An on-line capacity verification device and method for a storage battery

Abstract

The present application provides an on-line capacity verification device and method for a storage battery, which relates to the technical field of storage battery capacity verification. By adding a bidirectional AC / DC converter between the series-connected storage battery pack and the AC power grid, it can support the bidirectional flow of electric energy under different working conditions. It can not only supply power from the AC power grid to the DC bus, but also feedback the electric energy in the DC bus to the AC power grid during battery capacity verification, increasing the flexibility of the system. During the discharge process, hysteresis voltage control is adopted to keep the output current of the storage battery unchanged, which can make full use of the energy of the storage battery, accelerate the capacity verification process, and reduce the bus voltage fluctuation. Based on the solution proposed in the present application, on-line capacity verification can be realized, reducing manual intervention and realizing the reuse of discharged electric energy.

Description

Technical Field

[0001] The present application relates to the technical field of battery capacity verification, and particularly relates to an on-line battery capacity verification device and method. Background Art

[0002] In the prior art, when verifying the capacity of the battery in the DC system of a substation, it is necessary to disconnect from the bus for capacity verification, which requires a large amount of manpower, and the energy stored in the battery will be wasted during capacity verification. The battery can only be charged from the AC power grid, and this one-way charging method limits the flexibility of power dispatching. Especially during peak load periods, the electrical energy stored in the battery cannot be fed back to the AC power grid to achieve peak shaving and valley filling, resulting in a certain amount of electrical energy waste. In addition, during the capacity verification process, the circuit is not adjusted according to voltage fluctuations, and the voltage stability is not considered. Summary of the Invention

[0003] The present application aims to at least solve one of the technical problems in the related art to some extent.

[0004] To this end, the first object of the present application is to propose an on-line battery capacity verification device.

[0005] The second object of the present application is to propose an on-line battery capacity verification method.

[0006] The third object of the present application is to propose an electronic device.

[0007] The fourth object of the present application is to propose a computer-readable storage medium.

[0008] The fifth object of the present application is to propose a computer program product.

[0009] To achieve the above object, an embodiment of the first aspect of the present application proposes an on-line battery capacity verification device, including:

[0010] A DC bus for providing a DC power supply for the load;

[0011] At least one battery pack connected to the DC bus for supplying power to the DC bus and the load during the capacity verification process;

[0012] A bidirectional AC / DC module connected to the battery pack for realizing bidirectional current conversion between the AC power grid, the battery pack, and the DC bus;

[0013] A first contactor connected in series between the battery pack and the DC bus for controlling the connection and disconnection between the battery pack and the DC bus;

[0014] A second contactor connected in series in the positive electrode circuit of the battery pack for controlling the connection between the battery pack and the bidirectional AC / DC module;

[0015] A third contactor, connected in series in the negative electrode circuit of the battery pack, is used to control the connection between the bidirectional AC / DC module and the AC power grid;

[0016] A control module, connected to the first contactor, the second contactor, and the third contactor, is used to control the opening and closing states of each contactor according to the voltage of the DC bus and the state of the battery, so as to dynamically adjust the discharge path of the battery pack.

[0017] Optionally, it further includes: a battery monitoring module, which is used to monitor the voltage of the DC bus, the discharge current of the battery pack, the voltage of the single battery in the battery pack, the internal resistance of the single battery, and the temperature of the single battery.

[0018] Optionally, the control module is further used for:

[0019] When the voltage of the DC bus is normal, control the first contactor to close, so that the battery pack supplies power to the load alone;

[0020] When the voltage of the DC bus is higher than the set highest threshold, control the second contactor and the third contactor to close, so that the battery pack supplies power to the DC bus and the AC power grid at the same time;

[0021] When the voltage of the DC bus is lower than the set lowest threshold, control the bidirectional AC / DC module to supplement electric energy to the DC bus from the AC power grid through the third contactor, and supply power to the load together with the battery pack.

