Battery cell temperature control method, system and device of energy storage system and medium

Abstract

The invention provides a battery cell temperature control method, system and device of an energy storage system and a medium. The method comprises the steps that the temperature value of each battery cluster and the flow value of cooling liquid in a cold plate on the corresponding side are obtained in real time; analyzing and comparing the temperature value of each battery cluster to determine the battery cluster with abnormal temperature; determining an abnormal type and an adjustment coefficient according to the temperature value of the battery cluster with the abnormal temperature; and generating a corresponding control command according to the abnormal type and the adjustment coefficient, and controlling the opening degree of a secondary flow valve in the cold plate on the corresponding side so as to adjust the temperature of the battery cluster. The heat dissipation efficiency and safety of the battery can be improved, and the service life of the battery is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and more specifically to a method, system, device and medium for controlling the temperature of a battery cell of an energy storage system. Background Art

[0002] Energy storage technology refers to the technology of storing energy so that it can be released and used when needed. Among them, energy storage system is a common energy storage technology, which stores electrical energy by converting it into other forms of energy so that it can be released and used when needed.

[0003] In energy storage systems, batteries are the main energy storage devices. Since batteries generate a lot of heat during operation, if the heat cannot be dissipated in a timely and effective manner, the battery temperature will be too high, thus affecting the performance and life of the battery. If the heat dissipation is uneven, the charge and discharge capacity between the cells will be inconsistent. After repeated use, uneven charging will occur. In the long run, some cells may be overcharged and thermal runaway may occur.

[0004] In order to ensure the normal operating temperature of the battery and improve the battery life and safety, liquid cooling technology is widely used in battery packs. The most commonly used liquid cooling method for battery packs on the market is bottom cooling. In the bottom cooling solution, the coolant flows from the bottom of the battery cell and reduces the temperature of the battery cell by absorbing heat and flowing. However, due to the thermal resistance of the battery cell itself, the bottom cooling solution will cause a large temperature difference between the top and bottom of the battery cell.

[0005] There are three main problems at present:

[0006] 1. Excessive temperature difference will lead to uneven heat distribution in the battery cell, causing the temperature in some areas of the battery cell to be too high, increasing the risk of thermal runaway of the battery cell. Due to the thermal resistance of the battery cell itself, the coolant in the bottom cooling solution mainly flows through the bottom of the battery cell, absorbs heat and then flows to other parts to reduce the temperature of the battery cell. However, due to the temperature difference between the top and bottom of the battery cell, the heat distribution of the battery cell is uneven. Excessive temperature in some areas may cause thermal runaway of the battery cell, resulting in the risk of battery failure or even fire and explosion.

[0007] 2. Excessive temperature difference will affect the heat dissipation effect of the battery pack, reduce the heat dissipation efficiency of the entire battery pack, and further affect the performance and life of the battery. In the bottom cooling solution, the coolant flows through the bottom of the battery cell, absorbs heat and then flows out. However, due to the temperature difference between the top and bottom of the battery cell, the heat dissipation effect of the battery cell is limited. Excessive temperature difference will cause the heat at the top of the battery cell to be unable to be effectively transferred to the coolant, thereby reducing the heat dissipation efficiency of the entire battery pack. Over a long period of time, excessively high temperatures will accelerate battery aging, shorten battery life, and may cause performance degradation.

[0008] 3. Excessive temperature difference will also cause uneven thermal expansion of the battery cells, increase the mechanical stress between the battery cells and other components, and may cause damage or failure of the battery pack. Excessive temperature difference will cause uneven thermal expansion of the battery cells, that is, the expansion degree of the top and bottom of the battery cells is inconsistent. In this case, the mechanical stress between the battery cells and other components will increase, which may cause damage or failure of the battery pack. For example, the adhesive layer between the battery cell and the packaging material may be subjected to excessive stress, resulting in peeling or breaking of the adhesive layer. This mechanical stress may also cause damage inside the battery cell, thereby affecting the normal operation of the battery. Summary of the invention

[0009] In view of the above problems, an object of the present invention is to provide a method, system, device and medium for controlling the temperature of a battery cell of an energy storage system, which can improve the heat dissipation efficiency and safety of the battery and extend the service life of the battery.

