Thermal management device of energy storage system and thermal management method of energy storage system

Abstract

The invention provides a thermal management device of an energy storage system and a thermal management method of the energy storage system.The energy storage system comprises at least one battery cluster, a main cooling pipeline, a first auxiliary cooling pipeline and a second auxiliary cooling pipeline, and the battery cluster comprises multiple layers of battery packs arranged at intervals in the height direction of the energy storage system; the main cooling pipeline is used for cooling multiple layers of battery packs, the first auxiliary cooling pipeline is used for cooling the first battery module, the second auxiliary cooling pipeline is used for cooling the second battery module, and each single battery is provided with at least one temperature collecting point. The thermal management method comprises the following steps: acquiring temperature data of a temperature collection point of a first battery module and temperature data of a temperature collection point of a second battery module in a plurality of battery packs; and opening of a first auxiliary cooling pipeline and / or a second auxiliary cooling pipeline is controlled according to the multiple pieces of temperature data.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to a thermal management device and a thermal management method for an energy storage system. Background Art

[0002] Energy storage containers are an important form of energy storage in the energy system. In related technologies, at least one battery cluster is set up in the energy storage container, and an air cooling system is used to dissipate heat from multiple battery clusters. The air cooling system includes air conditioning and cooling pipes. The cooling pipes are set at the top of the battery cluster and cool the battery cluster from top to bottom. When a battery module of the battery pack in the battery cluster has an abnormal temperature, it is difficult for the cooling pipe to enhance the cooling of the battery module, thereby affecting the overall temperature balance of the battery cluster and affecting the service life of the battery cluster. Summary of the invention

[0003] The embodiments of the present invention provide a thermal management device and a thermal management method for an energy storage system, which can improve the technical problem of overall temperature imbalance of a battery cluster caused by abnormal temperature of a local battery module of a battery pack of a battery cluster.

[0004] In a first aspect, an embodiment of the present invention provides a thermal management method for an energy storage system, wherein the energy storage system comprises at least one battery cluster, a main cooling pipe, a first auxiliary cooling pipe, and a second auxiliary cooling pipe, wherein the battery cluster comprises a plurality of battery packs spaced apart along a height direction of the energy storage system, wherein the main cooling pipe is configured to cool the plurality of battery packs, wherein each battery pack comprises a plurality of battery modules, wherein the plurality of battery modules comprises a first battery module and a second battery module arranged side by side, wherein the first auxiliary cooling pipe is configured to cool the first battery module, wherein the second auxiliary cooling pipe is configured to cool the second battery module, wherein the first battery module and the second battery module each comprise a plurality of single cells, wherein each single cell is provided with at least one temperature sampling point, wherein the thermal management method comprises:

[0005] Acquire temperature data of the temperature sampling points of the first battery modules and temperature data of the temperature sampling points of the second battery modules in the plurality of battery packs;

[0006] The opening of the first auxiliary cooling channel and / or the second auxiliary cooling channel is controlled according to the plurality of temperature data.

[0007] In one embodiment, the cooling pipeline further includes a plurality of first switch valves and a plurality of second switch valves, each of the first switch valves is provided corresponding to one of the first battery modules and is used to control the connection between the main cooling pipeline and the first auxiliary cooling pipeline, each of the second switch valves is provided corresponding to one of the second battery modules and is used to control the connection between the cooling pipeline and the second auxiliary cooling pipeline, and the thermal management method further includes:

[0008] Acquire the temperature average of the battery modules of the same battery pack according to the plurality of temperature data;

[0009] Wherein, controlling the opening of the first auxiliary cooling pipe and / or the second auxiliary cooling pipe according to the plurality of temperature data includes: controlling the opening of the plurality of first switch valves or the plurality of second switch valves according to the temperature average of the battery module.

[0010] In one embodiment, the thermal management method includes:

[0011] The step of controlling the opening of the plurality of first switch valves or the plurality of second switch valves according to the temperature average of the battery module comprises:

[0012] When the difference between the temperature data of the single battery in the first battery module and the temperature average of the first battery module is greater than a first preset difference and less than a second preset difference, the first switch valve corresponding to the first auxiliary cooling pipe corresponding to the first battery module is controlled to open.

[0013] In one embodiment, when the difference between the temperature data of the single battery in the first battery module and the average temperature of the first battery module is greater than a first preset difference and less than a second preset difference, controlling the opening of the first switch valve corresponding to the first auxiliary cooling pipe corresponding to the first battery module includes:

[0014] When the difference between the temperature data of the single cells in the first battery module and the temperature average of the first battery module is greater than the first preset difference and less than the second preset difference, the opening degree of the first switch valve corresponding to the first auxiliary cooling pipe corresponding to the first battery module is controlled according to the difference between the temperature data of the single cells and the temperature average of the first battery module.

[0015] In one embodiment, the cooling pipeline further includes a plurality of first switch valves and a plurality of second switch valves, each of the first switch valves is provided corresponding to one of the first battery modules and is used to control the connection between the main cooling pipeline and the first auxiliary cooling pipeline, each of the second switch valves is provided corresponding to one of the second battery modules and is used to control the connection between the cooling pipeline and the second auxiliary cooling pipeline, and the thermal management method includes:

[0016] Acquire a temperature difference between a module average value of the first battery module and a module average value of the second battery module in the same battery pack according to the plurality of temperature data;

[0017] The step of controlling the opening of the first auxiliary cooling pipeline and / or the second auxiliary cooling pipeline according to the plurality of temperature data comprises:

[0018] The opening of the first switch valve or the second switch valve is controlled according to the temperature difference between the module average value of the first battery module and the module average value of the second battery module.

[0019] In one embodiment, controlling the opening of the first switch valve or the second switch valve according to the temperature difference between the module average value of the first battery module and the module average value of the second battery module includes:

[0020] When the temperature difference between the module mean of the first battery module and the module mean of the second battery module is greater than the third preset difference and less than the second preset difference, the first switch valve corresponding to the first auxiliary cooling pipe corresponding to the first battery module is controlled to open.

[0021] In a second aspect, an embodiment of the present invention provides a thermal management device for an energy storage system, the energy storage system comprising at least one battery cluster, a main cooling pipe, a first auxiliary cooling pipe, and a second auxiliary cooling pipe, the battery cluster comprising a plurality of battery packs spaced apart along a height direction of the energy storage system, the main cooling pipe being configured to cool the plurality of battery packs, each of the battery packs comprising a plurality of battery modules, the plurality of battery modules comprising a first battery module and a second battery module arranged side by side, the first auxiliary cooling pipe being configured to cool the first battery module, the second auxiliary cooling pipe being configured to cool the second battery module, the first battery module and the second battery module both comprising a plurality of single cells, each of the single cells being provided with at least one temperature sampling point, the thermal management device comprising:

[0022] A battery pack monitoring unit, used to obtain temperature data of multiple temperature sampling points of the first battery module and temperature data of multiple temperature sampling points of the second battery module in the battery pack;

[0023] The battery cluster management system is used to control the opening of the first auxiliary cooling pipe and / or the second auxiliary cooling pipe according to the temperature data of the multiple temperature sampling points of the first battery module and the temperature data of the multiple temperature sampling points of the second battery module.

[0024] In one embodiment, the cooling pipe also includes a plurality of first connecting pipes and a plurality of second connecting pipes, and the plurality of first connecting pipes or the plurality of second connecting pipes are arranged at intervals along the height direction of the energy storage system, wherein each of the first connecting pipes is connected to the corresponding main cooling pipe and the first auxiliary cooling pipe and is arranged corresponding to a layer of the battery pack, and each of the second connecting pipes is connected to the corresponding main cooling pipe and the second auxiliary cooling pipe and is arranged corresponding to a layer of the battery pack.

