid damaging the battery. At the same time, in the process of adjusting the temperature, the control device will dynamically adjust the power of the circulation pump and the temperature control power of the temperature control device according to the real-time temperature difference between the real-time temperature of the battery box 100 and the first preset value. When the real-time temperature difference is large, the power of the circulation pump and the temperature control power of the temperature control device will be increased. When the real-time temperature difference is small, the power of the circulation pump and the temperature control power of the temperature control device will be reduced, thereby saving power consumption and improving the adjustment accuracy.

[0081] Step S700: When the absolute value of the temperature difference between the temperature detected by the temperature sensor and the first preset temperature is greater than the second preset value and less than the third preset value, the control device closes the first solenoid valve 600 of the battery box 100 corresponding to the temperature sensor, opens the second solenoid valve 700 and the third solenoid valve 800 of the battery box 100, and the first solenoid valve 600 and the second solenoid valve 700 of all subsequent battery boxes 100, and the circulating pump 300 extracts the liquid medium in the battery box 100 to the liquid storage tank 200, and closes the second solenoid valve 700 of the battery box 100 and the subsequent solenoid valves 800. The first solenoid valve 600 and the second solenoid valve 700 of all battery boxes 100; after the temperature control device adjusts the liquid medium in the liquid storage tank 200 to the second preset temperature, the control device opens the first solenoid valve 600 and the third solenoid valve 800 of the battery box 100, as well as the first solenoid valve 600 and the second solenoid valve 700 of all battery boxes 100 before the battery box 100, and the circulating pump 300 draws the liquid medium in the liquid storage tank 200 to the battery box 100 until the height of the liquid medium in the battery box 100 reaches the preset height; the third preset value is greater than the second preset value.

[0082] Specifically, when the temperature of the batteries in the battery box 100 is significantly higher than the upper limit of the normal range or lower than the lower limit of the normal range, that is, the absolute value of the temperature difference with the first preset temperature is greater than the second preset value and less than the third preset value, the first solenoid valve 600 at the liquid inlet of the battery box 100 is closed, and the second solenoid valve 700 at the liquid outlet and the third solenoid valve 800 at the ventilation port 110 are opened, and the first solenoid valve 600 and the second solenoid valve 700 of all subsequent battery boxes 100 of the battery box 100 are opened, so that the circulating pump 300 can extract the liquid medium in the battery box 100, and the second solenoid valve 700 of the battery box 100 and the first solenoid valve 600 and the second solenoid valve 700 of all subsequent battery boxes 100 are closed. Then, the liquid medium in the liquid storage tank 200 is cooled or heated by the temperature control device, and the control device then opens the first solenoid valve 600 and the third solenoid valve 800 of the battery box 100, as well as the first solenoid valve 600 and the second solenoid valve 700 of all battery boxes 100 before the battery box 100, and the circulating pump 300 draws the liquid medium in the liquid storage tank 200 into the battery box 100 until the height of the liquid medium in the battery box 100 reaches a preset height, so that the temperature of the battery box 100 returns to a normal range.

[0083] Furthermore, in some embodiments of the present invention, each battery box 100 is also provided with a spare liquid inlet and a spare liquid outlet, a fourth solenoid valve is provided at the spare liquid inlet, a fifth solenoid valve is provided at the spare liquid outlet, the spare liquid inlet is connected to a spare liquid storage tank, the spare liquid outlet is connected to one end of a spare circulation pump, a three-way solenoid valve is provided at the other end of the spare circulation pump, a first outlet of the three-way solenoid valve is connected to the spare liquid storage tank, a second outlet of the three-way solenoid valve is connected to a waste liquid tank, the fourth solenoid valve, the fifth solenoid valve and the three-way solenoid valve are all electrically connected to the control device, a refrigerant is provided in the spare liquid storage tank, and the temperature of the refrigerant is lower than that of the liquid medium. The thermal management control method of the embodiment of the present invention also includes:

[0084] When the temperature detected by the temperature sensor is greater than the third preset value, there is a thermal runaway battery in the battery box 100, and the control device closes the first solenoid valve 600 and the second solenoid valve 700 of all battery boxes 100, opens the fourth solenoid valve and the fifth solenoid valve of the battery box 100 where the thermal runaway battery exists, and opens the second outlet of the three-way solenoid valve;

[0085] After the backup circulation pump draws the liquid medium of the battery box 100 into the waste liquid tank, the control device closes the second outlet of the three-way solenoid valve and opens the first outlet of the three-way solenoid valve. The circulation pump pumps the refrigerant in the backup liquid storage tank into the battery box 100 until the battery temperature of the battery box 100 is lower than the third preset value.

