Battery temperature difference intelligent adjusting method, system and device of distributed energy storage system

Abstract

The invention provides a battery temperature difference intelligent adjusting method, system and device of a distributed energy storage system. The method comprises the steps that the corresponding relation between a battery box and an air duct air outlet is determined; collecting the temperature of the battery cells in each battery box, and calculating the average temperature of the battery cells in each battery box; calculating the average temperature of the whole battery cell of the distributed energy storage system; according to the battery cell average temperature of each battery box and the overall battery cell average temperature of the distributed energy storage system, the average temperature error of each battery box is determined; based on each battery box uniform temperature error, determining an air outlet area control adjustment coefficient of a corresponding air duct air outlet; and adjusting the air duct air outlet according to the air outlet area control adjustment coefficient. Intelligent adjustment of the temperature difference of the batteries in the distributed energy storage system is achieved by controlling the air outlet volume of the air outlets of the air conditioners at different positions in the distributed energy storage system.

Description

Technical Field

[0001] The present invention relates to the field of distributed energy storage technology, and more specifically to a method, system and device for intelligently adjusting battery temperature difference in a distributed energy storage system. Background Art

[0002] At present, the energy storage industry is developing rapidly, and energy storage systems play a positive role in balancing the supply and demand of the power grid, improving the utilization rate of renewable energy, providing peak load regulation, improving the responsiveness of the power system, and improving the stability of the power system. Among all energy storage devices, distributed energy storage systems are widely used in industrial and commercial energy storage, substation energy storage, new energy consumption and other application scenarios due to their flexible application methods.

[0003] Distributed energy storage mainly has two heat dissipation methods: air cooling and liquid cooling. Air cooling uses air flow to remove heat and reduce battery temperature, while liquid cooling mainly collects battery heat through cold plates and then circulates coolant to export the heat out of the battery compartment. Air cooling has the advantages of simple structure, light weight, effective ventilation when harmful gases are generated, low manufacturing cost, easy installation, and easy maintenance. It is widely used in distributed energy storage systems, but it also has disadvantages such as low heat dissipation efficiency, the need for a larger heat dissipation channel, and unstable temperature uniformity.

[0004] Since the distributed energy storage system is small in size and has limited internal space, using air cooling will cause large temperature differences between different internal air locations, resulting in large temperature differences in the batteries, which will affect battery performance and cause problems such as battery imbalance and capacity reduction. Summary of the invention

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide a method, system and device for intelligently adjusting the battery temperature difference of a distributed energy storage system, which realizes intelligent adjustment of the battery temperature difference inside the distributed energy storage system by controlling the air volume of air-conditioning outlets at different positions inside the distributed energy storage system.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] A method for intelligently adjusting battery temperature difference in a distributed energy storage system, wherein the air inlet of each battery box in the distributed energy storage system is provided with an independent air duct, the air inlet of the battery box is connected to the air outlet of the air conditioner through the air duct, and the air outlet of the air duct has an air volume adjustment function. The method comprises:

[0008] Determine the correspondence between the battery box and the air duct outlet;

[0009] Collect the temperature of the battery cells in each battery box and calculate the average temperature of the battery cells in each battery box;

[0010] Calculate the overall average temperature of the distributed energy storage system;

[0011] Determine the average temperature error of each battery box based on the average temperature of the battery cells in each battery box and the average temperature of the overall battery cells in the distributed energy storage system;

[0012] Based on the average temperature error of each battery box, the air outlet area control adjustment coefficient of the corresponding air duct outlet is determined; and the air duct outlet is adjusted according to the air outlet area control adjustment coefficient.

[0013] Furthermore, the distributed energy storage is provided with n battery boxes, and each battery box is provided with m battery cells.

[0014] Further, collecting the temperature of the battery cells in each battery box and calculating the average temperature of the battery cells in each battery box includes:

[0015] The average cell temperature of the ith battery box is calculated according to the following formula:

[0016]

[0017] Among them, T i_ARV is the average temperature of the cells in the ith battery box, T i_m is the temperature of the mth battery cell in the ith battery box, 1≤i≤n.

[0018] Furthermore, the overall average temperature of the battery cells of the distributed energy storage system is calculated according to the following formula:

[0019]

[0020] Among them, T AR V is the overall average temperature of the battery cells in the distributed energy storage system.

[0021] Further, determining the average temperature error of each battery box according to the average temperature of the battery cells of each battery box and the average temperature of the entire battery cells of the distributed energy storage system includes:

[0022] Calculate the average temperature error T of the i-th battery box according to the following formula: i_D :

[0023] T i_D =T ARV -T i_ARV .