[0025] In one embodiment, the cooling pipe also includes a plurality of first switch valves and a plurality of second switch valves, each of the first switch valves is arranged on the first connecting pipe to control the connection between the main cooling pipe and the first auxiliary cooling pipe, and each of the second switch valves is arranged on the second connecting pipe to control the connection between the cooling pipe and the second auxiliary cooling pipe.

[0026] In one embodiment, the battery cluster management system is electrically connected to multiple first switch valves and is used to control the opening or closing of the first switch valves or the flow of the first switch valves; and / or, the battery cluster management system is electrically connected to multiple second switch valves and is used to control the opening or closing of the second switch valves or the flow of the second switch valves.

[0027] In one embodiment, the battery pack monitoring unit is further used to obtain the temperature average of the battery modules of the same battery pack based on the multiple temperature data, and the battery cluster management system is further used to control the opening of the first switch valve or the second switch valve based on the temperature average of the battery module.

[0028] In one embodiment, when the difference between the temperature data of the single battery in the first battery module and the temperature average of the battery module is greater than a first preset difference and less than a second preset difference, the battery cluster management system is also used to control the opening of the first switch valve corresponding to the first auxiliary cooling pipe corresponding to the first battery module.

[0029] In one embodiment, when the difference between the temperature data of the single cell in the first battery module and the temperature average of the first battery module is greater than a first preset difference and less than a second preset difference, the battery cluster management system controls the opening degree of the first switch valve corresponding to the first auxiliary cooling pipe corresponding to the first battery module according to the difference between the temperature data of the single cell and the temperature average of the first battery module.

[0030] In one embodiment, the battery pack monitoring unit is further used to obtain the difference between the module mean of the first battery module and the module mean of the second battery module in the same battery pack based on the multiple temperature data, and the battery cluster management system is further used to control the opening of the first switch valve or the second switch valve based on the temperature difference between the module mean of the first battery module and the module mean of the second battery module.

[0031] In one embodiment, when the temperature difference between the module mean of the first battery module and the module mean of the second battery module is greater than a third preset difference and less than a second preset difference, the battery cluster management system is also used to control the opening of the first switch valve corresponding to the first auxiliary cooling pipe corresponding to the first battery module.

[0032] Beneficial effects of the embodiments of the present invention:

[0033] In an embodiment of the present invention, a main cooling pipe is used to cool a multi-layer battery module, a first auxiliary cooling pipe is used to enhance cooling of the first battery module, and a second auxiliary cooling pipe is used to enhance cooling of the second battery module, wherein the first auxiliary cooling pipe is controlled to open according to temperature data of multiple temperature sampling points of the first battery module, and the second auxiliary cooling pipe is controlled to open according to temperature data of multiple temperature sampling points of the second battery module, thereby achieving precise temperature control of the battery modules of the battery cluster. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 is a three-dimensional schematic diagram of an energy storage system from one viewing angle provided by an embodiment of the present invention;

[0036] Figure 2 is a three-dimensional schematic diagram of an energy storage system from another perspective provided by an embodiment of the invention;

[0037] Figure 3 yes Figure 2 A partial enlarged view of

[0038] Figure 4 is a three-dimensional schematic diagram of a refrigerator and a cooling pipe provided by an embodiment of the present invention;

[0039] Figure 5 It is a schematic cross-sectional structure diagram of a refrigerator and a cooling pipe provided in a second embodiment of the present invention;

[0040] Figure 6 is a schematic diagram of the structure of a thermal management system of an energy storage system provided by an embodiment of the present invention;

[0041] Figure 7 is a schematic diagram of the three-dimensional structure of a battery pack provided by an embodiment of the present invention;

[0042] Figure 8is a three-dimensional diagram of a single cell provided by an embodiment of the present invention;

[0043] Fig. 9 is a schematic diagram of the main steps of a thermal management method for an energy storage system provided by an embodiment of the present invention;

[0044] Fig.10 is a schematic diagram of the steps of a thermal management method for an energy storage system provided by an embodiment of the present invention;

[0045] Fig.11 is a schematic diagram of some steps of a thermal management method for an energy storage system provided by an embodiment of the present invention;

[0046] Fig.12 is a schematic diagram of some steps of a thermal management method for an energy storage system provided by an embodiment of the present invention;

[0047] Fig.13 is a schematic diagram of steps of a thermal management method for an energy storage system provided by another embodiment of the present invention;

[0048] Fig.14 is a schematic diagram of some steps of a thermal management method for an energy storage system provided by another embodiment of the present invention;

[0049] Figure Number:

[0050] 100. Energy storage system;

[0051] 1. Battery cluster; 111. Top surface; 112. Bottom surface; 113. Side surface; 12. Battery pack; 121. Bottom battery pack; 122. Top battery pack; 13. Air inlet; 14. First battery module; 15. Second battery module; 17. Single battery; 18. Temperature sampling point;

[0052] 2. Refrigerator; 21. Pipeline interface;

[0053] 3. Cooling pipeline; 31. Main cooling pipeline; 311. Inlet of main cooling pipeline; 312. Diverter port; 313. Air outlet of main cooling pipeline; 32. Auxiliary cooling pipeline; 321. First auxiliary cooling pipeline; 322. Second auxiliary cooling pipeline; 323. Connecting port of first auxiliary cooling pipeline; 324. Connecting port of second auxiliary cooling pipeline; 325. Air outlet of first auxiliary cooling pipeline; 326. Air outlet of second auxiliary cooling pipeline; 33. Connecting pipe; 331. First connecting pipe; 332. Second connecting pipe; 34. Switch valve; 341. First switch valve; 342. Second switch valve; 35. Partition plate; 36. Cooling branch pipe;

[0054] 4. Battery rack; 41. Column; 42. Crossbeam; 43. Side beam;

[0055] 5. Battery cluster management system;

[0056] 6. Battery pack monitoring unit; DETAILED DESCRIPTION

[0057] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the drawings; while "inside" and "outside" refer to the outline of the device.

[0058] In a first aspect, the implementation of the present application provides an energy storage system 100 , which includes a battery cluster box (not shown), at least one battery cluster 1 , a refrigerator 2 , a cooling pipe 3 , and a battery rack 4 .

[0059] The battery cluster box is constructed in the form of a container, and at least one battery cluster 1, a cooling pipe 3 and a battery rack 4 are all arranged inside the battery cluster box. According to the number of battery clusters contained in the battery cluster box, the battery cluster box can be provided with multiple cabinet doors, and the multiple cabinet doors correspond to the multiple battery clusters.

