Immersed energy storage system and liquid cooling control method thereof

Abstract

The invention relates to an immersed energy storage system and a liquid cooling control method thereof, and relates to the technical field of energy storage. The immersed energy storage system comprises at least one battery pack, a liquid cooling circulation loop and a controller. The battery pack comprises a box body, a liquid cooling plate, a connecting pipeline, a detection unit and an adjusting unit, the side wall of the box body is provided with a first water inlet and a first water outlet, the liquid cooling plate is provided with a second water inlet and a second water outlet, and the connecting pipeline is used for connecting the first water outlet of the box body and the second water inlet of the liquid cooling plate and is connected into the liquid cooling circulation loop; the controller is in communication connection with the detection unit and the adjusting unit of the battery pack, and the controller is used for matching a current cooling mode for the battery pack according to the battery cell temperature of the battery module, and controlling the adjusting unit to enable the battery pack to be in the current cooling mode, so that the cooling mode is matched with the current running state of the battery pack, and the battery cells in the battery pack are cooled; the flexibility of the cooling operation of the immersed energy storage system is improved, and the power consumption can be reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of energy storage technology, and in particular to an immersion energy storage system and a liquid cooling control method thereof. Background Art

[0002] Immersion cooling technology is a technology that immerses energy storage batteries directly in coolant to achieve rapid and sufficient cooling through direct contact between the coolant and the battery cells. Immersion cooling technology can significantly improve the overall safety and economy of energy storage battery systems. Immersion cooling technology is widely used in the energy storage field due to its high heat dissipation efficiency, high heat dissipation stability and low heat dissipation cost.

[0003] However, current immersion cooling technology has certain limitations in terms of flow pattern, flexibility in dealing with different battery cell temperature conditions, and auxiliary system power consumption. Summary of the invention

[0004] Based on this, it is necessary to provide an immersion energy storage system and a liquid cooling control method thereof to address the problems in the prior art.

[0005] In a first aspect, the present disclosure provides an immersion energy storage system, comprising at least one battery pack, a liquid cooling circulation loop, and a controller;

[0006] At least one of the battery packs comprises:

[0007] A box body, wherein a battery module is arranged in the box body, and the battery module is immersed in a coolant. A first water inlet and a first water outlet are arranged on a side wall of the box body, and the first water inlet is connected to the liquid cooling circulation loop;

[0008] A liquid cooling plate is arranged outside the box, the liquid cooling plate has a second water inlet and a second water outlet, and the second water outlet is connected to the liquid cooling circulation loop;

[0009] A connecting pipeline is used to connect the first water outlet of the box body and the second water inlet of the liquid cooling plate, and is connected to the liquid cooling circulation loop;

[0010] A detection unit, installed in the battery pack, at least used to detect the temperature of the battery cell of the battery module;

[0011] an adjusting unit, provided in the connecting pipeline, for adjusting the conduction state of the connecting pipeline and the cooling mode of the battery pack;

[0012] Among them, the controller is communicatively connected with the detection unit and the adjustment unit of the battery pack respectively, and the controller is used to match the current cooling mode for the battery pack according to the cell temperature of the battery module, and control the adjustment unit to make the battery pack in the current cooling mode.

[0013] In one of the embodiments, the cooling mode of the battery pack includes a cold plate mode and a commutation mode;

[0014] When the cooling mode of the battery pack is the cold plate mode, the connecting pipeline disconnects the cooling liquid channel between the first water outlet of the box and the second water inlet of the liquid cooling plate, connects the second water inlet of the liquid cooling plate and the cooling liquid channel of the liquid cooling circulation loop, and the liquid cooling plate enters the liquid cooling plate through the liquid cooling circulation loop and then outputs back to the liquid cooling circulation loop for circulation;

[0015] When the cooling mode of the battery pack is the commutation mode, the connecting pipeline connects the cooling liquid channel of the first water outlet of the box and the second water inlet of the liquid cooling plate, disconnects the second water inlet of the liquid cooling plate and the cooling liquid channel of the liquid cooling circulation loop, and the cooling liquid enters the box and the liquid cooling plate through the liquid cooling circulation loop and is then output to circulate in the liquid cooling circulation loop.

[0016] In one embodiment, the first water outlet is provided on a first side wall of the box body, and the first water inlet is provided on a second side wall opposite to the first side wall;

[0017] The liquid cooling plate is a plate body attached to the bottom wall of the box body, the second water inlet is provided at the first end of the liquid cooling plate, and the second water outlet is provided at the second end of the liquid cooling plate;

[0018] Wherein, the first side wall is arranged on the same side as the first end of the liquid cooling plate, and the second side wall is arranged on the same side as the second end of the liquid cooling plate; in the flow conversion mode, the coolant flows along the first water inlet, the first water outlet, the second water inlet and the second water outlet.

[0019] In one embodiment, it also includes:

[0020] A liquid cooling unit, the liquid cooling unit is used to deliver the coolant to the battery pack through the liquid cooling circulation loop; the liquid cooling unit is provided with a temperature detection module, the temperature detection module is used to detect the temperature of the coolant output by the liquid cooling unit;

[0021] The controller is communicatively connected to the temperature detection module of the liquid cooling unit, and is also used to match the current cooling level for the battery pack according to the cell temperature of the battery module and the temperature of the coolant output by the liquid cooling unit, and control the adjustment unit to keep the battery pack at the current cooling level.

[0022] In one embodiment, the liquid cooling circulation loop includes a primary pipeline, a secondary pipeline and a battery pipeline, the primary pipeline is connected to the liquid cooling unit, the primary pipeline is connected to a plurality of the secondary pipelines; each of the secondary pipelines is connected to a plurality of the battery packs, the battery packs are connected to the secondary pipelines through the battery pipeline, and the battery pipeline includes the connecting pipeline;

[0023] The secondary pipeline is provided with a switch unit, and the controller is control-connected with the switch unit.

[0024] In one of the embodiments, the detection unit of the battery pack is further used to detect the resistance and voltage of the battery module of the battery pack;

[0025] When the resistance or voltage of the battery module of the battery pack is abnormal, the controller disconnects the switch unit on the secondary pipeline connected to the battery pack.

[0026] In one of the embodiments, the regulating unit of the battery pack includes a three-way valve.

[0027] In a second aspect, the present disclosure provides a liquid cooling control method for an immersion energy storage system, the liquid cooling control method comprising:

[0028] Obtain parameter information of the battery modules in the battery pack and temperature information of the liquid cooling circulation loop;

[0029] Determining a current cooling mode and a current cooling level of the battery pack according to parameter information of a battery module in the battery pack and temperature information of the liquid cooling circulation loop;

[0030] The cooling mode of the battery pack is adjusted to the current cooling mode, and the cooling level of the battery pack is adjusted to the current cooling level.

[0031] In one embodiment, the parameter information of the battery module in the battery pack includes the cell temperature of the battery module; and determining the current cooling mode and the current cooling level of the battery pack according to the parameter information of the battery module in the battery pack and the temperature information of the liquid cooling circulation loop includes:

[0032] Determining whether the battery core temperature is within a first temperature range;

[0033] When the battery cell temperature is within the first temperature range, matching the current cooling mode of the battery pack to a cold plate mode;

[0034] According to the temperature level of the battery cell temperature in the first temperature range, matching the battery pack with the current cooling level of the cold plate mode;

[0035] When the battery core temperature is not within the first temperature range, determining whether the battery core temperature is within a second temperature range;

[0036] When the battery cell temperature is within the second temperature range, matching the current cooling mode of the battery pack to a commutation mode;

[0037] According to the temperature level of the battery cell temperature in the second temperature range, the battery pack is matched with a current cooling level of the commutation mode.

[0038] In one of the embodiments, the parameter information of the battery module in the battery pack also includes the resistance and voltage of the battery module in the battery pack; and the control method further includes:

[0039] When the battery core temperature is not within the second temperature range, determining whether the battery core temperature is within a third temperature range;

[0040] When the battery cell temperature is within the third temperature range, determining whether the resistance or voltage of the battery module exceeds a preset threshold range;

[0041] When the resistance or voltage of the battery module exceeds the preset threshold range, the secondary pipeline connected to the battery pack is disconnected.

[0042] The immersion energy storage system and liquid cooling control method disclosed herein include at least one battery pack, a liquid cooling circulation loop and a controller; at least one battery pack includes a box, a liquid cooling plate, a connecting pipeline, a detection unit and an adjustment unit; the side wall of the box is provided with a first water inlet and a first water outlet, the liquid cooling plate has a second water inlet and a second water outlet, the connecting pipeline is used to connect the first water outlet of the box and the second water inlet of the liquid cooling plate, and is connected to the liquid cooling circulation loop; the controller is respectively connected to the detection unit and the adjustment unit of the battery pack, and the controller is used to match the current cooling for the battery pack according to the cell temperature of the battery module. mode, controls the regulating unit to put the battery pack in the current cooling mode, and the controller controls the flow path of the coolant by controlling the regulating unit, so that the first water outlet of the box and the second water inlet of the liquid cooling plate are connected to form a cooling liquid channel, or the second water inlet of the liquid cooling plate and the liquid cooling circulation loop are connected to form a cooling liquid channel, or the first water outlet of the box and the liquid cooling circulation loop are connected to form a cooling liquid channel, so as to adjust the cooling mode of the battery pack, so that the cooling mode matches the current operating state of the battery pack, cools the battery cells in the battery pack, improves the flexibility of the cooling operation of the immersion energy storage system, and is beneficial to reducing power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 is a schematic diagram of an immersion energy storage system provided in an embodiment;

[0045] Figure 2 is a schematic diagram of a battery pack provided in an embodiment;

[0046] Figure 3 is a schematic diagram of a battery pack provided in an embodiment in a cold plate mode;

[0047] Figure 4 A schematic diagram of a battery pack provided in an embodiment in a commutation mode;

[0048] Figure 5 is a schematic diagram of a battery pack provided in another embodiment;

[0049] Figure 6 A schematic diagram of a battery pack provided in another embodiment in a hybrid mode;

[0050] Figure 7 is a flow chart of a liquid cooling control method for an immersion energy storage system provided in one embodiment;

[0051] Figure 8 A block diagram of a computer device provided in one embodiment.

