Temperature control method, temperature control system and energy storage device

Abstract

The application discloses a temperature control method, a temperature control system and an energy storage device. The temperature control method is applied to the energy storage device. The temperature control method comprises the following steps: collecting the in-pack environment temperature of each battery pack and the current temperature of each battery cell in each battery pack in real time; determining a first temperature difference between the current temperature of each battery cell and a preset working temperature; determining a second temperature difference between the in-pack environment temperature and the preset working temperature of the battery cell; and adjusting at least one of the wind guide angle of each wind guide structure and the operation state of the ventilation device according to the first temperature difference and the second temperature difference. The temperature control method can improve the temperature consistency of multiple single battery cells in the battery pack while controlling the overall temperature of the battery pack.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, and in particular to a temperature control method, a temperature control system and an energy storage device. BACKGROUND

[0002] Traditional energy storage devices use centralized temperature control methods to control the temperature inside the energy storage device. However, centralized control of the temperature inside the energy storage device results in large differences in the heat dissipation effect of the battery cells inside the energy storage device, leading to large temperature differences between the battery cells inside the energy storage device, which in turn affects the performance and lifespan of the battery cells, and thus affects the performance, lifespan and use safety of the energy storage device. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application proposes a temperature control method that can improve the temperature consistency of multiple single battery cells in a battery pack while controlling the overall temperature of the battery pack.

[0004] The present application also proposes a temperature control system.

[0005] The present application also proposes an energy storage device using the above-mentioned temperature control method.

[0006] The present application also proposes a computer-readable storage medium using the above-mentioned temperature control method.

[0007] According to the temperature control method of the present application, the temperature control method is applied to an energy storage device, the energy storage device includes at least one battery pack, each battery pack includes multiple battery cells, at least one ventilation device is provided on each battery pack, each battery cell in each battery pack is provided with a corresponding air guide structure, and the air guide angle of each air guide structure can be independently adjusted to adjust the ventilation area towards each battery cell; the temperature control method includes:

[0008] S1: Real-time collection of the in-pack ambient temperature of each battery pack and the current temperature of each battery cell in each battery pack;

[0009] S2: Determining the first temperature difference between the current temperature of each battery cell and the preset working temperature;

[0010] S3: Determining the second temperature difference between the in-pack ambient temperature and the preset working temperature of the battery cell;

[0011] S4: Adjusting at least one of the air guide angle of each air guide structure and the operating state of the ventilation device according to the first temperature difference and the second temperature difference.

[0012] According to the temperature control method, the air guiding angle of the air guiding structure is controlled to adjust the air ventilation area towards the battery cell, so as to change the heat dissipation condition of the battery cell, and make the first temperature difference between the current temperature of each battery cell and the preset working temperature consistent, that is, the temperature of different battery cells is consistent. After improving the consistency of the battery cell temperature, the running state of the ventilation device is adjusted to adjust the heat dissipation condition of the whole battery pack, so as to reduce the second temperature difference between the in-pack environment temperature of the battery pack and the preset working temperature of the battery cell, while ensuring that the first temperature difference of each battery cell is consistent, so that the temperature distribution in the battery pack is relatively uniform, and the in-pack environment temperature of the battery pack is close to the preset working temperature of the battery cell.

[0013] In some embodiments, the plurality of battery packs includes a first battery pack, and the plurality of battery cells in the first battery pack includes a first battery cell; and the adjusting at least one of the air guiding angle of each air guiding structure and the running state of the ventilation device according to the first temperature difference and the second temperature difference includes: when the first temperature difference is within a first preset range at a first preset time, maintaining the first air guiding angle of the first air guiding structure corresponding to the first battery cell at a first angle, and maintaining the ventilation device corresponding to the first battery pack at a first air speed; during a process from the first preset time to a second preset time, if the first temperature difference exceeds the first preset range and the second temperature difference is within a second preset range, increasing the first air guiding angle corresponding to the first battery cell from the first angle to a second angle to increase the air ventilation area; at least one boundary value of the first preset range is greater than a boundary value of the second preset range; during a process from the second preset time to a third preset time, if the first temperature difference decreases to be within the first preset range, the first air guiding angle is reduced to recover to the first angle. Thus, without adjusting the overall heat dissipation condition of the battery pack, the heat dissipation condition of the first battery cell is dynamically controlled, so that the first temperature difference of the first battery cell is within the first preset range, and the temperature consistency between each battery cell is improved.

[0014] In some embodiments, after the first temperature difference is within the first preset range at the first preset time, the first air guide angle corresponding to the first battery cell is kept at the first angle, and the ventilation device corresponding to the first battery pack is kept at the first wind speed, the method further comprises: during a process from the first preset time to the second preset time, if the second temperature difference exceeds the second preset range, increasing the first air guide angle from the first angle to the second angle to increase the ventilation area, and increasing the ventilation device corresponding to the first battery pack from the first wind speed to a second wind speed; during a process from the second preset time to the third preset time, if the first temperature difference decreases to be within the first preset range, decreasing the first air guide angle to recover to the first angle, and decreasing the ventilation device from the second wind speed to recover to the first wind speed. In this way, by adjusting the wind speed of the ventilation device to adjust the overall heat dissipation condition in the battery pack, and by adjusting the first air guide angle to adjust the current temperature of each battery cell, the actual temperature in the battery pack and the current temperature of each battery cell can be adjusted synchronously, and the adjustment speed of the actual temperature in the battery pack and the current temperature of each battery cell can be improved.