[0010] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0011] In a first aspect, the present invention discloses a method for controlling the temperature of a battery cell of an energy storage system, wherein a bottom cold plate and a side cold plate are provided in the energy storage system, wherein the side cold plate is provided on the side of each battery cluster in the energy storage system, and wherein a secondary flow valve for controlling the flow of coolant is provided in the side cold plate.

[0012] The method comprises:

[0013] Obtain the temperature value of each battery cluster and the flow value of the coolant in the corresponding side cold plate in real time;

[0014] Analyze and compare the temperature values ​​of each battery cluster to identify the battery cluster with abnormal temperature;

[0015] Determine the abnormality type and adjustment coefficient according to the temperature value of the battery cluster with abnormal temperature;

[0016] The corresponding control command is generated according to the abnormality type and the adjustment coefficient to control the opening and closing degree of the secondary flow valve in the corresponding side cold plate to adjust the temperature of the battery cluster.

[0017] Furthermore, the real-time acquisition of the temperature value of each battery cluster and the flow value of the coolant in the corresponding side cold plate includes:

[0018] The sensing value of the preset temperature sensing probe in each battery cluster is read in real time to obtain the temperature value of each battery cluster; the sensing value of the preset flow monitoring probe in each side cold plate is read in real time to obtain the flow value of each side cold plate.

[0019] Further, the analyzing and comparing the temperature values ​​of each battery cluster to determine the battery cluster with abnormal temperature includes:

[0020] Sort the temperature values ​​of each battery cluster in ascending order to determine the minimum temperature value and the maximum temperature value;

[0021] Determine the temperature difference of the current energy storage system according to the difference between the maximum temperature value and the minimum temperature value;

[0022] Determine whether the temperature difference value is less than or equal to a temperature difference threshold;

[0023] If yes, the current temperature control of the energy storage system is normal, and there is no battery cluster with abnormal temperature in the energy storage system.

[0024] Furthermore, the step of analyzing and comparing the temperature values ​​of each battery cluster to determine the battery cluster with abnormal temperature further includes:

[0025] If the temperature difference is greater than the temperature difference threshold, the average temperature of the current energy storage system is calculated according to the temperature value of each battery cluster;

[0026] The temperature difference coefficient X of each battery cluster is calculated by the formula X=|T-Tave| / Tave*100%; where T is the temperature value of any battery cluster, and Tave is the average temperature of the current energy storage system;

[0027] Determine whether the temperature difference coefficient of each battery cluster is less than or equal to the temperature difference coefficient threshold;

[0028] If yes, the current temperature control of the energy storage system is normal, and there is no battery cluster with abnormal temperature in the energy storage system;

[0029] If not, the battery cluster whose temperature difference coefficient is greater than the temperature difference coefficient threshold is marked and regarded as a battery cluster with abnormal temperature.

[0030] Further, the method of determining the abnormality type and the adjustment coefficient according to the temperature value of the battery cluster with abnormal temperature includes:

[0031] The temperature value of the battery cluster with abnormal temperature is recorded as T0, and the corresponding temperature difference coefficient is recorded as X0;

[0032] If T0<Tave, the abnormality type is low temperature abnormality;

[0033] If T0>Tave, the abnormality type is high temperature abnormality.

[0034] Furthermore, the determining of the abnormality type and the adjustment coefficient according to the temperature value of the battery cluster with abnormal temperature also includes:

[0035] Determine the opening / closing degree adjustment coefficient K of the secondary flow valve in the side cold plate corresponding to the battery cluster with abnormal temperature according to X0 and the adjustment coefficient identification interval;

[0036] If 0≤X0<30%, K=15%;

[0037] If 30%≤X0<65%, K=25%;

[0038] If X≥65%0, K=50%.