[0022] To achieve the above object, the second aspect embodiment of the present application proposes a method for online capacity verification of a battery, including:

[0023] When preset conditions are met, start the capacity verification process of the battery pack, and control the battery pack to discharge to the DC bus with a constant current;

[0024] Real-time detect the voltage of the DC bus, and dynamically adjust the discharge path according to the fluctuation range of the voltage of the DC bus, so as to ensure that the voltage of the DC bus is within a preset stable range;

[0025] When the battery pack reaches the discharge capacity verification termination condition, control the battery pack to stop discharging;

[0026] After the discharge is completed, perform constant current and constant voltage charging on the battery pack from the AC power grid through the bidirectional AC / DC module until the battery pack reaches the charging completion state.

[0027] Optionally, the starting the capacity verification process of the battery pack when preset conditions are met includes:

[0028] When the time since the last capacity verification exceeds the preset period and the state of the battery pack is normal, start the capacity verification process of the battery pack.

[0029] Optionally, the real-time detection of the DC bus voltage and the dynamic adjustment of the discharge path according to the fluctuation range of the DC bus voltage to ensure that the DC bus voltage is within the preset stable range includes:

[0030] When the DC bus voltage is higher than the preset highest threshold control the battery pack to discharge to the DC bus, and feed the excess electric energy back to the AC power grid through the bidirectional AC / DC module;

[0031] When the DC bus voltage is within range, keep the current discharge path unchanged, control the battery pack to continue to supply power to the DC bus, but do not feed electric energy back to the AC power grid, where is the hysteresis voltage;

[0032] When the DC bus voltage is within range, control the battery pack to supply power only to the load;

[0033] When the DC bus voltage is lower than the preset lowest threshold control the bidirectional AC / DC module to supply power from the AC power grid to the DC bus and supply power to the load together with the battery pack.

[0034] Optionally, when the battery pack reaches the discharge capacity verification termination condition, controlling the battery pack to stop discharging includes:

[0035] During the capacity verification process, the voltage of each single cell in the battery pack is monitored in real time. When the voltage of any single cell reaches the preset termination voltage, control the contactor connected in parallel with this single cell to close to avoid over-discharging of this cell;

[0036] When the voltages of all single cells in the battery pack reach the preset termination voltage, stop the discharge process and the discharge ends.

[0037] Optionally, the constant current and voltage-limited charging of the battery pack from the AC power grid through the bidirectional AC / DC module until the battery pack reaches the charging completion state includes:

[0038] Use the bidirectional AC / DC module to convert alternating current into direct current and start charging the battery pack;

[0039] During the charging process, continuously monitor the charging status of the battery pack. If the charging status is abnormal, pause or exit the charging process;

[0040] If the charging status is normal, check whether the battery pack meets the charging cut-off condition. When it is detected that the charging cut-off condition is met, stop the charging process and the charging process is completed.

[0041] To achieve the above object, an embodiment of the third aspect of the present application provides an electronic device, including: a processor, and a memory communicatively connected to the processor;

[0042] The memory stores computer-executable instructions;

[0043] The processor executes the computer-executable instructions stored in the memory to implement the method described in any one of the second aspects.

[0044] To achieve the above object, an embodiment of the fourth aspect of the present application provides a computer-readable storage medium, in which computer-executable instructions are stored, and when the computer-executable instructions are executed by a processor, they are used to implement the method described in any one of the second aspects.

[0045] To achieve the above object, an embodiment of the fifth aspect of the present application provides a computer program product, and when the computer program is executed by a processor, it implements the method described in any one of the second aspects.

[0046] The technical solutions provided by the embodiments of the present application at least bring the following beneficial effects:

[0047] Through hysteresis voltage control, the device can cope with the fluctuations of the bus voltage, automatically adjust the discharge path to keep the bus voltage within a reasonable range, thereby avoiding frequent device switching and ensuring the stability of the device during the capacity verification process; the use of the bidirectional AC / DC module not only meets the charging and discharging requirements, but also simplifies the design of the control and communication systems, reduces the cost of system design and control, and at the same time realizes a more flexible switching of the charging and discharging paths; during the capacity verification process, the device maintains a constant discharge current of the battery, and can maintain the accuracy of the capacity verification regardless of how the discharge path changes, avoiding the problem of capacity verification interruption caused by bus voltage loss, thereby significantly shortening the capacity verification time and improving the capacity verification efficiency.

