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 first cooling pipeline and a second cooling pipeline, the battery cluster comprises multiple layers of battery packs arranged in the height direction of the battery cluster, each battery pack comprises a first battery module and a second battery module which are arranged side by side, the first cooling pipeline is arranged to cool the first battery module, and the second cooling pipeline is arranged to cool the second battery module. Each of the first battery module and the second battery module comprises a plurality of single batteries, and each single battery is provided with at least one temperature collection 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 adjusting the flow of the cooling medium of the first cooling pipeline and / or the second cooling pipeline according to the 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] As an important form of energy storage in the energy system, the energy storage container will be equipped with at least one battery cluster, and an air cooling system will be used to dissipate heat from a single battery cluster. The air cooling system includes air conditioning and cooling ducts. The cooling ducts are usually arranged on the top of the battery cluster. The battery cluster includes multiple layers of battery packs, and each layer of battery packs includes multiple battery modules. The cooling ducts can usually only cool some battery modules of the same battery pack, which makes the temperature difference between different battery modules of the same battery pack large, thus affecting the overall heat dissipation effect of the energy storage container and thus reducing the overall life of the energy storage container. 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 uneven cooling effect of the energy storage system.

[0004] In a first aspect, an embodiment of the present application provides a thermal management method for an energy storage system, the energy storage system comprising at least one battery cluster, a first cooling pipe and a second cooling pipe; the battery cluster comprises a multi-layer battery pack arranged along the height direction of the battery cluster, each of the battery packs comprises a first battery module and a second battery module arranged side by side, the first cooling pipe is configured to cool the first battery module, the second 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 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 flow of the cooling medium in the first cooling channel and / or the second cooling channel is regulated according to the temperature data.

[0007] In some embodiments, the thermal management method further includes: obtaining a module range of the battery modules in the same battery pack according to a plurality of temperature data;

[0008] Wherein, regulating the flow of the cooling medium in the first cooling pipeline and / or the second cooling pipeline according to the temperature data includes: regulating the flow of the cooling medium in the first cooling pipeline and / or the second cooling pipeline according to the module range difference.

[0009] In some embodiments, adjusting the flow rate of the cooling medium in the first cooling pipe and / or the second cooling pipe according to the module range difference includes: when the module range difference of the first battery module is greater than a first preset difference and less than a second preset difference, adjusting the flow rate of the cooling medium in the first cooling pipe.

[0010] In some embodiments, the thermal management method includes: obtaining the battery extremes of the single cells in the same battery module based on multiple temperature data, and adjusting the flow of the cooling medium in the first cooling pipe and / or the second cooling pipe based on the temperature data includes: adjusting the temperature of the cooling medium in the first cooling pipe and / or the second cooling pipe based on the battery extremes.

[0011] In some embodiments, the first cooling pipe is connected to a first cooling pipe interface of a refrigerator, and the second cooling pipe is connected to a second cooling pipe interface of the refrigerator, and adjusting the temperature of the cooling medium of the first cooling pipe and / or the second cooling pipe according to the battery extreme difference includes: when the battery extreme difference of the first battery module is greater than a third preset difference, adjusting the temperature of the cooling medium flowing out of the first cooling pipe interface to which the first cooling pipe corresponding to the first battery module is connected.

[0012] In a second aspect, an embodiment of the present application provides a thermal management device for an energy storage system, the energy storage system comprising at least one battery cluster, a first cooling pipe and a second cooling pipe; the battery cluster comprises a multi-layer battery pack arranged along the height direction of the battery cluster, each of the battery packs comprising a first battery module and a second battery module arranged side by side, the first cooling pipe is configured to cool the first battery module, the second 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, configured to obtain temperature data of a plurality of temperature sampling points of the first battery module and temperature data of a plurality of temperature sampling points of the second battery module in the battery pack; a battery cluster management system, configured to control the flow of cooling medium in the first cooling pipe and / or the second cooling pipe according to the temperature data of the plurality of temperature sampling points of the first battery module and the temperature data of the plurality of temperature sampling points of the second battery module.

[0013] In some embodiments, the first cooling duct includes multiple groups of first air outlets, the second cooling duct includes multiple groups of second air outlets, the battery pack includes a box body, the box body is provided with a first air inlet and a second air inlet, the first air inlet corresponds to the first battery module, the second air inlet corresponds to the second battery module, each group of the first air outlet is arranged corresponding to the first air inlet, each group of the second air outlet is arranged corresponding to the second air inlet, and the battery cluster management system is configured to adjust the flow rate of the cooling medium flowing out of the first air outlet and / or the second air outlet.

[0014] In some embodiments, when the module range difference of the first battery module is greater than a first preset difference and less than a second preset difference, the battery cluster management system adjusts the flow rate of the cooling medium in the first cooling pipe.

[0015] In some embodiments, the flow rate after adjustment of the first air outlet is set to L1x, the flow rate before adjustment of the first air outlet is set to L1y, the time required for the battery cluster management system to adjust the flow rate is set to t, the maximum temperature of the single battery in the first battery module is set to X1max, the maximum temperature threshold of the single battery is set to Y1, and the absolute value of the difference between the number of layers of the battery pack where the first battery module is located and the number of layers of the battery pack corresponding to the inlet of the first cooling pipe is set to H, then L1x satisfies the following relationship:

[0016]

[0017] Among them, L1x>L1y, 1≤H≤10, 1s≤t≤10s.

[0018] In some embodiments, the first cooling duct includes multiple groups of first air outlets, the second cooling duct includes multiple groups of second air outlets, the battery pack includes a box body, the box body is provided with a first air inlet and a second air inlet, the first air inlet corresponds to the first battery module, the second air inlet corresponds to the second battery module, each group of the first air outlets is arranged corresponding to the first air inlet, and each group of the second air outlets is arranged corresponding to the second air inlet, the first cooling duct is connected to a first cooling duct interface of a refrigerator, the second cooling duct is connected to a second cooling duct interface of the refrigerator, and the battery cluster management system is configured to adjust the temperature of the cooling medium flowing out of the first cooling duct interface and / or the second cooling duct interface.