[0039] Further, the generating of corresponding control commands according to the abnormality type and the adjustment coefficient to control the opening and closing degree of the secondary flow valve in the corresponding side cold plate to adjust the temperature of the battery cluster includes:

[0040] Generate corresponding control commands according to the abnormality type and adjustment coefficient;

[0041] If the abnormality type is low temperature abnormality, the opening and closing degree of the secondary flow valve in the corresponding side cold plate is reduced by K through the control command;

[0042] If the abnormality type is high temperature abnormality, the opening and closing degree of the secondary flow valve in the cold plate on the corresponding side is increased by K through the control command.

[0043] In a second aspect, the present invention further discloses a battery cell temperature control system for an energy storage system, comprising: a measurement module configured to obtain in real time the temperature value of each battery cluster and the flow value of the coolant in the corresponding side cold plate;

[0044] A screening module configured to analyze and compare the temperature value of each battery cluster to determine a battery cluster with abnormal temperature;

[0045] A type identification module configured to determine an abnormality type and an adjustment coefficient of a battery cluster with abnormal temperature according to a temperature value of the battery cluster;

[0046] The control module is configured to generate a corresponding control command according to the abnormality type and the adjustment coefficient, and control the opening and closing degree of the secondary flow valve in the corresponding side cold plate to adjust the temperature of the battery cluster.

[0047] In a third aspect, the present invention further discloses a battery cell temperature control device for an energy storage system, comprising:

[0048] A memory, used to store a cell temperature control program of the energy storage system;

[0049] A processor is used to implement the steps of the battery cell temperature control method of the energy storage system as described in any one of the above items when executing the battery cell temperature control program of the energy storage system.

[0050] In a fourth aspect, the present invention further discloses a readable storage medium, on which is stored a battery cell temperature control program for an energy storage system. When the battery cell temperature control program for the energy storage system is executed by a processor, the steps of the battery cell temperature control method for the energy storage system as described in any of the above items are implemented.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] 1. The present invention realizes the function of real-time monitoring and control of the internal temperature and temperature difference of the battery. Through real-time monitoring of the battery temperature sensor and the flow monitoring probe, the temperature and flow information of each battery cluster can be accurately obtained. Once a large temperature difference is found, corresponding adjustments can be made immediately. Through the action of the secondary pipeline flow control valve, the coolant flow of the battery cluster with high temperature is increased, and the coolant flow of the battery cluster with low temperature is reduced to ensure uniform temperature between battery clusters. This real-time monitoring and control capability helps to improve the safety and stability of the energy storage system and avoid battery aging and damage caused by uneven temperature.

[0053] 2. The present invention has the advantage of rapid response. Once the temperature difference is detected, corresponding adjustments can be made quickly to increase the coolant flow of the battery cluster with high temperature and decrease the coolant flow of the battery cluster with low temperature. This rapid response characteristic can ensure that the energy storage system can quickly adapt to different working conditions, thereby improving the flexibility and applicability of the energy storage system. At the same time, rapid response also helps to reduce the loss of the battery in high or low temperature environments and extend the service life of the battery.

[0054] 3. The present invention can also effectively extend the service life of the battery, improve the energy utilization rate of the energy storage system, and reduce energy waste. By real-time monitoring and controlling the internal temperature and flow of the battery, the working state of the battery can be controlled more accurately, avoiding uneven aging caused by temperature differences, and improving the cycle life and energy utilization rate of the battery. This advantage helps to reduce energy waste, improve energy utilization efficiency, and meet the environmental protection requirements of energy conservation and emission reduction.

[0055] It can be seen that the present invention improves the intelligence level of the energy storage system, enhances the safety and stability of the system by real-time monitoring and controlling the internal temperature and flow of the battery, and has high practical value and economic value. 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

[0056] 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.

[0057] Figure 1 It is a method flow chart of a specific implementation mode of the present invention.

