Access detection method, device, equipment, system, storage medium and program product

Abstract

The invention discloses an access detection method, device, equipment and system, a storage medium and a program product. The energy storage equipment comprises a positive electrode busbar, a negative electrode busbar and N battery clusters, voltages of the first battery cluster to the Nth battery cluster are sequentially reduced, and the method comprises the following steps: controlling the first battery cluster to be accessed into the positive electrode busbar and the negative electrode busbar, and performing access detection on the first battery cluster based on a detection voltage when the first battery cluster is accessed, the detection voltage is determined based on the voltage difference between the positive electrode busbar and the negative electrode busbar, and the access detection result comprises whether the positive electrode and the negative electrode of the battery cluster are reversely connected or not; under the condition that the positive electrode and the negative electrode of the first battery cluster are not reversely connected, the negative electrodes of the second battery cluster to the Nth battery cluster are controlled to be sequentially connected to the positive electrode busbar or the negative electrode busbar, and access detection is conducted on all the battery clusters based on the detection voltage when all the battery clusters in the second battery cluster to the Nth battery cluster are connected, and obtaining an access detection result of each battery cluster.

Description

Technical Field

[0001] The present application belongs to the field of energy storage technology, and in particular relates to an access detection method, an access detection device, an electronic device, an energy storage system, a computer-readable storage medium, and a computer program product. Background Art

[0002] At present, the battery cluster of the energy storage device is generally connected to the energy storage inverter to control the charge and discharge of the energy storage device. However, if the positive and negative poles of any battery cluster are connected to the positive and negative poles of the energy storage inverter in reverse, a short circuit problem will occur, thereby affecting the safety of the energy storage device.

[0003] Therefore, timely identification of the reverse connection of the positive and negative poles of the battery cluster is an important measure to ensure the safety of energy storage equipment. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes an access detection method, an access detection device, an electronic device, an energy storage system, a computer-readable storage medium and a computer program product, which can control the access of each battery cluster without adding an additional detection device, and realize the access detection of the battery cluster based on the detection voltage when each battery cluster is connected, and timely identify whether the positive and negative poles of the battery cluster are connected in reverse, so as to ensure the safety of the energy storage device.

[0005] In a first aspect, the present application provides an access detection method, which is applied to an energy storage device, wherein the energy storage device includes a positive bus, a negative bus, and N battery clusters, and the voltages of the first battery cluster to the Nth battery cluster decrease in sequence, and the method includes:

[0006] Controlling the first battery cluster to be connected to the positive bus and the negative bus, and performing a connection detection on the first battery cluster based on a detection voltage when the first battery cluster is connected, so as to obtain a connection detection result of the first battery cluster, wherein the detection voltage is determined based on a voltage difference between the positive bus and the negative bus, and the connection detection result includes whether the positive and negative poles of the battery cluster are connected in reverse;

[0007] When the positive and negative poles of the first battery cluster are not connected reversely, the negative poles of the second battery cluster to the Nth battery cluster are controlled to be connected to the positive bus or the negative bus in sequence, and based on the detection voltage of each battery cluster from the second battery cluster to the Nth battery cluster when connected, connection detection is performed on each battery cluster to obtain the connection detection result of each battery cluster.

[0008] In a second aspect, the present application provides an access detection device, which is applied to an energy storage device, wherein the energy storage device includes a positive bus, a negative bus, and N battery clusters, and the voltages of the first battery cluster to the Nth battery cluster decrease in sequence, and the device includes:

[0009] a first control module, used for controlling the first battery cluster to be connected to the positive bus and the negative bus, and performing a connection detection on the first battery cluster based on a detection voltage when the first battery cluster is connected, so as to obtain a connection detection result of the first battery cluster, wherein the detection voltage is determined based on a voltage difference between the positive bus and the negative bus, and the connection detection result includes whether the positive and negative poles of the battery cluster are connected inversely;

[0010] The second control module is used to control the negative electrodes of the second battery cluster to the Nth battery cluster to be connected to the positive bus or the negative bus when the positive and negative electrodes of the first battery cluster are not connected reversely, and to perform connection detection on each of the battery clusters based on the detection voltage when each of the battery clusters from the second battery cluster to the Nth battery cluster is connected, so as to obtain the connection detection results of each of the battery clusters.

[0011] In a third aspect, the present application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned access detection method when executing the program.

[0012] In a fourth aspect, the present application provides an energy storage system including a positive bus, a negative bus, and N battery clusters, wherein the voltages of the first battery cluster to the Nth battery cluster decrease sequentially; and the above-mentioned electronic device.

[0013] In a fifth aspect, the present application provides a non-transitory computer-readable storage medium having a computer program stored thereon, which implements the above-mentioned access detection method when executed by a processor.

[0014] In a sixth aspect, the present application provides a computer program product, including a computer program, which implements the above-mentioned access detection method when executed by a processor.