[0060] At least one battery cluster 1 is arranged in the battery cluster box. The number of at least one battery cluster can be multiple. The multiple battery clusters are arranged side by side along the length direction of the energy storage system. The length of the energy storage system is set to the length direction of the battery cluster box. Figure 1 Each battery cluster 1 includes multiple layers of battery packs arranged in parallel along the height direction of the energy storage system. The number of batteries in each layer of battery packs can be one or more. The height direction of the energy storage system is set as the height direction of the battery cluster box. Figure 1The Z direction is shown. Each battery pack includes a battery pack case and a plurality of battery modules arranged inside the battery pack case, and the plurality of battery modules are arranged side by side along the length direction x or the width direction y of the energy storage system. The battery cluster has a top face 111 and a bottom face 112 and a plurality of side faces 113 that are opposite to each other along the height direction Z of the energy storage system, and the plurality of side faces 113 include opposite front side faces and rear side faces, and opposite left side faces and right side faces. The multi-layer battery pack includes a top battery pack 122 arranged near the top face 111 and a bottom battery pack 121 arranged near the bottom face 112. The battery pack case of each battery pack is provided with a plurality of air inlets 13, and the plurality of air inlets 13 usually correspond to the rear side faces of the battery cluster. At the same time, a fan is also installed on the battery pack case, and the fan usually corresponds to the front side faces of the battery cluster. After the cooling medium enters through the air inlet 13, the fan rotates to form a negative pressure inside the battery pack case, so that the cooling medium flows quickly inside the battery pack case, which is beneficial to the cooling of each battery module in the battery pack.

[0061] The battery rack 4 is arranged inside the battery cluster box, and the battery rack 4 is used to install the battery pack. When multiple battery clusters are arranged inside the battery cluster box, multiple battery racks are correspondingly arranged inside the battery cluster box, and each battery rack is used to install one battery cluster. The battery rack 4 includes multiple columns 41, multiple beams 42, and multiple side beams 43, wherein the columns 41 extend along the height direction of the energy storage system, the beams 42 extend along the length direction of the energy storage system, and the side beams 43 extend along the width direction of the energy storage system. The columns 41, beams 42, and side beams 43 are arranged vertically in pairs, and multiple columns 41, multiple beams 42, and multiple side beams 43 are combined to form multiple battery cavities, and each battery cavity is used to accommodate a battery pack.

[0062] The refrigerator 2 may be an air conditioner for providing cooling air. Alternatively, the refrigerator 2 may be a liquid cooling unit for providing cooling liquid. Alternatively, the refrigerator 2 may be a cooling device for providing a phase-change refrigerant. Taking the refrigerator as an air conditioner as an example, the air conditioner may be a large vertical air conditioner, which may be installed inside the battery cluster box, or may be installed outside the battery cluster box. In other optional embodiments, the air conditioner may be a small hanging air conditioner, which may be installed on the inner side of the battery cluster box.

[0063] The cooling pipe 3 includes a main cooling pipe 31 and at least one auxiliary cooling pipe 32. The main cooling pipe inlet 311 is connected to the pipe interface 21 of the refrigerator 2. The auxiliary cooling pipe 32 is provided with a plurality of connection ports corresponding to the multi-layer battery pack 12. Each connection port is connected to the main cooling pipe 31. The main cooling pipe 31 is configured to cool the multi-layer battery pack 12. When a temperature abnormality occurs in the battery pack of the corresponding layer of the auxiliary cooling pipe 32, the corresponding connection port of the auxiliary cooling pipe 32 is connected to the main cooling pipe 31 so that the auxiliary main cooling pipe 31 strengthens the cooling of the battery pack of the corresponding layer, thereby facilitating the acceleration of promoting the overall temperature uniformity of the battery cluster 1.

[0064] Part of the main cooling duct 31 extends between the top end surface 111 and the bottom end surface 112 of the battery cluster 1, so that the cooling medium in the main cooling duct 31 can be provided to the multi-layer battery pack 12 of the battery cluster 1. The auxiliary cooling duct 32 is also arranged to extend between the top end surface 111 and the bottom end surface 112 of the battery cluster 1, so that when a temperature abnormality occurs in any layer of the multi-layer battery pack 12, the connection port of the auxiliary cooling duct 32 corresponding to the layer of battery pack is connected to the main cooling duct 31 and the auxiliary cooling duct 32 is used to enhance the cooling of the layer of battery pack.

[0065] Continue to refer Figures 2 to 4 The cooling pipeline 3 also includes a plurality of connecting pipes 33, which are arranged at intervals along the height direction of the energy storage system 100. The main cooling pipeline 31 is provided with a plurality of branch ports 312, one end of each connecting pipe 33 is connected to a corresponding branch port 312, and the other end of each connecting pipe 33 is connected to a corresponding connecting port.

[0066] In a specific implementation, the auxiliary cooling pipe 32 includes a first auxiliary cooling pipe 321 and a second auxiliary cooling pipe 322, and the first auxiliary cooling pipe 321 and the second auxiliary cooling pipe 322 are respectively arranged on both sides of the main cooling pipe 31, and the multiple connecting pipes 33 include multiple first connecting pipes 331 and multiple second connecting pipes 332. Each layer of battery pack 12 corresponds to a first connecting pipe 331 and a second connecting pipe 332. Each first connecting pipe 331 connects a diversion port 312 on one side of the main cooling pipe 31 and a first auxiliary cooling pipe connecting port 323 of the first auxiliary cooling pipe 321, and each second connecting pipe 332 connects a diversion port 312 on the other side of the main cooling pipe 31 and a second auxiliary cooling pipe connecting port 324 of the second auxiliary cooling pipe 322. The cooling medium diverted from the diversion port 312 on one side of the main cooling pipe 31 enters the corresponding first auxiliary cooling pipe 321 through the first connecting pipe 331, and the cooling medium diverted from the diversion port 312 on the other side of the main cooling pipe 31 enters the corresponding second auxiliary cooling pipe 322 through the second connecting pipe 332.

[0067] Continue to refer Figures 2 to 4 Each connecting pipe 33 is provided with a switch valve 34, and the switch valve 34 is configured to control the connection state between the connecting pipe of the corresponding auxiliary cooling pipeline 32 and the corresponding main cooling pipeline 31. Among them, the switch valve 34 can be a ball valve, a stop valve or a solenoid valve. In a specific implementation, the switch valve 34 includes a first switch valve 341 and a second switch valve 342, the first switch valve 341 is arranged on the first connecting pipe 331, and the second switch valve 342 is arranged on the second connecting pipe 332. The first switch valve 341 is configured to control the fluid connection between the main cooling pipeline 31 and the first auxiliary cooling pipeline 321, and the second switch valve 342 is configured to control the fluid connection between the main cooling pipeline 31 and the second auxiliary cooling pipeline 322.

[0068] For the battery pack 12 in the same layer, the battery pack 12 includes at least two battery modules, and the at least two battery modules include a left battery module and a right battery module. The main cooling pipe 31 corresponds to a part of the single cells of the left battery module and a part of the single cells of the right battery module. The first auxiliary cooling pipe 321 is set to correspond to a part of the single cells of the left battery module, and the second auxiliary cooling pipe 322 is set to correspond to a part of the single cells of the right battery module. When the average temperature of the left battery module is significantly lower than the average temperature of the right battery module and exceeds the temperature difference threshold between the battery modules in the battery pack, the first switch valve 341 is controlled to open and the second switch valve 342 is controlled to close. Since the first auxiliary cooling pipe 321 is set directly opposite to the left battery module, the left battery module can be cooled quickly, so that the temperature difference between the left battery module and the right battery module is within the temperature difference threshold set by the battery cluster management system. Alternatively, when the temperature of at least one single cell of the left battery module exceeds the maximum temperature threshold of the single cell set by the battery cluster management system, the first switch valve 341 is controlled to open and the second switch valve 342 is controlled to close, so that the left battery module can be cooled quickly, so that the temperature of all the single cells of the left battery module is within the temperature requirement range set by the battery cluster management system.

[0069] In a preferred implementation, the initial state of the switch valve 34 is set to a closed state. When the battery cluster management system detects that the temperature of the battery module in the corresponding battery pack is abnormal, the corresponding switch valve 34 is controlled to open, thereby maintaining the overall temperature uniformity of the battery cluster.