[0024] Further, the air outlet area control adjustment coefficient of the corresponding air duct outlet is determined based on the average temperature error of each battery box, including:

[0025] The air outlet area control adjustment coefficient of the i-th air duct outlet is calculated according to the following formula:

[0026]

[0027] Among them, M i_pid is the air outlet area control adjustment coefficient of the i-th air duct outlet, K p is the proportionality coefficient, K i is the integration coefficient, K d is the difference coefficient.

[0028] Further, the air outlet of the air duct is adjusted according to the air outlet area control adjustment coefficient, including:

[0029] Determine the air outlet area control adjustment coefficient M of the i-th air duct outlet i_pid The positive and negative value of

[0030] When M i_pid When it is a positive value, the outlet area of ​​the i-th air duct outlet is increased by a preset area;

[0031] When M i_pid When it is a negative value, the air outlet area of ​​the i-th air duct outlet is reduced by the preset area.

[0032] Correspondingly, the present invention also discloses a battery temperature difference intelligent adjustment system for a distributed energy storage system, comprising:

[0033] A corresponding relationship identification module, used to determine the corresponding relationship between the battery box and the air outlet of the air duct;

[0034] The temperature collection and calculation module is used to collect the temperature of the battery cells in each battery box and calculate the average temperature of the battery cells in each battery box;

[0035] The overall mean value calculation module is used to calculate the overall average temperature of the battery cells of the distributed energy storage system;

[0036] A mean error calculation module is used to determine the average temperature error of each battery box according to the average temperature of the battery cells in each battery box and the average temperature of the overall battery cells of the distributed energy storage system;

[0037] An adjustment coefficient calculation module, used to determine the air outlet area control adjustment coefficient of the corresponding air duct outlet based on the average temperature error of each battery box;

[0038] The air outlet adjustment module is used to adjust the air outlet of the air duct according to the air outlet area control adjustment coefficient.

[0039] Correspondingly, the present invention also discloses a battery temperature difference intelligent adjustment device for a distributed energy storage system, comprising:

[0040] Memory for storing computer programs;

[0041] A processor is used to implement the steps of the method for intelligently adjusting the battery temperature difference of the distributed energy storage system as described in any one of the above items when executing the computer program.

[0042] Compared with the prior art, the beneficial effect of the present invention is that: the present invention provides a method, system and device for intelligently adjusting the battery temperature difference of a distributed energy storage system, which independently controls the air volume of the air inlet duct of each battery box, dynamically adjusts the air outlet area of ​​the air duct outlet based on real-time monitoring of the battery cell temperature and calculation of the average temperature error, thereby achieving precise regulation and balance of the battery cell temperature in the battery box, effectively avoiding local overheating, improving the overall operating efficiency and safety of the energy storage system, and extending the service life of the battery.

[0043] By adjusting the air outlet area of ​​the air conditioner, the present invention can achieve uniform and effective dynamic distribution of the cooling capacity of the air conditioner, offset the influence of the external environment on the temperature difference of the internal space of the distributed energy storage, achieve uniform distribution of the temperature of the internal space of the distributed energy storage, improve the utilization rate of the air conditioner, reduce the temperature difference of the battery cells at different positions, and improve the efficiency and reliability of the distributed energy storage system.

[0044] It can be seen that compared with the prior art, the present invention has outstanding substantive features and significant progress, and the beneficial effects of its implementation are also obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0046] Figure 1 It is a method flow chart of a specific implementation mode of the present invention.

[0047] Figure 2 It is a distribution diagram of a battery box and air duct according to a specific embodiment of the present invention.

[0048] Figure 3 It is a system structure diagram of a specific implementation mode of the present invention.

[0049] In the figure, 1. Correspondence recognition module; 2. Temperature collection and calculation module; 3. Overall mean calculation module; 4. Mean error calculation module; 5. Adjustment coefficient calculation module; 6. Air outlet adjustment module. DETAILED DESCRIPTION

[0050] The specific implementation of the present invention is described below with reference to the accompanying drawings.

[0051] The present invention discloses a method for intelligently regulating battery temperature difference in a distributed energy storage system. In the distributed energy storage system, an air inlet of each battery box is provided with an independent air duct, the air inlet of the battery box is connected with an air outlet of an air conditioner through the air duct, and the air outlet of the air duct has an air volume regulating function.

[0052] like Figure 1 As shown, the battery temperature difference intelligent adjustment method of the distributed energy storage system includes the following steps:

[0053] S1: Determine the correspondence between the battery box and the air duct outlet.

[0054] In a specific embodiment, Figure 2 As shown, there are n battery boxes in the distributed energy storage, and accordingly, each battery box corresponds to an air outlet, and each battery box and the corresponding air outlet are uniformly numbered. That is, the air outlet corresponding to battery box i is air outlet i, 1≤i≤n. In addition, each battery box is provided with m battery cells.