[0015] The access detection method, access detection device, electronic device, energy storage system, computer-readable storage medium and computer program product provided in the embodiments of the present application first control the positive and negative electrodes of the first battery cluster with the highest voltage to be connected to the positive bus and the negative bus respectively. At this time, since no other battery clusters are connected, even if the positive and negative electrodes of the first battery cluster are connected reversely, no short circuit problem will occur; and based on the detection voltage determined based on the voltage difference between the positive bus and the negative bus, it is possible to quickly determine whether the positive and negative electrodes of the first battery cluster are connected reversely (there is an obvious difference in the detection voltage when they are connected reversely and when they are not connected reversely), thereby realizing access detection of the first battery cluster.

[0016] Afterwards, when the positive and negative poles of the first battery cluster are not connected reversely, the second battery cluster to the Nth battery cluster are controlled to be connected to the positive bus or the negative bus. Since only the positive or negative pole of the battery cluster is connected to the positive bus or the negative bus, there is no risk of short circuit at this time. When any battery cluster is connected, since the voltage of the first battery cluster with the highest voltage is used as the external terminal voltage of the battery cluster, the detection voltage is also different when the positive or negative pole of any battery cluster is connected. Therefore, while ensuring the safety of battery cluster access, the access detection of each battery cluster is quickly realized, so as to timely determine whether the positive and negative poles of each battery cluster are connected reversely, so as to ensure the safety of the energy storage equipment.

[0017] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 This is an application scenario diagram of the access detection method provided in an embodiment of the present application.

[0020] Figure 2 This is a first flow chart of the access detection method provided in an embodiment of the present application.

[0021] Figure 3 This is a second flow chart of the access detection method provided in an embodiment of the present application.

[0022] Figure 4 It is a schematic diagram of the structure of the energy storage device provided in the embodiment of the present application.

[0023] Figure 5 This is a second flow chart of the access detection method provided in an embodiment of the present application.

[0024] Figure 6 This is a second flow chart of the access detection method provided in an embodiment of the present application.

[0025] Figure 7 It is a module diagram of the access detection device provided in an embodiment of the present application.

[0026] Figure 8 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0027] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0028] At present, the energy management system can perform energy control on the energy storage system, such as charging and discharging control of the energy storage system. When the charging and discharging control of the energy storage system is performed, it is generally achieved by controlling the power conversion system for energy storage (PCS) of the energy storage system.

[0029] The PCS is connected to the energy storage device and is mainly responsible for the conversion of electric energy between AC and DC, as well as the charge and discharge control of the energy storage device. During the energy storage process, it converts the AC power input from the grid into DC power and stores it in the energy storage device; during the discharge process, it converts the DC power output from the energy storage device into AC power and transmits it back to the grid or supplies power to the load.

[0030] However, for energy storage devices with multiple battery clusters, if the positive and negative poles of a battery cluster are connected incorrectly when connected to the PCS, high voltage will be applied (i.e., closing the relay and conducting the charge and discharge circuit) without timely identification, which will cause short circuit burning, which is very dangerous.

[0031] Therefore, the applicant took the above problems into consideration and timely conducted connection detection on the battery cluster based on the detection voltage when the battery cluster was connected, so as to determine whether the positive and negative poles of the battery cluster were connected in reverse, so as to ensure the safety of the energy storage device. In addition, since only the first battery cluster has both positive and negative poles connected, other battery clusters are only connected to the positive or negative pole, thus avoiding the short circuit problem when the battery cluster is connected.

[0032] See also Figure 1 , Figure 1 1 is an application scenario diagram of an access detection method provided in an embodiment of the present application. The application scenario provided in the present application includes an energy storage system 1000, and the energy storage system 1000 includes an energy storage device 100 and an energy management system 200. The access detection method provided in the present application can be executed by at least one of the energy storage device 100 and the energy management system 200. The following is an example of the energy storage device 100 executing the access detection method, which will not be repeated here.

[0033] The electronic device of the present application may be at least one of the energy storage device 100 and the energy management system 200, or the electronic device may also be one or more components of the energy storage device 100 (such as a battery management system, an energy storage inverter, etc.).

[0034] For example, the access detection method may be executed by the energy storage device 100 or the energy management system 200 , or the energy storage device 100 and the energy management system 200 may cooperate to execute the method.

[0035] The energy storage device 100 is a facility that can store electrical energy and release the stored electrical energy when needed, just like a large "power bank".

[0036] For example, the temporary excess power in the power grid can be stored, and when the power consumption peaks or the power grid fails, the power can be sent back to the grid to regulate the power of the grid, stabilize the frequency and voltage of the grid, etc. For another example, energy can be stored when the power price of the grid is cheap, and then the load can be powered to reduce the power cost.

[0037] In some embodiments, the energy storage device 100 includes a plurality of battery clusters 101 and an energy storage converter 102 .

[0038] The multiple battery clusters 101 can be divided into multiple energy storage stacks, and each battery cluster 101 can be composed of one or more battery packs 1011 (such as Figure 1 The battery management system 1012 (BMS) is composed of a PACK as shown.