[0052] Description of reference numerals:

[0053] 210, battery pack; 211, housing; 2111, first water inlet; 2112, first water outlet; 212, liquid cooling plate; 2121, second water inlet; 2122, second water outlet; 213, connecting pipeline; 2131, first connecting pipe; 2132, second connecting pipe; 2133, third connecting pipe; 2134, fourth connecting pipe; 214, detection unit; 215, regulating unit; 220, liquid cooling circulation loop; 221, primary pipeline; 222, secondary pipeline; 223, battery pipeline; 2231, first branch; 2232, second branch; 230, controller; 240, liquid cooling unit; 250, switch unit. DETAILED DESCRIPTION

[0054] In order to facilitate understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are shown in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thorough and comprehensive.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.

[0056] As described in the background technology, the current immersion cooling technology still has many shortcomings. For example, the existing immersion cooling flow channel is set up in a single way, which cannot ensure that the coolant is evenly distributed in the battery pack, affecting the heat dissipation effect; the heat of the battery cell changes during operation, and the cooling requirements of the battery cell are different under different circumstances. The current immersion cooling technology has poor flexibility, which may lead to poor heat dissipation in some cases, and the battery cells in the battery pack cannot be cooled in time, affecting the working efficiency of the battery cell and not conducive to timely avoiding the risk of thermal runaway of the battery, or, in some cases, causing excessive cooling to cause the battery cell temperature to be too low, which is not only wasteful but also affects the working performance of the battery cell; and the existing immersion liquid cooling technology requires a large pump power to maintain the circulation of the coolant, which increases the power consumption of the auxiliary system. In addition, if the flow resistance of the coolant is large, it will further increase the power consumption.

[0057] According to an exemplary embodiment, this embodiment provides an immersion energy storage system, such as Figure 1-Figure 4As shown, the submerged energy storage system includes at least one battery pack 210, a liquid cooling circulation loop 220 and a controller 230; at least one battery pack 210 includes a box 211, a liquid cooling plate 212, a connecting pipe 213, a detection unit 214 and an adjustment unit 215; a battery module (not shown in the figure) is arranged in the box 211, and the battery module is immersed in the coolant. The side wall of the box 211 is provided with a first water inlet 2111 and a first water outlet 2112, and the first water inlet 2111 is connected to the liquid cooling circulation loop 220; the liquid cooling plate 212 is arranged on the outside of the box 211, and the liquid cooling plate 212 has a second water inlet 2121 and a second water outlet 2122, and the second water outlet 2122 is connected to the liquid cooling circulation loop 220. ; The connecting pipe 213 is used to connect the first water outlet 2112 of the box body 211 and the second water inlet 2121 of the liquid cooling plate 212, and is connected to the liquid cooling circulation loop 220; the detection unit 214 is installed in the battery pack 210, and is at least used to detect the battery cell temperature of the battery module; the adjustment unit 215 is arranged in the connecting pipe 213, and is used to adjust the conduction state of the connecting pipe 213 and the cooling mode of the battery pack 210; wherein the controller 230 is respectively communicated with the detection unit 214 and the adjustment unit 215 of the battery pack 210, and the controller 230 is used to match the current cooling mode for the battery pack 210 according to the battery cell temperature of the battery module, and control the adjustment unit 215 to make the battery pack 210 in the current cooling mode.

[0058] The submerged energy storage system is usually composed of a plurality of battery packs 210, each of which is provided with at least one group of battery modules, and each battery module includes a plurality of battery cells connected in parallel or in series to achieve higher energy storage and output power. The shell of the battery pack 210 is filled with coolant (the coolant can be liquid such as water or ethylene glycol), and the battery module is immersed in the coolant as a whole. During the charging and discharging process of the battery cell, a large amount of heat will be generated due to chemical reactions and current flow. If this heat cannot be dissipated in time, the temperature of the battery cell will rise, which may cause thermal runaway, resulting in reduced battery performance, shortened life and even safety problems. The liquid cooling circulation loop 220 cools the battery cell by circulating coolant to remove the heat generated by the battery cell. The coolant has a high thermal conductivity, and the coolant circulates and is in full contact with the battery cell of the battery module, which can effectively reduce the temperature of the battery pack 210.

[0059] like Figure 2-Figure 4As shown, the box body 211 of the battery pack 210 is provided with a first water inlet 2111 and a first water outlet 2112, and the liquid cooling plate 212 is attached to the outer wall of the box body 211, and the liquid cooling plate 212 has a second water inlet 2121 and a second water outlet 2122. Among them, the first water inlet 2111 of the box body 211 and the second water outlet 2122 of the liquid cooling plate 212 are directly connected to the liquid cooling circulation loop 220, and the first water inlet 2111 of the box body 211 and the second water outlet 2122 of the liquid cooling plate 212 can directly form a cooling liquid channel with the liquid cooling circulation loop 220. The first water inlet 2111 of the box 211 and the second water inlet 2121 of the liquid cooling plate 212 are connected through the connecting pipe 213, and the connecting pipe 213 is connected to the liquid cooling circulation loop 220. The regulating unit 215 is arranged in the connecting pipe 213. The regulating unit 215 can adjust the conduction state of the connecting pipe 213 to make the first water outlet 2112 of the box 211 and the second water inlet 2121 of the liquid cooling plate 212 conduct to form a cooling liquid channel, or the second water inlet 2121 of the liquid cooling plate 212 and the liquid cooling circulation loop 220 conduct to form a cooling liquid channel, or the box 211 can make the second water inlet 2121 of the liquid cooling plate 212 and the liquid cooling circulation loop 220 conduct to form a cooling liquid channel, or the box 211 can make the second water outlet 2112 of the box 211 and the second water inlet 2121 of the liquid cooling plate 212 conduct to form a cooling liquid channel, or the box 211 can make the second water outlet 2112 of the box 211 and the second water inlet 2121 of the liquid cooling plate 212 and the liquid cooling circulation loop 220 ... The first water outlet 2112 and the liquid cooling circulation loop 220 are connected to form a cooling liquid channel, thereby adjusting the flow path of the cooling liquid in the battery pack 210 to adjust the cooling mode of the battery pack 210. According to the changes in the operating conditions (such as temperature or resistance, voltage, etc.) of the battery cells in the battery pack 210, the conduction state of the connecting pipe 213 can be flexibly adjusted through the adjustment unit 215 to adjust the cooling mode of the battery pack 210, so that the cooling mode matches the current operating state of the battery pack 210, and the battery cells in the battery pack 210 are cooled, thereby improving the flexibility of the cooling operation of the immersion energy storage system and helping to reduce power consumption. The connecting pipe 213 can be encapsulated in the battery pack 210 or can also be set outside the battery pack 210, and this embodiment does not limit this.

[0060] The regulating unit 215 is disposed on the connecting pipe 213 of the battery pack 210. The regulating unit 215 is used to adjust the conduction state of the connecting pipe 213 so that the first water outlet 2112 of the box 211 and the second water inlet 2121 of the liquid cooling plate 212 are connected, the second water inlet 2121 of the liquid cooling plate 212 and the liquid cooling circulation loop 220 are connected, or the first water outlet 2112 of the box 211 and the liquid cooling circulation loop 220 are connected, so as to adjust the cooling mode of the battery pack 210. In some embodiments, the regulating unit 215 of the battery pack 210 includes a three-way valve. In other embodiments, the regulating unit 215 may also include other types of flow control devices (such as guide impellers, etc.). The regulating unit 215 is configured to adjust the direction and speed of the circulating flow of the coolant so that the battery pack 210 can have multiple cooling modes. The flow path of the coolant corresponding to each cooling mode in the battery pack 210 is different, and different current cooling modes can be selected according to the temperature of the battery module in the battery pack 210. The regulating unit 215 may be disposed at the first water outlet 2112 of the box body 211 , at the second water inlet 2121 of the liquid cooling plate 212 , or in a pipeline connecting the pipeline 213 , which is not limited in this embodiment.

[0061] The detection unit 214 is installed in the battery pack 210 and is at least used to detect the temperature of the battery cell of the battery module. The detection unit 214 includes at least a temperature detection device (such as a temperature sensor or an infrared thermometer, etc.) for detecting the temperature of the battery cell of the battery module. The detection unit 214 may include one or more temperature detection devices. For example, multiple groups of battery modules are arranged in the battery pack 210, and multiple temperature detection devices may be arranged correspondingly to respectively detect the temperature of the battery cells of each group of battery modules. Alternatively, multiple temperature detection devices may be arranged in the battery pack 210, and each detection device is used to detect the temperature of a battery cell. The installation position of the temperature detection device may be determined by the placement position of the one or more battery modules detected by it in the battery pack 210. It can be understood that the installation position of the temperature detection device is not specifically limited in this embodiment. The temperature detection device may be installed on the surface of the battery module in the battery pack 210 or on the inner wall surface of the battery pack 210.