[0058] Figure 2 It is a system structure diagram of a specific implementation mode of the present invention.

[0059] In the figure, 1. measurement module; 2. screening module; 3. type identification module; 4. control module. DETAILED DESCRIPTION

[0060] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0061] The present embodiment provides a method for controlling the temperature of a battery cell of an energy storage system. The method is applied to an energy storage system, and the energy storage system can not only solve the heat dissipation problem of the bottom surface of the battery cell, but also ensure that the temperature of the battery cell is more uniform. Specifically, a bottom cold plate and a side cold plate are provided in the energy storage system. The side cold plate is provided on the side of each battery cluster in the energy storage system. A secondary flow valve for controlling the flow of coolant is provided in the side cold plate. It can be seen that the energy storage system adopts a bottom cooling plus side cooling solution to solve the heat dissipation problem of the bottom surface of the battery cell in the existing side cooling solution, while ensuring that the temperature of the battery cell is more uniform.

[0062] Based on the structural principle of the above energy storage system, see Figure 1 As shown, the battery cell temperature control method of the energy storage system provided in this embodiment specifically includes the following steps:

[0063] S1: Acquire the temperature value of each battery cluster and the flow value of the coolant in the corresponding side cold plate in real time.

[0064] It should be noted that in the energy storage system, each battery cluster is provided with a temperature sensing probe, each side cold plate is provided with a flow monitoring probe, and each side cold plate is provided with a secondary flow valve for controlling the coolant flow.

[0065] Therefore, in this step, the sensing value of the preset temperature sensing probe in each battery cluster is read in real time to obtain the temperature value of each battery cluster; at the same time, the sensing value of the preset flow monitoring probe in each side cold plate is read in real time to obtain the flow value of each side cold plate.

[0066] S2: Analyze and compare the temperature value of each battery cluster to determine the battery cluster with abnormal temperature.

[0067] In a specific implementation manner, this step specifically includes the following sub-steps:

[0068] S21: Sort the temperature values ​​of each battery cluster in ascending order to determine the minimum temperature value and the maximum temperature value.

[0069] S22: Determine the temperature difference of the current energy storage system according to the difference between the maximum temperature value and the minimum temperature value.

[0070] S23: Determine whether the temperature difference is less than or equal to the temperature difference threshold; if so, the current energy storage system temperature control is normal, and there is no battery cluster with abnormal temperature in the energy storage system; if not, execute step S24.

[0071] S24: Calculate the average temperature of the current energy storage system according to the temperature value of each battery cluster.

[0072] Specifically, the temperature difference coefficient X of each battery cluster is calculated by the formula X=|T-Tave| / Tave*100%; wherein T is the temperature value of any battery cluster, and Tave is the average temperature of the current energy storage system.

[0073] S25: Determine whether the temperature difference coefficient of each battery cluster is less than or equal to the temperature difference coefficient threshold; if so, the current energy storage system temperature control is normal, and there is no battery cluster with abnormal temperature in the energy storage system; if not, execute step S26.

[0074] S26: Mark the battery cluster whose temperature difference coefficient is greater than the temperature difference coefficient threshold and regard it as a battery cluster with abnormal temperature.

[0075] S3: Determine the abnormality type and adjustment coefficient according to the temperature value of the battery cluster with abnormal temperature.

[0076] In a specific implementation, first, the temperature value of the battery cluster with temperature abnormality is recorded as T0, and the corresponding temperature difference coefficient is recorded as X0; if T0<Tave, the abnormality type is low temperature abnormality; if T0>Tave, the abnormality type is high temperature abnormality. That is, when the temperature value of the battery cluster with temperature abnormality is greater than the average temperature of the energy storage system, the abnormality type is high temperature abnormality; when the temperature value of the battery cluster with temperature abnormality is less than the average temperature of the energy storage system, the abnormality type is low temperature abnormality.