[0039] For example, the energy storage device includes an energy storage stack with 60 battery packs 1011 arranged in 6 columns, and 10 battery packs 1011 in each column are connected in series and / or in parallel to form a battery cluster 101, forming 6 battery clusters 101 in total.

[0040] The energy storage converter 102 is connected to the energy storage stack, and each energy storage stack is provided with an energy storage converter 102, so as to realize independent charge and discharge control of each energy storage stack.

[0041] That is to say, each battery cluster 101 of the energy storage stack is connected to the energy storage converter 102. For example, the energy storage converter 102 includes a positive bus 1021 and a negative bus 1022, and the positive electrode of each battery cluster 101 is connected to the positive bus 1021, and the negative electrode is connected to the negative bus 1022, so that charging and discharging are realized through the energy storage converter 102.

[0042] Optionally, the battery cluster 101 further includes a first switch element 1013 and a second switch element 1014. When the battery cluster 101 is not connected reversely, the first switch element 1013 is used to connect or disconnect the positive electrode of the battery cluster 101 (i.e., the positive electrode of all battery packs 1011 in the battery cluster 101) and the positive electrode bus 1021, and the second switch element 1014 is used to connect or disconnect the negative electrode of the battery cluster 101 (i.e., the positive electrode of all battery packs 1011 in the battery cluster 101) and the negative electrode bus 1022.

[0043] In this way, by controlling the first switch 1013 and the second switch 1014 to be closed, the connection between the battery cluster 101 and the energy storage converter 102 can be achieved.

[0044] Optionally, the battery cluster 101 further includes a pre-charging circuit 1015 , the pre-charging circuit 1015 includes a third switch element 1016 and a resistor 1017 , and the pre-charging circuit 1015 is connected in parallel with the first switch element 1013 .

[0045] Before closing, in order to prevent the battery cluster 101 from being affected by a large impact current generated by an external load when the first switch 1013 is directly closed, a pre-charging circuit 1015 is further provided. When the battery cluster 101 is connected to the energy storage converter 102, the third switch 1016 is closed first, and the current is limited by the resistor 1017 of the pre-charging circuit 1015, thereby protecting the battery cluster 101. After the battery cluster 101 is connected stably, the third switch 1016 can be disconnected, and the first switch 1013 is closed to achieve normal connection between the battery cluster 101 and the energy storage converter 102. At this time, there is no resistance affecting the charge and discharge current of the battery cluster 101, thereby ensuring the charge and discharge performance of the battery cluster 101.

[0046] Optionally, the switch element (such as the first switch element 1013, the second switch element 1014, or the third switch element 1016) may be a relay.

[0047] Among them, the battery management system 1012 is used to monitor and manage the battery cluster 101, and can obtain information about the battery cluster 101 (such as the charging and discharging voltage of the battery cluster 101) and information of each battery pack 1012. When the battery cluster 101 is charging and discharging, it can achieve charging and discharging balance of each battery pack 1011, and can realize fault detection and processing of the battery cluster 101.

[0048] Energy Management System 200 (Energy Management System, EMS) is a comprehensive system for monitoring, controlling and optimizing energy usage.

[0049] It integrates advanced information technology, automation technology and energy-related expertise, aiming to help various organizations (such as industrial enterprises, commercial buildings, public institutions, etc.) achieve efficient energy management, thereby reducing energy consumption, improving energy utilization efficiency, reducing energy costs, and promoting sustainable development.

[0050] Understandably, Figure 1The number of components of the energy storage system 100 (such as the energy storage inverter 102, the battery cluster 101, etc.) is only an example and is not intended to limit the energy storage system 100. The energy storage system 100 may include more or fewer energy storage inverters 102, battery clusters 101, etc.

[0051] Optionally, the energy management system 200 may include at least one of a terminal device and a server.

[0052] Among them, terminal devices include but are not limited to: smart phones (such as Android phones, IOS phones, etc.), tablet computers, laptops, desktop computers, smart speakers, smart watches, portable personal computers, mobile Internet devices (Mobile Internet Devices, referred to as MID), intelligent voice interaction devices, smart home appliances, vehicle-mounted terminals, aircraft, wearable devices, etc., and the embodiments of the present application do not limit this.

[0053] The terminal device may be integrated with a client, which may be a client having the function of displaying data information such as text, images, audio and video, including but not limited to an instant messaging client (such as a personal instant messaging client (i.e., social software) or an enterprise instant messaging client (i.e., collaborative office software), etc.), a social client (e.g., a content publishing platform client), a browser client, a cloud service control client, an entertainment client (e.g., a game client), a multimedia client (e.g., a video client), an information client (e.g., a news client), a shopping client, a car client, etc. The client may be an independent client or an embedded sub-client integrated in a client (e.g., a social client), which is not limited here.

[0054] The server can be an independent physical server or a server cluster or distributed system composed of multiple physical servers. It can also be a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, CDN (Content Delivery Network), and big data and artificial intelligence platforms, but the embodiments of the present application do not limit this.