[0062] The controller 230 may be a control terminal or a server. The controller 230 is used to control the operating state of the immersion energy storage system, such as the temperature of the coolant pumped by the liquid cooling circulation loop 220 to the battery pack 210, the current cooling mode of each battery pack 210, etc. The controller 230 is respectively connected to the detection unit 214 of each battery pack 210 in communication, so as to obtain the parameter information of the battery module in each battery pack 210 in real time, so as to obtain the operating state of the battery cell of the battery module of each battery pack 210. The controller 230 is respectively connected to the condition unit control of each battery pack 210. The controller 230 obtains the battery cell temperature of the battery module of the battery pack 210 according to the parameter information of the battery pack 210, matches the current cooling mode for the battery pack 210 according to the battery cell temperature, and controls the adjustment unit 215 to put the battery pack 210 in the current cooling mode.

[0063] The above-mentioned immersion energy storage system includes at least one battery pack 210, a liquid cooling circulation loop 220 and a controller 230; at least one battery pack 210 includes a box 211, a liquid cooling plate 212, a connecting pipe 213, a detection unit 214 and an adjustment unit 215; the side wall of the box 211 is provided with a first water inlet 2111 and a first water outlet 2112, the liquid cooling plate 212 has a second water inlet 2121 and a second water outlet 2122, the connecting pipe 213 is used to connect the first water outlet 2112 of the box 211 and the second water inlet 2121 of the liquid cooling plate 212, and is connected to the liquid cooling circulation loop 220; the controller 230 is respectively connected to the detection unit 214 and the adjustment unit 215 of the battery pack 210, and the controller 230 is used to provide the battery pack 21 with a temperature of the battery cell according to the temperature of the battery module. 0 matches the current cooling mode, controls the regulating unit 215 to put the battery pack 210 in the current cooling mode, and the controller 230 controls the flow path of the coolant by controlling the regulating unit 215, so that the first water outlet 2112 of the box 211 and the second water inlet 2121 of the liquid cooling plate 212 are connected to form a cooling liquid channel, or the second water inlet 2121 of the liquid cooling plate 212 is connected to the liquid cooling circulation loop 220 to form a cooling liquid channel, or the first water outlet 2112 of the box 211 and the liquid cooling circulation loop 220 are connected to form a cooling liquid channel, so as to adjust the cooling mode of the battery pack 210, so that the cooling mode matches the current operating state of the battery pack 210, cools the battery cells in the battery pack 210, improves the flexibility of the cooling operation of the immersion energy storage system, and is conducive to reducing power consumption.

[0064] In some embodiments, the cooling modes of the battery pack 210 include a cold plate mode and a commutation mode.

[0065] In this embodiment, if Figure 2-Figure 3As shown, the connecting pipe 213 includes a first connecting pipe 2131, a second connecting pipe 2132 and a third connecting pipe 2133. The first end of the first connecting pipe 2131 is connected to the liquid cooling circulation loop 220, the first end of the second connecting pipe 2132 is connected to the first water outlet 2112 of the box 211, and the first end of the third connecting pipe 2133 is connected to the second water inlet 2121 of the liquid cooling plate 212. The second end of the second connecting pipe 2132, the second end of the third connecting pipe 2133 and the second end of the first connecting pipe 2131. The regulating unit 215 includes a three-way valve arranged at the second end of the first connecting pipe 2131.

[0066] In the cold plate mode, the first connecting pipe 2131 and the third connecting pipe 2133 of the connecting pipe 213 are connected to form a cooling liquid channel. In the commutation mode, the second connecting pipe 2132 and the third connecting pipe 2133 of the connecting pipe 213 are connected to form a cooling liquid channel.

[0067] like Figure 3 As shown, when the cooling mode of the battery pack 210 is the cold plate mode, the connecting pipe 213 disconnects the cooling liquid channel of the first water outlet 2112 of the box body 211 and the second water inlet 2121 of the liquid cooling plate 212, and connects the second water inlet 2121 of the liquid cooling plate 212 and the cooling liquid channel of the liquid cooling circulation loop 220. The liquid cooling plate 212 enters the liquid cooling plate 212 through the liquid cooling circulation loop 220 and then is output back to the liquid cooling circulation loop 220 for circulation.

[0068] like Figure 4 As shown, when the cooling mode of the battery pack 210 is the commutation mode, the connecting pipe 213 connects the cooling liquid channel of the first water outlet 2112 of the box body 211 and the second water inlet 2121 of the liquid cooling plate 212, and disconnects the cooling liquid channel of the second water inlet 2121 of the liquid cooling plate 212 and the liquid cooling circulation loop 220. The cooling liquid enters the box body 211 and the liquid cooling plate 212 through the liquid cooling circulation loop 220 and is then output to the liquid cooling circulation loop 220 for circulation.

[0069] The controller 230 obtains parameter information of the battery pack 210 in real time through the detection unit 214. When the cell temperature of the battery module detected by the detection unit 214 in the battery pack 210 is within the first temperature range, the controller 230 controls the adjustment unit 215 to enable the connecting pipeline 213 to disconnect the cooling liquid channel between the first water outlet 2112 of the box 211 and the second water inlet 2121 of the liquid cooling plate 212, and connect the second water inlet 2121 of the liquid cooling plate 212 and the cooling liquid channel of the liquid cooling circulation loop 220, so that the current cooling mode of the battery pack 210 runs the cold plate mode, and the heat in the box 211 is taken away by the flow of coolant in the liquid cooling plate 212, so as to reduce the temperature of the coolant in the box 211, thereby reducing the temperature of the cell of the battery module, and ensuring that the cell remains within a good operating temperature range. When any detected temperature of the battery cell temperature of the battery module detected by the detection unit 214 in the battery pack 210 is higher than the first temperature zone and the battery cell temperature of the battery module is within the second temperature zone, the controller 230 controls the regulating unit 215 to cause the connecting pipe 213 to disconnect the second water inlet 2121 of the liquid cooling plate 212 and the cooling liquid channel of the liquid cooling circulation loop 220, and to connect the first water outlet 2112 of the box 211 and the cooling liquid channel of the second water inlet 2121 of the liquid cooling plate 212 so that the current cooling mode of the battery pack 210 operates in the commutation mode, so that the cooling liquid of the box 211 participates in the liquid cooling circulation loop The cooling liquid circulates in the cooling plate 212, and the cooling liquid in the box 211 is exchanged with the cooling liquid in the liquid cooling circulation loop 220 and the cooling liquid in the liquid cooling plate 212. The cooling liquid with a lower temperature in the liquid cooling circulation loop 220 enters the box 211, and the original cooling liquid in the box 211 enters the liquid cooling circulation loop 220 again through the liquid cooling plate 212 to participate in the cooling liquid circulation, thereby quickly reducing the cooling liquid temperature in the box 211, accelerating the heat dissipation, and then quickly cooling the battery cells in the box 211, so as to reduce the battery cells whose temperature exceeds the first temperature range to within the first temperature range, thereby ensuring that the battery cells remain within a good operating temperature range.

[0070] In the submerged energy storage system of this embodiment, the controller 230 controls the battery pack 210 to operate in the cold plate mode or the commutation mode according to the cell temperature of the battery module in the battery pack 210. The cold plate mode is applicable when the temperature of the battery module is low, and the battery module in the box 211 is cooled by circulating the coolant in the liquid cold plate 212. The commutation mode is applicable when there are cells with high temperatures in the battery module, and the cells with abnormal temperatures in the box 211 are cooled quickly by circulating the coolant in the commutation box 211. The commutation mode is applicable to quickly respond to the increase in the temperature of the battery module, and the cell temperature is more effectively reduced by changing the flow path of the coolant to prevent overheating of the battery. The controller 230 controls the battery pack 210 in real time according to the temperature of the cell of the battery module. Adjust the cooling mode to the cold plate mode or the commutation mode to ensure that the battery pack 210 is in a good operating temperature range and that the battery pack 210 operates in a safe and efficient state. In the immersed energy storage system of this embodiment, the controller 230 intelligently adjusts the cooling mode of the battery pack 210 according to the temperature of the battery cells of the battery module, and timely cools the battery cells in the battery pack 210 according to the cooling requirements of the battery cells, which can timely avoid the risk of thermal runaway of the battery pack 210, and is beneficial to improving the working efficiency of the battery pack 210. At the same time, it can also improve the energy waste caused by untimely cooling or over-cooling caused by a single cooling mode, which is beneficial to reducing the redundant power consumption of the immersed energy storage system for temperature control of the battery pack 210 and saving costs.

[0071] In some other embodiments, such as Figure 5 , Figure 6 As shown, the box body 211 is provided with two first water outlets 2112, one of which is connected to the second connecting pipe 2132. The connecting pipeline 213 also includes a fourth connecting pipe 2134, one end of which is connected to the other first water outlet 2112, and the other end of which is connected to the liquid cooling circulation loop 220. The regulating unit 215 also includes a control valve 2152 provided on the fourth connecting pipe 2134, and the control valve 2152 is used to control the conduction / disconnection of the fourth connecting pipe 2134.