[0019] In some embodiments, the battery pack monitoring unit is also used to obtain the battery extreme difference of the single battery in the same battery module based on multiple temperature data, and the battery cluster management system adjusts the temperature of the cooling medium of the first cooling pipe and / or the second cooling pipe according to the battery extreme difference.

[0020] In some embodiments, when the battery range difference of the first battery module is greater than a third preset difference, the battery cluster management system adjusts the temperature of the cooling medium flowing out of the first cooling pipe interface connected to the first cooling pipe corresponding to the first battery module.

[0021] In some embodiments, the temperature of the cooling medium flowing out of the first cooling pipe interface after adjustment is set to C1x, the temperature of the cooling medium flowing out of the first cooling pipe interface before adjustment is set to C1y, the time required for the battery cluster management system to adjust the temperature is set to t, the maximum temperature of the single battery in the first battery module is set to X1max, the maximum temperature threshold of the single battery is set to Y1, and the absolute value of the difference between the number of layers of the battery pack where the first battery module is located and the number of layers of the battery pack corresponding to the inlet of the first cooling pipe is set to H, then C1x satisfies the following relationship:

[0022]

[0023] Among them, C1x<Y<C1y, 1≤H≤10, 1s≤t≤10s.

[0024] Beneficial effects of the embodiments of the present invention:

[0025] In an embodiment of the present invention, a first cooling pipe is provided to cool the first battery module of each layer of battery pack of the battery cluster, and a second cooling pipe is provided to cool the second battery module of each layer of battery pack of the battery cluster. The flow of the cooling medium in the first cooling pipe is controlled according to the temperature data of multiple temperature sampling points of the first battery module, and the flow of the cooling medium in the second cooling pipe is controlled according to the temperature data of multiple temperature sampling points of the second battery module, so that the temperature balance is maintained between the first battery module and the second battery module of each layer of battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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.

[0027] Figure 1 is a three-dimensional schematic diagram of an energy storage system from one viewing angle provided by the first embodiment of the present invention;

[0028] Figure 2 is a three-dimensional schematic diagram of an energy storage system from another perspective provided by the first embodiment of the present invention;

[0029] Figure 3 yes Figure 2 A partial enlarged view of

[0030] Figure 4 is a three-dimensional schematic diagram of a battery pack provided by an embodiment of the present invention;

[0031] Figure 5 is a three-dimensional schematic diagram of a box of a battery pack provided by an embodiment of the present invention;

[0032] Figure 6 is a front view of a first cooling pipe, a second cooling pipe and a refrigerator after being connected according to an embodiment of the present invention;

[0033] Figure 7 is a three-dimensional diagram of a single cell provided by an embodiment of the present invention;

[0034] Figure 8 is a control diagram of a thermal management system of an energy storage system provided by an embodiment of the present invention;

[0035] 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;

[0036] 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;

[0037] 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;

[0038] Fig.12 is a schematic diagram of steps of a thermal management method for an energy storage system provided by another embodiment of the present invention;

[0039] Fig.13 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;

[0040] Figure Number:

[0041] 100. Energy storage system;

[0042] 1. Battery cluster; 111. Top surface; 112. Bottom surface; 12. Battery pack; 121. First end; 122. Second end; 123. Bottom battery pack; 124. Top battery pack; 13. Ventilation hole;

[0043] 2. Refrigerator; 21. Pipeline interface;

[0044] 31. first cooling pipeline; 311. first cooling pipeline inlet; 312. first cooling pipeline outlet; 313. first air outlet; 314. cooling section; 315. interface section; 316. first interface; 32. second cooling pipeline; 321. second cooling pipeline inlet; 322. end; 323. second air outlet; 324. second interface; 33. connecting branch pipe; 331. bottom connecting pipe; 332. top connecting pipe; 333. middle connecting branch pipe;

[0045] 4. Battery rack; 41. Column; 42. Crossbeam; 43. Side beam; DETAILED DESCRIPTION

[0046] 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.

[0047] First, refer to Figure 1 and Figure 2 An embodiment 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, and a battery rack 4 .

[0048] The battery cluster box is constructed in the form of a container, and at least one battery cluster 1, a cooling pipe 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.

[0049] At least one battery cluster 1 is disposed in the battery cluster box, the battery cluster 1 includes multiple layers of battery packs arranged along the height direction of the battery cluster, the number of batteries in each layer of battery packs can be one or more, wherein the height direction of the battery cluster is set as the height direction of the box, and the height direction of the battery cluster is as follows: Figure 1 The Z direction shown. The number of at least one battery cluster can be multiple, and the multiple battery clusters are arranged side by side along the length direction of the battery cluster. The length of the battery cluster is set to the length direction of the battery cluster box. The length direction of the battery cluster is as shown in FIG. Figure 1In the x direction shown, each layer of battery packs in the multiple battery clusters are arranged side by side along the length direction of the battery cluster to form a battery cluster group.

[0050] The battery cluster 1 has a top face 111 and a bottom face 112 opposite to each other in the height direction, a left side face 113 and a right side face 114 opposite to each other in the width direction y, and a front side face 115 and a rear side face 116 opposite to each other in the length direction x. Each battery cluster 1 includes a plurality of battery packs 12 spaced apart in the height direction z of the battery cluster 1, and the battery packs 12 include a top battery pack 121 located at the top face 111 of the battery cluster 1 and a bottom battery pack 122 located at the bottom face 112 of the battery cluster 1. The number of battery packs 12 included in the battery cluster 1 may be any integer between 2 and 10. In a specific implementation, Figure 1 As shown, the battery cluster 1 includes five layers of battery packs 12 .

[0051] The battery rack 4 is arranged inside the box, and the battery rack 4 is used to install the battery pack. When multiple battery clusters are arranged inside the box, multiple battery racks are correspondingly arranged inside the 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 battery cluster, the beams 42 extend along the length direction of the battery cluster, and the side beams 43 extend along the width direction of the battery cluster. 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.