[0055] The access detection method involved in this application can be implemented based on cloud technology.

[0056] Among them, cloud technology refers to a hosting technology that unifies hardware, software, network and other resources within a wide area network or local area network to achieve data calculation, storage, processing and sharing.

[0057] Cloud technology is a general term for network technology, information technology, integration technology, management platform technology, application technology, etc. based on the cloud computing business model. It can form a resource pool, which can be used on demand and is flexible and convenient. Cloud computing technology will become an important support. The backend services of the technical network system require a large amount of computing and storage resources, such as video websites, picture websites and more portal websites. With the rapid development and application of the Internet industry, in the future, each item may have its own identification mark, which needs to be transmitted to the backend system for logical processing. Data of different levels will be processed separately. All kinds of industry data need strong system backing support, which can only be achieved through cloud computing.

[0058] The access detection method of the present application can be implemented based on cloud computing. Cloud computing is a computing model that distributes computing tasks on a resource pool composed of a large number of computers, so that various application systems can obtain computing power, storage space and information services as needed. The network that provides resources is called a "cloud". The resources in the "cloud" are infinitely expandable in the eyes of users, and can be obtained at any time, used on demand, expanded at any time, and paid for by use.

[0059] As a provider of basic cloud computing capabilities, a cloud computing resource pool (referred to as a cloud platform, generally referred to as an IaaS (Infrastructure as a Service) platform) will be established, and various types of virtual resources will be deployed in the resource pool for external customers to choose to use. The cloud computing resource pool mainly includes: computing devices (virtualized machines, including operating systems), storage devices, and network devices.

[0060] Based on the introduction of the above-mentioned related scenarios, the embodiment of the present application provides an access detection method, which is described in detail below:

[0061] See also Figure 2 An access detection method provided in an embodiment of the present application is implemented by steps 011 and 012, which are described in detail below.

[0062] Step 011: Control the first battery cluster to be connected to the positive bus and the negative bus, and perform a connection detection on the first battery cluster based on the detection voltage when the first battery cluster is connected, so as to obtain a connection detection result of the first battery cluster.

[0063] Before the access detection is performed, the battery clusters may be sorted from high to low based on the voltages of the battery clusters, thereby determining the first battery cluster to the Nth battery cluster whose charge and discharge voltages are arranged from high to low.

[0064] For example, the energy storage device can obtain the voltage information reported by the battery management system of each battery cluster (such as the charging and discharging voltage of the battery cluster); based on the voltage information of each battery cluster, sort the battery clusters to determine the 1st to Nth battery clusters arranged from high to low in charging and discharging voltage.

[0065] Among them, the first battery cluster is the battery cluster with the highest voltage among the N battery clusters.

[0066] The detection voltage is determined based on the voltage difference between the positive bus and the negative bus, and the access detection result includes whether the positive and negative poles of the battery cluster are connected reversely.

[0067] After determining the voltage sequence of each battery cluster, the energy storage device first controls the first battery cluster to be connected to the positive bus and the negative bus.

[0068] Optionally, the first switch and the second switch of the first battery cluster can be controlled to be closed. At this time, the first battery cluster is directly connected to the energy storage converter.

[0069] Optionally, the time difference between the closing time of the second switch element of the first battery cluster and the closing time of the third switch element is greater than a preset delay time. That is, after the second switch element is closed, the third switch element is closed after a preset delay time (such as 100 milliseconds, 150 milliseconds, etc.) to facilitate software control.

[0070] Optionally, the third switch element and the second switch element of the first battery cluster may be controlled to be closed, so as to implement access protection for the first battery cluster through the pre-charge current.

[0071] After the first battery cluster is connected to the energy storage inverter, the energy storage inverter or the battery management system of the first battery cluster can collect the voltages of the positive bus and the negative bus, thereby determining the detection voltage of the first battery cluster by the voltage difference between the positive bus and the negative bus.

[0072] Then, the connection detection of the first battery cluster is implemented by the detection voltage of the first battery cluster to obtain the connection detection result of the first battery cluster.

[0073] It can be understood that when the positive and negative poles of the first battery cluster are not connected in reverse, the voltage of the positive bus is higher than that of the negative bus, and when the positive and negative poles of the first battery cluster are connected in reverse, the voltage of the positive bus is lower than that of the negative bus. Therefore, by checking whether the detection voltage of the first battery cluster is within the preset voltage range, it can be quickly determined whether the positive and negative poles of the first battery cluster are connected in reverse.

[0074] For example, when the detection voltage of the first battery cluster is outside the preset voltage range (such as less than or equal to 0), it is determined that the positive and negative poles of the first battery cluster are connected in reverse; when the detection voltage of the first battery cluster is outside the preset voltage range (such as greater than 0), it is determined that the positive and negative poles of the first battery cluster are not connected in reverse.