[0086] Specifically, when the battery has a significantly high temperature due to thermal runaway, the first solenoid valve 600 and the second solenoid valve 700 of all battery boxes 100 are closed to avoid affecting the batteries of other battery boxes 100. At the same time, the fourth solenoid valve and the fifth solenoid valve of the battery box 100 with the thermal runaway battery are opened, and the second outlet of the three-way solenoid valve is opened, so that the backup circulation pump discharges the liquid medium of the battery box 100 into the waste liquid tank, and then the second outlet of the three-way solenoid valve is closed, and the first outlet of the three-way solenoid valve is opened, so that the backup circulation pump pumps the refrigerant in the backup liquid storage tank into the battery box 100 until the battery temperature of the battery box 100 is lower than the third preset value.

[0087] Furthermore, in some embodiments of the present invention, a heat exchanger is provided between the liquid storage tank 200 and the first battery box 100, a heat-conducting coil is provided in the heat exchanger, the liquid inlet of the first battery box 100 is connected to the liquid outlet of the liquid storage tank 200 after passing through the heat exchanger via the liquid inlet pipe, and the heat exchanger is provided with an air inlet and an air outlet; the temperature control device includes a heating element and a refrigerator, the heating element is provided in the liquid storage tank, the outlet of the refrigerator is connected to one end of the heat-conducting coil through a gas pipeline, the other end of the heat-conducting coil is connected to one end of the air pump through a gas pipeline, and the other end of the air pump is connected to the inlet of the refrigerator. The above-mentioned step S600 includes:

[0088] When the temperature detected by the temperature sensor is higher than the first preset temperature, and the absolute value of the temperature difference is greater than the first preset value and less than the second preset value, the control device opens the first solenoid valve 600 and the second solenoid valve 700 of all battery boxes 100, and adjusts the power of the circulation pump and the heating power of the heating element in real time according to the temperature difference until the absolute value of the temperature difference is less than the first preset value;

[0089] When the temperature detected by the temperature sensor is lower than the first preset temperature, and the absolute value of the temperature difference is greater than the first preset value and less than the second preset value, the control device opens the first solenoid valve 600 and the second solenoid valve 700 of all battery boxes 100, turns off the heating element, and adjusts the power of the circulating pump 300 and the refrigeration power of the refrigerator in real time according to the temperature difference, and cools the liquid medium in the heat exchanger by the refrigerant gas of the refrigerator until the absolute value of the temperature difference is less than the first preset value.

[0090] Specifically, too high or too low temperature will affect the normal operation of the battery. When the temperature of the battery is too low, lower than the first preset temperature, and the absolute value of the temperature difference with the first preset temperature is greater than the first preset value, at this time, the control device opens the first solenoid valve 600 and the second solenoid valve 700 of all the battery boxes 100, so that the liquid inlet and the liquid outlet of the battery box 100 are connected to the liquid storage tank 200 and the circulation pump 300 respectively. At this time, the circulation pump 300 can drive the liquid medium in the battery box 100 and the liquid storage tank 200 to circulate; at the same time, the heating element will heat the liquid medium in the liquid storage tank 200, so that the temperature of the liquid medium increases, and then the temperature of the battery box 100 increases, so that the temperature of the battery returns to the normal range to avoid damaging the battery. When the temperature of the battery is too high, higher than the first preset temperature, and the absolute value of the temperature difference with the first preset temperature is greater than the first preset value, at this time, the control device opens the first solenoid valve 600 and the second solenoid valve 700 of all battery boxes 100, so that the liquid inlet and the liquid outlet of the battery box 100 are connected to the heat exchanger and the circulation pump 300 respectively. At this time, the circulation pump 300 can drive the liquid medium in the battery box 100, the heat exchanger and the liquid storage tank 200 to circulate; at the same time, the refrigerator will produce refrigerant gas, and when the refrigerant gas passes through the heat conduction coil, the liquid medium in the heat exchanger is cooled down, and then the refrigerant gas is returned to the refrigerator through the air pump for continued use. Through the refrigeration operation of the refrigerator, the temperature of the liquid medium in the heat exchanger is reduced, and then when the liquid medium in the heat exchanger passes through the battery box 100, the battery box 100 is cooled down, so that the temperature of the battery is restored to the normal range to avoid damage to the battery. At the same time, during the temperature adjustment process, the control device will dynamically adjust the power of the circulation pump, the heating power of the heating element and the cooling power of the refrigerator according to the real-time temperature difference between the battery box 100 and the first preset value, thereby improving the adjustment accuracy.