[0070] Continue to refer Figure 3 and Figure 4The auxiliary cooling duct 32 is provided with a plurality of auxiliary cooling duct air outlets, the main cooling duct 31 is provided with a plurality of main cooling duct air outlets 313, and each layer of battery pack 12 corresponds to at least one auxiliary cooling duct air outlet and at least one main cooling duct air outlet 313. Each auxiliary cooling duct air outlet is connected to the corresponding diversion port 312 of the main cooling duct 31 through a corresponding connecting port and a corresponding connecting pipe 33, so that the flow of the cooling medium of each auxiliary cooling duct air outlet can be independently controlled by its corresponding connecting pipe 33. In a specific implementation, the first auxiliary cooling duct 321 is provided with a plurality of first auxiliary cooling duct air outlets 325, the second auxiliary cooling duct 322 is provided with a plurality of second auxiliary cooling duct air outlets 326, the battery cluster 1 is provided with five layers of battery packs 12, each layer of battery packs 12 is provided with at least three air inlets 13, one of which is provided corresponding to the first auxiliary cooling duct air outlet 325, one of which is provided corresponding to the main cooling duct air outlet 313, and the other is provided corresponding to the second auxiliary cooling duct air outlet 326. Each first auxiliary cooling duct air outlet 325 is connected to one of the branch ports 312 on one side of the corresponding main cooling duct 31 through the corresponding first auxiliary cooling duct connection port 323 and the corresponding first connection pipe 331, and each second auxiliary cooling duct air outlet 326 is connected to one of the branch ports 312 on the other side of the corresponding main cooling duct 31 through the corresponding second auxiliary cooling duct connection port 324 and the corresponding second connection pipe 332.

[0071] In some embodiments, continue to refer to Figures 3 to 5 Each auxiliary cooling pipe 32 includes a plurality of partitions 35, and the plurality of partitions 35 are configured to separate the auxiliary cooling pipe 32 into a plurality of cooling branches 36. Each cooling branch 36 is configured to cool a layer of battery packs. Each cooling branch 36 is provided with at least one auxiliary cooling pipe air outlet, a connection port, and a connection pipe 33. The cooling medium diverted from a diversion port 312 of the main cooling pipe 31 flows through a connection pipe 33 and its corresponding connection port and then flows into the corresponding cooling branch 36, and flows out through at least one auxiliary cooling pipe air outlet of the cooling branch 36 and then cools the layer of battery packs corresponding to the cooling branch 36. It is understandable that when the battery cluster management system detects that the temperature of the corresponding battery pack is abnormal, the cooling medium is controlled to flow into the cooling branch 36 corresponding to the auxiliary cooling pipe 32 of the battery pack, so as to facilitate the priority cooling of the battery pack.

[0072] In some embodiments, continue to refer to Figure 4 and Figure 5The plurality of cooling branches 36 include at least one adjacent first cooling branch 361 and second cooling branch 362, and the first cooling branch 361 and second cooling branch 362 are configured to be disconnected. That is, the partition 35 between the first cooling branch 361 and the second cooling branch 362 is configured to completely separate the first cooling branch 361 and the second cooling branch 362. In a specific implementation, the battery cluster 1 includes five layers of battery packs 12, and correspondingly, four partitions 35 are provided in the auxiliary cooling duct 32, and the four partitions 35 divide the auxiliary cooling duct 32 into five cooling branches. For example, when the temperature of the left battery module where the third-layer battery pack is located is abnormal, the battery cluster management system controls the cooling medium in the main cooling pipe 31 to flow into the third cooling branch pipe of the first auxiliary cooling pipe 321, and at the same time, the cooling medium flowing into the third cooling branch pipe is set to flow only into the third cooling branch pipe and no longer into the fourth cooling branch pipe or the second cooling branch pipe, thereby reducing the impact on the temperature of the battery pack corresponding to the fourth cooling branch pipe and the second cooling branch pipe, thereby achieving accurate and rapid temperature control.

[0073] In some embodiments, the main cooling duct inlet 311 is arranged close to the bottom end surface 112 of the energy storage system. After the cooling medium enters the main cooling duct 31, it flows along the bottom end surface 112 of the energy storage system toward the top end surface 111 of the energy storage system. It is understandable that as the cooling medium flows, the flow rate of the cooling medium decreases and the temperature increases, so that the cooling effect of the top battery pack 122 is obviously not as good as the cooling effect of the bottom battery pack 121. In order to improve the temperature difference between the top battery pack 122 and the bottom battery pack 121, the cross-sectional area of ​​the main cooling duct outlet 313 increases along the direction from the bottom end surface 112 of the energy storage system toward the top end surface 111, so that the flow rate of the cooling medium flowing toward each layer of battery pack 12 along the direction from the bottom end surface 112 of the energy storage system toward the top end surface 111 increases, which is conducive to reducing the temperature difference between each layer of battery packs.

[0074] In some implementations, the plurality of main cooling duct air outlets 313 include a first main cooling duct air outlet 313a and a second main cooling duct air outlet 313b spaced apart in the height direction of the energy storage system, the first main cooling duct air outlet 313a is arranged closer to the top surface 111 of the battery cluster 1 than the second main cooling duct air outlet 313b, and the ratio of the inner diameter of the first main cooling duct air outlet 313a to the inner diameter of the second main cooling duct air outlet 313b is 1.01 to 1.3. In a specific implementation, the ratio of the inner diameter of the first main cooling duct air outlet 313a to the inner diameter of the second main cooling duct air outlet 313b can be 1.01, 1.05, 1.1, 1.12, 1.15, 1.18, 1.2, 1.21, 1.23, 1.25, 1.28, 1.3, and a value between any two of the above values ​​or a range between any two of the above values.

[0075] It is understandable that if the ratio of the inner diameter of the first main cooling duct outlet 313a to the inner diameter of the second main cooling duct outlet 313b is less than 1.01, the cross-sectional area of ​​the first main cooling duct outlet 313a changes less relative to the cross-sectional area of ​​the second main cooling duct outlet 313b, so that the flow rate of the cooling medium flowing out of the first main cooling duct outlet 313a increases less relative to the flow rate of the cooling medium flowing out of the second main cooling duct outlet 313b, and thus the difference in cooling effect between two adjacent layers of battery packs is improved less. If the ratio of the inner diameter of the first main cooling duct outlet 313a to the inner diameter of the second main cooling duct outlet 313b is greater than 1.3, the cross-sectional area of ​​the first main cooling duct outlet 313a changes more relative to the cross-sectional area of ​​the second main cooling duct outlet 313b, which is not conducive to adjusting the difference in cooling effect between each layer of battery packs.

[0076] In a specific implementation, the first main cooling duct 31 is provided with five main cooling duct air outlets 313, and the first main cooling duct inlet 311 is arranged close to the bottom battery pack 121, and the ratios of the inner diameters of the five main cooling duct air outlets 313 from the bottom end surface 112 toward the top end surface 111 are 1:1.2:1.3:1.5:1.8 respectively.