[0052] The refrigerator 2 may be an air conditioner, which is used to provide cooling air. Alternatively, the refrigerator 2 may be a liquid cooling unit, which is used to provide cooling liquid. Alternatively, the refrigerator 2 may be a cooling device, which is used to provide 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 box, or may be installed outside the box. In other optional embodiments, the air conditioner may be a small hanging air conditioner, which is installed on the inner side of the box.

[0053] The cooling pipe includes a first cooling pipe 31 and a second cooling pipe 32, and the first cooling pipe 31 and the second cooling pipe 32 are set as two non-connected cooling pipes, wherein the first cooling pipe inlet 311 is connected to the first cooling pipe interface 21 of the refrigerator 2, and the first cooling pipe inlet 311 is arranged close to the bottom end surface 112 of the battery cluster 1, and a part of the first cooling pipe 31 extends from the bottom end surface 112 to the top end surface 111 of the battery cluster 1. The second cooling pipe inlet 321 is connected to the second cooling pipe interface 22 of the refrigerator 2, and the second cooling pipe inlet 321 is arranged close to the top end surface 111 of the battery cluster 1, and a part of the first cooling pipe 31 extends from the top end surface 111 to the bottom end surface 112 of the battery cluster 1. The flow direction of the cooling medium in the first cooling pipe 31 is set to flow from the bottom end surface 112 to the top end surface 111 of the battery cluster 1, and the flow direction of the cooling medium in the second cooling pipe 32 is set to flow from the top end surface 111 to the bottom end surface of the battery cluster 1.

[0054] Taking the battery cluster 1 including five layers of battery packs 12 as an example, along the flow direction of the cooling medium, the cooling effect of the first cooling pipe 31 and the second cooling pipe 32 is divided into five components, namely 1 point, 2 points, 3 points, 4 points and 5 points, among which 1 point has the worst cooling effect and 5 points has the best cooling effect. For the top battery pack 121, the cooling effect provided by the first cooling pipe 31 is 1 point, the cooling effect provided by the second cooling pipe 32 is 5 points, and the cooling effect of the first cooling pipe 31 and the second cooling pipe 32 obtained by the top battery pack 121 is 6 points. For the bottom battery pack 122, the cooling effect provided by the first cooling pipe 31 is 5 points, the cooling effect provided by the second cooling pipe 32 is 1 point, and the cooling effect of the first cooling pipe 31 and the second cooling pipe 32 obtained by the bottom battery pack 122 is 6 points. For the third battery pack, the cooling effect provided by the first cooling pipe 31 is 3 points, the cooling effect provided by the second cooling pipe 32 is 3 points, and the cooling effect of the first cooling pipe 31 and the second cooling pipe 32 obtained by the third battery pack is 6 points. In summary, for different layers of battery packs in the same battery cluster 1, since they are cooled by the first cooling pipe 31 and the second cooling pipe 32 at the same time, the cooling effect on different layers of battery packs in the same battery cluster 1 is the same, which is beneficial to the overall temperature uniformity of the battery cluster.

[0055] Continue to refer Figures 1 to 5, the first cooling pipe 31 and the second cooling pipe 32 are arranged side by side on the same outer side of the battery cluster 1, each layer of the battery pack 12 includes a box 16 and a first battery module 13 and a second battery module 14 arranged inside the box 16, the first battery module 13 and the second battery module 14 are arranged side by side along the length direction or the width direction of the battery cluster 1, the first cooling pipe 31 is arranged corresponding to the first battery module 13 and cools the first battery module 13, and the second cooling pipe 32 is arranged corresponding to the second battery module 14 and cools the second battery module 14. It can be understood that if only one cooling pipe is provided, the cooling pipe is provided close to any one of the first battery module 13 and the second battery module 14, and the other one of the first battery module 13 and the second battery module 14 is far away from the cooling pipe, which will cause a large temperature difference between different battery modules in the same battery pack, thereby affecting the service life of the battery pack 12. In the embodiment of the present application, the first cooling pipe 31 and the second cooling pipe 32 are respectively arranged corresponding to different battery modules in the same battery pack 12, thereby improving the temperature uniformity between different battery modules in the same battery pack. In other optional embodiments, if four battery modules are arranged side by side in the same battery pack, four cooling pipes can be arranged accordingly, wherein the cooling medium of two adjacent cooling pipes flows in opposite directions.

[0056] In some embodiments, continue to refer to Figure 5 and Figure 6 The box 16 of each battery pack 12 is provided with a first air inlet 151 and a second air inlet 152. The first air inlet 151 is provided corresponding to the first battery module 13, and the second air inlet 152 is provided corresponding to the second battery module 14. The first cooling pipe 31 is provided with a plurality of first air outlets 312 on the side facing the battery cluster 1, and each first air outlet 312 corresponds to a first air inlet 151. The second cooling pipe 32 is provided with a plurality of second air outlets 322 on the side facing the battery cluster 1, and each second air outlet 322 corresponds to a second air inlet 152. By setting the first air outlet 312 of the first cooling pipe 31 to be provided with the first air inlet 151 corresponding to the first battery module 13, the cooling air flowing out of the first cooling pipe 31 can be directly provided to the first battery module 13 through the first air inlet 151 to improve the cooling rate. By setting the second air outlet 322 of the second cooling pipe 32 to the second air inlet 152 corresponding to the second battery module 14, the cooling air flowing out of the second cooling pipe 32 can be directly provided to the second battery module 14 through the second air inlet 152 to improve the cooling rate.

[0057] Continue to refer Figure 5 and Figure 6Each group of first air outlets 312 includes a plurality of first air outlets 312, and the plurality of first air outlets 312 are arranged on the same axis; each group of second air outlets 322 includes a plurality of second air outlets 322, and the plurality of second air outlets 322 are arranged on the same axis; the central axis of each group of the plurality of first air outlets 312 is flush with the central axis of each group of the plurality of second air outlets 322.