[0091] Furthermore, in some embodiments of the present invention, a smoke sensor is provided in the battery box 100, the first solenoid valve 600 is a three-way solenoid valve, the first outlet of the first solenoid valve 600 is connected to the interior of the battery box 100, the second outlet of the first solenoid valve 600 is connected to one end of the branch pipe, and the other end of the branch pipe is connected to the atomizing nozzle; the atomizing nozzle is provided in the battery box 100, and the smoke sensor and the atomizing nozzle are both electrically connected to the control device. The thermal management control method of the embodiment of the present invention also includes the following steps:

[0092] When the smoke sensor detects a smoke signal, the second outlet of the first solenoid valve 600 is opened, so that the liquid storage tank 200 is connected to the branch pipeline;

[0093] The circulation pump 300 is started to pump the liquid medium in the liquid storage tank 200 into the branch pipe. After the liquid medium is atomized by the atomizing nozzle, it is sprayed on the surface of the battery cells in the battery box 100 to cool the battery.

[0094] Specifically, when the temperature of the battery is too high and smoke is generated, there may be a risk of battery combustion. At this time, if the battery surface is cooled only by a liquid medium, the cooling efficiency is not high enough to effectively suppress the risk of combustion. However, by atomizing the liquid medium through an atomizing nozzle and spraying it on the battery, the battery can be cooled quickly, the smoke can be eliminated, and the risk of combustion can be suppressed.

[0095] According to the thermal management control method of the embodiment of the present invention, the battery box 100 can exchange air with the liquid storage tank 200 to prevent the liquid medium from evaporating gas to the outside, and through the exchange of gas between the boxes, the liquid volume in the box can be flexibly controlled between full and empty. When the liquid temperature is high, all the liquid can be drained and then new low-temperature liquid can be injected, which not only improves the efficiency of liquid replacement and cooling, but also improves the uniformity of temperature control. In addition, the ventilation operation prevents the thermal expansion of the liquid from causing great pressure on the battery box 100. Different temperature control methods are set according to different temperature conditions, and the power of the circulating pump 300 and the temperature control device can be adjusted in real time to achieve better temperature control effects.

[0096] On the other hand, the present invention also provides a thermal management control device, comprising:

[0097] The processor may be implemented by a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of the present application;

[0098] The memory can be implemented in the form of a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory can store an operating system and other application programs. When the technical solution provided in the embodiments of this specification is implemented by software or firmware, the relevant program code is stored in the memory, and the processor is called to execute the thermal management control method of the embodiments of this application;

[0099] Input / output interface, used to realize information input and output;

[0100] Communication interface, used to realize communication interaction between this device and other devices. Communication can be realized through wired methods (such as USB, network cable, etc.) or wireless methods (such as mobile network, WIFI, Bluetooth, etc.);

[0101] The bus, which transfers information between the various components of the device (such as the processor, memory, input / output interfaces, and communication interfaces);

[0102] The processor, memory, input / output interface and communication interface are connected to each other through a bus inside the device.

[0103] An embodiment of the present application also provides an electronic device, including the thermal management control device as described above.

[0104] An embodiment of the present application further provides a storage medium, which is a computer-readable storage medium and stores a computer program. When the computer program is executed by a processor, the above-mentioned thermal management control method is implemented.