[0015] In some embodiments, after the first temperature difference is within the first preset range at the first preset time, the first air guide angle corresponding to the first battery cell is kept at the first angle, and the ventilation device corresponding to the first battery pack is kept at the first wind speed, the method further comprises: during a process from the first preset time to the second preset time, if the first temperature difference exceeds a third preset range, and the second temperature difference is within the second preset range, increasing the first air guide angle from the first angle to the second angle, and increasing a second air guide angle of a second air guide structure corresponding to a second battery cell adjacent to the first battery cell to a third angle to increase the ventilation area; wherein the third angle is less than or equal to the second angle. In this way, by increasing the second air guide angle of the second air guide structure corresponding to the second battery cell adjacent to the first battery cell to the third angle to increase the ventilation area, the heat dissipation condition of the second battery cell can be improved, the current temperature of the second battery cell can be reduced synchronously with the current temperature of the first battery cell, the descending speed of the current temperature of the first battery cell and the current temperature of the second battery cell can be improved, and the temperature consistency of the first battery cell and the second battery cell can be improved.

[0016] In some embodiments, the method further comprises: determining a number of target first battery cells in the first battery pack, the first temperature difference of which exceeds the first preset range; and increasing the first air guiding angle of each target first battery cell from the first angle to the second angle to increase the ventilation area, and increasing the ventilation device corresponding to the first battery pack from the first air speed to the second air speed, if the number of target first battery cells is greater than a preset threshold during the process from the first preset time to the second preset time. Thus, by simultaneously increasing the air speed of the ventilation device and the ventilation area of the target first battery cells, the heat dissipation conditions of the entire battery pack and the target first battery cells can be improved simultaneously, and the current temperature control speed of the target first battery cells can be improved.

[0017] In some embodiments, the ventilation device is an air extraction device. Thus, the air extraction device can drive the airflow to flow from the battery pack to the outside of the battery pack, so that the heat in the battery pack can be carried by the airflow to the outside of the battery pack for dissipation, thereby making the air extraction device have a better heat dissipation effect on the battery pack.

[0018] Further, the plurality of battery cells are arranged side by side and spaced apart along the length direction of the battery pack in the battery pack, a ventilation air duct along the width direction of the battery pack is formed between two adjacent battery cells, and ventilation holes are formed in the two side walls of the battery pack along the width direction, the ventilation holes corresponding to the ventilation air duct. Thus, the arrangement of the ventilation holes can increase the airflow flowing into the ventilation channel, thereby improving the adjustment speed of the current temperature of each battery cell by the airflow.

[0019] Further, the two side walls of the battery pack along the width direction are provided with the air guiding structure corresponding to the two ends of the ventilation channel, the air guiding structure being used for guiding the airflow passing through the ventilation holes to the battery cells. Thus, by adjusting the airflow passing through the ventilation holes and flowing to the battery cells through the air guiding structure, the flow amount of the airflow flowing to the battery cells can have a larger adjustment range, thereby improving the flexibility of the current temperature adjustment of the battery cells.

[0020] The temperature control system according to the embodiment of the present application is applied to an energy storage device, the energy storage device comprises at least one battery pack, each battery pack comprises a plurality of battery cells, at least one ventilation device is arranged on each battery pack, and each battery cell in each battery pack is correspondingly provided with a wind guide structure. The wind guide angle of each wind guide structure can be independently adjusted to adjust the ventilation area towards each battery cell. The temperature control system comprises: a temperature acquisition module, configured to acquire the current temperature of each battery cell and the in-pack environment temperature of the battery pack in real time; a temperature calculation module, configured to calculate the first temperature difference between the current temperature of each battery cell and the preset working temperature, and the second temperature difference between the in-pack environment temperature and the preset working temperature of the battery cell; and a temperature adjustment module, configured to adjust at least one of the wind guide angle of each wind guide structure and the operating state of the ventilation device according to the first temperature difference and the second temperature difference.

[0021] According to the temperature control system of the embodiment of the present application, the current temperature of each battery cell and the in-pack environment temperature of the battery pack are acquired by the temperature acquisition module, and the first temperature difference and the second temperature difference are calculated by the temperature calculation module. The temperature adjustment module changes the heat dissipation conditions of each battery cell and the whole battery pack by controlling the wind guide angle of the wind guide structure and the operating state of the ventilation device, so as to realize real-time regulation and control of the temperature of the battery cell and the battery pack, realize that the temperature of each battery cell in the battery pack is relatively consistent, and control the temperature of the battery pack to be close to the preset working temperature of the battery cell.