[0072] In this embodiment, the cooling mode of the battery pack 210 also includes a mixed mode. When the cooling mode of the battery pack 210 is a mixed mode, Figure 6As shown, the first connecting pipe 2131 and the third connecting pipe 2133 of the connecting pipe 213 are connected to form a cooling liquid channel, and the connecting pipe 213 is connected to the cooling liquid channel of the liquid cooling circulation loop 220 of the box body 211. At the same time, the fourth connecting pipe 2134 of the connecting pipe 213 is connected to the other second water inlet 2121 of the liquid cooling plate 212 and the cooling liquid channel of the liquid cooling circulation loop 220. The cooling liquid in the box body 211 enters the liquid cooling plate 212 through the liquid cooling circulation loop 220 and is then output back to the liquid cooling circulation loop 220 for circulation. At the same time, the liquid cooling plate 212 enters the liquid cooling plate 212 through the liquid cooling circulation loop 220 and is then output back to the liquid cooling circulation loop 220 for circulation. Part of the cooling liquid of the liquid cooling circulation loop 220 enters the box body 211 through the first water inlet 2111 of the box body 211, and the cooling liquid in the box body 211 enters the liquid cooling circulation loop 220 through the first water outlet 2112 to participate in the cooling liquid circulation, so that the temperature of the cooling liquid in the box body 211 is quickly reduced, so that the battery module in the box body 211 can be immersed in the cooling liquid with lower temperature, and the battery cells of the battery module are quickly cooled. At the same time, part of the coolant in the liquid cooling circulation loop 220 enters the liquid cooling plate 212 through the second water inlet 2121 of the liquid cooling plate 212, and the coolant flows back to the liquid cooling circulation loop 220 through the second water outlet 2122 of the liquid cooling plate 212 to participate in the coolant circulation, so that the temperature of the coolant flowing in the liquid cooling plate 212 is lower, and part of the heat of the box 211 is taken away by the flow of coolant in the liquid cooling plate 212 to cool the box 211, so that the temperature of the battery cell drops rapidly, avoiding the risk of thermal runaway of the battery pack 210, which is beneficial to improving the working efficiency of the battery pack 210.

[0073] In some embodiments, Figure 2-Figure 4 As shown, the first water outlet 2112 is arranged on the first side wall of the box body 211, and the first water inlet 2111 is arranged on the second side wall arranged opposite to the first side wall; the liquid cooling plate 212 is a plate body attached to the bottom wall of the box body 211, the second water inlet 2121 is arranged at the first end of the liquid cooling plate 212, and the second water outlet 2122 is arranged at the second end of the liquid cooling plate 212; wherein, the first side wall is arranged on the same side as the first end of the liquid cooling plate 212, and the second side wall is arranged on the same side as the second end of the liquid cooling plate 212; in the commutation mode, the cooling liquid flows along the first water inlet 2111, the first water outlet 2112, the second water inlet 2121 and the second water outlet 2122.

[0074] Among them, the box body 211 can be an integrated structure, or the box body 211 can include a detachable structure of a main body and a cover plate. The box body 211 is a cubic structure, for example, it can be a rectangular parallelepiped structure or a cube structure. The box body 211 includes a bottom surface and a top surface that are relatively arranged, and the battery module is arranged on the bottom surface of the box body 211 and is placed on the inner side of the box body 211. In this embodiment, the liquid cooling plate 212 is arranged on the outer wall surface of the bottom wall of the box body 211, that is, the box body 211 is arranged on the liquid cooling plate 212, so that the liquid cooling plate 212 is closer to the battery module, so that in the cold plate mode or the mixed mode, the heat exchange speed between the liquid cooling plate 212 and the battery module in the box body 211 is faster, and the flow of coolant in the liquid cooling plate 212 can cool down the battery module in the box body 211 more quickly, so that the battery cells of the battery module are kept at the optimal operating temperature.

[0075] In this embodiment, the area of ​​the liquid cooling plate 212 is larger than the area of ​​the bottom wall of the box 211, and the liquid cooling plate 212 contacts the entire bottom wall of the box 211. In this way, when the coolant flows in the liquid cooling plate 212, it can more fully exchange heat with the box 211 and the battery module inside it, absorb and take away the heat generated by the battery module more quickly, thereby improving the heat exchange efficiency of the entire cooling system. The larger the area of ​​the liquid cooling plate 212, the more coolant can contact it, thereby increasing the heat dissipation area, and can more effectively reduce the temperature of the coolant and the battery module core of the box 211, ensuring that the battery pack 210 can maintain a good thermal management state even under long-term high-load operation. The contact plate between the liquid cooling plate 212 and the entire bottom wall of the box 211 can better disperse the heat generated by the battery module and reduce the risk of local overheating. This helps to improve the stability and safety of the battery pack 210 and extend the service life of the battery.

[0076] The box body 211 includes a first side wall (not numbered in the figure) and a second side wall (not numbered in the figure) that are relatively arranged. The first water outlet 2112 is arranged on the first side wall, and the first water inlet 2111 is arranged on the second side wall. In this way, in the commutation mode or the mixed mode, the coolant in the box body 211 participates in the coolant circulation of the liquid cooling circulation loop 220, and the coolant flows from the first water inlet 2111 to the first water outlet 2112, which can increase the flow path of the coolant entering the box body 211 in the box body 211, so that the coolant is in full contact with the battery module, and the flow takes away the heat of the battery cells of the battery module, which can quickly and effectively cool the battery cells of the battery module.

[0077] The second water inlet 2121 of the liquid cooling plate 212 is arranged at the first end of the liquid cooling plate 212, and the second water outlet 2122 is arranged at the second end of the liquid cooling plate 212. The first side wall is arranged on the same side as the first end of the liquid cooling plate 212, and the second side wall is arranged on the same side as the second end of the liquid cooling plate 212. In this way, in the commutation mode, the cooling liquid circulation path in the battery pack 210 is to enter the box body 211 through the first water inlet 2111, and the cooling liquid exchanges heat with the battery module in the box body 211 and enters the connecting pipe 213 through the first water outlet 2112, and then enters the liquid cooling plate 212 through the second water inlet 2121, and then enters the liquid cooling plate 212, and flows back to the liquid cooling circulation loop 220 again through the second water outlet 2122 of the liquid cooling plate 212 to enter the cooling liquid circulation.

[0078] In some embodiments, which are not shown in the drawings of this embodiment, the housing 211 may have a plurality of first water inlets 2111, and the side walls and the top surface of the housing 211 may be provided with first water inlets 2111 to increase the entrance of the coolant into the housing 211, so that the coolant can fully contact the battery module in the housing 211 after entering the housing 211, thereby reducing the local overheating phenomenon caused by uneven distribution of the coolant. The coolant can enter the housing 211 from multiple directions, which can more evenly distribute the coolant flow entering the housing 211, increase the flow path of the coolant entering the housing 211, make the coolant more fully contact the battery module, and increase the residence time of the coolant in the housing 211, thereby improving the heat exchange efficiency. The design of multiple water inlets allows the coolant to penetrate into every corner of the battery module more evenly, ensuring that the heat can be taken away in time, thereby keeping the battery module running within the optimal temperature range.

[0079] The box body 211 also includes a third side wall and a fourth side wall that are arranged opposite to each other. The second side wall, the third side wall, the fourth side wall and the top wall of the box body 211 are each provided with at least one first water inlet 2111. The second side wall, the third side wall, the fourth side wall and the top wall of the box body 211 are each provided with at least one first water inlet 2111, ensuring that the coolant can enter the box body 211 from multiple directions and multiple positions, which helps the coolant to form a more complex and uniform flow network in the box body 211, and can quickly and effectively cool down the battery cells of the battery module in the commutation mode or the mixed mode.

[0080] In one embodiment, a plurality of first water inlets 2111 are evenly arranged on the second side wall of the box body 211 to increase the length of the flow path of the coolant after entering the box body 211, so as to make the coolant more fully contact with the battery module and improve the heat exchange efficiency.

[0081] Multiple first water inlets 2111 may also be arranged on the third side wall, the fourth side wall and the top wall of the box body 211. In order to optimize the cooling effect and prolong the contact time between the coolant and the battery module, the arrangement density of the first water inlets 2111 on the third side wall close to the second side wall is greater than the arrangement density of the first water inlets 2111 on the third side wall close to the first side wall, the arrangement density of the first water inlets 2111 on the fourth side wall close to the second side wall is greater than the arrangement density of the first water inlets 2111 on the fourth side wall close to the first side wall, and the arrangement density of the first water inlets 2111 on the top wall close to the second side wall is greater than the arrangement density of the first water inlets 2111 on the top wall close to the first side wall.

[0082] The above-mentioned immersion energy storage system sets the position and density of the first water inlet 2111 according to the natural flow trend of the coolant in the box 211 and the thermal distribution characteristics of the battery module, so that the coolant can flow to the area with higher heat more effectively, thereby improving the cooling efficiency; by adjusting the density and position of the water inlet, the contact time between the coolant and the battery module can be extended, and the coolant entering the box 211 can flow fully in the box 211, avoiding the occurrence of commutation dead corners, and can more fully absorb and take away the heat generated by the battery module, ensuring that the battery module operates at a safe and stable temperature.

[0083] In this embodiment, the non-uniform density of the first water inlet 2111 provides more possibilities for the optimization of the immersion energy storage system. The position and number of the first water inlet 2111 can be adjusted according to the layout and shape of the battery module to optimize the coolant flow path and improve the heat exchange efficiency, thereby improving the cooling performance of the battery pack 210 and extending the service life of the battery pack 210, providing a strong guarantee for the reliability and safety of the immersion energy storage system.

[0084] In some embodiments, Figure 1 As shown, the immersed energy storage system also includes a liquid cooling unit 240, which is used to transport coolant to the battery pack 210 through the liquid cooling circulation loop 220; the liquid cooling unit 240 is provided with a temperature detection module, and the temperature detection module is used to detect the temperature of the coolant output by the liquid cooling unit 240; the controller 230 is communicatively connected with the temperature detection module of the liquid cooling unit 240, and the controller 230 is also used to match the current cooling level for the battery pack 210 according to the cell temperature of the battery module and the temperature of the coolant output by the liquid cooling unit 240, and control the regulating unit 215 to make the battery pack 210 at the current cooling level.