[0105] As a non-transient computer-readable storage medium, the memory can be used to store non-transient software programs and non-transient computer executable programs. In addition, the memory may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage devices. In some embodiments, the memory may optionally include a memory remotely arranged relative to the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned networks include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. The device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and are implemented to be located in one place, or may also be distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0106] It will be appreciated by those skilled in the art that all or some of the steps and systems in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or transient medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically include computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0107] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the above-mentioned implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions under the shared conditions without violating the spirit of the present invention. These equivalent deformations or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. A thermal management control method, characterized in that: Applied to an immersion energy storage battery system, the immersion energy storage battery system comprises: a plurality of battery boxes connected in parallel, a liquid storage tank, a circulation pump and a temperature regulating device, the liquid storage tank stores a liquid medium, and the temperature regulating device is used to regulate the temperature of the liquid medium; the method comprises: The circulation pump extracts the liquid medium from the liquid storage tank and enters the battery box; a first solenoid valve is provided between the liquid inlet of each battery box and the liquid outlet of the liquid storage tank, a second solenoid valve is provided between the liquid outlet of each battery box and one end of the circulation pump, the other end of the circulation pump is communicated with the liquid inlet of the liquid storage tank, a temperature sensor and a ventilation port are provided in each battery box, the ventilation port is communicated with the liquid storage tank, and a third solenoid valve is provided at the ventilation port; When the temperature sensor detects that the absolute value of the temperature difference between the battery temperature and the first preset temperature is between the first preset value and the second preset value, the first solenoid valve and the second solenoid valve are opened, and the power of the circulation pump and the temperature control power of the temperature control device are adjusted in real time according to the temperature difference, until the absolute value of the temperature difference is less than the first preset value; and the second preset value is greater than the first preset value; When the absolute value of the temperature difference between the battery temperature and the first preset temperature is between the second preset value and the third preset value, the first solenoid valve is closed, the second solenoid valve and the third solenoid valve are opened, and the circulating pump draws the liquid medium in the battery box to the liquid storage tank. After the temperature regulating device adjusts the liquid medium to the second preset temperature, the second solenoid valve is closed, the first solenoid valve and the third solenoid valve are opened, and the circulating pump draws the liquid medium in the liquid storage tank to the battery box. The third preset value is greater than the second preset value. The battery box is provided with a smoke sensor, the first solenoid valve is a three-way solenoid valve, the first outlet of the first solenoid valve is communicated with the interior of the battery box, the second outlet of the first solenoid valve is communicated with one end of a branch pipe, and the other end of the branch pipe is connected to an atomizing nozzle; the atomizing nozzle is provided in the battery box; the method further comprises the following steps: When the smoke sensor detects a smoke signal, the second outlet of the first solenoid valve is opened so that the liquid storage tank is connected to the branch pipeline; The circulation pump is started to pump the liquid medium in the liquid storage tank into the branch pipeline. The atomizing nozzle atomizes the liquid medium and then sprays it on the battery surface in the battery box to cool the battery.

2. The thermal management control method according to claim 1, characterized in that: The method further comprises: When the temperature sensor detects that the battery temperature is greater than the third preset value, there is a thermal runaway battery in the battery box, and the first solenoid valve, the second solenoid valve and the third solenoid valve of the battery box are opened, and the first solenoid valve, the second solenoid valve and the third solenoid valve of other battery boxes are closed, so that the circulation pump runs at maximum power and the temperature control device cools down at maximum power.

3. The thermal management control method according to claim 1, characterized in that: A heat exchanger is provided between the liquid storage tank and the battery box, a heat-conducting coil is provided in the heat exchanger, and the liquid inlet of each battery box is connected to the liquid outlet of the liquid storage tank after passing through the heat exchanger through a liquid inlet pipe; the temperature control device includes a heating element and a refrigerator, the heating element is provided in the liquid storage tank, the outlet of the refrigerator is connected to one end of the heat-conducting coil through a gas pipeline, the other end of the heat-conducting coil is connected to one end of an air pump through a gas pipeline, and the other end of the air pump is connected to the inlet of the refrigerator; The step of opening the first solenoid valve and the second solenoid valve when the temperature sensor detects that the absolute value of the temperature difference between the battery temperature and the first preset temperature is between the first preset value and the second preset value, and adjusting the power of the circulation pump and the temperature adjustment power of the temperature adjustment device in real time according to the temperature difference until the absolute value of the temperature difference is less than the first preset value, comprises: When the temperature sensor detects that the battery temperature is lower than the first preset temperature, and the absolute value of the temperature difference is greater than the first preset value and less than the second preset value, the first solenoid valve and the second solenoid valve are opened, and the power of the circulation pump and the heating power of the heating element are adjusted in real time according to the temperature difference to heat the liquid medium in the liquid storage tank until the absolute value of the temperature difference is less than the first preset value; When the temperature sensor detects that the battery temperature is higher than the first preset temperature, and the absolute value of the temperature difference is greater than the first preset value and less than the second preset value, the first solenoid valve and the second solenoid valve are opened, the heating element is closed, and the refrigeration power of the refrigerator is adjusted in real time according to the temperature difference, and the liquid medium in the heat exchanger is cooled by the refrigerant gas of the refrigerator until the absolute value of the temperature difference is less than the first preset value.