[0022] According to the energy storage device of the embodiment of the present application, the processor, the input device, the output device and the memory are connected with each other, wherein the memory is used for storing a computer program, the computer program comprises program instructions, and the processor is configured to invoke the program instructions and execute the temperature control method as described in the above embodiment.

[0023] According to the energy storage device of the embodiment of the present application, by executing the temperature control method of the above embodiment, the temperature distribution between the battery packs in the energy storage device is relatively average, the temperature distribution between the battery cells in the battery pack is also relatively uniform, and the in-pack environment temperature of each battery pack is controlled in a safe temperature range, so as to improve the temperature consistency and working safety of the whole energy storage device.

[0024] According to the computer readable storage medium of the embodiment of the present application, the computer readable storage medium stores a computer program, the computer program comprises program instructions, and the program instructions make the processor execute the temperature control method as described in the above embodiment when the processor executes the program instructions.

[0025] The computer readable storage medium according to the embodiment of the present application, by executing the temperature control method of the above-mentioned embodiment, realizes the adjustment of the actual temperature in the battery pack and the current temperature of each battery cell, improves the temperature consistency of each battery cell in the battery pack while controlling the overall temperature of the battery pack in the safe range.

[0026] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0027] The above-mentioned and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the accompanying drawings, in which:

[0028] Figure 1 is a flowchart of a temperature control method according to an embodiment of the present application;

[0029] Figure 2 is a structural schematic diagram of a temperature control system according to an embodiment of the present application;

[0030] Figure 3 is Figure 2 is an enlarged structural schematic diagram shown in A of FIG. 1;

[0031] Figure 4 is a module structural schematic diagram of a temperature control system according to an embodiment of the present application;

[0032] Figure 5 is a structural schematic diagram of an energy storage device according to an embodiment of the present application.

[0033] Reference Signs:

[0034] temperature control system 100,

[0035] ventilation device 11, air guide structure 12,

[0036] battery pack 13, battery cell 131,

[0037] temperature acquisition module 14, temperature calculation module 15, temperature adjustment module 16,

[0038] air guide angle a,

[0039] energy storage device 200. DETAILED DESCRIPTION

[0040] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0041] In the description of this invention, it should be understood that the terms "upper," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] The following description, with reference to the accompanying drawings, describes a temperature control method, a temperature control system 100, an energy storage device 200, and a computer-readable storage medium according to embodiments of the present invention.

[0044] like Figure 1 As shown, according to an embodiment of the present invention, the temperature control method is applied to an energy storage device 200. The energy storage device 200 includes at least one battery pack 13, each battery pack 13 includes multiple battery cells 131, each battery pack 13 is provided with at least one ventilation device 11, and each battery cell 131 in each battery pack 13 is correspondingly provided with an air guide structure 12. The air guide angle α of each air guide structure 12 can be independently adjusted to adjust the ventilation area towards each battery cell 131. The temperature control method includes:

[0045] S1: Real-time acquisition of the ambient temperature inside each battery pack, as well as the current temperature of each cell 131 in each battery pack;

[0046] S2: Determine the first temperature difference between the current temperature of each cell 131 and the preset operating temperature;

[0047] S3: Determine the second temperature difference between the ambient temperature inside the package and the preset operating temperature of the battery cell;

[0048] S4: Adjust at least one of the air guiding angle α of each air guiding structure 12 and the operating state of the ventilation device 11 according to the first temperature difference and the second temperature difference.

[0049] It should be noted that the ventilation device 11 can drive the air in the battery pack 13 to flow with the external air of the energy storage device 200 to dissipate heat inside the battery pack 13. In the same battery pack 13, the heat distribution between different battery cells 131 is affected by their positions in the battery pack 13, and in addition, due to individual differences between each battery cell 131, the heat generation of the battery cell 131 itself is different, resulting in uneven temperature distribution between each battery cell 131 in the battery pack 13, and the temperature distribution is prone to irregularity.

[0050] It should be noted that the preset working temperature of the battery cell 131 refers to the safe working temperature at which the battery cell 131 can maintain stable current output and the battery cell 131 does not occur thermal runaway.

[0051] It can be understood that the space in the battery pack 13 is large, when the current temperature of one of the battery cells 131 in the battery pack 13 is relatively high, the temperature of the battery cell 131 can be dispersed in part in the space of the battery pack 13, so that the ambient temperature in the battery pack 13 is lower than the current temperature of the battery cell 131, but the ambient temperature in the battery pack 13 is higher than the preset working temperature of the battery cell 131. At this time, the second temperature difference is smaller than the absolute value of the difference between the current temperature of the battery cell and the preset working temperature of the battery cell.

[0052] Therefore, when the current temperature of the battery cell is less than the preset working temperature of the battery cell, the ambient temperature in the battery pack 13 is also lower than the preset working temperature of the battery cell. When the ambient temperature in the battery pack 13 is greater than the preset working temperature of the battery cell, since the ambient temperature in the battery pack 13 is lower than the current temperature of the battery cell 131 at high temperature, the current temperature of the battery cell 131 must be greater than the preset working temperature of the battery cell.

