CN116799372A

CN116799372A - Liquid cooling device, liquid cooling device control method and energy storage system

Info

Publication number: CN116799372A
Application number: CN202311082011.4A
Authority: CN
Inventors: 黄寿涛
Original assignee: Shenzhen Haichen Energy Storage Control Technology Co ltd; Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Shenzhen Haichen Energy Storage Control Technology Co ltd; Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2023-08-26
Filing date: 2023-08-26
Publication date: 2023-09-22
Anticipated expiration: 2043-08-26
Also published as: CN116799372B

Abstract

A liquid cooling device, a liquid cooling device control method and an energy storage system, wherein the liquid cooling device comprises a liquid cooling unit; the to-be-cooled assembly comprises a first to-be-cooled piece positioned on the first side and a second to-be-cooled piece positioned on the second side; the pipeline group comprises a first pipe group and a second pipe group, the first pipe group is used for connecting the liquid cooling unit and a first piece to be cooled, and the second pipe group is used for connecting the liquid cooling unit and a second piece to be cooled; a first regulating valve mounted to the first pipe group and the second pipe group, the first regulating valve being for regulating flow rates of the first pipe group and the second pipe group; and the control part is in communication connection with the first regulating valve and is used for controlling the opening degree of the first regulating valve so as to enable the first pipe group and the second pipe group to be communicated alternately. Through the arrangement, the first pipe group and the second pipe group are alternately communicated, so that cooling liquid can be concentrated on one side, the heat dissipation efficiency is increased, the running power of the liquid cooling device is greatly reduced, and the energy consumption of the liquid cooling device is reduced on the premise of meeting the heat dissipation requirement.

Description

Liquid cooling device, liquid cooling device control method and energy storage system

Technical Field

The invention relates to the technical field of liquid cooling and heat dissipation, in particular to a liquid cooling device, a liquid cooling device control method and an energy storage system.

Background

The battery cells in the energy storage device need to be in a proper operating temperature range to ensure the safety and reliability thereof. The battery cell can generate certain heat in the charge and discharge process, so that the battery cell can work in a proper working temperature range for cooling the battery cell, and a liquid cooling device is often adopted for carrying out heat management on the battery cell.

The liquid cooling device in the prior art generally comprises a liquid cooling unit and a liquid cooling pipeline, wherein the electric core is provided with the liquid cooling plate, heat transfer can be realized between the liquid cooling plate and the electric core, the liquid cooling pipeline is connected with the liquid cooling unit and the liquid cooling plate, cooling liquid circularly flows between the liquid cooling plate and the liquid cooling unit through the liquid cooling pipeline, heat generated by the electric core is taken away, and the electric core is cooled. However, the larger the volume of the energy storage device, the higher the power requirement on the liquid cooling unit, so that the power consumption and the running cost of the liquid cooling device are increased, and the heat dissipation efficiency of the liquid cooling device is affected.

Disclosure of Invention

The invention aims to provide a liquid cooling device, a liquid cooling device control method and an energy storage system, which solve the technical problems of higher power consumption and operation cost of the liquid cooling device in the prior art.

In order to achieve the purpose of the invention, the invention provides the following technical scheme:

In a first aspect, the present invention provides a liquid cooling apparatus comprising:

a liquid cooling unit;

the to-be-cooled assembly comprises a first to-be-cooled piece positioned on the first side and a second to-be-cooled piece positioned on the second side;

the pipeline group comprises a first pipe group and a second pipe group, the first pipe group is used for communicating the liquid cooling unit and the first piece to be cooled, and the second pipe group is used for communicating the liquid cooling unit and the second piece to be cooled;

the first regulating valve is arranged on the first pipe group, the second regulating valve is arranged on the second pipe group, the first regulating valve is used for regulating the flow of the first pipe group, and the second regulating valve is used for regulating the flow of the second pipe group;

and the control part is in communication connection with the first regulating valve and the second regulating valve and is used for controlling the opening degrees of the first regulating valve and the second regulating valve so as to enable the communication between the first pipe group and the first piece to be cooled and the communication between the second pipe group and the second piece to be cooled to be alternately executed.

In a possible implementation manner, the first pipe group comprises a first primary liquid inlet pipe and a first primary liquid return pipe, the circulation direction of the first primary liquid inlet pipe is from the liquid cooling unit to the first to-be-cooled piece, and the circulation direction of the first primary liquid return pipe is from the first to-be-cooled piece to the liquid cooling unit;

The second pipe group comprises a second-stage liquid inlet pipe and a second-stage liquid return pipe, the circulation direction of the second-stage liquid inlet pipe is from the liquid cooling unit to the second to-be-cooled piece, and the circulation direction of the second-stage liquid return pipe is from the second to-be-cooled piece to the liquid cooling unit.

In a possible implementation manner, the first primary liquid inlet pipe and the first primary liquid return pipe are both provided with the first regulating valve, and the second primary liquid inlet pipe and the second primary liquid return pipe are both provided with the second regulating valve.

In a possible implementation manner, the first primary liquid inlet pipe and the first regulating valve on the first primary liquid return pipe are synchronously opened or closed, and the second primary liquid inlet pipe and the second regulating valve on the second primary liquid return pipe are synchronously opened or closed.

In a possible implementation manner, the first tube set further comprises a first secondary liquid inlet tube and a first secondary liquid return tube, the first secondary liquid inlet tube is communicated with the first primary liquid inlet tube, the first secondary liquid inlet tube is provided with a plurality of first liquid inlet branches, the plurality of first liquid inlet branches are communicated with the first to-be-cooled piece, the first secondary liquid return tube is communicated with the first primary liquid return tube, the first secondary liquid return tube is provided with a plurality of first liquid return branches, and the plurality of first liquid return branches are communicated with the first to-be-cooled piece;

The second pipe group further comprises a second-stage liquid inlet pipe and a second-stage liquid return pipe, the second-stage liquid inlet pipe is communicated with the second-stage liquid inlet pipe, the second-stage liquid inlet pipe is provided with a plurality of second liquid inlet branches, the second liquid inlet branches are communicated with the second cooling piece to be cooled, the second-stage liquid return pipe is communicated with the second-stage liquid return pipe, and the second-stage liquid return pipe is provided with a plurality of second liquid return branches, and the second liquid return branches are communicated with the second cooling piece to be cooled.

In a possible implementation manner, the number of the first secondary liquid inlet pipes and the number of the first secondary liquid return pipes are all multiple, the multiple first secondary liquid inlet pipes are distributed at intervals along the length direction of the first primary liquid inlet pipe, and the multiple first secondary liquid return pipes are distributed at intervals along the length direction of the first primary liquid return pipe;

the number of the second-stage liquid inlet pipes and the second-stage liquid return pipes is multiple, the second-stage liquid inlet pipes are distributed at intervals along the length direction of the second-stage liquid inlet pipes, and the second-stage liquid return pipes are distributed at intervals along the length direction of the second-stage liquid return pipes.