[0077] In a second aspect, an embodiment of the present application provides a thermal management device for an energy storage system, such as Figures 1 to 8 As shown, the energy storage system includes at least one battery cluster 1, a main cooling pipe 31, a first auxiliary cooling pipe 321 and a second auxiliary cooling pipe 322. The battery cluster 1 includes a multi-layer battery pack 12 arranged at intervals along the height direction of the battery cluster 1, and each battery pack 12 includes a first battery module and a second battery module arranged side by side along the length direction of the battery cluster 1. The main cooling pipe 31 is configured to cool the multi-layer battery pack 12, the first auxiliary cooling pipe 321 is configured to cool the first battery module 14, and the second auxiliary cooling pipe 322 is configured to cool the second battery module 15. The first battery module 14 and the second battery module 15 each include a plurality of single cells 17, and at least one temperature sampling point 18 is provided on the surface of each single cell 17. In a specific implementation, each battery module in the battery pack 12 includes eight single cells, and two temperature sampling points 18 are arranged on each single cell, and the two temperature sampling points 18 correspond to the temperature of the left pole and the temperature of the right pole of the single cell 17. A total of 32 temperature sampling points are provided in each battery pack 12.

[0078] The thermal management device 200 includes a battery cluster management system 5 (BMS-Battery Management System) and a battery pack monitoring unit 6 (BCMU-Battery Control and Management Unit). In addition to being used to adjust the working state of the energy storage system, the thermal management device 200 is also used to adjust the temperature of the energy storage system. The thermal management device 200 controls the opening of the first auxiliary cooling pipe 321 and the second auxiliary cooling pipe 322 to achieve precise temperature control of the first battery module 14 and / or the second battery module 15 of the battery pack 12 of the battery cluster 1.

[0079] In a specific implementation, the energy storage system 100 includes a battery cluster 1, which is provided with five layers of battery packs 12, each layer of battery packs 12 is provided with a battery pack 12, and each battery pack 12 includes a first battery module 14 and a second battery module 15 arranged side by side along the length direction of the battery cluster. Each battery pack 12 is provided with a battery pack monitoring unit 6, and five battery packs 12 are provided with five battery pack monitoring units 6. The battery pack monitoring units 6 communicate with each other through a controller area network (CAN-Controller Area Network), and each battery pack monitoring unit 6 communicates with a battery cluster management system 5 through the controller area network. All temperature sampling points in the same battery pack 12 are electrically connected to the battery pack monitoring unit 6 through a temperature sampling line (Sampling), and the battery pack monitoring unit 6 obtains the temperature data of multiple temperature sampling points 18 of multiple single cells of the first battery module 14 in the corresponding battery pack 12, and obtains the temperature data of multiple temperature sampling points 18 of multiple single cells 17 of the second battery module 15 in the same battery pack 12 and transmits them to the battery cluster management system 5. The battery cluster management system 5 is used to control the opening of the first auxiliary cooling pipe 321 and / or the second auxiliary cooling pipe 322 according to the temperature data of the multiple temperature sampling points 18 of the first battery module 14 and the temperature data of the multiple temperature sampling points 18 of the second battery module 15 .

[0080] The battery cluster management system 5 controls the opening or closing of the first auxiliary cooling pipe 321 according to the obtained multiple temperature data of multiple temperature sampling points of multiple single cells of the first battery module 14. It is understandable that when the first auxiliary cooling pipe 321 is opened, the cooling effect of the first battery module 14 is correspondingly enhanced, which is conducive to maintaining temperature balance between the first battery module 14 and the second battery module 15. The battery cluster management system 5 controls the opening or closing of the second auxiliary cooling pipe 322 according to the obtained multiple temperature data of multiple temperature sampling points of multiple single cells 17 of the second battery module 15. It is understandable that when the second auxiliary cooling pipe 322 is opened, the cooling effect of the second battery module 15 is correspondingly enhanced, which is conducive to maintaining temperature balance between the second battery module 15 and the first battery module 14.

[0081] In one embodiment, the cooling pipe includes a plurality of first connecting pipes, a plurality of second connecting pipes, a plurality of first switch valves, and a plurality of second switch valves. The plurality of first connecting pipes and the plurality of second connecting pipes are arranged at intervals along the height direction of the battery cluster. Each first connecting pipe connects the corresponding main cooling pipe and the first auxiliary cooling pipe and is arranged corresponding to a layer of battery packs. Each first switch valve is arranged on the first connecting pipe to control the connection between the main cooling pipe and the first auxiliary cooling pipe. Each second connecting pipe connects the corresponding main cooling pipe and the second auxiliary cooling pipe and is arranged corresponding to a layer of battery packs. Each second switch valve is arranged on the second connecting pipe to control the connection between the cooling pipe and the second auxiliary cooling pipe.

[0082] The battery cluster management system 5 is electrically connected to multiple first switch valves and multiple second switch valves. The battery cluster management system can be used to control the opening or closing of the first switch valves or the flow of the first switch valves. The battery cluster management system can also be used to control the opening or closing of the second switch valves or the flow of the second switch valves.

[0083] After collecting the temperature data of multiple temperature sampling points in the same battery pack 12, the battery pack monitoring unit 6 will calculate in real time the battery mean and battery range of the two temperature sampling points corresponding to the left and right poles of each single battery 17, as well as the module mean and module range of the temperature data of multiple temperature sampling points of multiple single batteries corresponding to the first battery module and the second battery module, and feed back the relevant temperature data to the battery cluster management system 5. After obtaining the relevant temperature data, the battery cluster management system 5 calculates the battery cluster temperature mean and battery cluster temperature range of the entire energy storage system.

[0084] When the battery cluster management system 5 sets the energy storage system to operate normally, the temperature data of two or more temperature sampling points of the single battery must be within the preset temperature range, the preset temperature range is 25℃~35℃, the difference between the temperature data of two or more temperature sampling points of any single battery of the first battery module or the second battery module and the corresponding module mean value does not exceed the first preset difference, the difference between the average temperatures of multiple battery packs does not exceed the second preset difference, and the average temperature of the first battery module and the average temperature of the second battery module do not exceed the third preset difference. Among them, the first preset difference is 1℃, the second preset difference is 3℃, and the third preset difference is 2℃. When the battery cluster management system 5 detects that the temperature data of the temperature sampling point of any single battery in any battery pack is greater than 35℃, the battery cluster management system 5 reports to the alarm system, and cuts off the power of the battery pack as a whole and checks the reason why the temperature data of the single battery is too high. When the battery cluster management system 5 detects that the difference between the temperature data of the temperature sampling point of any single battery in a battery module and the module mean value of the battery module is greater than 3℃, the battery pack is cut off as a whole and the reason why the temperature data of the single battery is too high is eliminated. When the battery cluster management system 5 detects that the difference between the module mean of the first battery module and the module mean of the second battery module in the same battery pack is greater than 3°C, the battery pack is powered off as a whole and multiple single cells in the battery module with the higher module mean are checked. When the battery cluster management system 5 detects that the difference between the average temperatures of any two battery packs is greater than 5°C, the battery cluster is powered off and multiple single cells in the battery pack with the higher average temperature are checked.

[0085] When the battery cluster management system 5 detects that the difference between the temperature data of the temperature sampling point of the single cell of the first battery module in a certain battery pack and the module average of the first battery module is greater than the first preset difference and less than the second preset difference, the battery cluster management system 5 is used to control the opening of the first switch valve corresponding to the first auxiliary cooling pipe corresponding to the first battery module to strengthen the cooling of the multiple single cells of the first battery module, so that the difference between any single cell of the first battery module and the module average of the first battery module does not exceed the first preset difference.