[0053] The temperature control method of the present application can adjust the ventilation area towards the battery cell 131 by controlling the air guide angle a of the air guide structure 12, change the heat dissipation condition of the battery cell 131, make the first temperature difference between the current temperature and the preset working temperature of each battery cell 131 consistent, that is, make the temperature of different battery cells 131 consistent. After improving the temperature consistency of the battery cell 131, the running state of the ventilation device 11 is adjusted to adjust the heat dissipation condition of the whole battery pack 13, so that the second temperature difference between the ambient temperature in the battery pack 13 and the preset working temperature of the battery cell is reduced, while ensuring that the first temperature difference of each battery cell 131 is relatively consistent, so that the temperature distribution in the battery pack 13 is relatively uniform, and the ambient temperature in the battery pack 13 is close to the preset working temperature of the battery cell.

[0054] It should be noted that there is a special case between the actual temperature in the battery pack 13 and the current temperature of the battery cell. When the battery cell 131 is in thermal runaway, the thermal pressure gas in the battery cell 131 is discharged, and the heat of the battery cell 131 is dissipated to the space in the battery pack 13 through the thermal pressure gas, so that the actual temperature in the battery pack 13 is greater than the current temperature of the battery cell. But in this case, the battery cell 131 needs to be heated during the heating process, and the temperature control method of the application can control the current temperature of the battery cell 131 during the heating process of the battery cell 131, thereby reducing or avoiding the thermal runaway of the battery cell 131.

[0055] In some embodiments, as shown in Figure 2 、 Figure 3 The plurality of battery packs 13 includes a first battery pack, and the plurality of battery cells 131 in the first battery pack includes a first battery cell. The first temperature difference and the second temperature difference are adjusted to at least one of the wind guide angle α of each wind guide structure 12 and the operating state of the ventilation device 11, including:

[0056] When the first temperature difference is within the first preset range at the first preset time, the first wind guide angle of the first battery cell corresponding to the first wind guide structure is maintained at the first angle, and the ventilation device 11 corresponding to the first battery pack is maintained at the first wind speed. At this time, by maintaining the first wind guide angle at the first angle, the ventilation area of the first battery cell can be maintained, thereby maintaining the heat dissipation condition of the first battery cell, balancing the heat dissipation and heat generation of the first battery cell, and stabilizing the actual temperature of the battery cell.

[0057] During the process from the first preset time to the second preset time, if the first temperature difference exceeds the first preset range and the second temperature difference is within the second preset range, the first wind guide angle corresponding to the first battery cell is increased from the first angle to the second angle to increase the ventilation area. At least one boundary value of the first preset range is greater than the boundary value of the second preset range. At this time, the heat generation of the first battery cell is greater than the heat dissipation, and by increasing the first wind guide angle to the second angle, the ventilation area of the first battery cell can be increased, the heat dissipation of the first battery cell can be improved, and the heat dissipation of the first battery cell can be greater than the heat generation, thereby reducing the current temperature of the battery cell and reducing the first temperature difference.

[0058] During the process from the second preset time to the third preset time, if the first temperature difference decreases to the first preset range, the first wind guide angle is reduced to the first angle. At this time, the heat generation and heat dissipation of the first battery cell return to balance, the current temperature of the battery cell is stable, and the first temperature difference is maintained within the first preset range.

[0059] Therefore, without adjusting the overall heat dissipation condition of the battery pack 13, the heat dissipation condition of the first battery cell is dynamically adjusted, so that the first temperature difference of the first battery cell is within the first preset range, and the temperature consistency between the battery cells 131 is improved.

[0060] It should be noted that the first temperature difference exceeding the first preset range refers to the case that the current temperature of the first battery cell is higher than the preset working temperature of the battery cell. When the current temperature of the battery cell is lower than the preset working temperature of the battery cell, the first wind guide angle is adjusted to decrease to reduce the ventilation area of the first battery cell.

[0061] In some embodiments, after the first temperature difference is within the first preset range at the first preset time, the first wind guide angle corresponding to the first battery cell is kept at the first angle, and the ventilation device 11 is kept at the first wind speed, the method further comprises:

[0062] During the process from the first preset time to the second preset time, if the second temperature difference exceeds the second preset range, the first wind guide angle is increased from the first angle to the second angle to increase the ventilation area, and the ventilation device 11 corresponding to the first battery pack is increased from the first wind speed to the second wind speed.

[0063] It can be understood that when the battery cell 131 generates heat, the current temperature of the battery cell 131 is greater than the actual temperature in the battery pack, so that the first temperature difference is greater than the second temperature difference. When the second temperature difference exceeds the second preset range, the first temperature difference also necessarily exceeds the second preset range.

[0064] At this time, the in-pack environment temperature in the first battery pack is greater than the preset working temperature of the battery cell. By increasing the ventilation area of the battery cell 131 and increasing the wind speed of the ventilation device 11, the heat dissipation speed of each battery cell 131 in the first battery pack can be improved, so as to reduce the current temperature of each battery cell 131, reduce the in-pack environment temperature of the first battery pack, and reduce the second temperature difference and the first temperature difference.