[0048] The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. Description of the Drawings

[0049] The above and / or additional aspects and advantages of the present application will become obvious and easy to understand from the following description of the embodiments in conjunction with the drawings, where:

[0050] Figure 1 The structural diagram of an on - line capacity verification device for a storage battery provided by an embodiment of the present application;

[0051] Figure 2 The schematic flow chart of an on - line capacity verification method for a storage battery provided by an embodiment of the present application;

[0052] Figure 3 The schematic flow chart of an on - line capacity verification method for a storage battery provided by an embodiment of the present application

[0053] Figure 4 The current schematic diagram when the storage battery pack only supplies power to the load provided by an embodiment of the present application;

[0054] Figure 5 The current schematic diagram when the storage battery pack supplies power to the load and the AC power grid simultaneously provided by an embodiment of the present application;

[0055] Figure 6 The current schematic diagram when the storage battery pack and the AC power grid jointly supply power to the load provided by an embodiment of the present application;

[0056] Figure 7 The schematic flow chart of the process of charging the storage battery pack provided by an embodiment of the present application. Detailed implementation manners

[0057] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and should not be construed as a limitation to the present application.

[0058] The traditional substation storage battery capacity verification test device and mode have the problems of long time consumption, high labor cost, and cumbersome process. It is necessary to disconnect from the DC bus to perform capacity verification on the storage battery pack, and an external discharge load needs to be connected during the capacity verification of the storage battery pack.

[0059] To solve this problem, the embodiments of the present application provide an on - line capacity verification device for a storage battery. By adding a bidirectional AC / DC converter between the series - connected storage battery pack and the AC power grid, it can support the bidirectional flow of electric energy under different working conditions. It can not only supply power from the AC power grid to the DC bus, but also feedback the electric energy in the DC bus to the AC power grid during battery capacity verification, increasing the flexibility of the system. During the discharge process, hysteresis voltage control is adopted to keep the output current of the storage battery unchanged, which can make full use of the energy of the storage battery, speed up the capacity verification process, and reduce the fluctuation of the bus voltage. Based on the solution proposed in the present application, on - line capacity verification can be realized, reducing human intervention and realizing the reuse of discharge electric energy.

[0060] Figure 1 This is a structural diagram of an on-line capacity verification device for a storage battery provided by an embodiment of the present application. As Figure 1 shown, the device includes: a DC bus, a storage battery pack, a bidirectional AC / DC module, a first contactor, a second contactor, a third contactor, a control module, and a battery monitoring module.

[0061] In an embodiment of the present application, the DC bus is used to provide a DC power supply for a load; a plurality of storage battery packs are connected to the DC bus and are used to supply power to the DC bus and the load during the capacity verification process; the first contactor is connected in series between the storage battery pack and the DC bus and is used to control the connection and disconnection between the storage battery pack and the DC bus; the second contactor is connected in series in the positive electrode circuit of the storage battery pack and is used to control the connection between the storage battery pack and the bidirectional AC / DC module; the third contactor is connected in series in the negative electrode circuit of the storage battery pack and is used to control the connection between the bidirectional AC / DC module and the AC power grid; the bidirectional AC / DC module is connected to the storage battery pack and is used to realize bidirectional current conversion among the AC power grid, the storage battery pack, and the DC bus.

[0062] In practical applications, multiple storage battery packs may be required according to the requirements of the load, and the present application does not specifically limit the number of storage battery packs. Referring to the embodiment as Figure 1 shown, there are two storage battery packs in the device, namely storage battery pack B1 and storage battery pack B2, which are used to supply power to the DC bus and the load during the capacity verification process.