[0086] In one embodiment, when the battery cluster management system 5 detects that the difference between the temperature data of the temperature sampling point of at least one single battery in the first battery module 14 in a certain battery pack and the module mean of the first battery module 14 is greater than the first preset difference and less than the second preset difference, the battery cluster management system 5 controls the opening degree of the first switch valve corresponding to the first auxiliary cooling pipe corresponding to the first battery module 14 according to the difference between the temperature data of the temperature sampling point of the single battery in the first battery module 14 and the module mean of the first battery module 14. For example, when the difference between the temperature data of the temperature sampling point of a single battery in the first battery module 14 and the module mean of the first battery module 14 is 2.5°C, the first switch valve corresponding to the first battery module 14 is controlled to be in a partially open state. When the difference between the temperature data of the temperature sampling point of a single battery in the first battery module 14 and the module mean of the first battery module 14 is close to 3°C, the first switch valve corresponding to the first battery module 14 is controlled to be in a fully open state.

[0087] Similarly, when the battery cluster management system 5 detects that the difference between the temperature data of the temperature sampling point of at least one single cell in the second battery module in a certain battery pack and the module average of the second battery module is greater than the first preset difference and less than the second preset difference, the battery cluster management system 5 is used to control the opening of the second switch valve corresponding to the second auxiliary cooling pipe corresponding to the second battery module to strengthen the cooling of the multiple single cells of the second battery module, so that the difference between any single cell of the second battery module and the module average of the second battery module does not exceed the first preset difference.

[0088] In one embodiment, when the battery cluster management system 5 detects that the difference between the temperature data of the temperature sampling point of at least one single cell in the second battery module in a certain battery pack and the module mean of the second battery module is greater than the first preset difference and less than the second preset difference, the battery cluster management system 5 controls the opening degree of the second switch valve corresponding to the second auxiliary cooling pipe corresponding to the second battery module according to the difference between the temperature data of the temperature sampling point of the single cell in the second battery module and the module mean of the second battery module. For example, when the difference between the temperature data of the temperature sampling point of a single cell in the second battery module and the module mean of the second battery module is 2.5°C, the second switch valve corresponding to the second battery module is controlled to be in a partially open state. When the difference between the temperature data of the temperature sampling point of a single cell in the second battery module and the module mean of the second battery module is close to 3°C, the second switch valve corresponding to the second battery module is controlled to be in a fully open state.

[0089] In one embodiment, the battery pack monitoring unit 6 is further used to calculate the module mean of the multiple temperature data of the first battery module 14 and the module mean of the multiple temperature data of the second battery module based on the multiple temperature data of the multiple temperature sampling points in the same battery pack, and calculate the difference between the module mean of the multiple temperature data of the first battery module 14 and the module mean of the multiple temperature data of the second battery module. The battery cluster management system controls the opening of the first switch valve or the second switch valve based on the difference between the module mean of the first battery module 14 and the module mean of the second battery module in the same battery pack.

[0090] Specifically, when the module mean value of the first battery module is greater than the module mean value of the second battery module, the first switch valve corresponding to the first battery module can be controlled to be opened to enhance cooling of the first battery module. When the module mean value of the second battery module is greater than the module mean value of the first battery module, the second switch valve corresponding to the second battery module can be controlled to be opened to enhance cooling of the second battery module, thereby maintaining temperature balance between the first battery module and the second battery module in the same battery pack.

[0091] In one embodiment, the battery cluster management system 5 sets the difference between the module mean of the first battery module and the module mean of the second battery module in the same battery pack to be no greater than a third preset difference. When the battery cluster management system 5 detects that the difference between the module mean of the first battery module and the module mean of the second battery module in a battery pack is greater than the third preset difference and less than the second preset difference, the battery cluster management system is used to control the opening of the first switch valve corresponding to the first auxiliary cooling pipe corresponding to the first battery module. By strengthening the cooling of the first battery module, the difference between the module mean of the first battery module and the module mean of the second battery module is no greater than the third preset difference, thereby maintaining temperature balance between the first battery module and the second battery module in the same battery pack.

[0092] Similarly, when the battery cluster management system 5 detects that the difference between the module mean of the second battery module in a battery pack and the module mean of the first battery module is greater than the third preset difference and less than the second preset difference, the battery cluster management system is used to control the opening of the second switch valve corresponding to the second auxiliary cooling pipe corresponding to the second battery module. By strengthening the cooling of the second battery module, the difference between the module mean of the second battery module and the module mean of the first battery module is not greater than the third preset difference, thereby maintaining temperature balance between the first battery module and the second battery module in the same battery pack.

[0093] It should be noted that when the module mean value of the first battery module and the module mean value of the second battery module are greater than the third preset difference, the battery cluster management system 5 controls the battery pack to be powered off and removes multiple single cells in the battery module with higher temperature.

[0094] In a third aspect, the embodiments of the present application also provide a thermal management method applied to the above energy storage system, such as Fig. 9 As shown, the thermal management method includes:

[0095] S100, acquiring temperature data of a temperature sampling point of a first battery module and temperature data of a temperature sampling point of a second battery module in a plurality of battery packs;

[0096] S200 , controlling the opening of the first auxiliary cooling pipeline and / or the second auxiliary cooling pipeline according to a plurality of temperature data.

[0097] In an embodiment of the present application, a main cooling pipe is used to cool a multi-layer battery module, a first auxiliary cooling pipe is used to enhance cooling of the first battery module, and a second auxiliary cooling pipe is used to enhance cooling of the second battery module, wherein the first auxiliary cooling pipe is controlled to open according to temperature data of multiple temperature sampling points of the first battery module, and the second auxiliary cooling pipe is controlled to open according to temperature data of multiple temperature sampling points of the second battery module, thereby achieving precise temperature control of the battery modules of the battery pack of the battery cluster.

[0098] In some embodiments, Fig.10 As shown, the thermal management method of the energy storage system also includes:

[0099] S110, obtaining a temperature average of battery modules of the same battery pack according to multiple temperature data;

[0100] Wherein, S200 includes: S210, controlling the opening of the plurality of first switch valves or the plurality of second switch valves according to the temperature average of the battery module.

[0101] In a specific implementation, Fig.11 As shown, S210 includes:

[0102] S211. When the difference between the temperature data of the single cells in the first battery module and the module average of the first battery module is greater than the first preset difference and less than the second preset difference, control the opening of the first switch valve corresponding to the first auxiliary cooling pipe corresponding to the first battery module.

[0103] The first battery module is cooled by controlling the opening of the first switch valve so that the difference between the temperature data of the single battery in the first battery module and the module average of the first battery module is not greater than the first preset difference, thereby maintaining the temperature balance among the multiple single batteries in the first battery module.

[0104] Similarly, when the difference between the temperature data of the single battery in the second battery module and the module average of the second battery module is greater than the first preset difference and less than the second preset difference, the second switch valve corresponding to the second battery module is controlled to open.

[0105] The second battery module is cooled more effectively by controlling the opening of the second switch valve so that the difference between the temperature data of the multiple single cells in the second battery module and the module average of the second battery module is not greater than the first preset difference, thereby maintaining the temperature balance between the multiple single cells in the second battery module.

[0106] In some embodiments, Fig.12 As shown, S211 includes:

[0107] S212. When the difference between the temperature data of the single cells in the first battery module and the temperature average of the first battery module is greater than the first preset difference and less than the second preset difference, the opening degree of the first switch valve corresponding to the first auxiliary cooling pipe corresponding to the first battery module is controlled according to the difference between the temperature data of the single cells and the temperature average of the first battery module.