In a possible implementation manner, the first secondary liquid inlet pipe is detachably connected with the first primary liquid inlet pipe, the first secondary liquid return pipe is detachably connected with the first primary liquid return pipe, the second secondary liquid inlet pipe is detachably connected with the second primary liquid inlet pipe, and the second secondary liquid return pipe is detachably connected with the second primary liquid return pipe.

In a possible implementation manner, the liquid cooling device further includes a third adjusting valve, where the third adjusting valve is disposed on the first secondary liquid inlet pipe, the first secondary liquid return pipe, the second secondary liquid inlet pipe, and the second secondary liquid return pipe, and the third adjusting valve is used to adjust the opening degrees of the first secondary liquid inlet pipe, the first secondary liquid return pipe, the second secondary liquid inlet pipe, and the second secondary liquid return pipe.

In a second aspect, the present invention provides a liquid cooling device control method, which is applied to the liquid cooling device provided in any one embodiment of the first aspect, and the liquid cooling device control method includes:

acquiring temperature information and operation time of a component to be cooled, wherein the component to be cooled comprises a first component to be cooled positioned on a first side and a second component to be cooled positioned on a second side;

And adjusting the opening degrees of the first regulating valve and the second regulating valve according to the temperature information and the operation time of the component to be cooled so that the communication between the first pipe group and the first component to be cooled and the communication between the second pipe group and the second component to be cooled are alternately executed.

In a possible implementation manner, the opening degrees of the first adjusting valve and the second adjusting valve are controlled according to the temperature information and the operation time length of the component to be cooled, so that before the communication between the first pipe group and the first component to be cooled and the communication between the second pipe group and the second component to be cooled are alternately performed, the liquid cooling device control method further includes:

and controlling the first pipe group and the second pipe group to be communicated simultaneously.

In a possible implementation manner, the controlling the first tube set and the second tube set to be communicated simultaneously includes:

controlling the first pipe group and the second pipe group to be communicated simultaneously under the condition that the temperatures of the first to-be-cooled piece and the second to-be-cooled piece are both larger than a first preset temperature threshold value;

according to the temperature information and the operation time length of the component to be cooled, the opening degrees of the first regulating valve and the second regulating valve are regulated so that the communication between the first pipe group and the first component to be cooled and the communication between the second pipe group and the second component to be cooled are alternately executed, and the method comprises the following steps:

Controlling the opening degree of the first regulating valve to be gradually increased and controlling the opening degree of the second regulating valve to be gradually decreased under the condition that the temperature of at least one of the first to-be-cooled piece and the second to-be-cooled piece is smaller than or equal to the first preset temperature threshold value, so that the first to-be-cooled piece and the first pipe group are communicated within a first preset time period, and the second to-be-cooled piece and the second pipe group are closed within the first preset time period;

the first preset temperature threshold is a lower limit value of standard charge/discharge temperatures of the first to-be-cooled piece and the second to-be-cooled piece.

In a possible implementation manner, after controlling the opening of the first adjusting valve to gradually increase and controlling the opening of the second adjusting valve to gradually decrease, in a case that the temperature of at least one of the first to-be-cooled member and the second to-be-cooled member is less than or equal to the first preset temperature threshold value, the method further includes:

if the temperature of the second to-be-cooled piece is greater than or equal to a second preset temperature threshold value and the operation time length is less than a preset time length threshold value, controlling the opening degree of the first regulating valve to be gradually reduced and controlling the opening degree of the second regulating valve to be gradually increased so as to enable the first to-be-cooled piece and the first pipe group to be closed within the first preset time length and enable the second to-be-cooled piece and the second pipe group to be communicated within the first preset time length;

The second preset temperature threshold is greater than the first preset temperature threshold, and the second preset temperature threshold is a standard charging/discharging temperature upper limit value of the first to-be-cooled piece and the second to-be-cooled piece; the preset time period threshold is used for representing standard time period for the first to-be-cooled piece and the second to-be-cooled piece to rise from the first preset temperature threshold to the second preset temperature threshold.

if the temperature of the second piece to be cooled is smaller than a second preset temperature threshold value and the running time is larger than or equal to a preset time threshold value, controlling the opening of the first regulating valve to be gradually reduced and controlling the opening of the second regulating valve to be gradually increased so that the first piece to be cooled and the first pipe group are closed within the first preset time, and the second piece to be cooled and the second pipe group are communicated within the first preset time;

The second preset temperature threshold is greater than the first preset temperature threshold, and the second preset temperature threshold is a standard charging/discharging temperature upper limit value of the first to-be-cooled piece and the second to-be-cooled piece; the preset duration threshold is used for representing standard time for the first to-be-cooled piece and the second to-be-cooled piece to rise from the first preset temperature threshold to the second preset temperature threshold.

if the temperature of the second to-be-cooled piece is smaller than a second preset temperature threshold value and the operation time length is smaller than a preset time length threshold value, acquiring a temperature difference value between the first to-be-cooled piece and the second to-be-cooled piece;

if the temperature difference is larger than a preset temperature difference threshold, controlling the opening of the first regulating valve to be gradually reduced and controlling the opening of the second regulating valve to be gradually increased so as to enable the first piece to be cooled and the first pipe group to be closed within a second preset time period, and enabling the second piece to be cooled and the second pipe group to be communicated within the second preset time period;

The second preset temperature threshold is greater than the first preset temperature threshold, the second preset time period is longer than the first preset time period, and the second preset temperature threshold is the standard charging/discharging temperature upper limit value of the first to-be-cooled piece and the second to-be-cooled piece; the preset duration threshold is used for representing standard time for the first to-be-cooled piece and the second to-be-cooled piece to rise from the first preset temperature threshold to the second preset temperature threshold.

In a third aspect, the present application provides an energy storage system, including a liquid cooling device provided in any one of the embodiments of the first aspect, where the liquid cooling device is configured to cool the energy storage system.

According to the liquid cooling device, the liquid cooling device control method and the energy storage system, the opening degree of the first regulating valve and the opening degree of the second regulating valve are controlled through the control piece, so that the first pipe group and the second pipe group are alternately communicated, the first part to be cooled on the first side and the second part to be cooled on the second side are alternately cooled, single-side alternate heat dissipation is achieved, cooling liquid can be concentrated on the single side, heat dissipation efficiency is guaranteed, the same heat dissipation effect as that of the existing high-power liquid cooling device can be achieved on the basis of the low-power liquid cooling device by utilizing the mode that the single side is switched back and forth to conduct heat dissipation, the operation power and the energy consumption of the liquid cooling device are reduced by nearly half, the operation power of the liquid cooling device is greatly reduced on the basis of the mode, the operation cost of the liquid cooling device is reduced on the premise that the heat dissipation requirement is met, the operation cost of the liquid cooling device is saved, and the technical scheme of the application also guarantees the energy density of the whole energy storage system on the basis of reducing the production cost.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a liquid cooling apparatus according to an embodiment;

FIG. 2 is an enlarged view at A in FIG. 1;

FIG. 3 is an enlarged view at B in FIG. 1;

FIG. 4 is a schematic diagram of the piping set of one embodiment;

fig. 5 is an enlarged view at C in fig. 4;

fig. 6 is a flow chart of a method for controlling a liquid cooling apparatus according to an embodiment.

