Immersed energy storage battery system

Abstract

The utility model discloses an immersed energy storage battery system, and relates to the technical field of battery management. The system comprises a liquid storage tank, a circulating pump, a plurality of battery boxes, a temperature adjusting device and a control device, the liquid storage tank is used for storing a liquid medium, a liquid inlet of each battery box is communicated with a liquid outlet of the liquid storage tank, a liquid outlet of each battery box is communicated with one end of the circulating pump, and the other end of the circulating pump is communicated with the liquid inlet of the liquid storage tank; a first electromagnetic valve is arranged at a liquid inlet of each battery box, and a second electromagnetic valve is arranged at a liquid outlet of each battery box; each battery box is further provided with an air exchange port, the air exchange port is communicated with the liquid storage box through an air pipe, and a third electromagnetic valve is arranged at the air exchange port; a temperature sensor is arranged in each battery box; the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the temperature sensor, the circulating pump and the temperature adjusting device are all electrically connected with the control device. The system can improve the temperature management effect.

Description

Technical Field

[0001] The utility model relates to the technical field of battery management, in particular to an immersion type energy storage battery system. 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. At the same time, due to poor temperature control, the temperature inside the battery box gradually rises, which in turn causes excessive air pressure inside the battery box, causing damage to the battery. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes an immersion energy storage battery system, which can improve the temperature control effect and avoid excessive internal pressure of the battery box.

[0004] In a first aspect, an immersion energy storage battery system according to an embodiment of the present utility model includes:

[0005] A liquid storage tank, used for storing liquid medium;

[0006] Circulation pump;

[0007] A plurality of battery boxes, wherein the liquid inlet of each battery box is connected to the liquid outlet of the liquid storage tank through a liquid inlet pipe, the liquid outlet of each 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 provided at the liquid inlet of each battery box, and a second solenoid valve is provided at the liquid outlet of each battery box; each battery box is also provided with a ventilation port, which is connected to the liquid storage tank through an air pipe, and a third solenoid valve is provided at the ventilation port; a temperature sensor for detecting the battery temperature is provided in each battery box;

[0008] A temperature regulating device, used for regulating the temperature of the liquid medium;

[0009] A control device, wherein 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.

[0010] According to some embodiments of the utility model, a heat exchanger is arranged between the liquid storage tank and the battery box, a heat conductive coil is arranged in the heat exchanger, and the liquid inlet of each battery box is connected with 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 arranged in the liquid storage tank, the outlet of the refrigerator is connected with one end of the heat conductive coil through a gas pipe, the other end of the heat conductive coil is connected with one end of the air pump through a gas pipe, and the other end of the air pump is connected with the inlet of the refrigerator.

[0011] According to some embodiments of the utility model, a smoke sensor is arranged 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 arranged in the battery box, and the smoke sensor and the atomizing nozzle are both electrically connected to the control device.

[0012] 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, and the first liquid level sensor and the second liquid level sensor are electrically connected to the control device, respectively.

[0013] According to some embodiments of the present utility model, a pressure sensor is also provided in the battery box.

[0014] In a second aspect, the submerged energy storage battery system according to an embodiment of the utility model includes:

[0015] A liquid storage tank, used for storing liquid medium;

[0016] Circulation pump;

[0017] A plurality of battery boxes, wherein the plurality of battery boxes are sequentially connected in series, 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 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 provided at the liquid inlet of each battery box, and a second solenoid valve is provided at the liquid outlet of each battery box; each battery box is also provided with a ventilation port, which is connected to the liquid storage tank through an air pipe, and a third solenoid valve is provided at the ventilation port; a temperature sensor for detecting the battery temperature is provided in each battery box;

[0018] A temperature regulating device, used for regulating the temperature of the liquid medium;

[0019] A control device, wherein 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.

[0020] According to some embodiments of the utility model, each battery box 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.