4. The thermal management control method according to claim 1, characterized in that: A first liquid level sensor is disposed at the bottom of the battery box, and a second liquid level sensor is disposed below the ventilation port; When the absolute value of the temperature difference between the battery temperature and the first preset temperature is between a second preset value and a third preset value, the first solenoid valve is closed, the second solenoid valve and the third solenoid valve are opened, and the circulating pump draws the liquid medium in the battery box to the liquid storage tank; after the temperature regulating device adjusts the liquid medium to the second preset temperature, the second solenoid valve is closed, the first solenoid valve and the third solenoid valve are opened, and the circulating pump draws the liquid medium in the liquid storage tank to the battery box; The step of the third preset value being greater than the second preset value comprises: When the temperature sensor detects that the absolute value of the temperature difference between the battery temperature and the first preset temperature is greater than a second preset value and less than a third preset value, the first solenoid valve is closed, the second solenoid valve and the third solenoid valve are opened, and the circulation pump draws the liquid medium in the battery box into the liquid storage tank until the first liquid level sensor detects that the liquid medium has been drained, and the circulation pump stops working; After the temperature control device adjusts the liquid medium in the liquid storage tank to a second preset temperature, the second solenoid valve is closed, and the first solenoid valve and the third solenoid valve are opened. The circulation pump draws the liquid medium in the liquid storage tank into the battery box until the second liquid level sensor detects that the height of the liquid medium in the battery box reaches a preset height, and then the first solenoid valve and the third solenoid valve are closed.

5. A thermal management control method, characterized in that: The invention is applied to an immersed energy storage battery system, wherein the immersed energy storage battery system comprises: a plurality of battery boxes, a liquid storage tank, a circulation pump, a temperature regulating device and a control device connected in series in sequence, wherein the liquid inlet of the first battery box is connected to the liquid outlet of the liquid storage tank through a liquid inlet pipe, the liquid outlet of the last battery box is connected to one end of the circulation pump through a liquid discharge pipe, and the other end of the circulation pump is connected to the liquid inlet of the liquid storage tank; a first solenoid valve is arranged at the liquid inlet of each battery box, and a second solenoid valve is arranged at the liquid outlet of each battery box; a temperature sensor for detecting the temperature of the battery is arranged in the battery box; the battery box is also provided with a ventilation port, which is communicated with the liquid storage tank through an air pipe, and a third solenoid valve is arranged at the ventilation port; the first solenoid valve, the second solenoid valve, the third solenoid valve, the temperature sensor, the circulation pump and the temperature regulating device are all electrically connected to the control device; a liquid medium is stored in the liquid storage tank, and the temperature regulating device is used to adjust the temperature of the liquid medium; the method comprises the following steps: The circulation pump draws the liquid medium from the liquid storage tank into the battery box until the height of the liquid medium in the battery box reaches a preset height; When the absolute value of the temperature difference between the temperature detected by the temperature sensor and the first preset temperature is greater than the first preset value and less than the second preset value, the control device opens the first solenoid valve and the second solenoid valve of all the battery boxes, and adjusts the power of the circulation pump and the temperature control power of the temperature control device in real time according to the temperature difference, until the absolute value of the temperature difference is less than the first preset value; the second preset value is greater than the first preset value; When the absolute value of the temperature difference between the temperature detected by the temperature sensor and the first preset temperature is greater than the second preset value and less than the third preset value, the control device closes the first solenoid valve of the battery box corresponding to the temperature sensor, opens the second solenoid valve and the third solenoid valve of the battery box, and the first solenoid valve and the second solenoid valve of all subsequent battery boxes, and the circulating pump draws the liquid medium in the battery box to the liquid storage tank, and closes the second solenoid valve of the battery box and the first solenoid valve and the second solenoid valve of all subsequent battery boxes; after the temperature control device adjusts the liquid medium to the second preset temperature, the control device opens the first solenoid valve and the third solenoid valve of the battery box, and the first solenoid valve and the second solenoid valve of all battery boxes before the battery box, and the circulating pump draws the liquid medium in the liquid storage tank to the battery box until the height of the liquid medium in the battery box reaches the preset height; the third preset value is greater than the second preset value; The battery box is provided with a smoke sensor, the first solenoid valve is a three-way solenoid valve, the first outlet of the first solenoid valve is communicated with the interior of the battery box, the second outlet of the first solenoid valve is communicated with one end of a branch pipe, and the other end of the branch pipe is connected to an atomizing nozzle; the atomizing nozzle is provided in the battery box, and the smoke sensor and the atomizing nozzle are both electrically connected to the control device; the method further comprises the following steps: When the smoke sensor detects a smoke signal, the second outlet of the first solenoid valve is opened so that the liquid storage tank is connected to the branch pipeline; The circulation pump is started to pump the liquid medium in the liquid storage tank into the branch pipeline. The atomizing nozzle atomizes the liquid medium and then sprays it on the battery surface in the battery box to cool the battery.