Reference numerals illustrate:

1-a liquid cooling unit; 2-a pipeline group; 21-a first tube set; 211-a first primary liquid inlet pipe; 212-a first primary liquid return pipe; 213-first secondary liquid inlet pipe; 2131-a first feed leg; 214-a first secondary liquid return pipe; 2141-a first liquid return leg; 22-a second tube set; 221-a second-stage liquid inlet pipe; 222-a second-stage liquid return pipe; 223-second stage liquid inlet pipe; 2231-a second feed leg; 224-second stage liquid return pipe; 2241-second liquid return branch; 31-a first regulating valve; 32-a second regulating valve; 4-a third regulating valve; 5-a liquid inlet main pipe; 6-a liquid return main pipe; 7-tee joint.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

Some embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.

As shown in fig. 1 to 5, an embodiment of the present invention provides a liquid cooling apparatus, which includes a liquid cooling unit 1, a component to be cooled, a pipe group 2, a first adjusting valve 31, a second adjusting valve 32, and a control member.

The liquid cooling unit 1 is used for cooling the cooling liquid, and the cooling liquid circularly flows between the liquid cooling unit 1 and the component to be cooled through the pipeline group 2, so that the cooling effect is realized.

The to-be-cooled assembly comprises a first to-be-cooled piece positioned on the first side and a second to-be-cooled piece positioned on the second side. The first side and the second side are two sides deviating from each other in a preset direction, for example, the preset direction is a horizontal direction, the first side and the second side deviate from each other in the horizontal direction, the first side is relatively located on the left side, and the second side is relatively located on the right side.

In one embodiment, the liquid cooling device is applied to an energy storage system, the energy storage system comprises a plurality of battery packs, a part of the battery packs are located on a first side, the other part of the battery packs are located on a second side, and each battery pack comprises a plurality of battery cells which are distributed at intervals along the vertical direction. The first to-be-cooled piece and the second to-be-cooled piece are battery packs, the battery packs further comprise a plurality of liquid cooling plates, the battery cores and the liquid cooling plates are arranged in a stacked mode, the battery cores are cooled through the liquid cooling plates, the temperature of the battery cores is in a proper working temperature range, and the liquid cooling plates are communicated with the pipeline group 2 of the liquid cooling device.

As shown in fig. 4, the pipe group 2 includes a first pipe group 21 for communicating the liquid-cooling unit 1 with the first member to be cooled and a second pipe group 22 for communicating the liquid-cooling unit 1 with the second member to be cooled. The first tube group 21 is for realizing a circulating flow of the cooling liquid between the liquid cooling unit 1 and the first member to be cooled, and the second tube group 22 is for realizing a circulating flow of the cooling liquid between the liquid cooling unit 1 and the second member to be cooled. Illustratively, the first tube bank 21 is in communication with the liquid cooling unit 1 and the liquid cooling plate of the battery pack located on the first side, respectively, and the second tube bank 22 is in communication with the liquid cooling unit 1 and the liquid cooling plate of the battery pack located on the second side, respectively.

The first regulating valve 31 is mounted to the first tube group 21, the second regulating valve 32 is mounted to the second tube group 22, the first regulating valve 31 is used for regulating the first tube group 21, and the second regulating valve 32 is used for regulating the flow rate of the second tube group 22. The first and second regulating valves 31 and 32 may be flow control valves such as electromagnetic throttle valves having different opening degrees and capable of adjusting flow rates, and the larger the opening degrees of the first and second regulating valves 31 and 32, the larger the flow rate of the coolant flowing through the first and second regulating valves 31 and 32. When the first regulating valve 31 or the second regulating valve 32 is in the minimum opening state, the coolant can be prevented from passing therethrough, and therefore the first regulating valve 31 and the second regulating valve 32 can control the on-off of the first tube group 21 and the second tube group 22.

The control member is communicatively connected to the first regulating valve 31 and the second regulating valve 32, and is configured to control the opening degrees of the first regulating valve 31 and the second regulating valve 32 so that the communication of the first tube group 21 with the first member to be cooled and the communication of the second tube group 22 with the second member to be cooled are alternately performed. Specifically, the control member sends a control command to the first regulating valve 31 and/or the second regulating valve 32, and the first regulating valve 31 and/or the second regulating valve 32, upon receiving the control command, correspondingly adjusts the opening degree thereof, thereby controlling the flow rates of the first tube group 21 and the second tube group 22. The alternate communication of the first tube group 21 and the second tube group 22 is embodied as: one of the first tube group 21 and the second tube group 22 is in a connected state and the other is in an off state in a period of time, and in another period of time later, the on-off state of the first tube group 21 and the second tube group 22 is switched, the tube group in the connected state previously is switched to the off state, and the tube group in the off state previously is switched to the connected state, and the circulation and alternation are sequentially performed, so that the liquid cooling unit 1 alternately cools the first part to be cooled and the second part to be cooled.

Optionally, the control member is a BMS (Battery Management System ) configured in the battery pack, which facilitates controlling the operation states of the first and second regulating valves 31 and 32 based on the real-time state of the battery pack.

According to the liquid cooling device provided by the embodiment of the application, the opening degree of the first regulating valve 31 and the opening degree of the second regulating valve 32 are controlled by the control piece, so that the first pipe group 21 and the second pipe group 22 are alternately communicated, the first part to be cooled and the second part to be cooled which are positioned on the first side are alternately cooled and cooled, single-side alternate heat dissipation is realized, cooling liquid can be concentrated on the single side, heat dissipation efficiency is ensured, the same heat dissipation effect as the existing high-power liquid cooling device can be realized on the basis of the low-power liquid cooling device by utilizing the mode of switching back and forth on the single side, the running power and the energy consumption of the liquid cooling device are saved by nearly half, the running power of the liquid cooling device is greatly reduced on the basis of the mode, the energy consumption of the liquid cooling device is reduced on the premise of meeting the heat dissipation requirement, the running cost of the liquid cooling device is saved, and the technical scheme of the application also ensures the energy density of the whole energy storage system on the basis of reducing the production cost.

Further, the first tube set 21 includes a first-stage liquid inlet tube 211 and a first-stage liquid return tube 212, the flow direction of the first-stage liquid inlet tube 211 is from the liquid cooling unit 1 to the first part to be cooled, and the flow direction of the first-stage liquid return tube 212 is from the first part to be cooled to the liquid cooling unit 1. The cooling liquid enters the first to-be-cooled piece from the liquid cooling unit 1 through the first primary liquid inlet pipe 211, and then enters the liquid cooling unit 1 from the first to-be-cooled piece through the first primary liquid return pipe 212, so that the cooling liquid circularly flows between the liquid cooling unit 1 and the first to-be-cooled piece.