[0065] During the process from the second preset time to the third preset time, if the first temperature difference decreases to be within the first preset range, the first wind guide angle is decreased to return to the first angle, and the ventilation device 11 is decreased from the second wind speed to return to the first wind speed. At this time, the first temperature difference decreases to be within the first preset range, and the second temperature difference also necessarily decreases to be within the first preset range, so that the in-pack environment temperature in the first battery pack and the current temperature of each battery cell are close to the preset working temperature of the battery cell.

[0066] Therefore, by adjusting the wind speed of the ventilation device 11 to adjust the overall heat dissipation condition in the battery pack 13, and by adjusting the first wind guide angle to adjust the current temperature of each battery cell in the battery pack 13, the actual temperature in the battery pack 13 and the current temperature of each battery cell 13 can be adjusted synchronously, and the adjustment speed of the actual temperature in the battery pack 13 and the current temperature of each battery cell 13 can be improved.

[0067] In some embodiments, after the first temperature difference is within the first preset range at the first preset time, the first air guide angle corresponding to the first battery cell is kept at the first angle, and the ventilation device 11 corresponding to the first battery pack is kept at the first wind speed, the method further comprises:

[0068] During the period from the first preset time to the second preset time, if the first temperature difference exceeds the third preset range and the second temperature difference is within the second preset range, the first air guide angle is increased from the first angle to the second angle, and the second air guide angle of the second air guide structure corresponding to the second battery cell adjacent to the first battery cell is increased to the third angle to increase the ventilation area. The third angle is less than or equal to the second angle.

[0069] It can be understood that when the first temperature difference exceeds the third preset range and the second temperature difference is within the second preset range, the current temperature of the first battery cell is higher than the in-pack environment temperature of the first battery pack. And the current temperature of the second battery cell adjacent to the first battery cell will rise under the influence of the first battery cell, and the current temperature of the second battery cell is less than or equal to the current temperature of the first battery cell.

[0070] Therefore, by adjusting the second air guide angle of the second air guide structure corresponding to the second battery cell adjacent to the first battery cell to increase to the third angle to increase the ventilation area, the heat dissipation condition of the second battery cell can be improved, the current temperature of the second battery cell can be synchronized with the current temperature of the first battery cell, the current temperature of the first battery cell and the current temperature of the second battery cell can be reduced, and the temperature consistency of the first battery cell and the second battery cell can be improved.

[0071] In some embodiments, the temperature control method further comprises: determining the number of target first battery cells whose first temperature difference exceeds the first preset range in the first battery pack.

[0072] During the period from the first preset time to the second preset time, if the number of target first battery cells is greater than the preset threshold, the first air guide angle corresponding to each target first battery cell is increased from the first angle to the second angle to increase the ventilation area, and the ventilation device 11 corresponding to the first battery pack is increased from the first wind speed to the second wind speed.

[0073] It can be understood that when the number of target first battery cells is greater than the preset threshold, the current temperature of the first battery cell is adjusted by adjusting the first air guide angle, and the current temperature of the first battery cell is adjusted at a slower speed.

[0074] Therefore, by simultaneously increasing the wind speed of the ventilation device 11 and increasing the ventilation area of the target first battery cell, the heat dissipation condition of the entire battery pack 13 and the target first battery cell can be improved simultaneously, and the current temperature control speed of the target first battery cell can be improved.

[0075] In some embodiments, the ventilation device 11 is an air extractor. Thus, the air extractor can drive the airflow from the battery pack 13 to the outside of the battery pack 13, so that the heat in the battery pack 13 can be carried by the airflow to the outside of the battery pack 13 to dissipate, so that the air extractor has a better heat dissipation effect on the battery pack 13.

[0076] Further, the plurality of battery cells 131 are arranged side by side and spaced apart along the length direction of the battery pack 13 in the battery pack 13, and a ventilation air duct along the width direction of the battery pack 13 is formed between the adjacent two battery cells 131. The two side walls of the battery pack 13 along the width direction are respectively provided with ventilation holes (not shown in the figure), which correspond to the ventilation air duct. Thus, the arrangement of the ventilation holes can increase the airflow flowing into the ventilation passage, thereby improving the adjustment speed of the airflow on the current temperature of each battery cell 131.

[0077] Further, the two side walls of the battery pack 13 along the width direction are provided with air guide structures 12 corresponding to the two ends of the ventilation passage, and the air guide structures 12 are used to guide the airflow passing through the ventilation holes to the battery cells 131. Thus, by adjusting the airflow passing through the ventilation holes and flowing to the battery cells 131 through the air guide structures 12, the airflow flowing to the battery cells 131 can have a larger adjustment range, thereby improving the flexibility of the current temperature adjustment of the battery cells 131.

[0078] As shown in Figure 2 , Figure 4 The temperature control system 100 according to the embodiments of the present application is applied to the energy storage device 200, the energy storage device 200 includes at least one battery pack 13, each battery pack 13 includes a plurality of battery cells 131, and each battery pack 13 is provided with at least one ventilation device 11. Each battery cell 131 in each battery pack 13 is provided with an air guide structure 12 corresponding thereto, and the air guide angle α of each air guide structure 12 can be independently adjusted to adjust the ventilation area towards each battery cell 131. The temperature control system 100 includes:

[0079] The temperature acquisition module 14 is used to acquire the current temperature of each battery cell 131 and the in-pack environment temperature of the battery pack 13 in real time.