[0108] The opening degree of the first switch valve is controlled according to the difference between the temperature data of the single cells in the first battery module and the temperature average of the first battery module, so that the first auxiliary cooling pipe can accurately control the opening degree of the first switch valve according to the temperature data of the single cells in the first battery module, so as to prevent the first auxiliary cooling pipe from cooling the first battery module too high or too low, thereby making it difficult to control the temperature balance among the multiple single cells in the first battery module.

[0109] Similarly, when the difference between the temperature data of the single cell in the second battery module and the temperature average of the second battery module is greater than the first preset difference and less than the second preset difference, the opening degree of the second switch valve corresponding to the second auxiliary cooling pipe corresponding to the second battery module is controlled according to the difference between the temperature data of the single cell and the temperature average of the second battery module.

[0110] The opening degree of the second switch valve is controlled according to the difference between the temperature data of the single cells in the second battery module and the temperature average of the second battery module, so that the second auxiliary cooling pipe can accurately control the opening degree of the second switch valve according to the temperature data of the single cells in the second battery module, so as to prevent the cooling effect of the second auxiliary cooling pipe on the first battery module from being too high or too low, thereby making it difficult to control the temperature balance among the multiple single cells in the second battery module.

[0111] In some embodiments, Fig.13As shown, the thermal management method of the energy storage system also includes:

[0112] S120, acquiring a temperature difference between a module average value of a first battery module and a module average value of a second battery module in the same battery pack according to a plurality of temperature data;

[0113] S200 includes: S220, controlling the opening of the first switch valve or the second switch valve according to the temperature difference between the module average value of the first battery module and the module average value of the second battery module.

[0114] When the temperature difference between the first battery module and the second battery module in the same battery pack is large, correspondingly, the temperature difference between the module mean of the first battery module and the module mean of the second battery module is large. Therefore, the opening of the first switch valve or the second switch valve is controlled according to the module mean of the first battery module and the module mean of the second battery module, which is beneficial to accurately control the temperature balance between the first battery module and the second battery module.

[0115] In a specific implementation, Fig.14 As shown, S220 includes:

[0116] S221. When the temperature difference between the module mean of the first battery module and the module mean of the second battery module is greater than the third preset difference and less than the second preset difference, control the opening of the first switch valve corresponding to the first auxiliary cooling pipe corresponding to the first battery module.

[0117] By setting a third preset difference and a second preset difference, wherein the third preset difference is the maximum value of the temperature difference between the module mean of the first battery module and the module mean of the second battery module in the same battery pack set by the battery cluster management system, and the second preset difference is the maximum value between the battery pack mean values ​​of different battery packs set by the battery cluster management system. When the temperature difference between the module mean of the first battery module and the module mean of the second battery module is less than the third preset difference, the first switch valve remains closed. When the temperature difference between the module mean of the first battery module and the module mean of the second battery module is greater than the third preset difference and less than the second preset difference, the first switch valve is controlled to open to strengthen the cooling of the first battery module, so that the module mean of the first battery module and the module mean of the second battery module are not greater than the third preset difference. When the temperature difference between the module mean of the first battery module and the module mean of the second battery module is greater than the second preset difference, the battery cluster management system controls the battery cluster to power off and checks multiple single cells in the battery pack with a larger battery pack mean.

[0118] Similarly, when the temperature difference between the module mean of the second battery module and the module mean of the first battery module is greater than the third preset difference and less than the second preset difference, the second switch valve corresponding to the second auxiliary cooling pipe corresponding to the second battery module is controlled to open.

[0119] When the temperature difference between the module mean of the second battery module and the module mean of the first battery module is less than the third preset difference, the second switch valve remains closed. When the temperature difference between the module mean of the second battery module and the module mean of the first battery module is greater than the third preset difference and less than the second preset difference, the second switch valve is controlled to open to enhance cooling of the second battery module so that the module mean of the second battery module and the module mean of the first battery module are not greater than the third preset difference. When the temperature difference between the module mean of the second battery module and the module mean of the first battery module is greater than the second preset difference, the battery cluster management system controls the battery cluster to be powered off and checks multiple single cells in the battery pack with a larger battery pack mean.

[0120] In a specific implementation, the temperature adjustment method of the battery cluster management system includes:

[0121] Adjustment method A: When the battery cluster management system detects that the temperature data of the temperature sampling point of a single battery in a battery pack is greater than 35°C, the battery cluster management system reports to the alarm system and cuts off the power to the battery pack to eliminate the cause of the fault of the single battery with too high temperature in the battery pack;

[0122] Adjustment method B: When the battery cluster management system detects that the temperature data of the temperature sampling point of a single battery in a battery pack is relatively high but not greater than 35°C, the temperature data of the temperature sampling point of the single battery is compared with the module average temperature of the corresponding battery module, and the adjustment is performed in the following two ways according to the comparison between the temperature data of the single battery and the module average temperature of the corresponding battery module:

[0123] Adjustment method B1: When the difference between the temperature data of a single cell and the average module temperature of its corresponding battery module is less than 1°C, the first switch valve or the second switch valve corresponding to the battery module is controlled to remain closed;

[0124] Adjustment method B2: When the difference between the temperature data of the single cell and the module average temperature of the corresponding battery module is greater than 1°C and less than 3°C, the opening degree of the first switch valve or the second switch valve is controlled according to the temperature difference between the temperature data of the single cell and the module average temperature of the corresponding battery module;

[0125] Adjustment method B3: When the difference between the temperature data of a single cell and the average temperature of its corresponding battery module is greater than 3°C, the battery cluster management system controls the corresponding battery pack to be powered off and checks the battery module with abnormal temperature.

[0126] Adjustment method C: When the battery cluster management system detects that the difference between the average module temperature of the first battery module and the average module temperature of the second battery module in the same battery pack is greater than 2°C and less than 3°C, the first switch valve corresponding to the first battery module in the battery pack is controlled to open.

[0127] Adjustment method D: When the battery cluster management system detects that the difference between the average module temperature of the first battery module and the average module temperature of the second battery module in the same battery pack is greater than 3°C, the battery pack is controlled to be powered off and the battery module with abnormal temperature is checked.

[0128] Adjustment method E: When the battery cluster management system detects that the difference between the average temperatures of different battery packs is greater than 5°C, the battery cluster is powered off and the battery pack with the higher temperature is checked.

[0129] Adjustment method F: When the battery cluster management system detects that the difference between the average battery pack temperatures of different battery packs is greater than 3°C and less than 5°C, the battery pack with the highest temperature is located, and the difference between the average module temperature of the first battery module of the battery pack with the highest temperature and the average module temperature of the second battery module is compared, referring to adjustment methods C and D.

[0130] The embodiments of the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A thermal management method for an energy storage system, the energy storage system comprising at least one battery cluster, a main cooling pipe, a first auxiliary cooling pipe and a second auxiliary cooling pipe, the battery cluster comprising multiple layers of battery packs spaced apart along the height direction of the energy storage system, the main cooling pipe being configured to cool multiple layers of the battery packs, each of the battery packs comprising a plurality of battery modules, the plurality of battery modules comprising a first battery module and a second battery module arranged side by side, the first auxiliary cooling pipe being configured to cool the first battery module, the second auxiliary cooling pipe being configured to cool the second battery module, the first battery module and the second battery module both comprising a plurality of single cells, each of the single cells being provided with at least one temperature sampling point, characterized in that: The thermal management method comprises: Acquire temperature data of the temperature sampling points of the first battery modules and temperature data of the temperature sampling points of the second battery modules in the plurality of battery packs; The opening of the first auxiliary cooling channel and / or the second auxiliary cooling channel is controlled according to the plurality of temperature data.