The second tube set 22 includes a second-stage liquid inlet pipe 221 and a second-stage liquid return pipe 222, wherein the flow direction of the second-stage liquid inlet pipe 221 is from the liquid cooling unit 1 to the second piece to be cooled, and the flow direction of the second-stage liquid return pipe 222 is from the second piece to be cooled to the liquid cooling unit 1. The cooling liquid enters the second to-be-cooled piece from the liquid cooling unit 1 through the second primary liquid inlet pipe 221, and then enters the liquid cooling unit 1 from the second to-be-cooled piece through the second primary liquid return pipe 222, so that the cooling liquid circularly flows between the liquid cooling unit 1 and the second to-be-cooled piece.

As shown in fig. 5, the first-stage liquid inlet pipe 211, the first-stage liquid return pipe 212, the second-stage liquid inlet pipe 221 and the second-stage liquid return pipe 222 are all transversely arranged along the horizontal direction, the first-stage liquid inlet pipe 211 and the second-stage liquid inlet pipe 221 can be mutually communicated and are connected to the liquid outlet of the liquid cooling unit 1 through the same liquid inlet main pipe 5, and the first-stage liquid return pipe 212 and the second-stage liquid return pipe 222 can be mutually communicated and are connected to the liquid inlet of the liquid cooling unit 1 through the liquid return main pipe 6, and the liquid inlet main pipe 5 and the liquid return main pipe 6 are all in sealing connection with the liquid cooling unit 1 through a clamp.

In a specific embodiment, the first primary feed pipe 211 and the first primary return pipe 212 are each provided with a first regulating valve 31, and the second primary feed pipe 221 and the second primary return pipe 222 are each provided with a second regulating valve 32. Through the arrangement, on-off and flow control can be carried out on the liquid inlet and the liquid outlet in the circulation loop of the cooling liquid, so that the flexibility of the pipeline group 2 is improved.

For example, when the liquid cooling unit 1 cools only the first to-be-cooled member, the first adjusting valves 31 on the first-stage liquid inlet pipe 211 and the first-stage liquid return pipe 212 are both in an on state, so that the cooling liquid circulates between the liquid cooling unit 1 and the first to-be-cooled member, and the second adjusting valves 32 on the second-stage liquid inlet pipe 221 and the second-stage liquid return pipe 222 are both in an off state, so that the cooling liquid does not flow into the second to-be-cooled member. When the liquid cooling unit 1 only cools the second part to be cooled, the second regulating valves 32 on the second stage liquid inlet pipe 221 and the second stage liquid return pipe 222 are both in a conducting state, so that the cooling liquid circulates between the liquid cooling unit 1 and the second part to be cooled, and the first regulating valves 31 on the first stage liquid inlet pipe 211 and the first stage liquid return pipe 212 are both in a closing state, so that the cooling liquid does not flow into the first part to be cooled.

Further, the first regulating valve 31 on the first-stage liquid inlet pipe 211 and the first-stage liquid return pipe 212 is synchronously opened or closed, and the second regulating valve 32 on the second-stage liquid inlet pipe 221 and the second-stage liquid return pipe 222 is synchronously opened or closed.

In this embodiment, the control member controls the first regulating valve 31 on the same side to be opened or closed synchronously, and controls the first regulating valve 31 on the same side to have the same opening degree, so that the flow rate of the pipeline on the same side is stable, and the flow rate of the cooling liquid in the circulation loop is accurately controlled.

The first tube set 21 further includes a first secondary liquid inlet 213 and a first secondary liquid return 214, the first secondary liquid inlet 213 is in communication with the first primary liquid inlet 211, the first secondary liquid inlet 213 has a plurality of first liquid inlet branches 2131, the plurality of first liquid inlet branches 2131 is in communication with the first part to be cooled, the first secondary liquid return 214 is in communication with the first primary liquid return 212, the first secondary liquid return 214 has a plurality of first liquid return branches 2141, and the plurality of first liquid return branches 2141 is in communication with the first part to be cooled.

The second tube set 22 further includes a second-stage liquid inlet tube 223 and a second-stage liquid return tube 224, the second-stage liquid inlet tube 223 is communicated with the second-stage liquid inlet tube 221, the second-stage liquid inlet tube 223 has a plurality of second liquid inlet branches 2231, the plurality of second liquid inlet branches 2231 are communicated with the second cooling member to be cooled, the second-stage liquid return tube 224 is communicated with the second-stage liquid return tube 222, the second-stage liquid return tube 224 has a plurality of second liquid return branches 2241, and the plurality of second liquid return branches 2241 are communicated with the second cooling member to be cooled.

Illustratively, the first secondary liquid inlet pipe 213, the first secondary liquid return pipe 214, the second secondary liquid inlet pipe 223 and the second secondary liquid return pipe 224 all extend longitudinally along the height direction of the battery pack, one end of the first secondary liquid inlet pipe is connected with the corresponding primary liquid inlet pipe or primary liquid return pipe, the other end of the first secondary liquid inlet pipe is sealed by a plug, a plurality of liquid inlet branches are distributed at intervals along the length direction of the secondary liquid inlet pipe, and a plurality of liquid return branches are distributed at intervals along the length direction of the corresponding secondary liquid return pipe so as to correspond to a plurality of liquid cooling plates arranged along the height direction of the battery pack. It is understood that the first secondary liquid inlet pipe 213 and the first secondary liquid return pipe 214 respectively correspond to the position of the first member to be cooled, and the second secondary liquid inlet pipe 223 and the second secondary liquid return pipe 224 respectively correspond to the position of the second member to be cooled. It will be appreciated that the primary liquid inlet pipe includes a first primary liquid inlet pipe 211 and a second primary liquid inlet pipe 221, the primary liquid return pipe includes a first primary liquid return pipe 212 and a second primary liquid return pipe 222, the second liquid inlet pipe includes a first secondary liquid inlet pipe 213 and a second secondary liquid inlet pipe 223, the second liquid return pipe includes a first secondary liquid return pipe 214 and a second secondary liquid return pipe 224, the liquid inlet branch includes a first liquid inlet branch 2131 and a second liquid inlet branch 2231, and the liquid return branch includes a first liquid return branch 2141 and a second liquid return branch 2241.

Through the above arrangement, the first pipe group 21 is communicated with the multiple positions of the first part to be cooled through the first liquid return branch 2141 and the first liquid inlet branch 2131, and the second pipe group 22 is communicated with the multiple positions of the first part to be cooled through the second liquid return branch 2241 and the second liquid inlet branch 2231, so that the cooling effect of the liquid cooling device on the part to be cooled is enhanced, and the heat dissipation efficiency of the part to be cooled is improved.