[0077] Then, the opening and closing adjustment coefficient K of the secondary flow valve in the side cold plate corresponding to the battery cluster with abnormal temperature is determined according to X0 and the adjustment coefficient identification interval. If 0≤X0<30%, K=15%; if 30%≤X0<65%, K=25%; if X≥65%0, K=50%. Among them, the adjustment coefficient identification interval and the opening and closing adjustment coefficient K of the secondary flow valve corresponding to each interval are the interval range and the corresponding adjustment coefficient set after analyzing the prediction results of the preset temperature adjustment neural network model and the corresponding temperature adjustment effect information.

[0078] S4: Generate a corresponding control command according to the abnormality type and the adjustment coefficient, and control the opening and closing degree of the secondary flow valve in the corresponding side cold plate to adjust the temperature of the battery cluster.

[0079] In a specific implementation, a corresponding control command is generated according to the abnormality type and the adjustment coefficient; if the abnormality type is a low temperature abnormality, the opening and closing degree of the secondary flow valve in the corresponding side cold plate is reduced by K through the control command; if the abnormality type is a high temperature abnormality, the opening and closing degree of the secondary flow valve in the corresponding side cold plate is increased by K through the control command.

[0080] As an example, taking X0=45% as an example, the adjustment coefficient K can be determined to be 25% based on the adjustment coefficient identification interval provided in step S3. Assuming that the corresponding T0<Tave, the abnormality type is a low temperature abnormality. At this time, the opening and closing degree of the secondary flow valve in the corresponding side cold plate is reduced by 25% through a control command. If the current opening and closing degree of the secondary flow valve is less than 25%, the secondary flow valve is directly closed. Similarly, assuming that the corresponding T0>Tave, the abnormality type is a high temperature abnormality. The opening and closing degree of the secondary flow valve in the corresponding side cold plate is increased by 25% through a control command. If the current opening and closing degree of the secondary flow valve is already greater than 75%2, the secondary flow valve is directly fully opened.

[0081] It can be seen that the present invention provides a method for controlling the temperature of battery cells in an energy storage system, which realizes the function of real-time monitoring and controlling the temperature and temperature difference inside the battery. Through real-time monitoring of the battery temperature probe and the flow monitoring probe, the temperature and flow information of each battery cluster can be accurately obtained. Once a large temperature difference is found, corresponding adjustments can be made immediately. Through the action of the secondary pipeline flow control valve, the coolant flow of the battery cluster with a high temperature is increased, and the coolant flow of the battery cluster with a low temperature is reduced to ensure uniform temperature between battery clusters. This method helps to improve the safety and stability of the energy storage system, and can avoid battery aging and damage caused by uneven temperature.

[0082] See also Figure 2 As shown, the present invention also discloses a battery cell temperature control system for an energy storage system, comprising: a measurement module 1, a screening module 2, a type identification module 3 and a control module 4.

[0083] The measuring module 1 is configured to obtain the temperature value of each battery cluster and the flow value of the coolant in the corresponding side cold plate in real time.

[0084] The screening module 2 is configured to analyze and compare the temperature value of each battery cluster to determine the battery cluster with abnormal temperature.

[0085] The type identification module 3 is configured to determine the abnormality type and adjustment coefficient of the battery cluster with abnormal temperature according to the temperature value of the battery cluster with abnormal temperature.

[0086] The control module 4 is configured to generate a corresponding control command according to the abnormality type and the adjustment coefficient, and control the opening and closing degree of the secondary flow valve in the corresponding side cold plate to adjust the temperature of the battery cluster.

[0087] The specific implementation of the battery cell temperature control system of the energy storage system of this embodiment is basically the same as the specific implementation of the battery cell temperature control method of the energy storage system described above, and will not be repeated here.

[0088] The present invention also discloses a battery cell temperature control device for an energy storage system, comprising a processor and a memory; wherein, when the processor executes the battery cell temperature control program of the energy storage system stored in the memory, the steps of the battery cell temperature control method of the energy storage system as described in any one of the above items are implemented.