[0085] Among them, the liquid cooling unit 240 is a cooling system, and the liquid cooling unit 240 is used to control the temperature of the coolant in the immersion energy storage system. The liquid cooling unit 240 includes at least a temperature detection module, a refrigeration cycle module, a heating module and a water pump. The temperature detection module is used to detect the temperature of the coolant at the inlet and outlet of the liquid cooling unit 240. The refrigeration cycle module includes a fan, a refrigeration phase change medium and a heat exchanger. The refrigeration cycle module drives the air flow through the fan to make the air and the refrigeration phase change medium exchange heat. After absorbing the heat in the air, the state of the refrigeration phase change medium will change (such as from liquid to gas), thereby taking away the heat. Subsequently, the refrigeration phase change medium and the coolant perform secondary heat exchange in the heat exchanger, and the absorbed heat is transferred to the coolant to achieve cooling of the immersion liquid. This indirect cooling method helps to avoid the pollution and corrosion problems that may be caused by direct cooling. The heating unit is used to increase the temperature of the coolant. The water pump is used to drive the coolant to circulate between the liquid cooling unit 240, the liquid cooling circulation loop 220 and the battery pack 210, ensuring that the immersion liquid can continuously and evenly absorb and release heat, thereby maintaining the temperature of the entire system stable.

[0086] In this embodiment, the controller 230 is controlled and connected to the liquid cooling unit 240, and is communicatively connected to the temperature detection module of the liquid cooling unit 240. The controller 230 is used to obtain the temperature of the coolant of the liquid cooling unit 240 detected by the temperature detection module in real time. When the current temperature of the coolant of the liquid cooling unit 240 is higher than the preset temperature threshold, the controller 230 controls the refrigeration cycle module to cool the coolant of the liquid cooling unit 240 to reduce the temperature of the coolant of the liquid cooling unit 240 to the preset temperature threshold. When the current temperature of the coolant of the liquid cooling unit 240 is lower than the preset temperature threshold, the controller 230 controls the heating module to heat the coolant of the liquid cooling unit 240 to increase the temperature of the coolant of the liquid cooling unit 240 to the preset temperature threshold, so that the liquid cooling unit 240 can constantly pump coolant of the preset temperature threshold to the liquid cooling circulation loop 220. The liquid cooling unit 240 is connected to the water pump control of the liquid cooling unit 240. The liquid cooling unit 240 adjusts the pumping flow of the water pump according to the temperature of the coolant of the liquid cooling unit 240 detected by the temperature detection module and the parameter information of the battery module detected by the detection unit 214 to adjust the volume of the coolant pumped to the liquid cooling circulation loop 220 per unit time.

[0087] The controller 230 matches the current cooling level for the battery pack 210 according to the cell temperature of the battery module and the temperature of the coolant output by the liquid cooling unit 240, and controls the regulating unit 215 to keep the battery pack 210 at the current cooling level. Each cooling mode may have multiple cooling levels (such as level 1, level 2, level 3, etc.), and the flow rate of the coolant in the battery pack 210 corresponding to different levels is different.

[0088] The controller 230 obtains the parameter information of the battery module in the battery pack 210 through the detection unit 214, and obtains the battery cell temperature of the battery module. At the same time, the controller 230 detects the temperature information of the coolant pumped by the liquid cooling unit 240 to the liquid cooling circulation loop 220 through the temperature detection module. The controller 230 conducts a comprehensive analysis of the battery cell temperature and the coolant temperature. The controller 230 combines the current level mode of the battery pack 210 to evaluate the current cooling demand of the battery pack 210. The controller 230 matches a suitable current cooling level for the battery pack 210 according to the cooling level strategy. The controller 230 sends an instruction to the adjustment unit 215, and the adjustment unit 215 adjusts the flow rate of the connecting pipe 213 so that the battery pack 210 runs at the current cooling level to ensure that the battery pack 210 can be maintained within the operating temperature range of the current cooling level.

[0089] The cooling level strategy can be formulated based on the working characteristics, safety thresholds, and cooling efficiency of the battery module. The cooling level strategy can be stored in an external database. The controller 230 retrieves the cooling level strategy in the external database and matches the cooling level strategy corresponding to the current cooling mode according to the battery cell temperature of the battery module and the temperature of the coolant output by the liquid cooling unit 240.

[0090] The immersed energy storage system of this embodiment, by matching the appropriate cooling level for the battery pack 210, is conducive to keeping the battery module operating within the optimal operating temperature range, improving the temperature control accuracy of the battery pack 210, reducing the thermal stress of the battery module caused by temperature fluctuations, and extending the service life of the battery pack 210; the immersed energy storage system of this embodiment can not only adjust the current cooling mode of the battery pack 210, but also adjust the current cooling level corresponding to the current cooling mode. According to the working state of the battery module and the changes in the external environment, the controller 230 can dynamically adjust the cooling level to adapt to different cooling requirements, reduce unnecessary energy consumption, and achieve a more energy-saving and efficient operation mode, providing a safer, more efficient and flexible cooling guarantee for the battery module.

[0091] In some embodiments, reference Figure 1-Figure 6 As shown, the liquid cooling circulation loop 220 includes a primary pipeline 221, a secondary pipeline 222 and a battery pipeline 223. The primary pipeline 221 is connected to the liquid cooling unit 240, and the primary pipeline 221 is connected to multiple secondary pipelines 222; each secondary pipeline 222 is connected to multiple battery packs 210, and the battery pack 210 is connected to the secondary pipeline 222 through the battery pipeline 223, and the battery pipeline 223 includes a connecting pipeline 213; a switch unit 250 is provided on the secondary pipeline 222, and the controller 230 is controlled and connected to the switch unit 250.

[0092] Among them, the primary pipeline 221 is the main pipeline of the liquid cooling circulation loop 220, and the primary pipeline 221 is directly connected to the water pump output port of the liquid cooling unit 240. The liquid cooling unit 240 pumps the coolant directly to the primary pipeline 221 and transports it to each secondary pipeline 222 through the primary pipeline 221.

[0093] The secondary pipeline 222 is a branch of the primary pipeline 221. Each primary pipeline 221 is connected to a plurality of secondary pipelines 222 in parallel. Each secondary pipeline 222 is connected to a battery cluster, which includes a plurality of battery packs 210. The secondary pipeline 222 is used to transport the coolant to the connected battery packs 210. A switch unit 250 is provided on each secondary pipeline 222. These switch units 250 are remotely controlled by the controller 230 to control the flow direction and flow rate of the coolant in the secondary pipeline 222.

[0094] The battery line 223 is a coolant line of the battery pack 210 connected to the secondary line 222, and the battery line 223 includes a connecting line 213, a first branch 2231 connected to the first water inlet 2111 and the secondary line 222, and a second branch 2232 connected to the second water outlet 2122 and the secondary line 222. In this embodiment, each battery cluster is connected to two secondary lines 222, wherein the first branch 2231 of the battery line 223 is connected to one of the two secondary lines 222, and the second branch 2232 of the battery line 223 is connected to the other of the two secondary lines 222. In this way, the length of the battery line 223 can be extended, the time the coolant stays in the battery pack 210 can be extended, and the heat exchange time between the coolant and the battery modules in the battery pack 210 can be increased, which is beneficial to improving the cooling efficiency.

[0095] The switch unit 250 is disposed on the secondary pipeline 222 . The switch unit 250 may be a valve for controlling the flow of the coolant. The switch unit 250 may control the conduction of the coolant in the entire secondary pipeline 222 and the flow rate of the coolant in the secondary pipeline 222 .

[0096] The controller 230 is controlled and connected to the switch unit 250 on each secondary pipeline 222. The controller 230 can adjust the state of the switch unit 250 (whether the switch unit 250 is on or off and the flow rate of the switch unit 250) in real time according to the temperature requirements and cooling strategy of the battery pack 210.

[0097] In some embodiments, the detection unit 214 of the battery pack 210 is also used to detect the resistance and voltage of the battery module of the battery pack 210; when the resistance or voltage of the battery module of the battery pack 210 is abnormal, the controller 230 disconnects the switch unit 250 on the secondary pipeline 222 connected to the battery pack 210.

[0098] The detection unit 214 of the battery pack 210 further includes a resistance detection device and a voltage detection device.

[0099] The resistance detection device is used to detect the resistance change of the battery module in the battery pack 210, and convert the current internal resistance of the battery module into an electrical signal and transmit it to the controller 230. The controller 230 can identify problems such as short circuit, open circuit or poor contact in the battery module based on the current internal resistance of the battery module sent by the resistance detection device, and can also identify the aging degree and internal connection status of the battery.

[0100] The voltage detection device is used to detect the voltage change of the battery module in the battery pack 210 and transmit the current voltage of the battery module to the controller 230. The voltage of the battery module is one of the key indicators to measure the energy storage capacity and working status of the battery pack 210. The stability of the voltage of the battery module is directly related to the performance and safety of the battery pack 210. The controller 230 can determine the voltage change of the battery module based on the current voltage sent by the voltage detection device, and timely discover problems such as overcharging, over-discharging, and voltage imbalance of the battery module.

[0101] According to the current internal resistance and current voltage of the battery pack 210, the controller 230 can timely detect abnormal fluctuations in the performance of the battery module, so as to take measures in advance to avoid the occurrence of potential faults. When the current internal resistance or current voltage of the battery pack 210 fluctuates abnormally, the controller 230 determines that the battery pack 210 is a problematic battery pack 210, and the controller 230 takes protective measures for the problematic battery pack 210. The controller 230 controls the switch unit 250 on the secondary pipeline 222 connected to the problematic battery pack 210 to be closed, so as to prevent the coolant in the problematic battery pack 210 from participating in the coolant circulation of the liquid cooling circulation loop 220, and to prevent the abnormal problem of the problematic battery pack 210 from spreading and affecting other battery packs 210, thereby significantly reducing the risk of safety accidents. At the same time, the switch unit 250 disconnects the secondary pipeline 222 connected to the problematic battery pack 210, so as to facilitate solving the problem for the problematic battery pack 210, without shutting down the entire energy storage system, and can quickly locate and repair the fault, reduce maintenance costs, improve maintenance efficiency, reduce system downtime caused by faults, and improve the reliability of the entire energy storage system.