[0063] It can be understood that when there are multiple storage battery packs, there are also multiple corresponding bidirectional AC / DC modules. As Figure 1 shown, different bidirectional AC / DC modules are connected to storage battery pack B1 and storage battery pack B2 and are used to realize bidirectional current conversion among the AC power grid, the storage battery, and the DC bus, so as to feed back the electric energy of the storage battery to the AC power grid when the bus voltage is too high, or supplement electric energy from the AC power grid to the DC bus when the bus voltage is too low.

[0064] Similarly, referring to Figure 1 , the first contactors K21 and K22 are respectively connected in series between storage battery pack B1 and storage battery pack B2 and the DC bus and are used to control the connection and disconnection between the storage battery pack and the DC bus. The second contactors K31 and K32 are respectively connected in series in the positive electrode circuits of storage battery pack B1 and storage battery pack B2 and are used to control the connection between the storage battery pack and the bidirectional AC / DC module. The third contactors K41 and K42 are respectively connected in series in the negative electrode circuits of storage battery pack B1 and storage battery pack B2 and are used to control the connection between the bidirectional AC / DC module and the AC power grid.

[0065] In addition, the device proposed by the present application further includes a control module and a battery monitoring module.

[0066] Specifically, the control module is connected to contactors K21, K22, K31, K32, K41, and K42, and is used to control the opening and closing states of each contactor according to the voltage of the DC bus and the state of the battery, so as to dynamically adjust the discharge path of the battery and implement different power supply modes according to different DC bus voltage ranges.

[0067] In the embodiment of the present application, the control module has the following functions:

[0068] When the DC bus voltage is normal, control contactor K21 or K22 to close, so that the battery pack supplies power to the load alone; when the DC bus voltage is higher than the set highest threshold, control contactors K31 and K41 or contactors K32 and K42 to close, so that the battery pack supplies power to the DC bus and the AC grid at the same time; when the DC bus voltage is lower than the set lowest threshold, control the bidirectional AC / DC module to supplement electrical energy to the DC bus from the AC grid through contactor K41 or K42, and supply power to the load together with the battery pack.

[0069] In the embodiment of the present application, the battery monitoring module is used to monitor the voltage of the DC bus, the discharge current of the battery pack, the voltage of the single cells in the battery pack, the internal resistance of the single cells, and the temperature of the single cells.

[0070] Based on the battery online capacity calibration device, this embodiment also provides a method for battery online capacity calibration. Figure 2 It is a schematic flow chart of a method for battery online capacity calibration provided by the embodiment of the present application. As Figure 2 shown, the method may include the following steps:

[0071] Step 101, start the capacity calibration process of the battery pack when the preset conditions are met, and control the battery pack to discharge to the DC bus at a constant current.

[0072] In the embodiment of the present application, when the time since the last capacity calibration exceeds the preset period and the state of the battery pack is normal, start the capacity calibration process of the battery pack.

[0073] Step 102, detect the DC bus voltage in real time, and dynamically adjust the discharge path according to the fluctuation range of the DC bus voltage to ensure that the DC bus voltage is within the preset stable range.

[0074] In the embodiment of the present application, referring to Figure 2 , when starting the capacity calibration process, the control module controls the battery to start discharging to the DC bus at a constant current, and dynamically adjusts the discharge path according to the fluctuation of the bus voltage, and according to the set hysteresis voltage , execute the following control strategy:

[0075] 1. When the voltage is too high: When the DC bus voltage is higher than the preset highest threshold When the voltage is in this range, the control module closes the second contactor and the third contactor, and controls the battery pack to not only discharge to the DC bus, but also feedback the excess electrical energy to the AC grid through the bidirectional AC / DC module, so as to reduce the bus voltage to within the stable range.

[0076] 2. When the voltage is close to the upper limit: When the DC bus voltage is in the range, keep the current discharge path unchanged, control the battery pack to continue to supply power to the DC bus, but do not feedback electrical energy to the AC grid, where is the hysteresis voltage.