[0080] The temperature calculation module 15 is used to calculate the first temperature difference between the current temperature of each battery cell 131 and the preset working temperature, and the second temperature difference between the in-pack environment temperature and the preset working temperature of the battery cell.

[0081] The temperature adjustment module 16 is used to adjust at least one of the air guide angle α of each air guide structure 12 and the operating state of the ventilation device 11 according to the first temperature difference and the second temperature difference.

[0082] The temperature control system 100 of the present application collects the current temperature of each battery cell 131 and the internal environment temperature of the battery pack 13 through the temperature collection module 14, and calculates the first temperature difference and the second temperature difference through the temperature calculation module 15. The temperature adjustment module 16 changes the heat dissipation conditions of each battery cell 131 and the whole battery pack 13 by controlling the wind guide angle a of the wind guide structure 12 and the operating state of the ventilation device 11, so as to realize the real-time regulation and control of the temperature of the battery cell 131 and the battery pack 13, realize the temperature consistency of each battery cell 131 in the battery pack 13, and control the temperature of the battery pack 13 close to the preset working temperature of the battery cell.

[0083] In some embodiments, the temperature adjustment module 14 is further configured to:

[0084] When the first temperature difference is within the first preset range at the first preset time, the first wind guide angle of the first battery cell corresponding to the first wind guide structure is maintained at the first angle, and the ventilation device 11 corresponding to the first battery pack is maintained at the first wind speed. At this time, by maintaining the first wind guide angle at the first angle, the ventilation area of the first battery cell can be maintained, thereby maintaining the heat dissipation condition of the first battery cell, balancing the heat dissipation and heat generation of the first battery cell, and stabilizing the actual temperature of the battery cell.

[0085] During the process from the first preset time to the second preset time, if the first temperature difference exceeds the first preset range and the second temperature difference is within the second preset range, the first wind guide angle corresponding to the first battery cell is increased from the first angle to the second angle to increase the ventilation area. At least one boundary value of the first preset range is greater than the boundary value of the second preset range. At this time, the heat generation of the first battery cell is greater than the heat dissipation, and by increasing the first wind guide angle to the second angle, the ventilation area of the first battery cell can be increased, the heat dissipation of the first battery cell can be improved, and the heat dissipation of the first battery cell is greater than the heat generation, thereby reducing the current temperature of the battery cell and reducing the first temperature difference.

[0086] During the process from the second preset time to the third preset time, if the first temperature difference decreases to the first preset range, the first wind guide angle is reduced to the first angle. At this time, the heat generation and heat dissipation of the first battery cell return to balance, the current temperature of the battery cell is stable, and the first temperature difference is maintained within the first preset range.

[0087] Therefore, without adjusting the overall heat dissipation condition of the battery pack 13, the temperature adjustment module 14 dynamically regulates the heat dissipation condition of the first battery cell, so that the first temperature difference of the first battery cell is within the first preset range, and the temperature consistency between each battery cell 131 is improved.

[0088] In some embodiments, after the first temperature difference is within the first preset range at the first preset time, the first wind guide angle corresponding to the first battery cell is maintained at the first angle, and the ventilation device 11 is maintained at the first wind speed, the temperature adjustment module 14 is further configured to:

[0089] If the second temperature difference exceeds the second preset range during a process from the first preset time to a second preset time, the first air guide angle is increased from the first angle to a second angle to increase the ventilation area, and the ventilation device 11 corresponding to the first battery pack is increased from the first wind speed to a second wind speed.

[0090] At this time, the in-pack environment temperature in the first battery pack is greater than the preset working temperature of the battery cell, and by increasing the ventilation area of the battery cell 131 and increasing the wind speed of the ventilation device 11, the heat dissipation speed of each battery cell 131 in the first battery pack can be improved, thereby reducing the current temperature of each battery cell 131, reducing the in-pack environment temperature of the first battery pack, and reducing the second temperature difference and the first temperature difference.

[0091] If the first temperature difference decreases to the first preset range during a process from the second preset time to a third preset time, the first air guide angle is decreased to the first angle, and the ventilation device 11 is decreased from the second wind speed to the first wind speed. At this time, the first temperature difference decreases to the first preset range, and the second temperature difference also decreases to the first preset range, so that the in-pack environment temperature in the first battery pack and the current temperature of each battery cell are close to the preset working temperature of the battery cell.

[0092] Therefore, the temperature adjusting module 14 adjusts the overall heat dissipation condition in the battery pack 13 by adjusting the wind speed of the ventilation device 11, and adjusts the current temperature of each battery cell in the battery pack 13 by adjusting the first air guide angle, so that the actual in-pack temperature of the battery pack 13 and the current temperature of each battery cell 13 can be adjusted synchronously, and the adjustment speed of the actual in-pack temperature of the battery pack 13 and the current temperature of each battery cell 13 can be improved.