6. The thermal management control method according to claim 5, characterized in that: Each of the battery boxes is also provided with a spare liquid inlet and a spare liquid outlet, a fourth solenoid valve is provided at the spare liquid inlet, a fifth solenoid valve is provided at the spare liquid outlet, the spare liquid inlet is communicated with a spare liquid storage tank, the spare liquid outlet is communicated with one end of a spare circulation pump, a three-way solenoid valve is provided at the other end of the spare circulation pump, a first outlet of the three-way solenoid valve is communicated with the spare liquid storage tank, a second outlet of the three-way solenoid valve is communicated with a waste liquid tank, the fourth solenoid valve, the fifth solenoid valve and the three-way solenoid valve are all electrically connected to the control device, a refrigerant is provided in the spare liquid storage tank, and the temperature of the refrigerant is lower than that of the liquid medium; the method further comprises: When the temperature detected by the temperature sensor is greater than the third preset value, there is a thermal runaway battery in the battery box, and the control device closes the first solenoid valve and the second solenoid valve of all the battery boxes, opens the fourth solenoid valve and the fifth solenoid valve of the battery box with the thermal runaway battery, and opens the second outlet of the three-way solenoid valve; After the backup circulation pump draws the liquid medium of the battery box into the waste liquid tank, the control device closes the second outlet of the three-way solenoid valve and opens the first outlet of the three-way solenoid valve, and the backup circulation pump pumps the refrigerant in the backup liquid storage tank into the battery box until the battery temperature of the battery box is lower than the third preset value.

7. The thermal management control method according to claim 5, characterized in that: A heat exchanger is provided between the liquid storage tank and the first battery box, a heat-conducting coil is provided in the heat exchanger, a liquid inlet of the first battery box is connected to a liquid outlet of the liquid storage tank after passing through the heat exchanger via a liquid inlet pipe, and the heat exchanger is provided with an air inlet and an air outlet; the temperature control device comprises a heating element and a refrigerator, the heating element is provided in the liquid storage tank, the outlet of the refrigerator is connected to one end of the heat-conducting coil via a gas pipeline, the other end of the heat-conducting coil is connected to one end of an air pump via a gas pipeline, and the other end of the air pump is connected to the inlet of the refrigerator; The step of the control device opening the first solenoid valve and the second solenoid valve of all the battery boxes and adjusting the power of the circulation pump and the temperature regulating power of the temperature regulating device in real time according to the temperature difference, until the absolute value of the temperature difference is less than the first preset value, when the absolute value of the temperature difference between the temperature detected by the temperature sensor and the first preset temperature is greater than the first preset value and less than the second preset value, comprises: When the temperature detected by the temperature sensor is lower than the first preset temperature, and the absolute value of the temperature difference is greater than the first preset value and less than the second preset value, the control device opens the first solenoid valve and the second solenoid valve of all the battery boxes, and adjusts the power of the circulation pump and the heating power of the heating element in real time according to the temperature difference until the absolute value of the temperature difference is less than the first preset value; When the temperature detected by the temperature sensor is higher than the first preset temperature, and the absolute value of the temperature difference is greater than the first preset value and less than the second preset value, the control device opens the first solenoid valve and the second solenoid valve of all the battery boxes, turns off the heating element, and adjusts the power of the circulation pump and the refrigeration power of the refrigerator in real time according to the temperature difference, and cools the liquid medium in the heat exchanger by the refrigerant gas of the refrigerator until the absolute value of the temperature difference is less than the first preset value.

8. A thermal management control device, characterized in that: It includes at least one control processor and a memory for communicating with the at least one control processor; the memory stores instructions that can be executed by the at least one control processor, and the instructions are executed by the at least one control processor to enable the at least one control processor to execute the thermal management control method as described in any one of claims 1 to 7.

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