[0021] According to some embodiments of the utility model, a heat exchanger is arranged between the liquid storage tank and the first battery box, a heat conductive coil is arranged in the heat exchanger, the liquid inlet of the first battery box is connected to the liquid outlet of the liquid storage tank after passing through the heat exchanger through a 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 arranged in the liquid storage tank, the outlet of the refrigerator is connected to one end of the heat conductive coil through a gas pipe, the other end of the heat conductive coil is connected to one end of the air pump through a gas pipe, and the other end of the air pump is connected to the inlet of the refrigerator.

[0022] According to some embodiments of the utility model, a smoke sensor is arranged 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 arranged in the battery box, and the smoke sensor and the atomizing nozzle are both electrically connected to the control device.

[0023] 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, and the first liquid level sensor and the second liquid level sensor are electrically connected to the control device, respectively.

[0024] The submerged energy storage battery system according to the embodiment of the utility model has 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 can be set according to different temperature conditions to achieve better temperature control effects.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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:

[0027] Figure 1 This is a structural schematic diagram of an immersion energy storage battery system according to an embodiment of the utility model;

[0028] Figure 2 This is a structural schematic diagram of an immersion energy storage battery system according to another embodiment of the utility model. DETAILED DESCRIPTION

[0029] Embodiments of the utility model 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. The execution order of each step in the embodiment can be adaptively adjusted according to the understanding of those skilled in the art.

[0030] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, 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 cannot be understood as a limitation on the present invention.

[0031] The terms "first", "second", "third" and "fourth" etc. in the specification and claims of the utility model 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.

[0032] 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 locations 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.

[0033] 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. At the same time, due to poor temperature control, the temperature inside the battery box gradually rises, which in turn causes excessive air pressure inside the battery box, causing damage to the battery.

[0034] To this end, the embodiment of the utility model proposes an immersion energy storage battery system, in which 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. According to different temperature conditions, different temperature control methods can be set to achieve better temperature control effects.

[0035] On the one hand, the embodiment of the utility model provides a parallel immersion energy storage battery system, such as Figure 1As shown, the system includes: a liquid storage tank 100, a circulation pump 200, a plurality of battery boxes 300, a temperature regulating device (not shown) and a control device (not shown); wherein the liquid storage tank 100 is used to store liquid medium; the liquid inlet of each battery box 300 is connected to the liquid outlet of the liquid storage tank 100 through a liquid inlet pipe, and the liquid outlet of each battery box 300 is connected to one end of the circulation pump 200 through a liquid discharge pipe, and the other end of the circulation pump 200 is connected to the liquid inlet of the liquid storage tank 100; a first solenoid valve 4 is provided at the liquid inlet of each battery box 300 00, a second solenoid valve 500 is provided at the liquid outlet of each battery box 300; each battery box 300 is also provided with a ventilation port 310, and the ventilation port 310 is connected to the liquid storage tank 100 through an air pipe, and a third solenoid valve 600 is provided at the ventilation port 310; a temperature sensor for detecting the battery temperature is provided in each battery box 300; the temperature control device is used to adjust the temperature of the liquid medium; the first solenoid valve 400, the second solenoid valve 500, the third solenoid valve 600, the temperature sensor, the circulating pump 200 and the temperature control device are all electrically connected to the control device. The control device is used to control the switching state of each solenoid valve, as well as to control the power of the circulating pump 200 and the temperature control power of the temperature control device. The control device is also used to receive signals detected by the temperature sensor. Figure 1 It can be seen that in this example, several battery boxes 300 are in parallel connection, that is, each battery box 300 is connected to the liquid storage tank 100 and the circulation pump 200 respectively.

[0036] The working principle of the submerged energy storage battery system of the present utility model embodiment is as follows:

[0037] (1) The control device opens the first solenoid valve 400 of each battery box 300, so that the liquid inlet of the battery box 300 is connected to the liquid outlet of the liquid storage tank 100, so that the circulation pump 200 can pump the liquid medium in the liquid storage tank 100 into the battery box 300, so that the liquid medium cools the batteries in the battery box 300. At the same time, the third solenoid valve 600 of each battery box 300 can be opened, so that the ventilation port 310 of each battery box 300 is connected to the liquid storage tank 100, so that the battery box 300 can exchange air with the liquid storage tank 100 and prevent 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 thermal expansion of the liquid medium in the battery box 300 is prevented.