2. The thermal management method of the energy storage system according to claim 1, characterized in that: The cooling pipeline further includes a plurality of first switch valves and a plurality of second switch valves, each of the first switch valves is provided corresponding to one of the first battery modules and is used to control the connection between the main cooling pipeline and the first auxiliary cooling pipeline, and each of the second switch valves is provided corresponding to one of the second battery modules and is used to control the connection between the cooling pipeline and the second auxiliary cooling pipeline. The thermal management method further includes: Acquire the temperature average of the battery modules of the same battery pack according to the plurality of temperature data; Wherein, controlling the opening of the first auxiliary cooling pipeline and / or the second auxiliary cooling pipeline according to the plurality of temperature data comprises: The opening of the plurality of first switch valves or the plurality of second switch valves is controlled according to the temperature average of the battery module.

3. The thermal management method of the energy storage system according to claim 2, characterized in that: The thermal management method comprises: The step of controlling the opening of the plurality of first switch valves or the plurality of second switch valves according to the temperature average of the battery module comprises: When the difference between the temperature data of the single battery in the first battery module and the temperature average of the first battery module is greater than a first preset difference and less than a second preset difference, the first switch valve corresponding to the first auxiliary cooling pipe corresponding to the first battery module is controlled to open.

4. The thermal management method of the energy storage system according to claim 3, characterized in that: When the difference between the temperature data of the single battery in the first battery module and the average temperature of the first battery module is greater than a first preset difference and less than a second preset difference, controlling the opening of the first switch valve corresponding to the first auxiliary cooling pipe corresponding to the first battery module includes: When the difference between the temperature data of the single cells in the first battery module and the temperature average of the first battery module is greater than the first preset difference and less than the second preset difference, the opening degree of the first switch valve corresponding to the first auxiliary cooling pipe corresponding to the first battery module is controlled according to the difference between the temperature data of the single cells and the temperature average of the first battery module.

5. The thermal management method of the energy storage system according to claim 1, characterized in that: The cooling pipeline further includes a plurality of first switch valves and a plurality of second switch valves, each of the first switch valves is provided corresponding to one of the first battery modules and is used to control the connection between the main cooling pipeline and the first auxiliary cooling pipeline, and each of the second switch valves is provided corresponding to one of the second battery modules and is used to control the connection between the cooling pipeline and the second auxiliary cooling pipeline. The thermal management method includes: Acquire a temperature difference between a module average value of the first battery module and a module average value of the second battery module in the same battery pack according to the plurality of temperature data; The step of controlling the opening of the first auxiliary cooling pipeline and / or the second auxiliary cooling pipeline according to the plurality of temperature data comprises: The opening of the first switch valve or the second switch valve is controlled according to the temperature difference between the module average value of the first battery module and the module average value of the second battery module.

6. The thermal management method of the energy storage system according to claim 5, characterized in that: The step of controlling the opening of the first switch valve or the second switch valve according to the temperature difference between the module average value of the first battery module and the module average value of the second battery module comprises: When the temperature difference between the module mean of the first battery module and the module mean of the second battery module is greater than the third preset difference and less than the second preset difference, the first switch valve corresponding to the first auxiliary cooling pipe corresponding to the first battery module is controlled to open.

7. A thermal management device for an energy storage system, characterized in that: The energy storage system comprises at least one battery cluster, a main cooling pipe, a first auxiliary cooling pipe and a second auxiliary cooling pipe. The battery cluster comprises a plurality of battery packs spaced apart along the height direction of the energy storage system. The main cooling pipe is configured to cool the plurality of battery packs. Each of the battery packs comprises a plurality of battery modules. The plurality of battery modules comprises a first battery module and a second battery module arranged side by side. The first auxiliary cooling pipe is configured to cool the first battery module. The second auxiliary cooling pipe is configured to cool the second battery module. The first battery module and the second battery module each comprise a plurality of single cells. Each of the single cells is provided with at least one temperature sampling point. The thermal management device comprises: A battery pack monitoring unit, used to obtain temperature data of multiple temperature sampling points of the first battery module and temperature data of multiple temperature sampling points of the second battery module in the battery pack; The battery cluster management system is used to control the opening of the first auxiliary cooling pipe and / or the second auxiliary cooling pipe according to the temperature data of the multiple temperature sampling points of the first battery module and the temperature data of the multiple temperature sampling points of the second battery module.

8. The thermal management device of the energy storage system according to claim 7, characterized in that: The cooling pipe also includes a plurality of first connecting pipes and a plurality of second connecting pipes, and the plurality of first connecting pipes or the plurality of second connecting pipes are arranged at intervals along the height direction of the energy storage system, wherein each of the first connecting pipes is connected to the corresponding main cooling pipe and the first auxiliary cooling pipe and is arranged corresponding to a layer of the battery pack, and each of the second connecting pipes is connected to the corresponding main cooling pipe and the second auxiliary cooling pipe and is arranged corresponding to a layer of the battery pack.

9. The thermal management device of the energy storage system according to claim 8, characterized in that: The cooling pipeline also includes a plurality of first switch valves and a plurality of second switch valves, each of the first switch valves is arranged on the first connecting pipe to control the connection between the main cooling pipeline and the first auxiliary cooling pipeline, and each of the second switch valves is arranged on the second connecting pipe to control the connection between the cooling pipeline and the second auxiliary cooling pipeline.

10. The thermal management device of the energy storage system according to claim 9, characterized in that: The battery cluster management system is electrically connected to multiple first switch valves and is used to control the opening or closing of the first switch valves or the flow of the first switch valves; and / or, the battery cluster management system is electrically connected to multiple second switch valves and is used to control the opening or closing of the second switch valves or the flow of the second switch valves.

11. The thermal management device of the energy storage system according to claim 10, characterized in that: The battery pack monitoring unit is further used to obtain the temperature average of the battery modules of the same battery pack based on the multiple temperature data, and the battery cluster management system is further used to control the opening of the first switch valve or the second switch valve based on the temperature average of the battery module.

12. The thermal management device of the energy storage system according to claim 11, characterized in that: When the difference between the temperature data of the single battery in the first battery module and the temperature average of the battery module is greater than a first preset difference and less than a second preset difference, the battery cluster management system is also used to control the opening of the first switch valve corresponding to the first auxiliary cooling pipe corresponding to the first battery module.

13. The thermal management device of the energy storage system according to claim 12, characterized in that: When the difference between the temperature data of the single cells in the first battery module and the temperature average of the first battery module is greater than the first preset difference and less than the second preset difference, the battery cluster management system controls the opening degree of the first switch valve corresponding to the first auxiliary cooling pipe corresponding to the first battery module according to the difference between the temperature data of the single cells and the temperature average of the first battery module.

14. The thermal management device of the energy storage system according to claim 10, characterized in that: The battery pack monitoring unit is also used to obtain the difference between the module mean of the first battery module and the module mean of the second battery module in the same battery pack based on the multiple temperature data, and the battery cluster management system is also used to control the opening of the first switch valve or the second switch valve based on the temperature difference between the module mean of the first battery module and the module mean of the second battery module.

15. The thermal management device of the energy storage system according to claim 14, characterized in that: When the temperature difference between the module mean of the first battery module and the module mean of the second battery module is greater than the third preset difference and less than the second preset difference, the battery cluster management system is also used to control the opening of the first switch valve corresponding to the first auxiliary cooling pipe corresponding to the first battery module.

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