Further, the first secondary liquid inlet pipes 213 and the first secondary liquid return pipes 214 are plural, the plural first secondary liquid inlet pipes 213 are distributed at intervals along the length direction of the first primary liquid inlet pipe 211, and the plural first secondary liquid return pipes 214 are distributed at intervals along the length direction of the first primary liquid return pipe 212. The number of the second-stage liquid inlet pipes 223 and the second-stage liquid return pipes 224 is multiple, the second-stage liquid inlet pipes 223 are distributed at intervals along the length direction of the second-stage liquid inlet pipe 221, and the second-stage liquid return pipes 224 are distributed at intervals along the length direction of the second-stage liquid return pipe 222.

Illustratively, a portion of the battery packs of the energy storage system are arranged in a row on a first side and another portion of the battery packs are arranged in a row on a second side, the first-stage liquid inlet pipe 211 and the first-stage liquid return pipe 212 extend transversely along the arrangement direction of the battery packs on the first side, and the second-stage liquid inlet pipe 221 and the second-stage liquid return pipe 222 extend transversely along the arrangement direction of the battery packs on the second side. Through setting up a plurality of second grade feed liquor pipes and a plurality of second grade return liquid pipe, can correspond the position of a plurality of battery packs to cool down each battery pack.

The first secondary liquid inlet pipe 213 is detachably connected with the first primary liquid inlet pipe 211, the first secondary liquid return pipe 214 is detachably connected with the first primary liquid return pipe 212, the second secondary liquid inlet pipe 223 is detachably connected with the second primary liquid inlet pipe 221, and the second secondary liquid return pipe 224 is detachably connected with the second primary liquid return pipe 222. Specifically, as shown in fig. 2 and 3, the first primary liquid inlet pipe 211, the first primary liquid return pipe 212, the second primary liquid inlet pipe 221 and the second primary liquid return pipe 222 are of a sectional structure, two adjacent sections of primary liquid inlet pipes are connected with one secondary liquid inlet pipe through the tee joint 7, two adjacent sections of primary liquid return pipes are connected with one secondary liquid return pipe through the tee joint 7, and the assembly difficulty is reduced, and the assembly efficiency is improved.

The liquid cooling device further comprises a third regulating valve 4, wherein the third regulating valve 4 is arranged on the first secondary liquid inlet pipe 213, the first secondary liquid return pipe 214, the second secondary liquid inlet pipe 223 and the second secondary liquid return pipe 224, and the third regulating valve 4 is used for regulating the opening degrees of the first secondary liquid inlet pipe 213, the first secondary liquid return pipe 214, the second secondary liquid inlet pipe 223 and the second secondary liquid return pipe 224.

The third regulating valve 4 can be a flow regulating valve such as a ball valve, a drain valve and the like, and when the third regulating valve 4 is in a minimum opening state, the secondary liquid inlet pipe or the secondary liquid return pipe can be turned off to prevent the cooling liquid from passing through. The third regulating valve 4 can automatically or manually control the on-off and flow of the secondary liquid inlet pipe and the secondary liquid return pipe, and is convenient to shut off the secondary liquid inlet pipe and the secondary liquid return pipe during maintenance or repair.

On the basis of any of the above embodiments, when the first tube group 21 and the second tube group 22 are switched on and off to be alternately connected, the first regulating valve 31 and the second regulating valve 32 are not immediately turned off or are immediately turned on with the maximum opening degree, but the opening degree is gradually reduced or gradually increased in a period of time until one of the first regulating valve 31 and the second regulating valve 32 is completely turned off and the other is turned on with the maximum opening degree, so that the temperature of the component to be cooled is prevented from being rapidly increased or rapidly decreased, the temperature of the component to be cooled is smoothly changed, and the stability of the liquid cooling device is improved.

As shown in fig. 6, the present invention further provides a liquid cooling control method, which is applied to the liquid cooling device provided in any one of the foregoing embodiments, and the method includes:

s100: acquiring temperature information and operation time of a component to be cooled, wherein the component to be cooled comprises a first component to be cooled positioned on a first side and a second component to be cooled positioned on a second side;

s200: according to the temperature information and the operation time period of the component to be cooled, the opening degrees of the first regulating valve 31 and the second regulating valve 32 are regulated so that the communication of the first tube group 21 with the first component to be cooled and the communication of the second tube group 22 with the second component to be cooled are alternately performed.

Taking the liquid cooling device as an example, the energy storage system comprises a plurality of battery packs, wherein one part of the battery packs are positioned on the first side, the other part of the battery packs are positioned on the second side, and each battery pack comprises a plurality of battery cores which are distributed at intervals along the vertical direction. The first to-be-cooled piece and the second to-be-cooled piece are battery packs, the battery packs further comprise a plurality of liquid cooling plates, and the battery cells and the liquid cooling plates are arranged in a stacked mode, so that the battery cells are cooled through the liquid cooling plates, and the temperature of the battery cells is in a proper working temperature range. The battery pack is internally provided with a temperature sensor and a timing device which are used for acquiring the temperature of the battery cell and the charge/discharge time length of the battery cell.

In step S200, according to the temperature information and the operation time length of the component to be cooled, the first pipe group 21 and the second pipe group 22 are controlled to be alternately communicated, and the first component to be cooled and the second component to be cooled which are positioned on the first side and the second side are alternately cooled and cooled, so that single-side alternate heat dissipation is realized, cooling liquid can be concentrated on the single side, heat dissipation efficiency is ensured, the heat dissipation effect the same as that of the existing high-power liquid cooling device can be realized by utilizing a mode of switching the single side back and forth to perform heat dissipation, the operation power and the energy consumption of the liquid cooling device are saved by nearly half, the operation cost of the liquid cooling device is reduced on the premise of meeting the heat dissipation requirement based on the mode, and the operation cost of the liquid cooling device is saved.

Further, in S200, before adjusting the opening degrees of the first adjusting valve 31 and the second adjusting valve 32 according to the temperature information and the operation time of the component to be cooled so that the communication between the first tube group 21 and the first component to be cooled and the communication between the second tube group 22 and the second component to be cooled are alternately performed, the liquid cooling apparatus control method further includes:

s110: the first tube group 21 and the second tube group 22 are controlled to communicate simultaneously.

Specifically, in this step, the opening degrees of the first and second regulating valves 31 and 32 are controlled so that the first tube group 21 and the second tube group 22 communicate simultaneously. For example, when the component to be cooled starts to operate, the temperature of the component to be cooled which is not cooled is higher, and at this time, the first pipe group 21 and the second pipe group 22 are controlled to be simultaneously communicated, and the first component to be cooled and the second component to be cooled are cooled at the same time, so that the overall temperature of the component to be cooled is rapidly reduced.

In a specific embodiment, controlling the simultaneous communication of the first tube group 21 and the second tube group 22 in step S110 includes:

and controlling the first pipe group (21) and the second pipe group (22) to be communicated simultaneously under the condition that the temperatures of the first to-be-cooled piece and the second to-be-cooled piece are both larger than a first preset temperature threshold value.