[0089] Furthermore, the battery cell temperature control device of the energy storage system in this embodiment may also include:

[0090] The input interface is used to obtain the battery cell temperature control program of the energy storage system imported from the outside, and save the obtained battery cell temperature control program of the energy storage system to the memory, and can also be used to obtain various instructions and parameters transmitted by external terminal devices, and transmit them to the processor, so that the processor can use the above various instructions and parameters to carry out corresponding processing. In this embodiment, the input interface can specifically include but is not limited to a USB interface, a serial interface, a voice input interface, a fingerprint input interface, a hard disk reading interface, etc.

[0091] The output interface is used to output various data generated by the processor to the terminal device connected thereto, so that other terminal devices connected to the output interface can obtain various data generated by the processor. In this embodiment, the output interface may specifically include but is not limited to a USB interface, a serial interface, etc.

[0092] The communication unit is used to establish a remote communication connection between the battery temperature control device of the energy storage system and the external server, so that the battery temperature control device of the energy storage system can mount the image file to the external server. In this embodiment, the communication unit may specifically include but is not limited to a remote communication unit based on wireless communication technology or wired communication technology.

[0093] The keyboard is used to obtain various parameter data or instructions input by the user by tapping the keycaps in real time.

[0094] The display is used to display the relevant information of the battery cell temperature control process of the energy storage system in real time.

[0095] The mouse can be used to assist users in inputting data and simplify user operations.

[0096] The present invention also discloses a readable storage medium, wherein the readable storage medium includes a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable hard disk, a CD-ROM or any other form of storage medium known in the technical field. The readable storage medium stores a battery cell temperature control program of the energy storage system, and when the battery cell temperature control program of the energy storage system is executed by a processor, the steps of the battery cell temperature control method of the energy storage system described in any one of the above items are implemented.

[0097] In summary, the present invention improves the intelligence level of the energy storage system, enhances the safety and stability of the system by real-time monitoring and controlling the internal temperature and flow of the battery, and has high practical and economic value.

[0098] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. As for the method disclosed in the embodiment, since it corresponds to the system disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0099] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0105] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0106] The above is a detailed introduction to the battery cell temperature control method, system, device and readable storage medium of the energy storage system provided by the present invention. Specific examples are used in this article 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. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A method for controlling the temperature of a battery cell of an energy storage system, characterized in that: The energy storage system is provided with a bottom cold plate and a side cold plate, the side cold plate is provided on the side of each battery cluster in the energy storage system, and the side cold plate is provided with a secondary flow valve for controlling the flow of coolant; The method comprises: Obtain the temperature value of each battery cluster and the flow value of the coolant in the corresponding side cold plate in real time; Analyze and compare the temperature values ​​of each battery cluster to identify the battery cluster with abnormal temperature; Determine the abnormality type and adjustment coefficient according to the temperature value of the battery cluster with abnormal temperature; The corresponding control command is generated according to the abnormality type and the adjustment coefficient to control the opening and closing degree of the secondary flow valve in the corresponding side cold plate to adjust the temperature of the battery cluster.

2. The method for controlling the battery cell temperature of the energy storage system according to claim 1, characterized in that: The real-time acquisition of the temperature value of each battery cluster and the flow value of the coolant in the corresponding side cold plate includes: The sensing value of the preset temperature sensing probe in each battery cluster is read in real time to obtain the temperature value of each battery cluster; the sensing value of the preset flow monitoring probe in each side cold plate is read in real time to obtain the flow value of each side cold plate.

3. The method for controlling the battery cell temperature of the energy storage system according to claim 1, characterized in that: The analyzing and comparing the temperature values ​​of each battery cluster to determine the battery cluster with abnormal temperature includes: Sort the temperature values ​​of each battery cluster in ascending order to determine the minimum temperature value and the maximum temperature value; Determine the temperature difference of the current energy storage system according to the difference between the maximum temperature value and the minimum temperature value; Determine whether the temperature difference value is less than or equal to a temperature difference threshold; If yes, the current temperature control of the energy storage system is normal, and there is no battery cluster with abnormal temperature in the energy storage system.