[0077] 3. When the voltage is in the medium range: When the DC bus voltage is in the range, control the battery pack to only supply power to the load, keep the DC bus voltage within a reasonable range, and at the same time avoid feedbacking electrical energy to the AC grid.

[0078] 4. When the voltage is too low: When the DC bus voltage is lower than the preset minimum threshold , control the bidirectional AC / DC module to supply power from the AC grid to the DC bus, and supply power to the load together with the battery pack to compensate for the insufficient bus voltage and maintain stable output.

[0079] It can be understood that can be adjusted appropriately according to the actual operating conditions, which is related to the power of the load and the stability of the AC grid. If the device switches frequently, can be increased appropriately. And and can also be set according to the allowable fluctuation range of the bus. This application does not make specific limitations on this.

[0080] It should be noted that when the battery pack discharges, due to the change of the discharge path, the current relationship of each branch will also change. When the battery pack only supplies power to the load, , the current direction is as shown in Figure 4 ; when the DC bus voltage is relatively high, the battery pack supplies power to the load and the AC grid at the same time, , the current direction is as shown in Figure 5 ; when the DC bus voltage is relatively low, the battery and the AC grid jointly supply power to the load, , the current direction is as shown in Figure 6 .

[0081] Step 103, when the battery pack reaches the discharge capacity termination condition, control the battery pack to stop discharging.

[0082] In the embodiment of the present application, each single battery of the series-connected battery pack is connected in parallel with a contactor.

[0083] During the capacity test, the voltage of each single battery in the battery pack is monitored in real time. When the voltage of any single battery reaches the preset termination voltage, the contactor connected in parallel to this single battery is controlled to close, so as to avoid over-discharge of this battery and prevent premature termination of discharge due to battery imbalance.

[0084] Finally, when the voltages of all single batteries in the battery pack reach the preset termination voltage, the discharge process is stopped and the discharge ends.

[0085] Step 104, after the discharge ends, use the bidirectional AC / DC module to charge the battery pack from the AC grid with constant current and limited voltage until the battery pack reaches the fully charged state.

[0086] In the embodiment of the present application, after the battery completes the capacity test discharge, it enters the charging stage.

[0087] Refer to Figure 7 , first start the charging process, use the bidirectional AC / DC module to convert alternating current into direct current, and start charging the battery.

[0088] During the charging process, the system continuously monitors the charging status to ensure normal charging. If the charging status is normal, the system continues to charge; if the charging status is abnormal (such as overheating, overcurrent, etc.), the system will pause or exit the charging process to avoid damaging the battery.

[0089] Moreover, during the charging process, the system continuously checks whether the charging cut-off condition is met. If the charging cut-off condition is not reached, the system will continue to charge and cycle the detection. When it is detected that the charging meets the cut-off condition, the system stops the charging process, the charging process is completed, and the battery pack enters the floating charge or standby state.

[0090] In an embodiment of the present application, the charging cut-off conditions include that the charging voltage or current reaches the set threshold, the battery state reaches the preset fully charged state, etc., and the present application does not make specific limitations on this.

[0091] Based on the method proposed in the present application, during the discharge process of the battery, although the discharge path may be adjusted according to the fluctuation of the bus voltage, the output current always remains constant. This design ensures the continuity of the capacity test process, avoids capacity test interruption or repeated testing caused by current fluctuation, and thus improves the accuracy of the capacity test.

[0092] To verify the effect of the present application, the embodiment of the present application also designs a discharge test, and it is required that reaching 80% of the rated capacity is considered qualified.

[0093] The capacity detection of traditional batteries is usually carried out at a 10-hour rate. That is, if 80% full is used as the qualified judgment standard, it usually takes about 8 hours to complete the capacity detection at the traditional 10-hour rate. However, since the capacity detection method proposed in this application uses a 3-hour rate, that is, if 80% full is used as the qualified judgment standard, it only takes 2.4 hours to complete the capacity detection. Therefore, compared with the traditional method, the capacity detection method of this application significantly shortens the detection time and improves the detection efficiency, which can reflect the technical effect of shortening time.