[0102] After the abnormal problem of the problematic battery pack 210 is solved, the controller 230 controls the switch unit 250 on the secondary pipeline 222 to open, so that the coolant channel of the secondary pipeline 222 is conductive, so that the entire battery cluster connected to the secondary pipeline 222 can participate in the charging and discharging of the energy storage system, and the battery packs 210 of the entire battery cluster participate in the coolant circulation of the liquid cooling circulation loop 220.

[0103] In some embodiments, the submerged energy storage system further includes an alarm module. When the controller 230 detects that the parameter information of the battery pack 210 (temperature, internal resistance or voltage of the battery module) is abnormal and determines that the battery pack 210 is a problem battery pack 210, the controller 230 triggers the alarm module to send an alarm and sends the information of the problem battery pack 210 to the alarm module to indicate the location and abnormality of the problem battery to the alarm module, so as to locate the location of the problem battery pack 210 and repair the fault of the problem battery pack 210, thereby reducing maintenance costs and improving maintenance efficiency.

[0104] According to an exemplary embodiment, this embodiment provides a liquid cooling control method for an immersion energy storage system. This embodiment uses the method applied to a terminal as an example, wherein the terminal may be, but is not limited to, a personal computer, a laptop computer, a smart phone, a tablet computer, an Internet of Things device, and a portable wearable device. The Internet of Things device may be a smart speaker, a smart TV, a smart air conditioner, a smart vehicle-mounted device, a projection device, and the like. Portable wearable devices may be smart watches, smart bracelets, head-mounted devices, and the like. Head-mounted devices may be virtual reality (VR) devices, augmented reality (AR) devices, smart glasses, and the like. It is understandable that the method may also be applied to a server, and may also be applied to a system including a terminal and a server, and may be implemented through the interaction between the terminal and the server. In this embodiment, an immersion energy storage system is deployed on the terminal, such as Figure 1-Figure 6As shown, the submerged energy storage system includes at least one battery pack 210, a liquid cooling circulation loop 220 and a controller 230; at least one battery pack 210 includes a box 211, a liquid cooling plate 212, a connecting pipe 213, a detection unit 214 and an adjustment unit 215; a battery module is arranged in the box 211, and the battery module is immersed in the coolant. The side wall of the box 211 is provided with a first water inlet 2111 and a first water outlet 2112, and the first water inlet 2111 is connected to the liquid cooling circulation loop 220; the liquid cooling plate 212 is arranged on the outside of the box 211, and the liquid cooling plate 212 has a second water inlet 2121 and a second water outlet 2122, and the second water outlet 2122 is connected to the liquid cooling circulation loop 220; the connecting pipe The connection line 213 is used to connect the first water outlet 2112 of the box body 211 and the second water inlet 2121 of the liquid cooling plate 212, and is connected to the liquid cooling circulation loop 220; the detection unit 214 is installed in the battery pack 210, and is at least used to detect the battery cell temperature of the battery module; the adjustment unit 215 is arranged in the connecting line 213, and is used to adjust the conduction state of the connecting line 213 and the cooling mode of the battery pack 210; wherein the controller 230 is respectively connected to the detection unit 214 and the adjustment unit 215 of the battery pack 210 in communication, and the controller 230 is used to match the current cooling mode for the battery pack 210 according to the battery cell temperature of the battery module, and control the adjustment unit 215 to make the battery pack 210 in the current cooling mode. Figure 7 As shown, the liquid cooling control method includes steps S101 to S103, wherein:

[0105] Step S101 : obtaining parameter information of the battery modules in the battery pack 210 and temperature information of the liquid cooling circulation loop 220 .

[0106] In this embodiment, the terminal obtains parameter information of the battery module in the battery pack 210. The parameter information of the battery module may include information on parameters such as the cell temperature, voltage internal resistance, etc. of the battery module in the battery pack 210. The parameter information of the battery module is collected by the detection unit 214 installed in the battery pack 210 and is currently transmitted to the terminal. The terminal obtains the temperature information of the liquid cooling circulation loop 220, which means that the terminal obtains the temperature of the coolant pumped by the liquid cooling unit 240 to the liquid cooling circulation loop 220. The temperature information of the liquid cooling circulation loop 220 is collected by the temperature detection module set in the liquid cooling unit 240 and transmitted to the terminal.

[0107] Step S102 : Determine the current cooling mode and current cooling level of the battery pack 210 according to the parameter information of the battery modules in the battery pack 210 and the temperature information of the liquid cooling circulation loop 220 .

[0108] In this embodiment, the terminal determines the heat dissipation effect and cooling requirements of the battery pack 210 based on the parameter information of the battery module in the battery pack 210 and the temperature information of the liquid cooling circulation loop 220, and matches the battery pack 210 with a suitable current cooling mode and current cooling level.

[0109] The cooling mode strategy may be a mathematical model or algorithm developed based on the characteristics of the battery module, the working environment, and the heat dissipation requirements. The cooling mode strategy may be stored in the terminal or an external database. When the terminal determines the current cooling mode of the battery pack 210, the terminal retrieves the cooling mode strategy. The terminal may match the current cooling mode in the cooling mode strategy according to the parameter information of the battery module in the battery pack 210.

[0110] The cooling level strategy can be a mathematical model or algorithm developed based on the characteristics of the battery module, the working environment, and the heat dissipation requirements. The cooling level strategy can be stored in the terminal or an external database. After the terminal determines the current cooling mode of the battery pack 210, the terminal retrieves the cooling level strategy. The terminal can match the current cooling level in the cooling level strategy according to the parameter information of the battery module and the temperature information of the liquid cooling circulation loop 220.

[0111] Step S103: adjusting the cooling mode of the battery pack 210 to the current cooling mode, and adjusting the cooling level of the battery pack 210 to the current cooling level.

[0112] In this embodiment, after the terminal matches the current cooling mode and the current cooling level for the battery pack 210, the terminal determines whether the cooling mode currently running in the battery pack 210 is the current cooling mode. If not, the terminal controls the controller 230 of the immersion energy storage system, and the controller 230 controls the adjustment unit 215 to control the flow path of the coolant to adjust the cooling mode of the battery pack 210 to the current cooling mode.

[0113] If not, the terminal does not adjust the cooling mode of the battery pack 210 , and the terminal continues to determine whether the cooling level currently running on the battery pack 210 is the current cooling level.

[0114] If yes, the terminal does not adjust the cooling level of the battery pack 210. If no, the terminal controls the controller 230 of the immersion energy storage system, and the controller 230 controls the regulating unit 215 to control the flow rate of the coolant to adjust the cooling level of the battery pack 210 to the current cooling level.

[0115] In the liquid cooling control method for the above-mentioned immersion energy storage system, the terminal obtains the parameter information of the battery module in the battery pack 210 and the temperature information of the liquid cooling circulation loop 220, determines the current cooling mode and the current cooling level of the battery pack 210 according to the parameter information of the battery module in the battery pack 210 and the temperature information of the liquid cooling circulation loop 220, adjusts the cooling mode of the battery pack 210 to the current cooling mode, and adjusts the cooling level of the battery pack 210 to the current cooling level, so that the current cooling mode and the current cooling level of the battery pack 210 match the current operating state of the battery pack 210, thereby improving the flexibility of the cooling operation of the immersion energy storage system and facilitating reducing power consumption.

[0116] In some embodiments, the parameter information of the battery module in the battery pack 210 includes the cell temperature of the battery module; according to the parameter information of the battery module in the battery pack 210 and the temperature information of the liquid cooling circulation loop 220. Step S102 determines the current cooling mode and the current cooling level of the battery pack 210, including steps S1021-S1026:

[0117] Step S1021: determine whether the battery cell temperature is within a first temperature range.

[0118] In this embodiment, the parameter information of the battery module obtained by the terminal includes the cell temperature of the battery module. Multiple groups of battery modules may be set in each battery pack 210, each group of battery modules may include multiple cells, and the cell temperature of the battery module may include the current temperature of multiple cells. The terminal obtains the maximum temperature value among the current temperatures of the multiple cells, and determines whether the maximum temperature value among the current temperatures of the cells is within the first temperature range.

[0119] The first temperature range is the optimal operating temperature range of the battery cell. When the battery cell is in the first temperature range, the chemical reaction inside the battery cell will be more stable, so that the electric energy can be stored and released more effectively. In addition, the first temperature range also helps to reduce the thermal stress inside the battery cell and reduce the risk of damage to the battery cell due to overheating.

[0120] The terminal may use an algorithm model (such as machine learning, deep learning, etc.) to analyze the historical data of the battery pack 210 operation, and set the first temperature range according to the output result of the algorithm model. The first temperature range may also be set by the user.

[0121] Step S1022 : when the battery cell temperature is in the first temperature range, matching the current cooling mode of the battery pack 210 to the cold plate mode.

[0122] In this embodiment, the terminal determines whether the battery cell temperature is within the first temperature range, and if the determination result is yes, the terminal matches the current cooling mode of the battery pack 210 to the cold plate mode according to the cooling mode strategy.

[0123] Among them, when the cooling mode of the battery pack 210 is the cold plate mode, the connecting pipe 213 disconnects the cooling liquid channel of the first water outlet 2112 of the box body 211 and the second water inlet 2121 of the liquid cooling plate 212, and connects the second water inlet 2121 of the liquid cooling plate 212 and the cooling liquid channel of the liquid cooling circulation loop 220. The liquid cooling plate 212 enters the liquid cooling plate 212 through the liquid cooling circulation loop 220 and then is output back to the liquid cooling circulation loop 220 for circulation.