[0075] In this way, since no other battery clusters are connected to the energy storage converter at this time, the positive and negative electrodes of the first battery cluster are both connected to the energy storage converter without causing a short circuit problem, and the connection detection of the first battery cluster is achieved while ensuring the connection safety. In addition, the first battery cluster with the highest voltage can also be used as the external voltage of the subsequently connected battery clusters, thereby facilitating the connection detection of the subsequent battery clusters.

[0076] Step 012: When the positive and negative poles of the first battery cluster are not connected reversely, the negative poles of the second battery cluster to the Nth battery cluster are controlled to be connected to the positive bus or the negative bus, and based on the detection voltage when each battery cluster from the second battery cluster to the Nth battery cluster is connected, each battery cluster is respectively connected to detect to obtain the connection detection result of each battery cluster.

[0077] In the case that the positive and negative electrodes of the first battery cluster are not connected reversely, the negative electrodes of the second battery cluster to the Nth battery cluster can be controlled to be connected to the positive bus or the negative bus.

[0078] Optionally, the second switch elements of the second battery cluster to the Nth battery cluster may be controlled to be closed in sequence or simultaneously.

[0079] If the second switch elements of the second battery cluster to the Nth battery cluster are controlled to close in sequence, it is beneficial to software control, and the sequential closing can perform access detection on the battery clusters one by one. Once the positive and negative poles of a battery cluster are connected reversely, there is no need to control other unconnected battery clusters to continue to connect, which avoids the loss caused by the closure of the relay and is beneficial to the processing capacity of the access detection.

[0080] Optionally, see Figure 3 Step 012, controlling the negative electrodes of the second battery cluster to the Nth battery cluster to be connected to the positive bus or the negative bus, including:

[0081] Step 0121: When the positive and negative electrodes of the Mth battery cluster are not connected reversely, the negative electrode of the M+1th battery cluster is controlled to be connected to the positive bus or the negative bus, M is within the interval [2, N], and the initial value of M is 2;

[0082] Step 0122: add 1 to M, and execute again the step of controlling the negative electrode of the M+1th battery cluster to be connected to the positive bus or the negative bus when the Mth battery cluster is not connected reversely, until M reaches N-1.

[0083] Specifically, for the sequential closing method, after the second switch of any battery cluster, access detection can be performed to determine whether the battery cluster is connected in reverse. If the battery cluster is connected in reverse, there is no need to perform subsequent access operations, reducing the loss caused by relay closure. If the battery cluster is not connected in reverse, the next battery cluster can be connected, and access detection of each battery cluster is implemented one by one.

[0084] For example, after the negative pole of the second battery cluster is connected, if it is not connected inversely, the third battery cluster is controlled to be connected; if it is connected inversely, the third battery cluster to the Nth battery cluster do not need to be connected again.

[0085] After the negative pole of the third battery cluster is connected, if it is not connected reversely, the fourth battery cluster is controlled to be connected, and this cycle is repeated until the N-1th battery cluster is connected. If it is not connected reversely, the last Nth battery cluster is controlled to be connected, and the connection detection from the second battery cluster to the Nth battery cluster can be completed one by one.

[0086] If the second switch elements of the second battery cluster to the Nth battery cluster are controlled to be closed simultaneously, the connection detection of the second battery cluster to the Nth battery cluster can be realized simultaneously, and the detection efficiency is high.

[0087] It can be understood that since only the negative electrodes of the second battery cluster to the Nth battery cluster are connected to the positive electrode bus or the negative electrode bus, the short circuit problem can be avoided.

[0088] Optionally, the battery management system of any battery cluster from the second battery cluster to the Nth battery cluster is used to detect a detection voltage of the battery cluster.

[0089] For example, see Figure 4 The battery management system 1012 of the battery cluster 101 includes a first detection interface 1018 and a second detection interface 1019. The battery management system 1012 of any battery cluster 101 determines the detection voltage corresponding to the battery cluster 101 based on the voltage difference between the first detection interface 1018 and the second detection interface 1019. The first detection interface 1018 is connected to the positive bus 1021. When the battery cluster 101 is not connected reversely, the second detection interface 1019 is connected to the negative bus 1022. When the battery cluster 101 is connected reversely, the second detection interface 1019 is connected to the positive bus 1021.

[0090] Furthermore, since the first battery cluster is used as the external terminal voltage, when the negative electrode of any battery cluster from the second battery cluster to the Nth battery cluster is connected to the positive electrode bus or the negative electrode bus, the detection voltage is different.

[0091] Therefore, the battery cluster can be connected to the test voltage of any battery cluster to obtain the test result of the battery cluster. For example, by judging whether the test voltage of any battery cluster is within the preset voltage range, it can be quickly determined whether the positive and negative poles of the battery cluster are connected in reverse.

[0092] For example, when the detection voltage of any battery cluster is outside the preset voltage range (such as less than or equal to 0), it is determined that the positive and negative poles of the first battery cluster are connected in reverse; when the detection voltage of the first battery cluster is outside the preset voltage range (such as greater than 0), it is determined that the positive and negative poles of the first battery cluster are not connected in reverse.