[0038] (2) When the battery temperature in the battery box 300 is within a normal range and the liquid medium does not flow, the first solenoid valve 400 and the second solenoid valve 500 are both closed and the circulation pump 200 does not need to work, thereby saving power.

[0039] (3) When the battery temperature in the battery box 300 is slightly higher than the upper limit of the normal range or the temperature difference is slightly greater than the set threshold, the first solenoid valve 400 at the liquid inlet and the second solenoid valve 500 at the liquid outlet of the battery box 300 are opened, so that the circulation pump 200 drives the liquid medium to flow between the battery box 300 and the liquid storage tank 100. The power of the circulation pump 200 is adjusted in real time according to the temperature control effect to control the flow rate, and the cooling power of the temperature regulating device is adjusted to reduce the temperature of the liquid medium and restore the battery temperature to the normal range;

[0040] (3) When the battery temperature in the battery box 300 is significantly higher than the upper limit of the normal range or the temperature difference is significantly greater than the set threshold, first close the first solenoid valve 400 at the liquid inlet of the battery box 300, and open the second solenoid valve 500 at the liquid outlet and the third solenoid valve 600 at the ventilation port 310, and the circulation pump 200 pumps the liquid medium in the battery box 300 to the liquid storage tank 100, and then cools the liquid medium to a certain degree through the temperature control device, and then closes the second solenoid valve 500 at the liquid outlet, and opens the first solenoid valve 400 at the liquid inlet and the third solenoid valve 600 at the ventilation port 310, and fills the battery box 300 with low-temperature liquid medium;

[0041] (4) When the battery temperature in the battery box 300 is slightly lower than the lower limit of the normal range, the first solenoid valve 400 and the second solenoid valve 500 are opened, so that the circulation pump 200 drives the liquid medium to flow between the battery box 300 and the liquid storage tank 100. The power of the circulation pump 200 is adjusted in real time according to the temperature control effect to control the flow rate, and the heating power of the temperature regulating device is adjusted to increase the temperature of the liquid medium so that the battery temperature returns to the normal range;

[0042] (5) When the battery temperature in the battery box 300 is significantly lower than the lower limit of the normal range, the first solenoid valve 400 of the battery box 300 is first closed and the second solenoid valve 500 and the third solenoid valve 600 are opened, and the circulation pump 200 pumps the liquid medium in the battery box 300 to the liquid storage tank 100, and then the liquid medium in the liquid storage tank 100 is heated by the temperature control device, and finally the second solenoid valve 500 is closed and the first solenoid valve 400 and the third solenoid valve 600 are opened to fill the battery box 300 with the high-temperature liquid medium;

[0043] (6) When the batteries in the battery box 300 become significantly hot due to thermal runaway, the solenoid valves of the liquid inlet, liquid outlet and ventilation port 310 of other battery boxes 300 are closed, and the solenoid valves of the liquid inlet, liquid outlet and ventilation port 310 of the battery box 300 where the thermal runaway battery is located are opened. While keeping the liquid medium in the battery box 300 not completely empty, the circulation pump 200 operates at maximum power, and the temperature control device cools down at maximum power, so as to control the temperature of the thermal runaway battery as quickly as possible, avoid accidents such as combustion of the thermal runaway battery, and avoid damage to other batteries.