[0055] S2: Collect the temperature of the battery cells in each battery box and calculate the average temperature of the battery cells in each battery box.

[0056] In a specific implementation, the average temperature of the cells in the ith battery box is calculated according to the following formula:

[0057]

[0058] Among them, T i_ARV is the average temperature of the cells in the ith battery box, T i_m is the temperature of the mth battery cell in the ith battery box, 1≤i≤n.

[0059] S3: Calculate the overall average temperature of the battery cells of the distributed energy storage system.

[0060] In a specific implementation, the overall average temperature of the cells in the distributed energy storage system is calculated according to the following formula:

[0061]

[0062] Among them, T ARV is the average temperature of the entire battery cell of the distributed energy storage system.

[0063] S4: Determine the average temperature error of each battery box according to the average temperature of the battery cells in each battery box and the overall average temperature of the battery cells of the distributed energy storage system.

[0064] In a specific implementation, the average temperature error T of the ith battery box is calculated according to the following formula: i_D :

[0065] T i_D =T ARV-T i_ARV .

[0066] S5: Based on the average temperature error of each battery box, determine the air outlet area control adjustment coefficient of the corresponding air duct outlet.

[0067] In a specific implementation, the air outlet area control adjustment coefficient of the i-th air duct outlet is calculated according to the following formula:

[0068]

[0069] Among them, M i_pid is the air outlet area control adjustment coefficient of the i-th air duct outlet, K p is the proportionality coefficient, K i is the integration coefficient, K d is the difference coefficient.

[0070] S6: Adjust the air outlet of the air duct according to the air outlet area control adjustment coefficient.

[0071] In a specific implementation, first determine the air outlet area control adjustment coefficient M of the i-th air duct outlet i_pid The positive and negative value of M i_pid When M is positive, the outlet area of ​​the i-th air duct outlet is increased by the preset area; i_pid When it is a negative value, the air outlet area of ​​the i-th air duct outlet is reduced by the preset area.

[0072] As an example, calculate M i_pid After that, the distributed energy storage system is based on M i_pid Adjust the size of the air outlet i area, when M i_pid M n_pid When it is negative, the distributed energy storage master sends a command to drive the stepper motor at the air outlet of the air conditioning duct to rotate forward M i_pid×k The angle drives the ball screw to move the air outlet leaf to reduce the air outlet area. i_pid When the distributed energy storage master sends a command, the stepper motor at the air outlet of the air conditioner duct is reversed M i_pid×k The angle drives the ball screw to move the air outlet blades to increase the air outlet area.

[0073] Correspondingly, such as Figure 3 As shown, the present invention also discloses a battery temperature difference intelligent adjustment system for a distributed energy storage system, comprising:

[0074] The corresponding relationship identification module 1 is used to determine the corresponding relationship between the battery box and the air outlet of the air duct.

[0075] The temperature collection and calculation module 2 is used to collect the temperature of the battery cells in each battery box and calculate the average temperature of the battery cells in each battery box.

[0076] The overall mean value calculation module 3 is used to calculate the overall average temperature of the battery cells of the distributed energy storage system.

[0077] The mean error calculation module 4 is used to determine the average temperature error of each battery box according to the average temperature of the battery cells in each battery box and the overall average temperature of the battery cells of the distributed energy storage system.

[0078] The adjustment coefficient calculation module 5 is used to determine the air outlet area control adjustment coefficient of the corresponding air duct outlet based on the average temperature error of each battery box.

[0079] The air outlet adjustment module 6 is used to adjust the air outlet of the air duct according to the air outlet area control adjustment coefficient.

[0080] The specific implementation of the battery temperature difference intelligent adjustment system of the distributed energy storage system of this embodiment is basically the same as the specific implementation of the battery temperature difference intelligent adjustment method of the distributed energy storage system mentioned above, and will not be repeated here.

[0081] Correspondingly, the present invention also discloses a battery temperature difference intelligent adjustment device for a distributed energy storage system, comprising:

[0082] Memory for storing computer programs;

[0083] A processor is used to implement the steps of the method for intelligently adjusting the battery temperature difference of the distributed energy storage system as described in any one of the above items when executing the computer program.

[0084] Those skilled in the art can clearly understand that the technology in the embodiment of the present invention can be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution in the embodiment of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product is stored in a storage medium such as a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a disk or an optical disk, etc. Various media that can store program codes include several instructions to enable a computer terminal (which can be a personal computer, a server, or a second terminal, a network terminal, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The same and similar parts between the various embodiments in this specification can be referred to each other. In particular, for the terminal embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description in the method embodiment.

[0085] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, systems and methods can be implemented in other ways. For example, the system embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of systems or units, which can be electrical, mechanical or other forms.