In step S200, according to the temperature information and the operation time period of the component to be cooled, the opening degrees of the first regulating valve 31 and the second regulating valve 32 are regulated so that the communication of the first tube group 21 with the first component to be cooled and the communication of the second tube group 22 with the second component to be cooled are alternately performed, including:

S201: in the case where the temperature of at least one of the first member to be cooled and the second member to be cooled is less than or equal to the first preset temperature threshold value, the opening degree of the first regulating valve 31 is controlled to be gradually increased, and the opening degree of the second regulating valve 32 is controlled to be gradually decreased, so that the first member to be cooled and the first tube group 21 are communicated for the first preset time period, and the second member to be cooled and the second tube group 22 are closed for the first preset time period.

The first preset temperature threshold is a standard charging/discharging temperature lower limit value of the first to-be-cooled piece and the second to-be-cooled piece.

It will be understood that the first part to be cooled in step S201 is one of the two parts to be cooled of the component to be cooled, the second part to be cooled is the other of the two parts to be cooled of the component to be cooled, and the "first part to be cooled" and the "second part to be cooled" are only used to distinguish the two parts to be cooled for understanding, and are not intended to limit the present invention.

In step S201, when the temperature of the first to-be-cooled member and/or the second to-be-cooled member is less than or equal to the first preset temperature threshold, the to-be-cooled assembly is cooled sufficiently, and at this time, the first regulating valve 31 and the second regulating valve 32 are controlled to be alternately communicated with each other with the first preset time period as a period, so that the first to-be-cooled member and the second to-be-cooled member are subjected to unilateral heat dissipation, thereby reducing energy consumption while ensuring that the heat dissipation requirement is met. In step S201, the opening degree of the first regulating valve 31 is controlled to be gradually increased, and the opening degree of the second regulating valve 32 is controlled to be gradually decreased so that the first regulating valve 31 is in a communication state for a first preset period of time, and the second regulating valve 32 is controlled to be gradually closed for the first preset period of time; optionally, after a specific period of time passes, the opening degree of the first regulating valve 31 is controlled to be gradually reduced, and the opening degree of the second regulating valve 32 is controlled to be gradually increased, so that the second piece to be cooled and the second pipe group 22 are communicated in a first preset period of time, the first piece to be cooled and the first pipe group 21 are closed in the first preset period of time, and the first piece to be cooled and the second piece to be cooled are sequentially circulated, so that alternate heat dissipation of the first piece to be cooled and the second piece to be cooled is realized.

The opening degree of the first regulating valve 31 or the second regulating valve 32 is controlled to gradually change, rather than being opened or closed immediately, so that the temperature of the component to be cooled is prevented from rapidly changing to cause overlarge temperature difference between a plurality of components to be cooled, which are different from the first regulating valve 31 or the second regulating valve 32, and the service life of the components to be cooled is prevented from being influenced.

In an alternative embodiment, in step S201, after controlling the opening of the first adjusting valve 31 to gradually increase and controlling the opening of the second adjusting valve 32 to gradually decrease, in a case where the temperature of at least one of the first member to be cooled and the second member to be cooled is less than or equal to the first preset temperature threshold value, the method further includes:

s202: if the temperature of the second member to be cooled is greater than or equal to the second preset temperature threshold and the operation time period is less than the preset time period threshold, the opening degree of the first regulating valve 31 is controlled to be gradually reduced, and the opening degree of the second regulating valve 32 is controlled to be gradually increased, so that the first member to be cooled and the first pipe group 21 are closed within the first preset time period, and the second member to be cooled and the second pipe group 21 are communicated within the first preset time period. The second preset temperature threshold is larger than the first preset temperature threshold, and the second preset temperature threshold is the standard charging/discharging temperature upper limit value of the first to-be-cooled piece and the second to-be-cooled piece; the preset duration threshold is used for representing standard duration of the first to-be-cooled piece and the second to-be-cooled piece rising from the first preset temperature threshold to the second preset temperature threshold.

In this embodiment, after the first member to be cooled and the first tube group 21 are communicated for the first preset time period and the second member to be cooled and the second tube group 22 are closed for the first preset time period, the switching states of the first regulating valve 31 and the second regulating valve 32 are controlled according to the temperature and the operation time period of the second member to be cooled, so that the first member to be cooled and the first tube group 21 are closed for the first preset time period and the second member to be cooled and the second tube group 21 are communicated for the first preset time period, and the alternate heat dissipation of the first member to be cooled and the second member to be cooled is realized. The operation duration may be a charge/discharge duration of the second part to be cooled from the last turn-off of the second regulating valve 32, and if the temperature of the second part to be cooled is greater than or equal to the second preset temperature threshold and the operation duration is less than the preset duration threshold, it indicates that the heating rate of the second part to be cooled is higher than the standard heating rate, and at this time, the liquid cooling device is controlled to perform unilateral heat dissipation on the second part to be cooled, so that the second part to be cooled is rapidly cooled to a suitable temperature. It will be appreciated that after the second member to be cooled is subjected to single-sided heat dissipation, if the temperature of the first member to be cooled is greater than or equal to the second preset temperature threshold and the operation duration is less than the preset duration threshold, the first tube set 21 is controlled to be communicated again and the second tube set 22 is controlled to be closed, so as to perform single-sided heat dissipation on the first member to be cooled, and the first member to be cooled is circulated in sequence.

In another alternative embodiment, in step S201, after controlling the opening of the first regulating valve 31 to gradually increase and controlling the opening of the second regulating valve 32 to gradually decrease, in a case where the temperature of at least one of the first member to be cooled and the second member to be cooled is less than or equal to the first preset temperature threshold value, the method further includes:

s203: if the temperature of the second part to be cooled is smaller than the second preset temperature threshold and the operation time length is greater than or equal to the preset time length threshold, the opening of the first regulating valve is controlled to be gradually reduced, and the opening of the second regulating valve is controlled to be gradually increased, so that the first part to be cooled and the first pipe group 21 are closed within the first preset time length, and the second part to be cooled and the second pipe group 22 are communicated within the first preset time length. The second preset temperature threshold is larger than the first preset temperature threshold, and the second preset temperature threshold is the standard charging/discharging temperature upper limit value of the first to-be-cooled piece and the second to-be-cooled piece; the preset duration threshold is used for representing standard duration of the first to-be-cooled piece and the second to-be-cooled piece rising from the first preset temperature threshold to the second preset temperature threshold.

In this embodiment, if the temperature of the second to-be-cooled member is less than the second preset temperature threshold and the operation duration is greater than or equal to the preset duration threshold, it is indicated that the temperature of the second to-be-cooled member is relatively stable, and at this time, the switching states of the first regulating valve 31 and the second regulating valve 32 are controlled according to the operation duration, so that the first to-be-cooled member and the second to-be-cooled member are maintained in the appropriate temperature ranges. It can be understood that after the second member to be cooled is subjected to single-side heat dissipation, if the temperature of the first member to be cooled is less than the second preset temperature threshold and the operation duration is greater than or equal to the preset duration threshold, the first tube set 21 is controlled to be communicated again and the second tube set 22 is controlled to be closed, so that the first member to be cooled is subjected to single-side heat dissipation, and the first member to be cooled is sequentially circulated.