[0093] The access detection method of the present application first controls the positive and negative electrodes of the first battery cluster with the highest voltage to be connected to the positive bus and the negative bus respectively. At this time, since no other battery clusters are connected, even if the positive and negative electrodes of the first battery cluster are connected reversely, no short circuit problem will occur; and based on the detection voltage determined based on the voltage difference between the positive bus and the negative bus, it is possible to quickly determine whether the positive and negative electrodes of the first battery cluster are connected reversely (there is an obvious difference in the detection voltage when they are connected reversely and not reversely), thereby realizing access detection of the first battery cluster.

[0094] Afterwards, when the positive and negative poles of the first battery cluster are not connected reversely, the second battery cluster to the Nth battery cluster are controlled to be connected to the positive bus or the negative bus. Since only the positive or negative pole of the battery cluster is connected to the positive bus or the negative bus, there is no risk of short circuit at this time. When any battery cluster is connected, since the voltage of the first battery cluster with the highest voltage is used as the external terminal voltage of the battery cluster, the detection voltage is also different when the positive or negative pole of any battery cluster is connected. Therefore, while ensuring the safety of battery cluster access, the access detection of each battery cluster is quickly realized, so as to timely determine whether the positive and negative poles of each battery cluster are connected reversely, so as to ensure the safety of the energy storage equipment.

[0095] In some embodiments, see Figure 5 , Figure 5 The access detection method also includes steps 013 to 015, which are described in detail below.

[0096] Step 013: When the second switch elements of each battery cluster are closed and the positive and negative electrodes of each battery cluster are not reversely connected, close the third switch elements of each battery cluster;

[0097] Step 014: After the third switch elements of all battery clusters are closed, the first switch element of each battery cluster is closed;

[0098] Step 015: After the first switch elements of each battery cluster are closed, the third switch elements of all battery clusters are opened.

[0099] Specifically, when the negative electrodes of the second battery cluster to the Nth battery cluster are all connected to the energy storage inverter (i.e., the second switch elements of the second battery cluster to the Nth battery cluster are all closed), and the negative electrodes of the second battery cluster to the Nth battery cluster are not reversely connected, subsequent connection operations can be performed.

[0100] At this time, since the positive electrodes of the second to Nth battery clusters are not connected, the third switch of each battery cluster can be closed first, for example, the third switch of each battery cluster can be closed in sequence or simultaneously, so as to realize the connection protection of each battery cluster.

[0101] After the third switch elements of each battery cluster from the second to the Nth battery cluster are closed, the first switch elements of each battery cluster can be closed. After the first switch elements of each battery cluster are closed, the third switch elements of each battery cluster can be disconnected, thereby completing the accurate connection of each battery cluster with the energy storage inverter.

[0102] In this way, each battery cluster can be accurately connected to the energy storage converter while achieving access detection and access protection.

[0103] In some embodiments, see Figure 6 , Figure 6 016 is a flowchart of the access detection method provided in the embodiment of the present application. The access detection method also includes step 016, which is described in detail below.

[0104] Step 016: When the positive and negative electrodes of any battery cluster among the N battery clusters are connected in reverse, a high voltage operation is performed.

[0105] The lower high voltage operation refers to the operation of disconnecting each battery cluster from the energy storage converter, which may include at least one of the following:

[0106] (1) Stop controlling the battery clusters that have not yet been connected to the positive bus or negative bus;

[0107] (2) Reporting access detection results;

[0108] (3) Disconnect each connected battery cluster from the positive bus and the negative bus.

[0109] Specifically, when each battery cluster is connected, if the positive and negative poles of any battery cluster are connected in reverse, the energy storage stack can no longer be connected to the energy storage inverter. It is necessary to adjust the connection relationship of the reversely connected battery cluster before connecting each battery cluster and the energy storage inverter.

[0110] Therefore, when the positive and negative electrodes of any battery cluster among the N battery clusters are connected in reverse, the high voltage operation is performed.

[0111] Among them, by stopping the control of the battery clusters that have not been connected to the positive bus or negative bus, unnecessary relay closing operations can be avoided and relay losses can be reduced. By reporting the access detection results, maintenance personnel can be notified to quickly perform maintenance and correct the connection relationship of the reversed battery cluster, thereby ensuring that the reversed battery cluster can be correctly connected to the energy storage inverter. By disconnecting each connected battery cluster from the positive bus and the negative bus, unnecessary power loss of the battery cluster can be avoided while ensuring the safety of the battery cluster.