[0058] Continue to refer Figure 1 , Figure 2 and Figure 6 The first cooling pipe inlet 311 is connected to the first cooling pipe interface 21 of the refrigerator 2, and the first cooling pipe interface 21 is arranged close to the bottom end surface 112 of the battery cluster 1. The first cooling pipe 31 includes a first cooling pipe interface section 313 and a first cooling pipe cooling section 314 which are bent and connected, wherein the first cooling pipe interface section 313 is arranged as a bent pipe structure, one end of the first cooling pipe interface section 313 is connected to the first cooling pipe interface 21, and the other end of the first cooling pipe interface 313 is connected to the first cooling pipe cooling section 314, and the first cooling pipe cooling section 314 is arranged as a straight pipe structure, and the first cooling pipe cooling section 314 extends from the bottom end surface 112 of the battery cluster 1 to the top end surface 111, so that the flow direction of the cooling medium in the first cooling pipe cooling section 314 is basically parallel to the height direction of the battery cluster 1, and the distance between the first cooling pipe cooling section 314 and each layer of battery packs of the battery cluster 1 is the same, which is conducive to improving the temperature uniformity of the first cooling pipe 31 to the first battery modules 13 corresponding to the battery packs 12 of different layers of the same battery cluster 1.

[0059] Continue to refer Figure 1 , Figure 2 and Figure 6 The second cooling pipe inlet 321 is connected to the second cooling pipe interface 22 of the refrigerator 2, and the second cooling pipe interface 22 is arranged close to the top end surface 111 of the battery cluster 1. The second cooling pipe 32 includes a second cooling pipe interface section 323 and a second cooling pipe cooling section 324 which are bent and connected, wherein the second cooling pipe interface section 323 is arranged as a bent pipe structure, one end of the second cooling pipe interface section 323 is connected to the second cooling pipe interface 22, and the other end of the second cooling pipe interface section 323 is connected to the second cooling pipe cooling section 324, and the second cooling pipe cooling section 324 is arranged as a straight pipe structure, and the second cooling pipe cooling section 324 extends from the top end surface 111 of the battery cluster 1 to the bottom end surface 112, so that the flow direction of the cooling medium in the second cooling pipe cooling section 324 is basically parallel to the height direction of the battery cluster 1, and the distance between the second cooling pipe cooling section 324 and each layer of battery packs of the battery cluster 1 is the same, which is conducive to improving the temperature uniformity of the second cooling pipe 32 between the second battery modules 14 corresponding to the battery packs 12 of different layers of the same battery cluster 1.

[0060] 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 first cooling pipe 31 and a second cooling pipe 32. The battery cluster 1 includes a multi-layer battery pack 12 arranged along the height direction of the battery cluster 1, each battery pack 12 includes a first battery module 13 and a second battery module 14 arranged side by side, the first cooling pipe 31 is configured to cool the first battery module 13, and the second cooling pipe 32 is configured to cool the second battery module 14. The first battery module 13 and the second battery module 14 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 17, and two temperature sampling points 18 are arranged on each single cell 17, 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 18 are provided in each battery pack 12.

[0061] 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 flow of the cooling medium in the first cooling pipe 31 and / or the second cooling pipe 32 to adjust the temperature of the first battery module and / or the second battery module of the battery pack of the energy storage system, thereby achieving temperature balance between the first battery module and the second battery module in the same battery pack of the energy storage system.

[0062] 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, each battery pack 12 includes a first battery module 13 and a second battery module 14, each battery pack 12 corresponds to a battery pack monitoring unit 6, five battery packs 12 correspond to 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 18 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 all temperature sampling points 18 of the first battery module 13 in the corresponding battery pack 12, and obtains the temperature data of all temperature sampling points 18 of the second battery module 14 in the same battery pack 12 and transmits it to the battery cluster management system 5. The battery cluster management system 5 is used to control the flow of cooling medium in the first cooling pipe 31 and / or the second cooling pipe 32 according to the temperature data of the multiple temperature sampling points 18 of the first battery module 13 and the temperature data of the multiple temperature sampling points 18 of the second battery module 14 .

[0063] The flow of the cooling medium in the first cooling pipe 31 is controlled based on the temperature data of the multiple temperature sampling points 18 of the first battery module 13. Since the flow parameters of the cooling medium in the first cooling pipe 31 change, the cooling effect of the first cooling pipe 31 on the first battery module 13 changes. The flow of the cooling medium in the second cooling pipe 32 is controlled based on the temperature data of the multiple temperature sampling points 18 of the second battery module 14. Since the cooling effect of the second cooling pipe 32 on the second battery module 14 changes, the cooling effect of the second cooling pipe 32 on the second battery module 14 changes, thereby maintaining temperature balance between the first battery module 13 and the second battery module 14 of each layer of battery pack 12.

[0064] In one embodiment, after collecting temperature data of multiple temperature sampling points 18 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 18 corresponding to the left and right poles of each single battery 17, the module mean and module range of the multiple temperature sampling points corresponding to the first battery module and the second battery module, and further calculate the battery pack mean and battery pack range based on the temperature data of the multiple temperature sampling points corresponding to each battery pack, 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 multiple temperature sampling points 18 of the entire energy storage system.

[0065] When the battery cluster management system 5 sets the energy storage system to operate normally, the pole temperature of the single cell must not exceed the preset temperature range, which is 25±5°C. The module mean calculated based on the temperature data of multiple temperature sampling points of the same battery module must not exceed the preset temperature range. The battery pack mean calculated based on the temperature data of multiple temperature sampling points of the same battery pack must not exceed the preset temperature range. The battery cluster mean calculated based on the temperature data of multiple temperature sampling points of the same battery cluster does not exceed the preset temperature range. When the battery cluster management system 5 detects that the battery cluster mean exceeds 30°C or is less than 20°C, the battery cluster is powered off and the battery cluster fault is checked to prevent the battery cluster from overheating as a whole and affecting the service life of the battery cluster. When the battery cluster management system 5 detects that the battery pack mean exceeds 30°C or is less than 20°C, the battery pack is powered off and the battery pack fault is checked in parallel, thereby preventing the battery pack from overheating and affecting the service life of the battery cluster.