[0124] In this embodiment, in step S103, when the terminal determines whether the cooling mode currently running in the battery pack 210 is the cold plate mode, if yes, the cooling mode of the battery pack 210 is not adjusted. If not, the terminal controls the controller 230 of the immersion energy storage system, so that the controller 230 controls the regulating unit 215 to adjust the flow path of the coolant of the connecting pipe 213, and the connecting pipe 213 disconnects the cooling liquid channel of the first water outlet 2112 of the box 211 and the second water inlet 2121 of the liquid cooling plate 212, and connects the second water inlet 2121 of the liquid cooling plate 212 and the cooling liquid channel of the liquid cooling circulation loop 220, so that the battery pack 210 runs the cold plate mode.

[0125] Step S1023 : matching the current cooling level of the cold plate mode for the battery pack 210 according to the temperature level of the battery cell temperature in the first temperature range.

[0126] In this embodiment, the terminal determines the temperature level of the battery cell temperature in the first temperature interval. It can be understood that the first temperature interval may include multiple temperature levels (level 1, level 2, level 3, etc.), and the temperature of each temperature level increases in sequence. The terminal matches the temperature level of the battery cell temperature in the first temperature interval according to the maximum temperature value among the current temperatures of the multiple battery cells in the battery pack 210. The temperature level strategy is searched according to the temperature level of the battery cell temperature in the first temperature interval to match the current cooling level of the cold plate mode for the battery pack 210.

[0127] The temperature level strategy stores the corresponding relationship between the temperature level in the first temperature range and the cooling level (level 1, level 2, level 3, etc.) of the cold plate mode. The current cooling level of the battery pack 210 can be found according to the temperature level of the battery cell temperature in the first temperature range. For example, if the temperature level of the battery cell temperature in the first temperature range is level 1, the current cooling level of the battery pack 210 matching the cold plate mode is also level 1.

[0128] Step S1024: when the battery cell temperature is not within the first temperature range, determining whether the battery cell temperature is within the second temperature range.

[0129] In this embodiment, in step S1022, the terminal determines whether the battery cell temperature is within the first temperature range. If the determination result is no, the terminal continues to determine whether the battery cell temperature is within the second temperature range.

[0130] Among them, the second temperature range is higher than the first temperature range but lower than the abnormal temperature. When the battery cell is in the second temperature range, the chemical reaction inside the battery cell will be adversely affected, but it can still store and release electrical energy.

[0131] The terminal may use an algorithm model (such as machine learning, deep learning, etc.) to analyze the historical data of the battery pack 210 operation, and set the second temperature range according to the output result of the algorithm model. The second temperature range may also be set by the user.

[0132] Step S1025: When the battery cell temperature is in the second temperature range, the battery pack 210 is matched with a current commutation mode at the current cooling level.

[0133] In this embodiment, the terminal determines whether the battery cell temperature is within the second temperature range, and if the determination result is yes, the terminal matches the current cooling mode of the battery pack 210 to the commutation mode according to the cooling mode strategy.

[0134] When the cooling mode of the battery pack 210 is the commutation mode, the connecting pipe 213 connects the cooling liquid channel of the first water outlet 2112 of the box body 211 and the second water inlet 2121 of the liquid cooling plate 212, and disconnects the cooling liquid channel of the second water inlet 2121 of the liquid cooling plate 212 and the liquid cooling circulation loop 220. The cooling liquid enters the box body 211 and the liquid cooling plate 212 through the liquid cooling circulation loop 220 and is then output to the liquid cooling circulation loop 220 for circulation.

[0135] In this embodiment, in step S103, when the terminal determines whether the cooling mode currently running in the battery pack 210 is the commutation mode, if yes, the cooling mode of the battery pack 210 is not adjusted. If not, the terminal controls the controller 230 of the immersion energy storage system, so that the controller 230 controls the regulating unit 215 to adjust the flow path of the coolant of the connecting pipe 213, the connecting pipe 213 conducts the cooling liquid channel of the first water outlet 2112 of the box 211 and the second water inlet 2121 of the liquid cooling plate 212, and disconnects the second water inlet 2121 of the liquid cooling plate 212 and the cooling liquid channel of the liquid cooling circulation loop 220, so that the battery pack 210 runs in the commutation mode.

[0136] Step S1026: Match the current cooling level of the commutation mode for the battery pack 210 according to the temperature level of the battery cell in the second temperature range.

[0137] In this embodiment, the terminal determines the temperature level of the battery cell temperature in the second temperature interval. It can be understood that the second temperature interval may include multiple temperature levels (level 1, level 2, level 3, etc.), and the temperature of each temperature level increases in sequence. The terminal matches the temperature level of the battery cell temperature in the second temperature interval according to the maximum temperature value among the current temperatures of the multiple battery cells in the battery pack 210. The temperature level strategy is searched according to the temperature level of the battery cell temperature in the second temperature interval to match the current cooling level of the commutation mode for the battery pack 210.

[0138] The temperature level strategy stores the correspondence between the temperature level in the second temperature range and the cooling level (level 1, level 2, level 3, etc.) of the commutation mode, and the current cooling level of the battery pack 210 can be found according to the temperature level of the battery cell temperature in the second temperature range. For example, if the temperature level of the battery cell temperature in the second temperature range is level 1, then the current cooling level of the battery pack 210 matching the commutation mode is also level 1.

[0139] In the liquid cooling control method of the immersion energy storage system of this embodiment, the terminal controls the cooling mode of the battery pack 210 according to the battery cell temperature of the battery module in the battery pack 210. The cold plate mode is applicable to the first temperature range when the battery module temperature is relatively low, and the battery module in the box 211 is cooled by circulating the coolant in the liquid cold plate 212. The commutation mode is applicable to the battery module when there are high-temperature batteries in the battery module, and the battery cells with abnormal temperatures in the box 211 are quickly cooled by circulating the coolant in the commutation box 211. The commutation mode is applicable to the first temperature range when the battery module temperature is relatively high, and the battery module is quickly responded to. The temperature of the battery pack increases, and the flow path of the coolant is changed to more effectively reduce the temperature of the battery cells and prevent overheating of the battery; the terminal intelligently adjusts the cooling mode of the battery pack 210 according to the temperature of the battery cells of the battery module, and timely cools the battery cells in the battery pack 210 according to the cooling requirements of the battery cells, which can timely avoid the risk of thermal runaway of the battery pack 210, which is beneficial to improving the working efficiency of the battery pack 210. At the same time, it can also improve the energy waste caused by untimely cooling or excessive cooling caused by a single cooling mode, which is beneficial to reduce the redundant power consumption of the immersion energy storage system in performing temperature control on the battery pack 210, thereby saving costs.

[0140] In some embodiments, the parameter information of the battery modules in the battery pack 210 also includes the resistance and voltage of the battery modules of the battery pack 210; step S102 also includes steps S1027 to S1029 executed after step S1026:

[0141] Step S1027: when the battery cell temperature is not within the second temperature range, determining whether the battery cell temperature is within the third temperature range.

[0142] In this embodiment, in step S1024, the terminal determines whether the battery cell temperature is within the second temperature range. If the determination result is no, the terminal continues to determine whether the battery cell temperature is within the third temperature range.

[0143] The third temperature range is higher than the second temperature range and is an abnormal temperature range. When the battery cell is in the third temperature range, it means that the temperature of the battery cell has exceeded the normal operating range and may face overheating. This overheating state may have an adverse effect on the performance, safety and life of the battery cell, and the battery pack 210 faces the risk of thermal runaway.

[0144] The terminal may use an algorithm model (such as machine learning, deep learning, etc.) to analyze the historical data of the battery pack 210 operation, and set the third temperature interval according to the output result of the algorithm model. The third temperature interval may also be set by the user.

[0145] Step S1028: When the battery cell temperature is within the third temperature range, determining whether the resistance or voltage of the battery module exceeds a preset threshold range.

[0146] In this embodiment, when the terminal determines that the temperature of the battery cell is in the third temperature range, it continues to determine whether the resistance or voltage of the battery module exceeds a preset threshold range.

[0147] The terminal may use an algorithm model (such as machine learning, deep learning, etc.) to analyze the historical data of the battery pack 210 operation, and set the preset threshold range of the resistance or voltage of the battery module according to the output result of the algorithm model. The preset threshold range of the resistance or voltage of the battery module may also be set by the user.

[0148] Step S1029: When the resistance or voltage of the battery module exceeds a preset threshold range, disconnect the secondary pipeline connected to the battery pack 210.

[0149] In this embodiment, if the terminal determines that one or both of the current voltage or current resistance of the battery module exceeds the preset threshold range, the terminal determines that the battery pack 210 is a problematic battery pack 210, and takes protective measures for the problematic battery pack 210. The terminal controls the switch unit 250 on the secondary pipeline connected to the problematic battery pack 210 to be closed through the controller 230, so as to prevent the coolant in the problematic battery pack 210 from participating in the coolant circulation of the liquid cooling circulation loop 220, and to prevent the abnormal problem of the problematic battery pack 210 from spreading and affecting other battery packs 210, thereby significantly reducing the risk of safety accidents. At the same time, disconnecting the secondary pipeline connected to the problematic battery pack 210 facilitates solving the problem for the problematic battery pack 210, without shutting down the entire energy storage system, and can quickly locate and repair the fault, reduce maintenance costs, improve maintenance efficiency, reduce system downtime caused by faults, and improve the reliability of the entire energy storage system.

[0150] After the abnormal problem of the problematic battery pack 210 is solved, the controller 230 controls the switch unit 250 on the secondary pipeline to open so that the coolant channel of the secondary pipeline is conductive, so that the entire cluster of batteries connected by the secondary pipeline can participate in the charging and discharging of the energy storage system, and the battery packs 210 of the entire cluster of batteries participate in the coolant circulation of the liquid cooling circulation loop 220.