[0044] Further, in some embodiments of the utility model, a heat exchanger (not shown) is provided between the liquid storage tank 100 and the battery box 300, a heat conduction coil is provided in the heat exchanger, and the liquid inlet of each battery box 300 is connected to the liquid outlet of the liquid storage tank 100 through the liquid inlet pipe and the heat exchanger; the temperature regulating device includes a heating element and a refrigerator, the heating element is provided in the liquid storage tank 100, 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 a gas pipeline, and the other end of the air pump is connected to the inlet of the refrigerator. When the battery temperature in the battery box 300 is slightly higher than the upper limit of the normal range or the temperature difference is slightly greater than the set threshold, the control device opens the first solenoid valve 400 and the second solenoid valve 500, closes the heating element, and adjusts the cooling power of the refrigerator in real time according to the temperature difference, and cools the liquid medium in the heat exchanger through the cooling gas of the refrigerator, thereby reducing the battery temperature. When the battery temperature in the battery box 300 is slightly lower than the lower limit of the normal range or the temperature difference is slightly greater than the set threshold, the control device opens the first solenoid valve 400 and the second solenoid valve 500, and adjusts the power of the circulation pump and the heating power of the heating element in real time according to the temperature difference to heat the liquid medium in the liquid storage tank 100, thereby increasing the battery temperature.

[0045] Furthermore, in some embodiments of the utility model, a smoke sensor is provided in the battery box 300, the first solenoid valve 400 is a three-way solenoid valve, the first outlet of the first solenoid valve 400 is connected to the interior of the battery box 300, the second outlet of the first solenoid valve 400 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 300, and the smoke sensor and the atomizing nozzle are both electrically connected to the control device. When the smoke sensor detects a smoke signal, the control device opens the second outlet of the first solenoid valve 400, so that the liquid storage tank 100 is connected to the branch pipe; the circulating pump 200 is started to pump the liquid medium in the liquid storage tank 100 into the branch pipe, and the atomizing nozzle atomizes the liquid medium and sprays it on the surface of the battery in the battery box 300 to cool the battery. When the battery temperature 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 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, smoke can be eliminated, and the risk of combustion can be suppressed.

[0046] Furthermore, in some embodiments of the present invention, a first liquid level sensor is provided at the bottom of the battery box 300, and a second liquid level sensor is provided below the ventilation port 310. The first liquid level sensor and the second liquid level sensor are electrically connected to the control device, respectively. By providing the first liquid level sensor and the second liquid level sensor, the height of the liquid medium in the battery box 300 can be detected, thereby determining whether the liquid medium in the battery box 300 has been drained or has reached a preset height.

[0047] Furthermore, in some embodiments of the present invention, a pressure sensor is also provided inside the battery box 300 for detecting the air pressure inside the battery box 300. When the temperature inside the battery box 300 is too high and the air pressure is too high, the third solenoid valve 600 at the ventilation port 310 can be opened to connect the battery box 300 with the liquid storage tank 100, thereby relieving the pressure in the battery box 300 and preventing the battery box 300 from being damaged due to excessive air pressure.

[0048] According to the submerged energy storage battery system of the embodiment of the utility model, the battery box 300 can exchange air with the liquid storage box 100 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 300. The battery box 300 is connected in parallel, which has a better temperature control effect on a single battery box 300, 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 200 and the temperature control device can be adjusted in real time to achieve a better temperature control effect.

[0049] On the other hand, the embodiment of the utility model also proposes a series-connected submerged energy storage battery system, such as Figure 2As shown, the system includes: a liquid storage tank 100, a circulation pump 200, a plurality of battery boxes 300, a temperature regulating device and a control device; the liquid storage tank 100 is used to store liquid medium; the plurality of battery boxes 300 are connected in series in sequence, the liquid inlet of the first battery box 300 is connected to the liquid outlet of the liquid storage tank 100 through a liquid inlet pipe, the liquid outlet of the last battery box 300 is connected to one end of the circulation pump 200 through a liquid discharge pipe, and the other end of the circulation pump 200 is connected to the liquid inlet of the liquid storage tank 100; a first solenoid valve 40 is provided at the liquid inlet of each battery box 300 0, a second solenoid valve 500 is provided at the liquid outlet of each battery box 300; each battery box 300 is also provided with a ventilation port 310, the ventilation port 310 is connected with the liquid storage tank 100 through an air pipe, and a third solenoid valve 600 is provided at the ventilation port 310; a temperature sensor for detecting the battery temperature is provided in each battery box 100; the temperature regulating device is used to regulate the temperature of the liquid medium; the first solenoid valve 400, the second solenoid valve 500, the third solenoid valve 600, the temperature sensor, the circulating pump 200 and the temperature regulating device are all electrically connected to the control device.