[0066] The module extreme difference calculated based on the temperature data of multiple temperature sampling points in the same battery module shall not be greater than the first preset temperature difference, which is 1°C. The battery pack extreme difference calculated based on the temperature data of multiple temperature sampling points in the same battery pack shall not be greater than the second preset temperature difference, which is 3°C. The battery extreme difference calculated based on the temperature of the two poles of the same single cell shall not be greater than the third preset temperature difference, which is 0.5°C. The battery cluster extreme difference calculated based on the temperature data of multiple temperature sampling points of the same battery cluster shall not be greater than the fourth temperature difference, which is 5°C. When the battery cluster management system 5 detects that the battery cluster extreme difference of the energy storage system is greater than the fourth temperature difference, the battery cluster system is powered off and the fault is eliminated. When the battery cluster management system 5 detects that the battery pack extreme difference is greater than the second preset temperature difference, the battery pack is powered off and the fault is eliminated.

[0067] In some embodiments, when the module range obtained by the battery cluster management system 5 based on the temperature data of multiple temperature sampling points of the first battery module or the second battery module satisfies a value greater than the first preset difference and less than the second preset difference, the battery cluster management system 5 is configured to adjust the flow rate of the cooling medium flowing out of the multiple groups of first air outlets of the first cooling pipe 31, and adjust the flow rate of the cooling medium flowing out of the multiple groups of second air outlets of the second cooling pipe 32 to achieve temperature balance between the first battery module and the second battery module.

[0068] Specifically, the battery pack monitoring unit obtains the module range difference between the first battery module and the second battery module in the battery pack based on the temperature data of multiple temperature sampling points in the same battery pack, and the battery cluster management system adjusts the flow rate of the cooling medium in the first cooling pipe 31 or the flow rate of the cooling medium in the second cooling pipe 32 according to the module range difference between the first battery module and the second battery module in the same battery pack.

[0069] When the module range difference of the first battery module 13 exceeds the first preset difference, that is, the temperature difference between the multiple single batteries 17 in the first battery module 13 is large, by controlling the flow rate of the cooling medium of the first cooling pipe 31 corresponding to the first battery module 13, for example, when the cooling medium is wind, the air volume of the first cooling pipe 31 is controlled to increase, thereby strengthening the cooling of the first battery module 13, thereby reducing the module range difference of the first battery module 13, so that the temperature difference between the first battery module 13 and the second battery module 14 in the same battery pack 12 is smaller. Similarly, when the module range difference of the second battery module 14 exceeds the first preset difference, that is, the temperature difference between the multiple single cells 17 in the second battery module 14 is large, by controlling the flow rate of the cooling medium of the second cooling pipe 32 corresponding to the second battery module 14, for example, when the cooling medium is wind, the air volume of the second cooling pipe 32 is controlled to increase, thereby strengthening the cooling of the second battery module 14, thereby reducing the module range difference of the second battery module 14, so that the temperature difference between the first battery module 13 and the second battery module 14 in the same battery pack 12 is smaller.

[0070] When the module range difference of the first battery module of the same battery pack is greater than the first preset difference and less than the second preset difference, wherein the first preset difference is 1°C and the second preset difference is 3°C, the battery cluster management system 5 adjusts the flow rate of the cooling medium in the first cooling pipe 31 .

[0071] The flow rate of the cooling medium after adjustment at the first air outlet of the first cooling pipe 31 is set to L1x, the flow rate of the cooling medium before adjustment at the first air outlet is set to L1y, the time for the battery cluster management system 5 to adjust the flow rate of the cooling medium in the cooling pipe is t, the maximum temperature of the pole of the single battery 17 in the first battery module 13 is X1max, the maximum temperature threshold of the pole temperature of the single battery 17 is Y1, Y1 is 30°C, and the absolute value of the difference between the number of layers of the battery pack where the first battery module with abnormal module polarity is located and the number of layers corresponding to the inlet of the first cooling pipe is set to H, then L1x satisfies the following relationship:

[0072]

[0073] Among them, L1x>L1y, 1≤H≤10, 1s≤t≤10s.

[0074] It should be noted that the battery cluster management system 5 controls the flow rate of the cooling medium of the first cooling pipe 31 by controlling the flow rate of the cooling medium of the first cooling pipe interface 21 of the refrigerator 2. Therefore, the adjustment of the flow rate of the cooling medium of the first cooling pipe 31 corresponding to the first battery module 13 with abnormal temperature needs to consider the absolute value H of the difference between the number of layers of the battery pack where the abnormal battery module is located and the number of layers of the battery pack corresponding to the inlet of the corresponding cooling pipe. For example, the inlet of the first cooling pipe is located at the bottom of the battery cluster. When the abnormal first battery module is close to the bottom of the battery cluster, H is small, and the flow rate L1x of the cooling medium adjusted at the first air outlet of the first cooling pipe 31 is correspondingly small. When the abnormal first battery module is far away from the bottom of the battery cluster, H is large, and the flow rate L1x of the cooling medium adjusted at the first air outlet of the first cooling pipe 31 is large, thereby achieving precise temperature control.

[0075] In some embodiments, the battery cluster management system 5 obtains the battery extreme difference of the single battery in the same battery module based on the temperature data of multiple temperature sampling points of the same battery module, and the battery cluster management system 5 adjusts the temperature of the cooling medium of the first cooling pipe 31 and the temperature of the cooling medium of the second cooling pipe 32 according to the battery extreme difference. When a single battery in the battery module is locally overheated, the battery extreme difference of the single battery correspondingly exceeds the third preset difference, and the battery module is cooled more by controlling the temperature of the cooling medium in the cooling pipe corresponding to the battery module, so that the single battery with abnormal temperature in the battery module is fully cooled, thereby achieving temperature balance among multiple single batteries in the battery module.