[0151] In some embodiments, when the battery cell temperature is within the third temperature range in step S1028, the terminal further executes step S1028-1: adjusting the cooling mode of the battery pack 210 to a mixed mode.

[0152] In this embodiment, the terminal determines whether the temperature of the battery cell is within the third temperature range. If the judgment result is yes, the terminal directly controls the controller 230 of the immersion energy storage system. The controller 230 controls the regulating unit 215 to adjust the flow path of the coolant in the connecting pipe 213. The connecting pipe 213 conducts the coolant channel of the liquid cooling circulation loop 220 of the box 211, and at the same time conducts the second water inlet 2121 of the liquid cooling plate 212 and the coolant channel of the liquid cooling circulation loop 220, so that the battery pack 210 operates in a mixed mode. The coolant in the box 211 enters the liquid cooling plate 212 through the liquid cooling circulation loop 220 and then outputs back to the liquid cooling circulation loop 220 for circulation. At the same time, the liquid cooling plate 212 enters the liquid cooling plate 212 through the liquid cooling circulation loop 220 and then outputs back to the liquid cooling circulation loop 220 for circulation. Part of the cooling liquid in the liquid cooling circulation loop 220 enters the box body 211 through the first water inlet 2111 of the box body 211, and the cooling liquid in the box body 211 enters the liquid cooling circulation loop 220 through the first water outlet 2112 to participate in the cooling liquid circulation, so that the temperature of the cooling liquid in the box body 211 is quickly reduced, so that the cold battery module of the box body 211 can be immersed in the cooling liquid with lower temperature, so as to quickly cool down the battery cells of the battery module. At the same time, part of the coolant in the liquid cooling circulation loop 220 enters the liquid cooling plate 212 through the second water inlet 2121 of the liquid cooling plate 212, and the coolant flows back to the liquid cooling circulation loop 220 through the second water outlet 2122 of the liquid cooling plate 212 to participate in the coolant circulation, so that the temperature of the coolant flowing in the liquid cooling plate 212 is lower, and part of the heat of the box 211 is taken away by the flow of coolant in the liquid cooling plate 212 to cool the box 211, so that the temperature of the battery cell drops rapidly, avoiding the risk of thermal runaway of the battery pack 210, which is beneficial to improving the working efficiency of the battery pack 210.

[0153] It should be understood that, although the steps in the flowcharts involved in the above embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0154] Based on the same inventive concept, the embodiment of the present disclosure also provides a computer device for implementing the liquid cooling control method involved above. The computer device may be a terminal, and its internal structure diagram may be as shown in FIG. Figure 8 As shown. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, near field communication (NFC) or other technologies. When the computer program is executed by the processor, a liquid cooling control method is implemented. The display unit of the computer device is used to form a visually visible picture, which can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device shell, or an external keyboard, touchpad or mouse.

[0155] Those skilled in the art will understand that Figure 8 The structure shown in the figure is only a block diagram of a part of the structure related to the scheme of the present disclosure, and does not constitute a limitation on the computer device to which the scheme of the present disclosure is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0156] In one embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above method embodiments when executing the computer program.

[0157] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0158] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0159] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this disclosure are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0160] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided by the present disclosure can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magneto resistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM).

[0161] The database involved in each embodiment provided by the present disclosure may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided by the present disclosure may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, an artificial intelligence (AI) processor, etc., but is not limited thereto.

[0162] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features of the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0163] The above-described embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the patent of the present disclosure shall be subject to the attached claims.

Claims

1. An immersion energy storage system, characterized in that: Includes at least one battery pack, a liquid cooling circulation loop and a controller; At least one of the battery packs comprises: A box body, wherein a battery module is arranged in the box body, and the battery module is immersed in a coolant. A first water inlet and a first water outlet are arranged on a side wall of the box body, and the first water inlet is connected to the liquid cooling circulation loop; A liquid cooling plate, arranged on the outer side of the box, the liquid cooling plate having a second water inlet and a second water outlet, the second water outlet being connected to the liquid cooling circulation loop; A connecting pipeline is used to connect the first water outlet of the box body and the second water inlet of the liquid cooling plate, and is connected to the liquid cooling circulation loop; A detection unit, installed in the battery pack, at least used to detect the temperature of the battery cell of the battery module; an adjusting unit, provided in the connecting pipeline, for adjusting the conduction state of the connecting pipeline and the cooling mode of the battery pack; Among them, the controller is communicatively connected with the detection unit and the adjustment unit of the battery pack respectively, and the controller is used to match the current cooling mode for the battery pack according to the cell temperature of the battery module, and control the adjustment unit to make the battery pack in the current cooling mode.

2. The submerged energy storage system according to claim 1, characterized in that: The cooling modes of the battery pack include a cold plate mode and a commutation mode; When the cooling mode of the battery pack is the cold plate mode, the connecting pipeline disconnects the cooling liquid channel between the first water outlet of the box and the second water inlet of the liquid cooling plate, connects the second water inlet of the liquid cooling plate and the cooling liquid channel of the liquid cooling circulation loop, and the liquid cooling plate enters the liquid cooling plate through the liquid cooling circulation loop and then outputs back to the liquid cooling circulation loop for circulation; When the cooling mode of the battery pack is the commutation mode, the connecting pipeline connects the cooling liquid channel of the first water outlet of the box and the second water inlet of the liquid cooling plate, disconnects the second water inlet of the liquid cooling plate and the cooling liquid channel of the liquid cooling circulation loop, and the cooling liquid enters the box and the liquid cooling plate through the liquid cooling circulation loop and is then output to circulate in the liquid cooling circulation loop.

3. The submerged energy storage system according to claim 2, characterized in that: The first water outlet is provided on a first side wall of the box body, and the first water inlet is provided on a second side wall opposite to the first side wall; The liquid cooling plate is a plate body attached to the bottom wall of the box body, the second water inlet is provided at the first end of the liquid cooling plate, and the second water outlet is provided at the second end of the liquid cooling plate; Wherein, the first side wall is arranged on the same side as the first end of the liquid cooling plate, and the second side wall is arranged on the same side as the second end of the liquid cooling plate; in the flow conversion mode, the coolant flows along the first water inlet, the first water outlet, the second water inlet and the second water outlet.

4. The submerged energy storage system according to claim 1, characterized in that: Also includes: A liquid cooling unit, the liquid cooling unit is used to deliver the coolant to the battery pack through the liquid cooling circulation loop; the liquid cooling unit is provided with a temperature detection module, the temperature detection module is used to detect the temperature of the coolant output by the liquid cooling unit; The controller is communicatively connected to the temperature detection module of the liquid cooling unit, and is also used to match the current cooling level for the battery pack according to the cell temperature of the battery module and the temperature of the coolant output by the liquid cooling unit, and control the adjustment unit to keep the battery pack at the current cooling level.

5. The submerged energy storage system according to claim 4, characterized in that: The liquid cooling circulation loop includes a primary pipeline, a secondary pipeline and a battery pipeline, the primary pipeline is connected to the liquid cooling unit, the primary pipeline is connected to a plurality of the secondary pipelines; each of the secondary pipelines is connected to a plurality of the battery packs, the battery packs are connected to the secondary pipelines through the battery pipeline, and the battery pipeline includes the connecting pipeline; The secondary pipeline is provided with a switch unit, and the controller is control-connected with the switch unit.

6. The submerged energy storage system according to claim 5, characterized in that: The detection unit of the battery pack is also used to detect the resistance and voltage of the battery module of the battery pack; When the resistance or voltage of the battery module of the battery pack is abnormal, the controller disconnects the switch unit on the secondary pipeline connected to the battery pack.

7. The submerged energy storage system according to claim 1, characterized in that: The regulating unit of the battery pack includes a three-way valve.

8. A liquid cooling control method for an immersion energy storage system, characterized in that: The liquid cooling control method comprises: Obtain parameter information of the battery module in the battery pack and temperature information of the liquid cooling circulation loop; Determining a current cooling mode and a current cooling level of the battery pack according to parameter information of a battery module in the battery pack and temperature information of the liquid cooling circulation loop; The cooling mode of the battery pack is adjusted to the current cooling mode, and the cooling level of the battery pack is adjusted to the current cooling level.

9. The liquid cooling control method for an immersion energy storage system according to claim 8, characterized in that: The parameter information of the battery module in the battery pack includes the cell temperature of the battery module; and determining the current cooling mode and the current cooling level of the battery pack according to the parameter information of the battery module in the battery pack and the temperature information of the liquid cooling circulation loop includes: Determining whether the battery core temperature is within a first temperature range; When the battery cell temperature is within the first temperature range, matching the current cooling mode of the battery pack to a cold plate mode; According to the temperature level of the battery cell temperature in the first temperature range, matching the battery pack with the current cooling level of the cold plate mode; When the battery core temperature is not within the first temperature range, determining whether the battery core temperature is within a second temperature range; When the battery cell temperature is within the second temperature range, matching the current cooling mode of the battery pack to a commutation mode; According to the temperature level of the battery cell temperature in the second temperature range, the battery pack is matched with a current cooling level of the commutation mode.

10. The liquid cooling control method for an immersion energy storage system according to claim 9, characterized in that: The parameter information of the battery module in the battery pack also includes the resistance and voltage of the battery module in the battery pack; the control method also includes: When the battery core temperature is not within the second temperature range, determining whether the battery core temperature is within a third temperature range; When the battery cell temperature is within the third temperature range, determining whether the resistance or voltage of the battery module exceeds a preset threshold range; When the resistance or voltage of the battery module exceeds the preset threshold range, the secondary pipeline connected to the battery pack is disconnected.

Images