[0093] In some embodiments, after the first temperature difference is in the first preset range at the first preset time, the first air guide angle corresponding to the first battery cell remains at the first angle, and the ventilation device 11 corresponding to the first battery pack remains at the first wind speed, the temperature adjusting module 14 is further configured to:

[0094] If the first temperature difference exceeds the third preset range and the second temperature difference is in the second preset range during a process from the first preset time to a second preset time, the first air guide angle is increased from the first angle to a second angle, and the second air guide angle of the second air guide structure corresponding to the second battery cell adjacent to the first battery cell is increased to a third angle to increase the ventilation area. The third angle is less than or equal to the second angle.

[0095] Thus, by adjusting the second air guide angle of the second air guide structure corresponding to the second battery cell adjacent to the first battery cell to increase to the third angle to increase the ventilation area, the heat dissipation condition of the second battery cell can be improved, the current temperature of the second battery cell can be synchronized with the current temperature of the first battery cell to reduce, the current temperature of the first battery cell and the current temperature of the second battery cell are improved, and the temperature consistency of the first battery cell and the second battery cell is improved.

[0096] In some embodiments, the temperature collection module 13 is further configured to determine the number of target first battery cells in the first battery pack whose first temperature difference exceeds the first preset range.

[0097] During the process from the first preset time to the second preset time, if the number of target first battery cells is greater than the preset threshold, the first air guide angle corresponding to each target first battery cell is increased from the first angle to the second angle to increase the ventilation area, and the ventilation device 11 corresponding to the first battery pack is increased from the first air speed to the second air speed.

[0098] It can be understood that when the number of target first battery cells is greater than the preset threshold, the current temperature of the first battery cell is adjusted by adjusting the first air guide angle, and the current temperature adjustment speed of the first battery cell is slow.

[0099] Thus, by simultaneously increasing the air speed of the ventilation device 11 and increasing the ventilation area of the target first battery cell, the heat dissipation condition of the entire battery pack 13 and the target first battery cell can be improved simultaneously, and the current temperature control speed of the target first battery cell is improved.

[0100] As shown in the first battery cell temperature control method of the present application, the first battery cell temperature control method comprises the following steps: Figure 5 As shown in the first battery cell temperature control method of the present application, the first battery cell temperature control method comprises the following steps:

[0101] The energy storage device 200 of the present application can make the temperature distribution between the battery packs 13 in the energy storage device 200 more uniform, and the temperature distribution between the battery cells 131 in the battery pack 13 is also more uniform, and the in-pack environment temperature of each battery pack 13 is controlled in the safe temperature range, which can improve the temperature consistency and working safety of the entire energy storage device 200.

[0102] According to the computer readable storage medium of the present application, the computer readable storage medium stores a computer program, the computer program includes program instructions, and the program instructions make the processor execute the temperature control method of the above-mentioned embodiments when the processor executes the program instructions.

[0103] The computer readable storage medium of the present application, by executing the temperature control method of the above embodiment, realizes the adjustment of the actual temperature in the battery pack 13 and the current temperature of each battery cell 131, improves the temperature consistency of each battery cell 131 in the battery pack 13 while controlling the overall temperature of the battery pack 13 to be in a safe range.

[0104] The temperature control method, the temperature control system 100 and the energy storage device 200 according to the embodiments of the present application are known to those skilled in the art, and will not be described in detail here.

[0105] In the description of the present specification, the description referring to the terms "embodiment", "example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0106] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A temperature control method characterized by, The application is applied to an energy storage device (200), the energy storage device (200) comprises at least one battery pack (13), each battery pack (13) comprises a plurality of battery cells (131), at least one ventilation device (11) is arranged on each battery pack (13), each battery cell (131) in each battery pack (13) is correspondingly provided with a wind guide structure (12), the wind guide angle (a) of each wind guide structure (12) can be independently adjusted to adjust the ventilation area towards each battery cell (131), the plurality of battery packs (13) comprises a first battery pack, and the plurality of battery cells (131) in the first battery pack comprise first battery cells; The temperature control method comprises: Real-time collection of the in-pack environment temperature of each battery pack and the current temperature of each battery cell (131) in each battery pack (13); Determination of a first temperature difference between the current temperature of each battery cell (131) and a preset working temperature; Determination of a second temperature difference between the in-pack environment temperature and the preset working temperature of the battery cell; Adjustment of at least one of the wind guide angle (a) of each wind guide structure (12) and the operating state of the ventilation device (11) according to the first temperature difference and the second temperature difference, comprising: When the first temperature difference is within a first preset range at a first preset time, the first wind guide angle of the first wind guide structure corresponding to the first battery cell is kept at a first angle, and the ventilation device (11) corresponding to the first battery pack is kept at a first wind speed; If the first temperature difference exceeds the first preset range and the second temperature difference is within a second preset range during a process from the first preset time to a second preset time, the first wind guide angle corresponding to the first battery cell is increased from the first angle to a second angle to increase the ventilation area; at least one boundary value of the first preset range is greater than a boundary value of the second preset range; If the first temperature difference drops to the first preset range during a process from the second preset time to a third preset time, the first wind guide angle is reduced to the first angle.