[0076] In a specific implementation, when the battery extreme difference in the first battery module is greater than the third preset difference, the third preset difference is 0.5°C, in order to prevent the single battery in the first battery module from being damaged due to local overheating, thereby affecting the service life of the battery cluster, the temperature of the cooling medium in the first cooling pipe corresponding to the first battery module is controlled to be lowered, thereby strengthening the cooling of the first battery module, so that the single battery with abnormal temperature in the first battery module is fully cooled. Similarly, when the battery extreme difference in the second battery module is greater than the third preset difference, in order to prevent the single battery in the second battery module from being damaged due to local overheating, thereby affecting the service life of the battery cluster, the temperature of the cooling medium in the second cooling pipe corresponding to the second battery module is controlled to be lowered, thereby strengthening the cooling of the second battery module, so that the single battery with abnormal temperature in the second battery module is fully cooled.

[0077] Specifically, the battery cluster management system calmly controls the temperature of the cooling medium in the first cooling pipe 31 by adjusting the temperature of the cooling medium flowing out of the first cooling pipe interface, and the battery cluster management system controls the temperature of the cooling medium in the second cooling pipe 32 by adjusting the temperature of the cooling medium flowing out of the second cooling pipe interface.

[0078] The temperature of the cooling medium flowing out of the first cooling pipe interface after adjustment is set as C1x, the temperature of the cooling medium flowing out of the first cooling pipe interface before adjustment is set as C1y, the time required for the battery cluster management system to adjust the temperature of the cooling medium is set as t, the highest temperature of multiple temperature sampling points of multiple single cells in the first battery module is set as X1max, the highest temperature threshold of the single cell is set as Y1, and the absolute value of the difference between the number of layers of the battery pack where the battery module corresponding to the single cell with abnormal battery polarity is located and the number of layers of the battery pack corresponding to the inlet of the first cooling pipe is set as H, then C1x satisfies the following relationship:

[0079]

[0080] Among them, C1x<C1y, 1≤H≤10, 1s≤t≤10s.

[0081] It should be noted that the battery cluster management system 5 controls the temperature of the cooling medium of the first cooling pipe 31 by controlling the temperature of the cooling medium of the first cooling pipe interface 21 of the refrigerator 2. Therefore, the adjustment of the temperature of the cooling medium of the first cooling pipe 31 corresponding to the first battery module 13 with abnormal battery polarity needs to consider the absolute value H of the difference between the number of layers of the battery pack where the battery module with abnormal battery polarity is located and the number of layers of the battery pack corresponding to the inlet of the corresponding cooling pipe. For example, the inlet of the first cooling pipe is located at the bottom of the battery cluster. When the first battery module with abnormal battery polarity is close to the bottom of the battery cluster, H is small, and the flow rate L1x of the cooling medium adjusted at the first air outlet of the first cooling pipe 31 is correspondingly large. When the abnormal first battery module is far away from the bottom of the battery cluster, H is large, and the temperature L1x of the cooling medium adjusted at the first air outlet of the first cooling pipe 31 is correspondingly small, thereby achieving precise temperature adjustment.

[0082] 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:

[0083] S100, acquiring 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;

[0084] S200: Regulate the flow of the cooling medium in the first cooling pipeline and / or the second cooling pipeline according to the temperature data.

[0085] A first cooling pipe is provided to cool the first battery module of each layer of battery pack of the battery cluster, and a second cooling pipe is provided to cool the second battery module of each layer of battery pack of the battery cluster. The flow of the cooling medium of the first cooling pipe is controlled according to the temperature data of multiple temperature sampling points of the first battery module, and the flow of the cooling medium of the second cooling pipe is controlled according to the temperature data of multiple temperature sampling points of the second battery module, so that the temperature of the first battery module and the second battery module of each layer of battery pack is balanced.

[0086] In some embodiments, Fig.10 As shown, the thermal management method of the energy storage system also includes:

[0087] S110, obtaining the module range of the battery modules in the same battery pack according to the multiple temperature data; wherein S200 includes:

[0088] S210, adjusting the flow rate of the cooling medium in the first cooling pipeline and / or the second cooling pipeline according to the module range difference.

[0089] Taking the same battery pack including the first battery module and the second battery module as an example, the module range of the first battery module is the difference between the highest temperature and the lowest temperature in the temperature data of multiple temperature sampling points in the first battery module. The module range can be used to see the temperature balance among multiple single batteries in the first battery module. The flow rate of the cooling medium in the first cooling pipe and / or the second cooling pipe is adjusted by the module range, so as to achieve temperature balance between each battery module in the same battery pack and temperature balance of multiple single batteries in the same battery module.

[0090] In some embodiments, Fig.11 As shown, S210 includes:

[0091] S211. When the module range difference of the first battery module is greater than the first preset difference and less than the second preset difference, adjust the flow rate of the cooling medium in the first cooling pipe.

[0092] Specifically, the first preset difference is the module range set by the battery cluster management system, and the second preset difference is the battery pack range set by the battery cluster management system. When the module range of the first battery module exceeds the preset module range, corresponding to the large temperature difference between multiple single cells in the first battery module, the module range of the first battery module is reduced by adjusting the flow rate of the cooling medium of the first cooling pipe corresponding to the first battery module, for example, by increasing the flow rate of the cooling medium of the first cooling pipe to enhance the cooling effect of the first cooling pipe on the first battery module. The module range of the first battery module is reduced to meet the module range requirement set by the battery cluster management system.

[0093] It should be noted that when the module range difference of the first battery module is greater than the second preset difference, the battery cluster management system controls the battery pack to power off and checks multiple single cells in the battery pack to prevent the single cells in the battery pack from being damaged due to excessive temperature, thereby affecting the service life of the battery cluster.

[0094] In some embodiments, Fig.12 As shown, the thermal management method of the energy storage system includes:

[0095] S120, obtaining battery ranges of multiple single cells in the same battery module according to multiple temperature data; wherein S200 includes:

[0096] S220: Adjust the temperature of the cooling medium in the first cooling pipe and / or the second cooling pipe according to the battery extreme difference.