In still another alternative embodiment, in step S201, after controlling the opening of the first regulating valve 31 to gradually increase and controlling the opening of the second regulating valve 32 to gradually decrease, in a case where the temperature of at least one of the first member to be cooled and the second member to be cooled is less than or equal to the first preset temperature threshold value, the method further includes:

s204: if the temperature of the second to-be-cooled piece is smaller than a second preset temperature threshold value and the operation time length is smaller than a preset time length threshold value, acquiring a temperature difference value between the first to-be-cooled piece and the second to-be-cooled piece;

if the temperature difference is greater than the preset temperature difference threshold, the opening of the first regulating valve 31 is controlled to be gradually reduced, and the opening of the second regulating valve 32 is controlled to be gradually increased, so that the first member to be cooled and the first pipe group 21 are closed within a second preset time period, and the second member to be cooled and the second pipe group 22 are communicated within the second preset time period. The second preset temperature threshold is larger than the first preset temperature threshold, the second preset time period is longer than the first preset time period, and the second preset temperature threshold is the standard charge/discharge temperature upper limit value of the first part to be cooled and the second part to be cooled; the preset duration threshold is used for representing standard duration of the first to-be-cooled piece and the second to-be-cooled piece rising from the first preset temperature threshold to the second preset temperature threshold.

In this embodiment, the opening degrees of the first regulating valve 31 and the second regulating valve 32 are controlled based on the temperature difference between the first member to be cooled and the second member to be cooled, preventing the temperature difference between the first member to be cooled and the second member to be cooled from being large to affect the life of the energy storage product. It can be understood that after the second member to be cooled is subjected to single-side heat dissipation, if the temperature of the first member to be cooled is less than the second preset temperature threshold and the operation time period is less than the preset time period threshold, and the temperature difference is greater than the preset temperature difference threshold, the first tube set 21 is controlled to be communicated again and the second tube set 22 is controlled to be closed, so that the first member to be cooled is subjected to single-side heat dissipation, and the first member to be cooled is circulated in sequence.

Alternatively, in the case where the condition of any one of step S202, step S203, and step S204 is satisfied, the opening degrees of the first and second regulating valves 31 and 32 are controlled and adjusted to achieve the alternate heat radiation state switching based on the temperature, the operation time period, and the temperature difference value of the component to be cooled.

The invention also provides an energy storage system, which comprises the liquid cooling device provided by any embodiment, wherein the liquid cooling device is used for cooling the energy storage system.

The energy storage system comprises a plurality of battery packs, a part of battery packs are positioned on a first side, the other part of battery packs are positioned on a second side, and each battery pack comprises a plurality of battery cells which are distributed at intervals along the vertical direction. The first piece of waiting of liquid cooling device and second wait to cool off the piece and be the battery package, and the battery package still includes a plurality of liquid cooling plates, electric core and the range upon range of setting of liquid cooling plate to cool down the electric core through the liquid cooling plate, make the temperature of electric core be in suitable operating temperature range, the liquid cooling plate is linked together with liquid cooling device's pipeline group 2. Specifically, the first tube group 21 communicates with the liquid cooling unit 1 and the liquid cooling plate of the battery pack located on the first side, respectively, and the second tube group 22 communicates with the liquid cooling unit 1 and the liquid cooling plate of the battery pack located on the second side, respectively.

According to the energy storage system provided by the embodiment of the invention, the opening degree of the first regulating valve 31 is controlled through the control piece of the liquid cooling device, so that the first tube group 21 and the second tube group 22 are alternately communicated, the battery pack positioned on the first side and the battery pack positioned on the second side are alternately cooled, single-side alternate heat dissipation is realized, cooling liquid can be concentrated on the single side, heat dissipation efficiency is increased, the running power of the liquid cooling device is greatly reduced, the energy consumption of the liquid cooling device is reduced on the premise of meeting heat dissipation requirements, and the running cost of the energy storage system is saved.

In the description of the present specification, a description referring to the terms "embodiment," "specific embodiment," "example," or "specific example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

The above disclosure is only a preferred embodiment of the present invention, and it should be understood that the scope of the invention is not limited thereto, but all or part of the procedures for implementing the above embodiments can be modified by one skilled in the art according to the scope of the appended claims.

Claims

1. A liquid cooling apparatus, comprising:

a liquid cooling unit (1);

the pipeline group (2) comprises a first pipe group (21) and a second pipe group (22), the first pipe group (21) is used for communicating the liquid cooling unit (1) and the first to-be-cooled piece, and the second pipe group (22) is used for communicating the liquid cooling unit (1) and the second to-be-cooled piece;

a first regulating valve (3) and a second regulating valve, the first regulating valve is mounted on the first pipe group (21), the second regulating valve is mounted on the second pipe group (22), the first regulating valve (3) is used for regulating the flow of the first pipe group (21), and the second regulating valve is used for regulating the flow of the second pipe group (22);

and the control part is in communication connection with the first regulating valve (3) and the second regulating valve, and is used for controlling the opening degrees of the first regulating valve (3) and the second regulating valve so that the communication between the first pipe group (21) and the first piece to be cooled and the communication between the second pipe group (22) and the second piece to be cooled are alternately executed.

2. The liquid cooling device according to claim 1, wherein the first tube group (21) includes a first-stage liquid inlet tube (211) and a first-stage liquid return tube (212), a flow direction of the first-stage liquid inlet tube (211) is from the liquid cooling unit (1) to the first workpiece to be cooled, and a flow direction of the first-stage liquid return tube (212) is from the first workpiece to be cooled to the liquid cooling unit (1);

the second pipe group (22) comprises a second primary liquid inlet pipe (221) and a second primary liquid return pipe (222), the circulation direction of the second primary liquid inlet pipe (221) is from the liquid cooling unit (1) to the second to-be-cooled piece, and the circulation direction of the second primary liquid return pipe (222) is from the second to-be-cooled piece to the liquid cooling unit (1).

3. The liquid cooling device according to claim 2, wherein the first primary liquid inlet pipe (211) and the first primary liquid return pipe (212) are both provided with the first regulating valve, and the second primary liquid inlet pipe (221) and the second primary liquid return pipe (222) are both provided with the second regulating valve.

4. A liquid cooling device according to claim 3, wherein the first regulating valve (3) on the first primary liquid inlet pipe (211) and the first primary liquid return pipe (212) is opened or closed synchronously, and the second regulating valve on the second primary liquid inlet pipe (221) and the second primary liquid return pipe (222) is opened or closed synchronously.