[0112] According to the method described in the above embodiment, the present application embodiment also provides an access detection device 300, which is used to perform the steps in the above access detection method. Figure 7 , Figure 7 3 is a schematic diagram of a module of an access detection device 300 provided in an embodiment of the present application. The access detection device 300 includes:

[0113] The first control module 301 is used to control the first battery cluster to be connected to the positive bus and the negative bus, and perform a connection detection on the first battery cluster based on the detection voltage when the first battery cluster is connected, so as to obtain a connection detection result of the first battery cluster, wherein the detection voltage is determined based on the voltage difference between the positive bus and the negative bus, and the connection detection result includes whether the positive and negative poles of the battery cluster are connected reversely;

[0114] The second control module 302 is used to control the negative electrodes of the second battery cluster to the Nth battery cluster to be connected to the positive bus or the negative bus when the positive and negative electrodes of the first battery cluster are not connected reversely, and to perform connection detection on each battery cluster based on the detection voltage when each battery cluster from the second battery cluster to the Nth battery cluster is connected, so as to obtain the connection detection result of each battery cluster. It should be noted that the specific details of each module unit in the above-mentioned connection detection device have been described in detail in the embodiment of the above-mentioned connection detection method, and will not be repeated here.

[0115] In the embodiments of the present application, the term "module" or "unit" refers to a computer program or a part of a computer program with a predetermined function, and works together with other related parts to achieve a predetermined goal, and can be implemented in whole or in part by using software, hardware (such as processing circuits or memories) or a combination thereof. Similarly, a processor (or multiple processors or memories) can be used to implement one or more modules or units. In addition, each module or unit can be part of an overall module or unit that includes the function of the module or unit.

[0116] In some embodiments, the access detection device in the embodiments of the present application can be implemented in hardware, such as an electronic device, or a component in an electronic device, such as an integrated circuit or a chip; the access detection device can also be implemented in software, such as as an application installed in an electronic device.

[0117] In some embodiments, see Figure 8 , Figure 8 5 is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. The electronic device 500 includes a processor 501 and a memory 502. The memory 502 stores a computer program 503 that can be run on the processor 501. When the program 503 is executed by the processor 501, each process of the embodiment of the above-mentioned function restriction method is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0118] An embodiment of the present application also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the various processes of the embodiment of the above-mentioned access detection method are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0119] The processor may be a processor in the electronic device in the above embodiment. The computer readable storage medium may be a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.

[0120] Computer readable media may include computer storage media and communication media. Computer storage media include volatile and non-volatile, removable and non-removable media implemented by any method or technology for storing information such as computer readable instructions, data structures, program modules or other data. Computer storage media include RAM, ROM, Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), flash memory or other solid-state memory technology, CD-ROM, Digital Versatile Disc (DVD) or other optical storage, cassettes, magnetic tapes, disk storage or other magnetic storage devices. Of course, those skilled in the art will know that computer storage media are not limited to the above.

[0121] The embodiment of the present application also provides a computer program product, including a computer program, which implements the above-mentioned access detection method when executed by a processor. The processor may be a processor in the electronic device in the above-mentioned embodiment. When the computer program is executed by the processor, each process of the embodiment of the above-mentioned access detection method is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0122] It is understandable that in the specific implementation of this application, data related to user identity or characteristics is involved. When the above embodiments of this application are applied to specific products or technologies, user permission or consent is required, and the collection, use and processing of relevant data need to comply with relevant laws, regulations and standards of relevant countries and regions.

[0123] In the description of this specification, the descriptions with reference to the terms "certain embodiments", "in an example", "exemplarily", etc., mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0124] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0125] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An access detection method, characterized in that: Applied to an energy storage device, the energy storage device includes a positive bus, a negative bus and N battery clusters, the voltages of the first battery cluster to the Nth battery cluster decrease in sequence, and the method includes: Controlling the first battery cluster to be connected to the positive bus and the negative bus, and performing a connection detection on the first battery cluster based on a detection voltage when the first battery cluster is connected, so as to obtain a connection detection result of the first battery cluster, wherein the detection voltage is determined based on a voltage difference between the positive bus and the negative bus, and the connection detection result includes whether the positive and negative poles of the battery cluster are connected in reverse; When the positive and negative poles of the first battery cluster are not connected reversely, the negative poles of the second to Nth battery clusters are controlled to be connected to the positive bus or the negative bus, and based on the detection voltage of each of the battery clusters from the second to Nth battery clusters when connected, connection detection is performed on each of the battery clusters to obtain the connection detection results of each of the battery clusters.

2. The access detection method according to claim 1, characterized in that: The battery cluster includes a first switch and a second switch. When the battery cluster is not connected reversely, the first switch is used to connect or disconnect the positive electrode of the battery cluster with the positive electrode bus, and the second switch is used to connect or disconnect the negative electrode of the battery cluster with the negative electrode bus. The controlling the first battery cluster to be connected to the positive bus and the negative bus comprises: Controlling the first switch element and the second switch element of the first battery cluster to be closed; The controlling the negative electrodes of the second battery cluster to the Nth battery cluster to be connected to the positive electrode bus or the negative electrode bus comprises: The second switch elements of the second battery cluster to the Nth battery cluster are controlled to be closed in sequence or simultaneously.