[0050] The working principle of the submerged energy storage battery system of the present utility model embodiment is as follows:

[0051] (1) The control device opens the first solenoid valve 400 and the second solenoid valve 500 of each battery box 300, and closes the second solenoid valve 500 of the last battery box 300, so that the liquid inlets of all battery boxes 300 are connected to the liquid outlet of the liquid storage tank 100, so that the circulation pump 200 can pump the liquid medium in the liquid storage tank 100 into the battery box 300, so that the liquid medium cools down the batteries in the battery box 300. At the same time, the third solenoid valve 600 of each battery box 300 can be opened, so that the ventilation port 310 of each battery box 300 is connected to the liquid storage tank 100, so that the battery box 300 can exchange air with the liquid storage tank 100, and prevent the liquid medium from evaporating gas to the outside. Through the ventilation operation, the liquid medium in the battery box 300 is prevented from thermally expanding and causing great pressure on the battery box 300, thereby damaging the battery.

[0052] (2) When the battery temperature in the battery box 300 is within the normal range and the temperature difference is less than the set threshold, the liquid does not flow;

[0053] (2) When the battery temperature in the battery box 300 is slightly higher than the upper limit of the normal range or the temperature difference is slightly greater than the set threshold, the first solenoid valve 400 of all liquid inlets and the second solenoid valve 500 of the liquid outlet are opened, and the liquid medium flows. The power of the circulation pump 200 is adjusted in real time according to the temperature control effect to control the flow rate, and the cooling power of the temperature regulating device is adjusted to reduce the temperature of the liquid;

[0054] (3) When the battery temperature is significantly higher than the upper limit of the normal range or the temperature difference is significantly greater than the set threshold, first close the first solenoid valve 400 of the liquid inlet of the battery box 300 where the battery is located, and open the second solenoid valve 500 and the third solenoid valve 600 of the battery box 300, and the first solenoid valve 400 and the second solenoid valve 500 of all subsequent battery boxes 300, and the circulating pump 200 pumps the liquid medium in the battery box 300 to the liquid storage tank 100, and then the liquid medium in the liquid storage tank 100 is cooled by the temperature control device, and finally the second solenoid valve 500 of the battery box 300 and the first solenoid valve 400 and the second solenoid valve 500 of all subsequent battery boxes 300 are closed, and the first solenoid valve 400 and the third solenoid valve 600 of the battery box 300 and the first solenoid valve 400 and the second solenoid valve 500 of all previous battery boxes 300 are opened to fill the battery box 300 with low-temperature liquid;

[0055] (4) When the battery temperature in the battery box 300 is slightly lower than the lower limit of the normal range, the first solenoid valve 400 and the second solenoid valve 500 of all the battery boxes 300 are opened, the liquid medium flows, and the power of the circulation pump 200 is adjusted in real time according to the temperature control effect to control the flow rate, and the heating power of the temperature regulating device is adjusted to increase the temperature of the liquid;

[0056] (5) When the temperature of the batteries in the battery box 300 is significantly lower than the lower limit of the normal range, first close the first solenoid valve 400 of the battery box 300 where the batteries are located, and open the second solenoid valve 500 and the third solenoid valve 600 of the battery box 300, as well as the first solenoid valve 400 and the second solenoid valve 500 of all subsequent battery boxes 300. The circulating pump 200 pumps the liquid in the battery box 300 to the liquid storage tank 100, and then the liquid in the liquid storage tank 100 is heated by the temperature control device. Finally, close the second solenoid valve 500 of the battery box 100 and the first solenoid valve 400 and the second solenoid valve 500 of all subsequent battery boxes 300, and open the first solenoid valve 400 and the third solenoid valve 600 of the battery box 300, as well as the first solenoid valve 400 and the second solenoid valve 500 of all previous battery boxes 300, and fill the battery box 300 with high-temperature liquid.