[0094] To implement the above embodiments, the present application also provides an electronic device, including: a processor, and a memory communicatively connected to the processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory to implement the method provided in the foregoing embodiments.

[0095] To implement the above embodiments, the present application also provides a computer-readable storage medium storing computer-executable instructions, which are used to implement the method provided in the foregoing embodiments when executed by a processor.

[0096] To implement the above embodiments, the present application also provides a computer program product including a computer program, which implements the method provided in the foregoing embodiments when executed by a processor.

[0097] The collection, storage, use, processing, transmission, provision, and disclosure of the user's personal information involved in this application all comply with the provisions of relevant laws and regulations and do not violate public order and good customs.

[0098] It should be noted that personal information from users should be collected for legal and reasonable purposes and not shared or sold outside of these legal uses. In addition, such collection / sharing should be carried out after obtaining the informed consent of the user, including but not limited to notifying the user to read the user agreement / user notice and sign an agreement / authorization including authorizing relevant user information before the user uses the function. In addition, any necessary steps need to be taken to protect and safeguard access to such personal information data and ensure that others with access to personal information data comply with their privacy policies and procedures.

[0099] This application anticipates providing an implementation plan for users to selectively block the use or access of personal information data. That is, this disclosure anticipates providing hardware and / or software to prevent or block access to such personal information data. Once personal information data is no longer needed, the risk can be minimized by restricting data collection and deleting data. In addition, when applicable, personal identifiers are removed from such personal information to protect the privacy of users.

[0100] In the descriptions of the foregoing embodiments, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In 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, without contradiction, 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.

[0101] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0102] Any process or method description in a flowchart or described in other ways herein may be understood to represent a module, segment, or portion of code including one or more executable instructions for implementing a customized logic function or process, and the scope of the preferred embodiments of the present application includes additional implementations, where the functions may be executed in a substantially simultaneous manner or in a reverse order according to the functions involved, rather than in the order shown or discussed, which should be understood by those skilled in the art to which the embodiments of the present application pertain.

[0103] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a definite sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device), or used in combination with these instruction execution systems, apparatuses, or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection portion having one or more wirings (electronic device), a portable computer diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpretation, or otherwise processing as appropriate, and then stored in a computer memory.

[0104] It should be understood that various parts of the present application can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

[0105] Those of ordinary skill in the art of this technology can understand that all or part of the steps carried by the methods of the above embodiments can be completed by a program instructing relevant hardware, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiments.

[0106] In addition, each functional unit in various embodiments of the present application may be integrated into a processing module, may exist physically alone for each unit, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0107] The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disc, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present application.

[0108] It should be understood that various forms of the processes shown above can be used, steps can be reordered, added or deleted. For example, the steps described in the present application can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solution of the present application can be achieved, and no limitations are imposed herein.

[0109] The above specific implementation manners do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. An on-line capacity verification device for a storage battery, characterized in that, Comprising: A DC bus for providing a DC power supply to a load; At least one battery pack connected to the DC bus and used to supply power to the DC bus and the load during the nuclear capacity test process; A bidirectional AC / DC module connected to the battery pack and used to achieve bidirectional current conversion among an AC power grid, the battery pack, and the DC bus; A first contactor connected in series between the battery pack and the DC bus and used to control the connection and disconnection between the battery pack and the DC bus; A second contactor connected in series in the positive electrode circuit of the battery pack and used to control the connection between the battery pack and the bidirectional AC / DC module; A third contactor connected in series in the negative electrode circuit of the battery pack and used to control the connection between the bidirectional AC / DC module and the AC power grid; A control module connected to the first contactor, the second contactor, and the third contactor and used to control the opening and closing states of each contactor according to the voltage of the DC bus and the state of the battery pack, so as to dynamically adjust the discharge path of the battery pack; The control module is further used for: When the voltage of the DC bus is normal, controlling the first contactor to close, so that the battery pack supplies power to the load alone; When the voltage of the DC bus is higher than a set maximum threshold, controlling the second contactor and the third contactor to close, so that the battery pack supplies power to the DC bus and the AC power grid simultaneously; When the voltage of the DC bus is lower than a set minimum threshold, controlling the bidirectional AC / DC module to supplement electric energy to the DC bus from the AC power grid through the third contactor and supply power to the load together with the battery pack.