5. The liquid cooling device according to claim 2, wherein the first tube group (21) further comprises a first secondary liquid inlet pipe (213) and a first secondary liquid return pipe (214), the first secondary liquid inlet pipe (213) is in communication with the first primary liquid inlet pipe (211), the first secondary liquid inlet pipe (213) has a plurality of first liquid inlet branches (2131), the plurality of first liquid inlet branches (2131) are in communication with the first piece to be cooled, the first secondary liquid return pipe (214) is in communication with the first primary liquid return pipe (212), the first secondary liquid return pipe (214) has a plurality of first liquid return branches (2141), and the plurality of first liquid return branches (2141) are in communication with the first piece to be cooled;

the second pipe group (22) further comprises a second-stage liquid inlet pipe (223) and a second-stage liquid return pipe (224), the second-stage liquid inlet pipe (223) is communicated with the second-stage liquid inlet pipe (221), the second-stage liquid inlet pipe (223) is provided with a plurality of second liquid inlet branches (2231), the second liquid inlet branches (2231) are communicated with the second to-be-cooled piece, the second-stage liquid return pipe (224) is communicated with the second-stage liquid return pipe (222), the second-stage liquid return pipe (224) is provided with a plurality of second liquid return branches (2241), and the second liquid return branches (2241) are communicated with the second to-be-cooled piece.

6. The liquid cooling device according to claim 5, wherein the number of the first secondary liquid inlet pipes (213) and the first secondary liquid return pipes (214) is plural, the plural first secondary liquid inlet pipes (213) are distributed at intervals along the length direction of the first primary liquid inlet pipe (211), and the plural first secondary liquid return pipes (214) are distributed at intervals along the length direction of the first primary liquid return pipe (212);

the number of the second-stage liquid inlet pipes (223) and the second-stage liquid return pipes (224) is multiple, the second-stage liquid inlet pipes (223) are distributed at intervals along the length direction of the second-stage liquid inlet pipe (221), and the second-stage liquid return pipes (224) are distributed at intervals along the length direction of the second-stage liquid return pipe (222).

7. The liquid cooling device according to claim 5, wherein the first secondary liquid inlet pipe (213) and the first primary liquid inlet pipe (211), the first secondary liquid return pipe (214) and the first primary liquid return pipe (212), the second secondary liquid inlet pipe (223) and the second primary liquid inlet pipe (221), and the second secondary liquid return pipe (224) and the second primary liquid return pipe (222) are detachably connected.

8. The liquid cooling device according to claim 5, further comprising a third adjusting valve (4), wherein the third adjusting valve (4) is disposed on the first secondary liquid inlet pipe (213), the first secondary liquid return pipe (214), the second secondary liquid inlet pipe (223) and the second secondary liquid return pipe (224), and the third adjusting valve (4) is used for adjusting the opening degrees of the first secondary liquid inlet pipe (213), the first secondary liquid return pipe (214), the second secondary liquid inlet pipe (223) and the second secondary liquid return pipe (224).

9. A liquid cooling apparatus control method applied to the liquid cooling apparatus according to any one of claims 1 to 8, characterized by comprising:

according to the temperature information and the operation time length of the component to be cooled, opening degrees of a first regulating valve (31) and a second regulating valve (32) are regulated so that communication of a first pipe group (21) with the first component to be cooled and communication of a second pipe group (22) with the second component to be cooled are alternately executed.

10. The liquid cooling apparatus control method according to claim 9, wherein the liquid cooling apparatus control method further includes, before controlling the opening degrees of the first and second adjusting valves so that communication of the first tube group (21) with the first member to be cooled and communication of the second tube group (22) with the second member to be cooled are alternately performed, based on the temperature information and the operation time period of the member to be cooled:

the first tube group (21) and the second tube group (22) are controlled to communicate simultaneously.

11. The liquid cooling apparatus control method according to claim 10, wherein the controlling of the simultaneous communication of the first tube group (21) and the second tube group (22) includes:

controlling the first tube group (21) and the second tube group (22) to be simultaneously communicated under the condition that the temperatures of the first to-be-cooled piece and the second to-be-cooled piece are both larger than a first preset temperature threshold value;

according to the temperature information and the operation time length of the component to be cooled, the opening degrees of a first regulating valve and a second regulating valve are regulated so that the communication between a first pipe group (21) and the first component to be cooled and the communication between a second pipe group (22) and the second component to be cooled are alternately executed, and the method comprises the following steps:

controlling the opening degree of the first regulating valve to be gradually increased and controlling the opening degree of the second regulating valve to be gradually decreased under the condition that the temperature of at least one of the first to-be-cooled piece and the second to-be-cooled piece is smaller than or equal to the first preset temperature threshold value, so that the first to-be-cooled piece is communicated with the first pipe group (21) in a first preset time period, and the second to-be-cooled piece is closed with the second pipe group (22) in the first preset time period;

12. The liquid cooling apparatus control method according to claim 11, wherein the controlling the opening degree of the first adjusting valve to gradually increase and the controlling the opening degree of the second adjusting valve to gradually decrease in the case where the temperature of at least one of the first member to be cooled and the second member to be cooled is less than or equal to the first preset temperature threshold value further comprises:

if the temperature of the second piece to be cooled is greater than or equal to a second preset temperature threshold value and the operation time length is less than a preset time length threshold value, controlling the opening degree of the first regulating valve to be gradually reduced and controlling the opening degree of the second regulating valve to be gradually increased so as to enable the first piece to be cooled and the first pipe group (21) to be closed within the first preset time length and enable the second piece to be cooled and the second pipe group (21) to be communicated within the first preset time length;

13. The liquid cooling apparatus control method according to claim 11, wherein the controlling the opening degree of the first adjusting valve to gradually increase and the controlling the opening degree of the second adjusting valve to gradually decrease in the case where the temperature of at least one of the first member to be cooled and the second member to be cooled is less than or equal to the first preset temperature threshold value further comprises:

if the temperature of the second piece to be cooled is smaller than a second preset temperature threshold value and the operation time length is larger than or equal to a preset time length threshold value, controlling the opening degree of the first regulating valve to be gradually reduced and controlling the opening degree of the second regulating valve to be gradually increased so as to enable the first piece to be cooled and the first pipe group (21) to be closed within the first preset time length and enable the second piece to be cooled and the second pipe group (22) to be communicated within the first preset time length;

14. The liquid cooling apparatus control method according to claim 11, wherein the controlling the opening degree of the first adjusting valve to gradually increase and the controlling the opening degree of the second adjusting valve to gradually decrease in the case where the temperature of at least one of the first member to be cooled and the second member to be cooled is less than or equal to the first preset temperature threshold value further comprises:

if the temperature difference is larger than a preset temperature difference threshold value, controlling the opening of the first regulating valve to be gradually reduced and controlling the opening of the second regulating valve to be gradually increased so as to enable the first to-be-cooled piece and the first pipe group (21) to be closed within a second preset time period, and enabling the second to-be-cooled piece and the second pipe group (22) to be communicated within the second preset time period;

15. An energy storage system comprising a liquid cooling device according to any one of claims 1 to 8 for cooling the energy storage system.