3. The access detection method according to claim 2, characterized in that: The battery cluster further comprises a pre-charging circuit, the pre-charging circuit comprises a third switch element and a resistor, and the pre-charging circuit is connected in parallel with the first switch element; The controlling the first battery cluster to be connected to the positive bus and the negative bus comprises: The third switch element and the second switch element of the first battery cluster are both controlled to be closed.

4. The access detection method according to claim 3, characterized in that: Also includes: When the second switch elements of each battery cluster are closed and the positive and negative poles of each battery cluster are not reversely connected, closing the third switch elements of each battery cluster; After the third switch elements of all battery clusters are closed, closing the first switch element of each battery cluster; After the first switch elements of each of the battery clusters are closed, the third switch elements of all the battery clusters are opened.

5. The access detection method according to claim 1, characterized in that: The controlling the negative electrodes of the second battery cluster to the Nth battery cluster to be connected to the positive electrode bus or the negative electrode bus comprises: When the positive and negative electrodes of the Mth battery cluster are not connected reversely, the negative electrode of the M+1th battery cluster is controlled to be connected to the positive bus or the negative bus, M is within the interval [2, N], and the initial value of M is 2; M is increased by 1, and the step of controlling the negative electrode of the M+1th battery cluster to be connected to the positive bus or the negative bus when the Mth battery cluster is not connected reversely is performed again, until M reaches N-1.

6. The access detection method according to claim 1, characterized in that: The performing connection detection on each of the N battery clusters based on the detection voltage of each of the battery clusters when connected to obtain the connection detection result of each of the battery clusters includes: When the detected voltage of any battery cluster among the N battery clusters when connected is outside the preset voltage range, determining that the positive and negative poles of the battery cluster are connected in reverse; When the detected voltage of any battery cluster among the N battery clusters when connected is within a preset voltage range, it is determined that the positive and negative poles of the battery cluster are not connected reversely.

7. The access detection method according to claim 1 or 6, characterized in that: The energy storage device also includes an energy storage inverter, which is connected to both the positive bus and the negative bus. The battery cluster includes a battery management system. The energy storage inverter is used to detect the detection voltage when the first battery cluster is connected to the positive bus and the negative bus. The battery management system of any battery cluster from the second battery cluster to the Nth battery cluster is used to detect the detection voltage of any battery cluster.

8. The access detection method according to claim 7, characterized in that: The battery management system includes a first detection interface and a second detection interface. The battery management system determines the detection voltage corresponding to the battery cluster based on the voltage difference between the first detection interface and the second detection interface. The first detection interface is connected to the positive bus. When the battery cluster is not connected reversely, the second detection interface is connected to the negative bus.

9. The access detection method according to claim 1, characterized in that: Also includes: When the positive and negative electrodes of any battery cluster among the N battery clusters are connected in reverse, a high voltage operation is performed; the high voltage operation includes at least one of the following: Stop controlling the battery cluster that has not been connected to be connected to the positive bus or the negative bus; Report access detection results; The connected battery clusters are disconnected from the positive bus bar and the negative bus bar.

10. The access detection method according to claim 1, characterized in that: Before controlling the first battery cluster to be connected to the positive bus and the negative bus, and performing a connection detection on the first battery cluster based on a detection voltage when the first battery cluster is connected to obtain a connection detection result of the first battery cluster, the method further includes: Obtaining voltage information reported by the battery management system of each of the battery clusters; The battery clusters are sorted based on voltage information of the battery clusters to determine the N battery clusters.

11. An access detection device, characterized in that: Applied to energy storage equipment, the energy storage equipment includes a positive bus, a negative bus and N battery clusters, the voltages of the first battery cluster to the Nth battery cluster decrease in sequence, and the device includes: a first control module, used for controlling the first battery cluster to be connected to the positive bus and the negative bus, and performing a connection detection on the first battery cluster based on a detection voltage when the first battery cluster is connected, so as to obtain a connection detection result of the first battery cluster, wherein the detection voltage is determined based on a voltage difference between the positive bus and the negative bus, and the connection detection result includes whether the positive and negative poles of the battery cluster are connected inversely; The second control module is used to control the negative electrodes of the second battery cluster to the Nth battery cluster to be connected to the positive bus or the negative bus when the positive and negative electrodes of the first battery cluster are not connected reversely, and to perform connection detection on each of the battery clusters based on the detection voltage when each of the battery clusters from the second battery cluster to the Nth battery cluster is connected, so as to obtain the connection detection results of each of the battery clusters.

12. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the access detection method according to any one of claims 1 to 10 when executing the program.

13. An energy storage system, characterized in that: include: The voltages of the positive bus, the negative bus and the N battery clusters, from the first battery cluster to the Nth battery cluster, decrease in sequence; and The electronic device as claimed in claim 12.

14. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the access detection method according to any one of claims 1 to 10 is implemented.

15. A computer program product, characterized in that It comprises a computer program, which, when executed by a processor, implements the access detection method according to any one of claims 1 to 10.

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