[0097] The same battery module includes multiple single cells, each of which is provided with two or more temperature sampling points. The battery extreme difference is calculated based on the highest temperature and the lowest temperature in the temperature data of the two or more temperature sampling points. The battery extreme difference can be used to show the temperature balance between the various temperature measuring points of the single cell. When the battery extreme difference is too large, it indicates that the single cell is locally overheated. The battery extreme difference is used to adjust the temperature of the cooling medium of the first cooling pipe and / or the second cooling pipe corresponding to the battery module where the single cell with abnormal battery extreme difference is located, thereby adjusting the temperature balance between the various temperature measuring points of the single cell to prevent the single cell from being damaged due to local overheating, thereby improving the service life of the battery module.

[0098] In some embodiments, the first cooling pipe is connected to a first cooling pipe interface of the refrigerator, and the second cooling pipe is connected to a second cooling pipe interface of the refrigerator. Fig.13 As shown, S220 includes:

[0099] S221. When the battery range difference of the first battery module is greater than a third preset difference, adjust the temperature of the cooling medium flowing out of the first cooling pipe interface connected to the first cooling pipe corresponding to the first battery module.

[0100] The third preset difference is the battery extreme value set by the battery cluster management system. When the battery extreme value of the first battery module is greater than the third preset difference, there is local overheating of the single battery in the first battery module. By adjusting the temperature of the cooling medium flowing out of the first cooling pipe interface, the cooling effect of the first cooling pipe on the first battery module is enhanced, which is beneficial to adjust the battery extreme value of the first battery module to reduce the battery extreme value requirement set by the battery cluster management system, thereby improving the service life of the battery module.

[0101] In a specific implementation, the battery mean value calculated from the temperature data of two or more temperature sampling points of each single battery is set to X, and the temperature mean values ​​of the multiple single batteries in the battery cluster are respectively X1~Xn. The module mean value calculated from the temperature data of multiple temperature sampling points of the same battery module is set to Y, and the module mean values ​​of the multiple battery modules in the battery cluster are respectively Y1~Yn. The battery pack mean value calculated from the temperature data of multiple temperature sampling points of the same battery pack is set to Z, and the mean values ​​of the multiple battery packs in the battery cluster are respectively Z1~Zn, the battery cluster mean value calculated from the temperature data of multiple temperature sampling points of the battery cluster is set to P, and the difference between the highest temperature and the lowest temperature in the temperature data of multiple temperature sampling points of the battery cluster is set to be the battery cluster extreme difference Q.

[0102] In a specific implementation, the temperature adjustment method of the battery cluster management system includes a first temperature adjustment method strategy:

[0103] When the battery cluster management system detects that any value of X1 to Xn is greater than 30°C, the battery cluster management system locates the battery module and battery pack where the single cell is located, compares the module mean value Y of the battery module with 30°C, and makes adjustments in the following two ways according to the comparison between the module mean value of the battery module and 30°C:

[0104] Adjustment method A: When the module average temperature of the battery module is greater than 30°C or less than 20°C, the battery cluster management system cuts off the power to the battery pack and checks the single cells in the battery module at the same time.

[0105] Adjustment method B: When the module mean value of the battery module is between 20°C and 30°C, the battery cluster management system detects the battery extreme difference of the single battery of the battery module, and adjusts in the following two ways according to the comparison between the battery extreme difference of the single battery in the battery module and the third preset difference:

[0106] Adjustment method B1: When the battery extreme value of a single cell is greater than the third preset difference and less than the first preset difference, the battery cluster management system controls the power of the energy storage system to be adjusted to 0.5 times the previous value, and at the same time adjusts the temperature of the cooling medium of the pipe interface of the refrigerator corresponding to the cooling pipe corresponding to the battery module with the abnormal battery extreme value.

[0107] Adjustment method B2: When the battery extreme difference of a single cell is greater than a first preset difference, the battery cluster management system cuts off power to the battery pack and checks the single cell.

[0108] The temperature regulation method of the battery cluster management system includes the second temperature regulation method strategy:

[0109] Adjustment method C: When the battery cluster management system detects that the battery pack extreme difference of the battery pack is greater than the second preset difference, the battery cluster management system locates the single cell with the highest temperature and the single cell with the lowest temperature, and adjusts in the following two ways according to the comparison between the highest temperature and the lowest temperature and 25±5℃:

[0110] Adjustment method C1: When one or both of the highest temperature and the lowest temperature are not within the temperature range of 25±5℃, the first temperature adjustment method strategy mentioned above is followed;

[0111] Adjustment method C2: When the maximum temperature and the minimum temperature are both within the temperature range of 25±5°C, the module range of the first battery module and the second battery module in the battery pack is compared, and adjustment is performed in the following two ways according to the comparison between the module range of the first battery module and the second battery module and the first preset difference:

[0112] Adjustment mode C21: when the module range difference of the first battery module and / or the second battery module is greater than the second preset difference, the battery pack is powered off and the single cells are inserted in parallel;

[0113] Adjustment method C22: When the module range difference of the first battery module and / or the second battery module is greater than the first preset difference and less than the second preset difference, taking the first battery module as an example, the battery cluster management system controls the flow rate of the cooling medium of multiple groups of first air outlets of the first cooling pipe corresponding to the first battery module.

[0114] 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 scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A thermal management method for an energy storage system, characterized in that: The energy storage system includes at least one battery cluster, a first cooling pipe and a second cooling pipe; the battery cluster includes a multi-layer battery pack arranged along the height direction of the battery cluster, each of the battery packs includes a first battery module and a second battery module arranged side by side, the first cooling pipe is configured to cool the first battery module, the second cooling pipe is configured to cool the second battery module, the first battery module and the second battery module each include a plurality of single cells, each of the single cells is provided with at least one temperature sampling point, and the thermal management method includes: 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 flow of the cooling medium in the first cooling channel and / or the second cooling channel is regulated according to the temperature data.