[0057] Further, in some embodiments of the utility model, each battery box 300 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 the spare liquid storage tank, the spare liquid outlet is connected to one end of the spare circulation pump, a three-way solenoid valve is provided at the other end of the spare circulation pump, the first outlet of the three-way solenoid valve is connected to the spare liquid storage tank, the second outlet of the three-way solenoid valve is connected to the 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, and a refrigerant is provided in the spare liquid storage tank, and the temperature of the refrigerant is lower than that of the liquid medium. When the battery has a significantly high temperature due to thermal runaway, the first solenoid valve 400 and the second solenoid valve 500 of all battery boxes 300 are closed to avoid affecting the batteries of other battery boxes 300. At the same time, open the fourth solenoid valve and the fifth solenoid valve of the battery box 300 with the thermal runaway battery, and open the second outlet of the three-way solenoid valve, so that the backup circulation pump discharges the liquid medium of the battery box 300 into the waste liquid tank, then close the second outlet of the three-way solenoid valve, and open the first outlet of the three-way solenoid valve, so that the backup circulation pump pumps the refrigerant in the backup liquid storage tank into the battery box 300 until the battery temperature of the battery box 300 returns to normal.

[0058] Further, in some embodiments of the utility model, a heat exchanger (not shown) is arranged between the liquid storage tank 100 and the first battery box 300, a heat conduction coil is arranged in the heat exchanger, and the liquid inlet of the first battery box 300 is connected to the liquid outlet of the liquid storage tank 100 after passing through the heat exchanger through the liquid inlet pipe; the temperature regulating device includes a heating element and a refrigerator, the heating element is arranged in the liquid storage tank 100, 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 a gas pipeline, and the other end of the air pump is connected to the inlet of the refrigerator. When the battery temperature in the battery box 300 is slightly higher than the upper limit of the normal range or the temperature difference is slightly greater than the set threshold, the control device opens the first solenoid valve 400 and the second solenoid valve 500 of all battery boxes 300, closes the heating element, and adjusts the cooling power of the refrigerator in real time according to the temperature difference, and cools the liquid medium in the heat exchanger through the cooling gas of the refrigerator, thereby reducing the battery temperature. When the battery temperature in the battery box 300 is slightly lower than the lower limit of the normal range or the temperature difference is slightly greater than the set threshold, the control device opens the first solenoid valve 400 and the second solenoid valve 500 of all the battery boxes 300, and adjusts the power of the circulation pump and the heating power of the heating element in real time according to the temperature difference to heat the liquid medium in the liquid storage tank 100, thereby increasing the battery temperature.

[0059] Furthermore, in some embodiments of the utility model, a smoke sensor is provided in the battery box 300, the first solenoid valve 400 is a three-way solenoid valve, the first outlet of the first solenoid valve 400 is connected to the interior of the battery box 300, the second outlet of the first solenoid valve 400 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 300, and the smoke sensor and the atomizing nozzle are both electrically connected to the control device. When the smoke sensor detects a smoke signal, the control device opens the second outlet of the first solenoid valve 400, so that the liquid storage tank 100 is connected to the branch pipe; the circulating pump 200 is started to pump the liquid medium in the liquid storage tank 100 into the branch pipe, and the atomizing nozzle atomizes the liquid medium and sprays it on the surface of the battery in the battery box 300 to cool the battery. When the battery temperature 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 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, smoke can be eliminated, and the risk of combustion can be suppressed.

[0060] Furthermore, in some embodiments of the present invention, a first liquid level sensor is provided at the bottom of the battery box 300, and a second liquid level sensor is provided below the ventilation port 310. The first liquid level sensor and the second liquid level sensor are electrically connected to the control device, respectively. By providing the first liquid level sensor and the second liquid level sensor, the height of the liquid medium in the battery box 300 can be detected, thereby determining whether the liquid medium in the battery box 300 has been drained or has reached a preset height.