2. The temperature control method according to claim 1, characterized by, After the first temperature difference is within the first preset range at the first preset time, the first wind guide angle corresponding to the first battery cell is kept at the first angle, and the ventilation device (11) is kept at the first wind speed, the method further comprises: If the second temperature difference exceeds the second preset range during a process from the first preset time to the second preset time, the first wind guide angle is increased from the first angle to the second angle to increase the ventilation area, and the ventilation device (11) corresponding to the first battery pack is increased from the first wind speed to a second wind speed; If the first temperature difference drops to the first preset range during a process from the second preset time to the third preset time, the first wind guide angle is reduced to the first angle, and the ventilation device (11) is reduced from the second wind speed to the first wind speed.

3. The temperature control method according to claim 1, characterized by, When the first temperature difference is within the first preset range at the first preset time, the first air guide angle corresponding to the first battery cell is kept at the first angle, and the ventilation device (11) corresponding to the first battery pack keeps the first wind speed, the method further comprises: During the process from the first preset time to the second preset time, if the first temperature difference exceeds a third preset range and the second temperature difference is within the second preset range, the first air guide angle is increased from the first angle to the second angle, and a second air guide angle of a second air guide structure corresponding to a second battery cell adjacent to the first battery cell is increased to a third angle to increase the ventilation area; Wherein, the third angle is less than or equal to the second angle.

4. The temperature control method of claim 1, wherein The method further comprises: Determining the number of target first battery cells in the first battery pack, the first temperature difference of which exceeds the first preset range; During the process from the first preset time to the second preset time, if the number of target first battery cells is greater than a preset threshold, the first air guide angle corresponding to each target first battery cell is increased from the first angle to the second angle to increase the ventilation area, and the ventilation device (11) corresponding to the first battery pack is increased from the first wind speed to the second wind speed.

5. The temperature control method of claim 1, wherein The ventilation device (11) is an air exhaust device.

6. The temperature control method according to claim 5, wherein The plurality of battery cells (131) are arranged side by side and spaced apart along the length direction of the battery pack (13) in the battery pack (13), and a ventilation air duct along the width direction of the battery pack (13) is formed between two adjacent battery cells (131). The two side walls of the battery pack (13) along the width direction are respectively provided with ventilation holes corresponding to the ventilation air duct.

7. The temperature control method according to claim 6, wherein The air guide structure (12) is arranged on the two side walls of the battery pack (13) along the width direction corresponding to the two ends of the ventilation passage, and is used for guiding the airflow passing through the ventilation hole to the battery cell (131).

8. A temperature control system characterized by, Applied to an energy storage device (200), the energy storage device (200) comprises at least one battery pack (13), each battery pack (13) comprising a plurality of battery cells (131), and each battery pack (13) is provided with at least one ventilation device (11). Each battery cell (131) in each battery pack (13) is provided with an air guide structure (12), and the air guide angle (α) of each air guide structure (12) can be independently adjusted to adjust the ventilation area towards each battery cell (131); The temperature control system (100) comprises: A temperature acquisition module (14) for acquiring the current temperature of each battery cell (131) and the in-pack environment temperature of the battery pack (13) in real time; A temperature calculation module (15) for calculating the first temperature difference between the current temperature of each battery cell (131) and the preset working temperature, and the second temperature difference between the in-pack environment temperature and the preset working temperature of the battery cell; The temperature adjusting module (16) is configured to adjust at least one of a wind guide angle (a) of each of the wind guide structures (12) and an operating state of the ventilation device (11) according to the first temperature difference and the second temperature difference. The plurality of battery packs (13) includes a first battery pack, and the plurality of battery cells (131) in the first battery pack includes a first battery cell. The temperature adjusting module (16) is configured to adjust at least one of a wind guide angle (a) of each of the wind guide structures (12) and an operating state of the ventilation device (11) according to the first temperature difference and the second temperature difference. When the first temperature difference is within a first preset range at a first preset time, a first wind guide angle of a first wind guide structure corresponding to the first battery cell is maintained at a first angle, and the ventilation device (11) corresponding to the first battery pack is maintained at a first wind speed. During a process from the first preset time to a second preset time, if the first temperature difference exceeds the first preset range and the second temperature difference is within a second preset range, the first wind guide angle corresponding to the first battery cell is increased from the first angle to a second angle to increase the ventilation area; at least one boundary value of the first preset range is greater than a boundary value of the second preset range. During a process from the second preset time to a third preset time, if the first temperature difference decreases to the first preset range, the first wind guide angle is decreased to recover to the first angle.

9. An energy storage device, characterized by, The computer readable storage medium stores a computer program, and the computer program includes program instructions. The program instructions, when executed by a processor, cause the processor to execute the temperature control method according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program includes program instructions. The program instructions, when executed by a processor, cause the processor to execute the temperature control method according to any one of claims 1-7.

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