2. The device according to claim 1, wherein Further comprising: A battery monitoring module used to monitor the voltage of the DC bus, the discharge current of the battery pack, the voltage of single cells in the battery pack, the internal resistance of single cells, and the temperature of single cells.

3. An on-line capacity verification method for a storage battery, which is applied to the on-line capacity verification device for a storage battery described in any one of claims 1-2, and is characterized in that, Including the following steps: When preset conditions are met, starting the nuclear capacity test process of the battery pack and controlling the battery pack to discharge to the DC bus at a constant current; Real-time detecting the voltage of the DC bus and dynamically adjusting the discharge path according to the fluctuation range of the voltage of the DC bus to ensure that the voltage of the DC bus is within a preset stable range; When the battery pack reaches the discharge nuclear capacity termination condition, controlling the battery pack to stop discharging; After the discharge is completed, performing constant current and constant voltage charging on the battery pack from the AC power grid through the bidirectional AC / DC module until the battery pack reaches the charging completion state.

4. The method according to claim 3, characterized in that, The starting the nuclear capacity test process of the battery pack when preset conditions are met includes: When the time since the last nuclear capacity test exceeds a preset period and the state of the battery pack is normal, starting the nuclear capacity test process of the battery pack.

5. The method according to claim 4, characterized in that The real-time detecting the voltage of the DC bus and dynamically adjusting the discharge path according to the fluctuation range of the voltage of the DC bus to ensure that the voltage of the DC bus is within a preset stable range includes: When the DC bus voltage is higher than a preset maximum threshold control the battery pack to discharge to the DC bus, and feed back the excess electric energy to the AC power grid through the bidirectional AC / DC module; When the DC bus voltage is within the range, keep the current discharge path unchanged, control the battery pack to continue supplying power to the DC bus, but not feed back electric energy to the AC grid, where is the hysteresis voltage; When the DC bus voltage is within the range, control the battery pack to only supply power to the load; When the DC bus voltage is lower than a preset minimum threshold control the bidirectional AC / DC module to supply power from the AC grid to the DC bus, and jointly supply power to the load with the battery pack.

6. The method according to claim 5, characterized in that, The controlling the battery pack to stop discharging when the battery pack reaches the discharge nuclear capacity termination condition includes: During the capacity testing process, the voltage of each single battery in the battery pack is monitored in real time. When the voltage of any single battery reaches the preset termination voltage, the contactor connected in parallel to this single battery is controlled to close to prevent this battery from over-discharging; When the voltages of all single batteries in the battery pack reach the preset termination voltage, the discharging process is stopped and the discharging is ended.

7. The method according to claim 6, wherein The constant current and voltage-limited charging from the AC power grid to the battery pack through the bidirectional AC / DC module until the battery pack reaches the fully charged state includes: Using the bidirectional AC / DC module to convert AC power into DC power to start charging the battery pack; During the charging process, continuously monitor the charging state of the battery pack. If the charging state is abnormal, pause or exit the charging process; If the charging state is normal, check whether the battery pack meets the charging cut-off condition. When it is detected that the charging cut-off condition is met, stop the charging process and the charging process is completed.

8. An electronic device, characterized in that, Including: A processor and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method according to any one of claims 3-7.

9. A computer-readable storage medium, characterized in that, Computer-executable instructions are stored in the computer-readable storage medium, and when the computer-executable instructions are executed by a processor, they are used to implement the method according to any one of claims 3-7.

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