[0061] Furthermore, in some embodiments of the present invention, a pressure sensor is also provided inside the battery box 300 for detecting the air pressure inside the battery box 300. When the temperature inside the battery box 300 is too high and the air pressure is too high, the third solenoid valve 600 at the ventilation port 310 can be opened to connect the battery box 300 with the liquid storage tank 100, thereby relieving the pressure in the battery box 300 and preventing the battery box 300 from being damaged due to excessive air pressure.

[0062] The above is a specific description of the preferred implementation of the utility model, but the utility model 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 utility model. These equivalent deformations or substitutions are all included in the scope defined by the claims of the utility model.

Claims

1. An immersion energy storage battery system, comprising a liquid storage tank, a circulation pump and a plurality of battery boxes, wherein the liquid storage tank is used to store liquid medium, the liquid inlet of each battery box is connected to the liquid outlet of the liquid storage tank, the liquid outlet of each battery box is connected to one end of the circulation pump, and the other end of the circulation pump is connected to the liquid inlet of the liquid storage tank, characterized in that: 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; each battery box is also provided with a ventilation port, which is connected to the liquid storage tank through an air pipe, and a third solenoid valve is provided at the ventilation port; a temperature sensor for detecting the battery temperature is provided in each battery box; The submerged energy storage battery system also includes a temperature regulating device and a control device, wherein the temperature regulating device is used to regulate the temperature of the liquid medium; a smoke sensor is arranged 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 arranged in the battery box, and the first solenoid valve, the second solenoid valve, the third solenoid valve, the temperature sensor, the circulating pump, the temperature regulating device, the smoke sensor and the atomizing nozzle are all electrically connected to the control device.

2. The submerged energy storage battery system according to claim 1, characterized in that: A heat exchanger is arranged between the liquid storage tank and the battery box, and a heat-conducting coil is arranged in the heat exchanger. The liquid inlet of each battery box is connected with 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 arranged in the liquid storage tank, the outlet of the refrigerator is connected with one end of the heat-conducting coil through a gas pipeline, the other end of the heat-conducting coil is connected with one end of the air pump through a gas pipeline, and the other end of the air pump is connected with the inlet of the refrigerator.

3. The submerged energy storage battery system 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. The first liquid level sensor and the second liquid level sensor are electrically connected to the control device, respectively.

4. The submerged energy storage battery system according to claim 1, characterized in that: A pressure sensor is also arranged in the battery box.

5. An immersion energy storage battery system, comprising: A liquid storage tank, a circulation pump and a plurality of battery boxes connected in series, wherein the liquid storage tank is used to store liquid medium, the liquid inlet of the first battery box is connected to the liquid outlet of the liquid storage tank, the liquid outlet of the last battery box is connected to one end of the circulation pump, and the other end of the circulation pump is connected to the liquid inlet of the liquid storage tank, characterized in that: 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; each battery box is also provided with a ventilation port, which is connected to the liquid storage tank through an air pipe, and a third solenoid valve is provided at the ventilation port; a temperature sensor for detecting the battery temperature is provided in each battery box; The submerged energy storage battery system also includes a temperature regulating device and a control device, wherein the temperature regulating device is used to regulate the temperature of the liquid medium; a smoke sensor is arranged 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 arranged in the battery box, and the first solenoid valve, the second solenoid valve, the third solenoid valve, the temperature sensor, the circulating pump, the temperature regulating device, the smoke sensor and the atomizing nozzle are all electrically connected to the control device.

6. The submerged energy storage battery system 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 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.

7. The submerged energy storage battery system according to claim 5, characterized in that: A heat exchanger is arranged between the liquid storage tank and the first battery box, and a heat-conducting coil is arranged in the heat exchanger. The liquid inlet of the first battery box is connected to the liquid outlet of the liquid storage tank after passing through the heat exchanger through an 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 arranged 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.

8. The submerged energy storage battery system according to claim 5, 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. The first liquid level sensor and the second liquid level sensor are electrically connected to the control device, respectively.

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