[0086] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0087] In addition, each functional module in each embodiment of the present invention may be integrated into one processing unit, or each module may exist physically separately, or two or more modules may be integrated into one unit.

[0088] Similarly, each processing unit in each embodiment of the present invention may be integrated into one functional module, or each processing unit may exist physically, or two or more processing units may be integrated into one functional module.

[0089] The present invention will be further described with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope limited by the application.

Claims

1. A method for intelligently adjusting battery temperature difference in a distributed energy storage system, wherein in the distributed energy storage, the air inlet of each battery box is provided with an independent air duct, the air inlet of the battery box is connected to the air outlet of the air conditioner through the air duct, and the air outlet of the air duct has an air volume adjustment function, characterized in that: The method comprises: Determine the correspondence between the battery box and the air duct outlet; Collect the temperature of the battery cells in each battery box and calculate the average temperature of the battery cells in each battery box; Calculate the overall average temperature of the distributed energy storage system; Determine the average temperature error of each battery box based on the average temperature of the battery cells in each battery box and the average temperature of the overall battery cells in the distributed energy storage system; Based on the average temperature error of each battery box, the air outlet area control adjustment coefficient of the corresponding air duct outlet is determined; and the air duct outlet is adjusted according to the air outlet area control adjustment coefficient.

2. The method for intelligently adjusting battery temperature difference of a distributed energy storage system according to claim 1, characterized in that: The distributed energy storage is provided with n battery boxes, each of which is provided with m battery cells.

3. The method for intelligently adjusting battery temperature difference of a distributed energy storage system according to claim 2, characterized in that: The collecting the temperature of the battery cells in each battery box and calculating the average temperature of the battery cells in each battery box includes: The average cell temperature of the ith battery box is calculated according to the following formula: Among them, T i_ARV is the average temperature of the cells in the ith battery box, T i_m is the temperature of the mth battery cell in the ith battery box, 1≤i≤n.

4. The method for intelligently adjusting battery temperature difference of a distributed energy storage system according to claim 3 is characterized in that: The overall average temperature of the distributed energy storage system is calculated according to the following formula: Among them, T AR V is the overall average temperature of the battery cells in the distributed energy storage system.

5. The method for intelligently adjusting battery temperature difference of a distributed energy storage system according to claim 4 is characterized in that: The step of determining the average temperature error of each battery box according to the average temperature of the battery cells of each battery box and the average temperature of the entire battery cells of the distributed energy storage system includes: Calculate the average temperature error T of the i-th battery box according to the following formula: i_D： T i_D =T ARV -T i_AR V。 6. The method for intelligently adjusting battery temperature difference of a distributed energy storage system according to claim 5, characterized in that: The method of determining the air outlet area control adjustment coefficient of the corresponding air duct outlet based on the average temperature error of each battery box includes: The air outlet area control adjustment coefficient of the i-th air duct outlet is calculated according to the following formula: Among them, M i_pid is the air outlet area control adjustment coefficient of the i-th air duct outlet, K p is the proportionality coefficient, K i is the integration coefficient, K d is the difference coefficient.

7. The method for intelligently adjusting battery temperature difference of a distributed energy storage system according to claim 6, characterized in that: The method of adjusting the air outlet of the air duct according to the air outlet area control adjustment coefficient includes: Determine the air outlet area control adjustment coefficient M of the i-th air duct outlet i_pid The positive and negative value of When M i_pid When it is a positive value, the outlet area of ​​the i-th air duct outlet is increased by a preset area; When M i_pid When it is a negative value, the air outlet area of ​​the i-th air duct outlet is reduced by the preset area.

8. A battery temperature difference intelligent adjustment system for a distributed energy storage system, characterized in that: include: A corresponding relationship identification module, used to determine the corresponding relationship between the battery box and the air outlet of the air duct; The temperature collection and calculation module is used to collect the temperature of the battery cells in each battery box and calculate the average temperature of the battery cells in each battery box; The overall mean value calculation module is used to calculate the overall average temperature of the battery cells of the distributed energy storage system; A mean error calculation module is used to determine the average temperature error of each battery box according to the average temperature of the battery cells in each battery box and the average temperature of the overall battery cells of the distributed energy storage system; An adjustment coefficient calculation module, used to determine the air outlet area control adjustment coefficient of the corresponding air duct outlet based on the average temperature error of each battery box; The air outlet adjustment module is used to adjust the air outlet of the air duct according to the air outlet area control adjustment coefficient.

9. A battery temperature difference intelligent adjustment device for a distributed energy storage system, characterized in that: include: Memory for storing computer programs; A processor is used to implement the steps of the method for intelligently adjusting battery temperature difference in distributed energy storage as claimed in any one of claims 1 to 7 when executing the computer program.

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