2. The thermal management method of the energy storage system according to claim 1, characterized in that: The thermal management method further comprises: Obtaining a module extreme difference of the battery modules in the same battery pack according to a plurality of temperature data; Wherein, regulating the flow of the cooling medium in the first cooling pipeline and / or the second cooling pipeline according to the temperature data comprises: The flow rate of the cooling medium in the first cooling pipeline and / or the second cooling pipeline is adjusted according to the module range difference.

3. The thermal management method of the energy storage system according to claim 2, characterized in that: The step of adjusting the flow rate of the cooling medium in the first cooling pipeline and / or the second cooling pipeline according to the module range difference includes: When the module range difference of the first battery module is greater than the first preset difference and less than the second preset difference, the flow rate of the cooling medium in the first cooling pipe is adjusted.

4. The thermal management method of the energy storage system according to claim 1, characterized in that: The thermal management method comprises: Obtaining the battery range of the single battery in the same battery module according to a plurality of temperature data, and adjusting the flow of the cooling medium in the first cooling pipe and / or the second cooling pipe according to the temperature data comprises: The temperature of the cooling medium in the first cooling channel and / or the second cooling channel is adjusted according to the battery extreme difference.

5. The thermal management method of the energy storage system according to claim 4, characterized in that: The first cooling pipeline is connected to a first cooling pipeline interface of a refrigerator, and the second cooling pipeline is connected to a second cooling pipeline interface of the refrigerator. The step of adjusting the temperature of the cooling medium of the first cooling pipeline and / or the second cooling pipeline according to the battery range difference includes: When the battery range difference of the first battery module is greater than a third preset difference, the temperature of the cooling medium flowing out of the first cooling pipe interface connected to the first cooling pipe corresponding to the first battery module is adjusted.

6. A thermal management device for an energy storage system, characterized in that: The energy storage system includes at least one battery cluster, a first cooling pipe and a second cooling pipe; the battery cluster includes a multi-layer battery pack arranged along the height direction of the battery cluster, each of the battery packs includes a first battery module and a second battery module arranged side by side, the first cooling pipe is configured to cool the first battery module, the second cooling pipe is configured to cool the second battery module, the first battery module and the second battery module each include a plurality of single cells, each of the single cells is provided with at least one temperature sampling point, and the thermal management device includes: 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 flow of cooling medium in the first cooling pipe and / or the second cooling pipe according to the temperature data of multiple temperature sampling points of the first battery module and the temperature data of multiple temperature sampling points of the second battery module.

7. The thermal management device according to claim 6, characterized in that: The first cooling duct includes multiple groups of first air outlets, the second cooling duct includes multiple groups of second air outlets, the battery pack includes a box body, the box body is provided with a first air inlet and a second air inlet, the first air inlet corresponds to the first battery module, the second air inlet corresponds to the second battery module, each group of the first air outlets is arranged corresponding to the first air inlet, and each group of the second air outlets is arranged corresponding to the second air inlet, and the battery cluster management system is configured to adjust the flow rate of the cooling medium flowing out of the first air outlet and / or the second air outlet.

8. The thermal management device according to claim 7, characterized in that: The battery pack monitoring unit is further used to obtain the module range difference of the battery modules in the same battery pack according to multiple temperature data, and the battery cluster management system is further used to adjust the flow rate of the cooling medium in the first cooling pipe and / or the second cooling pipe according to the module range difference.

9. The thermal management device according to claim 8, characterized in that: When the module range difference of the first battery module is greater than a first preset difference and less than a second preset difference, the battery cluster management system adjusts the flow rate of the cooling medium in the first cooling pipe.

10. The thermal management device according to claim 9, characterized in that: The flow rate after adjustment of the first air outlet is set to L1x, the flow rate before adjustment of the first air outlet is set to L1y, the time required for the battery cluster management system to adjust the flow rate is set to t, the maximum temperature of the single battery in the first battery module is set to X1max, the maximum temperature threshold of the single battery is set to Y1, and the absolute value of the difference between the number of layers of the battery pack where the first battery module is located and the number of layers of the battery pack corresponding to the inlet of the first cooling pipe is set to H, then L1x satisfies the following relationship: Among them, L1x>L1y, 1≤H≤10, 1s≤t≤10s.

11. The thermal management device according to claim 6, characterized in that: The first cooling duct includes multiple groups of first air outlets, the second cooling duct includes multiple groups of second air outlets, the battery pack includes a box body, the box body is provided with a first air inlet and a second air inlet, the first air inlet corresponds to the first battery module, the second air inlet corresponds to the second battery module, each group of the first air outlets is arranged corresponding to the first air inlet, and each group of the second air outlets is arranged corresponding to the second air inlet, the first cooling duct is connected to a first cooling duct interface of a refrigerator, the second cooling duct is connected to a second cooling duct interface of the refrigerator, and the battery cluster management system is configured to adjust the temperature of the cooling medium flowing out of the first cooling duct interface and / or the second cooling duct interface.

12. The thermal management device according to claim 11, characterized in that: The battery pack monitoring unit is also used to obtain the battery extreme difference of the single battery in the same battery module according to multiple temperature data, and the battery cluster management system adjusts the temperature of the cooling medium of the first cooling pipe and / or the second cooling pipe according to the battery extreme difference.

13. The thermal management device according to claim 12, characterized in that: When the battery range difference of the first battery module is greater than a third preset difference, the battery cluster management system adjusts the temperature of the cooling medium flowing out of the first cooling pipe interface connected to the first cooling pipe corresponding to the first battery module.

14. The thermal management device according to claim 13, characterized in that: The temperature of the cooling medium flowing out of the first cooling pipe interface after adjustment is set to C1x, the temperature of the cooling medium flowing out of the first cooling pipe interface before adjustment is set to C1y, the time required for the battery cluster management system to adjust the temperature is set to t, the maximum temperature of the single battery in the first battery module is set to X1max, the maximum temperature threshold of the single battery is set to Y1, and the absolute value of the difference between the number of layers of the battery pack where the first battery module is located and the number of layers of the battery pack corresponding to the inlet of the first cooling pipe is set to H, then C1x satisfies the following relationship: Among them, C1x<Y<C1y, 1≤H≤10, 1s≤t≤10s.

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