4. The method for controlling the temperature of a battery cell of an energy storage system according to claim 3, characterized in that: The analyzing and comparing the temperature values ​​of each battery cluster to determine the battery cluster with abnormal temperature also includes: if the temperature difference value is greater than the temperature difference threshold, calculating the average temperature of the current energy storage system according to the temperature value of each battery cluster; The temperature difference coefficient X of each battery cluster is calculated by the formula X=|T-Tave| / Tave*100%; where T is the temperature value of any battery cluster, and Tave is the average temperature of the current energy storage system; Determine whether the temperature difference coefficient of each battery cluster is less than or equal to the temperature difference coefficient threshold; If yes, the current temperature control of the energy storage system is normal, and there is no battery cluster with abnormal temperature in the energy storage system; If not, the battery cluster whose temperature difference coefficient is greater than the temperature difference coefficient threshold is marked and regarded as a battery cluster with abnormal temperature.

5. The method for controlling the battery cell temperature of the energy storage system according to claim 4, characterized in that: The determining of the abnormality type and the adjustment coefficient according to the temperature value of the battery cluster with abnormal temperature includes: The temperature value of the battery cluster with abnormal temperature is recorded as T0, and the corresponding temperature difference coefficient is recorded as X0; If T0<Tave, the abnormality type is low temperature abnormality; If T0>Tave, the abnormality type is high temperature abnormality.

6. The method for controlling the battery cell temperature of the energy storage system according to claim 5, characterized in that: The method of determining the abnormality type and adjustment coefficient according to the temperature value of the battery cluster with abnormal temperature also includes: Determine the opening / closing degree adjustment coefficient K of the secondary flow valve in the side cold plate corresponding to the battery cluster with abnormal temperature according to X0 and the adjustment coefficient identification interval; If 0≤X0<30%, K=15%; If 30%≤X0<65%, K=25%; If X≥65%0, K=50%.

7. The method for controlling the battery cell temperature of the energy storage system according to claim 6, characterized in that: The generating of corresponding control commands according to the abnormality type and the adjustment coefficient, and controlling the opening and closing degree of the secondary flow valve in the corresponding side cold plate to adjust the temperature of the battery cluster includes: Generate corresponding control commands according to the abnormality type and adjustment coefficient; If the abnormality type is low temperature abnormality, the opening and closing degree of the secondary flow valve in the corresponding side cold plate is reduced by K through the control command; If the abnormality type is high temperature abnormality, the opening and closing degree of the secondary flow valve in the cold plate on the corresponding side is increased by K through the control command.

8. A battery cell temperature control system for an energy storage system, characterized in that: include: A measuring module configured to obtain a temperature value of each battery cluster and a flow value of a coolant in a corresponding side cold plate in real time; A screening module configured to analyze and compare the temperature value of each battery cluster to determine a battery cluster with abnormal temperature; A type identification module configured to determine an abnormality type and an adjustment coefficient of a battery cluster with abnormal temperature according to a temperature value of the battery cluster; The control module is configured to generate a corresponding control command according to the abnormality type and the adjustment coefficient, and control the opening and closing degree of the secondary flow valve in the corresponding side cold plate to adjust the temperature of the battery cluster.

9. A battery cell temperature control device for an energy storage system, characterized in that: include: A memory, used to store a cell temperature control program of the energy storage system; A processor is used to implement the steps of the method for controlling the temperature of a battery cell of an energy storage system as claimed in any one of claims 1 to 7 when executing the battery cell temperature control program of the energy storage system.

10. A readable storage medium, characterized in that: The readable storage medium stores a battery cell temperature control program of the energy storage system, and when the battery cell temperature control program of the energy storage system is executed by the processor, the steps of the battery cell temperature control method of the energy storage system according to any one of claims 1 to 7 are implemented.

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